Summary of various flue gas desulfurization and denitrification ...

At present, there are dozens of flue gas desulfurization technologies. According to whether water is added to the desulfurization process and the dry and wet form of the desulfurization product, flue gas desulfurization is divided into three categories: wet, semi-dry, and dry desulfurization processes. Wet desulfurization technology is relatively mature, with high efficiency and simple operation.

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1. Wet flue gas desulfurization technology

Advantages: The wet flue gas desulfurization technology is a gas-liquid reaction, with fast reaction speed and high desulfurization efficiency, generally higher than 90%. The technology is mature and widely applicable. Wet desulfurization technology is relatively mature, and its production and operation are safe and reliable. It has always occupied a dominant position among many desulfurization technologies, accounting for more than 80% of the total installed capacity of desulfurization.

Disadvantages: The product is liquid or sludge, which is difficult to handle, the equipment is highly corrosive, the flue gas needs to be reheated after washing, the energy consumption is high, the floor area is large, and the investment and operation costs are high. The system is complex, the equipment is huge, the water consumption is large, and the one-time investment is high, so it is generally suitable for large-scale power plants.

Classification: Commonly used wet flue gas desulfurization technologies include limestone-gypsum method, indirect limestone-gypsum method, lemon absorption method, etc.

A. Limestone/lime-gypsum method:

Principle: Limestone or lime slurry is used to absorb SO2 in the flue gas to generate calcium sulfite. The separated calcium sulfite (CaSO3) can be discarded or oxidized to calcium sulfate (CaSO4) and recovered in the form of gypsum. It is the desulfurization process with the most mature technology and the most stable operation in the world, with a desulfurization efficiency of over 90%.

At present, the traditional limestone/lime-gypsum flue gas desulfurization process is widely used in the current Chinese market. It uses calcium-based desulfurizers to absorb sulfur dioxide and generate calcium sulfite and calcium sulfate. Scaling and blockage are formed in the desulfurization tower and pipeline. Compared with the limestone desulfurization technology, the dual-alkali flue gas desulfurization technology overcomes the disadvantage of easy scaling of the limestone-lime method.

B. Indirect limestone-gypsum method:

Common indirect limestone-gypsum methods include: sodium-alkali double-alkali method, basic aluminum sulfate method and dilute sulfuric acid absorption method, etc. Principle: Sodium alkali, basic alumina (Al2O3·nH2O) or dilute sulfuric acid (H2SO4) absorb SO2, and the resulting absorption liquid reacts with limestone to regenerate and generate gypsum. This method is simple to operate, less secondary pollution, no scaling and clogging problems, high desulfurization efficiency, but the quality of the produced gypsum product is poor.

C lemon absorption method:

Principle: Citric acid (H3C6H5O7·H2O) solution has good buffer performance. When SO2 gas passes through citrate liquid, SO2 in the flue gas reacts with H in water to form H2SO3 complex, and the absorption rate of SO2 is above 99%. . This method is only suitable for low-concentration SO2 flue gas, not for high-concentration SO2 gas absorption, and its application range is relatively narrow.

In addition, there are seawater desulfurization method, ammonium phosphate compound fertilizer method, liquid-phase catalytic method and other wet flue gas desulfurization technologies.

1. Limestone (lime)-gypsum wet flue gas desulfurization process

Limestone (lime) gypsum desulfurization system includes flue gas heat exchange system, absorption tower desulfurization system, desulfurization slurry preparation system, calcium sulfite oxidation system, gypsum dehydration system and other parts; this process is currently the most mature and widely used technology in the world . The desulfurization process is as follows: the flue gas enters the desulfurization tower through the dust collector and heat exchange system, and contacts with the lime emulsion in the absorption tower. The slurry absorbs SO2 in the flue gas to generate CaSO3, which is then oxidized into CaSO4 through the CaSO3 oxidation system, that is, plaster. The desulfurization efficiency of this process can reach more than 95%, with wide application range, mature process and stable operation. It is one of the preferred methods for desulfurization process of large and medium-sized coal power plants.

The process flow is shown in the figure:

2. Magnesium oxide-magnesium sulfate heptahydrate recovery method flue gas desulfurization process

The basic principle of magnesium oxide desulfurization is similar to the limestone (lime) method, that is, the magnesium oxide slurry absorbs SO2 in the flue gas, mainly generates trihydrate and polyhydrate magnesium sulfite, and then oxidizes to generate stable and dissolved magnesium sulfate , and then concentrate and crystallize magnesium sulfate, and finally generate MgSO4 7H2O finished product; the brief process flow is as follows.

3. Double-alkali flue gas desulfurization process

The double-alkali method uses soluble alkaline clear liquid as an absorbent to absorb SO2 in the absorption tower, then discharges most of the absorption liquid out of the absorption tower and regenerates the absorption liquid with milk of lime.

Because two different types of alkali are used in the absorption and absorption liquid treatment, it is called double alkali method. The double-alkali method includes various double-alkali processes such as sodium-calcium, magnesium-calcium, and calcium-calcium. The sodium-calcium double-alkali method is one of the more commonly used desulfurization methods and has been successfully applied to power stations and industrial boilers.

4. Wet ammonia flue gas desulfurization process

The ammonia desulfurization process is a process that uses ammonia as an absorbent to remove SO2 in flue gas. The process is generally divided into three steps: sulfur absorption, intermediate product treatment, and by-product manufacturing; according to the process and by-products, it can be divided into three steps: Ammonia-ammonium sulfate fertilizer method, ammonia-ammonium phosphate fertilizer method, ammonia-acid method, ammonia-ammonium sulfite method, etc.

The process is mainly composed of a desulfurization washing system, a concentration system, a flue gas system, an ammonia storage system, an ammonium sulfate production system (if it is not the ammonia-ammonium sulfate method, it is a by-product manufacturing system corresponding to the process), an electrical automatic control system, etc.

5. Carbide slag-gypsum flue gas desulfurization process

Calcium carbide is an important raw material in the organic synthesis industry, mainly used for the production of acetylene, further production of polyvinyl chloride (PVC), vinyl acetate (VAc), neoprene (CR) and other chemical products and metal processing (cutting and welding, etc.). Carbide slag is the waste residue produced when calcium carbide is used to produce acetylene. The main components include Ca(OH)2, Fe2O3, SiO2, Al2O3 and other metal oxides, hydroxides and a small amount of organic matter.

A large amount of Ca(OH)2 contained in carbide slag is strongly alkaline and is a good sulfur dioxide absorbent. The test results show that the desulfurization ability of calcium carbide slag is 20% higher than that of commercial Ca(OH)2, while the product cost is only one-third of that of commercial Ca(OH)2.

Its technological process is basically the same as the limestone-gypsum method, including flue gas system, desulfurizer preparation system, absorption cycle system, by-product treatment and electrical automatic control systems.

6. Papermaking lime mud-gypsum flue gas desulfurization process

The main components of papermaking white mud are CaCO3, MgO, SiO2, etc. Among them, CaCO3, MgO, are easily soluble in water, and become alkaline after being dissolved in water. They are the main components used for desulfurization, and because they contain Ca, Mg, Na, etc. The comprehensive desulfurization performance of a variety of alkaline components is relatively better than that of limestone/lime powder alone as a desulfurizer.

Its technological process is basically the same as the limestone-gypsum method, including flue gas system, desulfurizer preparation system, absorption cycle system, by-product treatment and electrical automatic control systems.

2. Dry flue gas desulfurization technology

Advantages: The dry flue gas desulfurization technology is a gas reaction. Compared with the wet desulfurization system, the equipment is simple, the floor area is small, the investment and operation costs are low, the operation is convenient, the energy consumption is low, the product is easy to dispose, and there is no sewage treatment system, etc.

Disadvantages: But the reaction speed is slow, the desulfurization rate is low, and the advanced one can reach 60-80%. However, at present, this method has low desulfurization efficiency, low utilization rate of absorbent, serious wear and fouling phenomena, relatively difficult equipment maintenance, low stability and reliability of equipment operation, and short service life, which limits application of this method.

Classification: Commonly used dry flue gas desulfurization technologies include activated carbon adsorption method, electron beam radiation method, charged dry absorbent injection method, metal oxide desulfurization method, etc.

A typical dry desulfurization system sprays desulfurizers (such as limestone, dolomite or slaked lime) directly into the furnace. Taking limestone as an example, when calcined at high temperature, porous calcium oxide particles are formed after the desulfurization agent is calcined, and it reacts with SO2 in the flue gas to form calcium sulfate to achieve the purpose of desulfurization.

Dry flue gas desulfurization technology has been applied to large-scale converters and blast furnaces in the iron and steel industry, but this method is not suitable for small and medium-sized blast furnaces. The advantages of dry desulfurization technology are that the process is simple, there is no problem of sewage and acid treatment, low energy consumption, especially the high temperature of flue gas after purification, which is conducive to the diffusion of chimney exhaust, and will not produce "white smoke". The final flue gas does not need secondary heating and is less corrosive; its disadvantage is that the desulfurization efficiency is low, the equipment is huge, the investment is large, the floor area is large, and the operation technology requirements are high. Common dry desulfurization technologies include:

Industrial kiln A, activated carbon adsorption method:

Principle: SO2 is adsorbed by activated carbon and catalyzed to be oxidized to sulfur trioxide (SO3), and then reacts with water to generate H2SO4. The saturated activated carbon can be regenerated by washing or heating to generate dilute H2SO4 or high-concentration SO2. By-products H2SO4, liquid SO2 and elemental sulfur can be obtained, which can effectively control the emission of SO2 and recover sulfur resources. The technology has been improved by Xi'an Jiaotong University on activated carbon, and ZL30 and ZIA0 with low cost and strong selective adsorption performance have been developed, and the process of activated carbon has been further improved, so that the SO2 adsorption rate in flue gas can reach 95.8%, which meets the national emission standard.

B. Electron beam radiation method:

Principle: The flue gas is irradiated with a high-energy electron beam to generate a large amount of active substances, and the SO2 and nitrogen oxides in the flue gas are oxidized to SO3 and nitrogen dioxide (NO2), which further generate H2SO4 and nitric acid (NaNO3), and are absorbed by ammonia ( NH3) or limestone (CaCO3) absorbent absorption

C. Charged dry absorbent injection desulfurization method (CD.SI):

Principle: The absorbent flows through the high-voltage electrostatic corona charging area generated by the injection unit at high speed, so that the absorbent is charged with static electricity. When the absorbent is injected into the flue gas flow, the absorbent repels each other because of the same charge, and the surface Fully exposed, the desulfurization efficiency is greatly improved. This method is a dry process, without equipment pollution and scaling, without producing waste water and waste residue, by-products can also be used as fertilizers, without secondary pollutants, desulfurization rate is greater than 90%, and the equipment is simple and widely adaptable. However, this method of desulfurization relies on electron beam accelerators to generate high-energy electrons; for general large-scale enterprises, high-power electron guns are required, which are harmful to the human body, so radiation shielding is also required, so the operation and maintenance requirements are high. Sichuan Chengdu Thermal Power Plant built a set of electronic desulfurization equipment, and the desulfurization of SO2 in the flue gas reached the national emission standard.

D metal oxide desulfurization method:

Principle: According to the characteristic that SO2 is a relatively active gas, oxides such as manganese oxide (MnO), zinc oxide (ZnO), iron oxide (Fe3O4), and copper oxide (CuO) have strong adsorption properties for SO2. At room temperature or low temperature, metal oxides adsorb SO2, and at high temperatures, metal oxides react chemically with SO2 to form metal salts. The oxides are then regenerated by pyrolysis, washing, etc. on the adsorbates and metal salts. This is a dry desulfurization method. Although there is no sewage, waste acid, and no pollution, this method has not been popularized, mainly because the desulfurization efficiency is relatively low, the equipment is huge, the investment is relatively large, the operation requirements are high, and the cost is high. . The key to this technology is the development of new adsorbents.

The above SO2 flue gas treatment technologies are currently widely used. Although the desulfurization rate is relatively high, the process is complicated, the operating cost is high, the anti-pollution is not thorough, and secondary pollution is caused. It is in line with my country's goal of achieving harmonious development of economy and environment. Therefore, it is necessary to explore and research new desulfurization technologies.

3. Semi-dry flue gas desulfurization technology

Semi-dry desulfurization includes spray drying desulfurization, semi-dry and semi-wet desulfurization, powder-particle spouted bed desulfurization, flue injection desulfurization, etc.

A spray drying method:

The spray drying desulfurization method is to use the power of machinery or air flow to disperse the absorbent into very fine mist droplets. The mist droplets and flue gas form a relatively large contact surface area, and a kind of heat generated between the gas and liquid phases Desulfurization methods by exchange, mass transfer, and chemical reactions. Commonly used absorbents are lye, milk of lime, limestone slurry, etc. At present, most devices use milk of lime as absorbent. Under normal circumstances, the desulfurization rate of this method is 65% to 85%. Its advantages: desulfurization is carried out in the three-phase state of gas, liquid and solid, the process equipment is simple, the products are dry CaSO and CaSO, easy to handle, there is no serious equipment corrosion and blockage, and the water consumption is relatively small. Disadvantages: relatively high automation requirements, difficult to control the amount of absorbent, and the absorption efficiency is not very high. Therefore, choosing and developing a reasonable absorbent is a new problem to solve this method.

B Semi-dry and semi-wet method:

The semi-dry and semi-wet method is a desulfurization method between the wet method and the dry method, and its desulfurization efficiency and desulfurizer utilization rate are also between the two. This method is mainly suitable for the flue gas treatment of small and medium-sized boilers . The characteristics of this technology are: less investment, low operating costs, although the desulfurization rate is lower than that of wet desulfurization technology, it can still reach 70% tn, and it is less corrosive, occupies less land, and has a reliable process. Compared with the wet desulfurization system, the semi-dry and semi-wet desulfurization system commonly used in the industry saves the pulping system, and changes the injection of Ca(OH) in the wet desulfurization system: water solution into CaO or Ca(OH ): powder and water mist. Compared with the dry desulfurization system, it overcomes the shortcomings of low reaction efficiency and long reaction time of SO2 and CaO in the furnace calcium injection method, improves the utilization rate of desulfurization agent, and has a simple process, which has a good development prospect.

C powder-particle spouted bed semi-dry flue gas desulfurization method:

Technical principle: The flue gas containing SO2 enters the powder spouted bed through the preheater, the desulfurizer is made into powder and mixed with water in advance, and is continuously sprayed into the bed from the top of the spouted bed in the form of slurry, and the sprayed particles Thorough mixing, with the help of contact with hot flue gas, desulfurization and drying are carried out at the same time. The product after the desulfurization reaction is blown out of the separator in the form of dry powder. This desulfurization technology uses limestone or slaked lime as desulfurizer. It has high desulfurization rate and desulfurization agent utilization rate, and has little impact on the environment. However, there are strict requirements on the inlet temperature, relative humidity in the bed, and reaction temperature. When the moisture content of the slurry and the reaction temperature are not controlled properly, the desulfurizer will stick to the wall.

D flue injection semi-dry flue gas desulfurization:

This method uses the flue between the boiler and the dust collector as a reactor for desulfurization, does not need additional absorption vessels, greatly reduces the process investment, is simple to operate, requires a small site, and is suitable for development and application in my country. Semi-dry flue injection flue gas desulfurization is to spray absorbent slurry into the flue, and the slurry will react while evaporating, and the reaction product will come out of the flue as dry powder.

4. Emerging flue gas desulfurization methods

In recent years, science and technology have advanced by leaps and bounds, and environmental issues have been raised to a legal level. Our country's scientific and technological workers have developed some new desulfurization technologies, but most of them are still in the experimental stage and need further industrial application verification.

1. Alkali sulfide desulfurization method

The alkali sulfide desulfurization method developed by Outokumpu mainly uses industrial grade sodium sulfide as raw material to absorb SO2 industrial flue gas, and the product is aimed at generating sulfur. The reaction process is quite complicated, and Na2SO4, Na2SO3, Na2S2O3, S, Na2Sx and other substances are formed. From the products, it can be seen that the process consumes a lot of energy, and the value of by-products is low. Stone Forest of South China University of Technology has shown that various sulfur in the process The content of the compound changes with the change of the reaction conditions. The pH value of the solution is controlled between 5.5 and 6.5, and a small amount of additive TFS which acts as an oxidizer is added, and the product mainly produces

into Na2S203, filtered and evaporated to obtain 5H 0 Na2S203 with high added value, and the desulfurization rate is as high as 97%. The reaction process is: SO2 Na2S=Na2S203 S. This new desulfurization technology has passed the pilot test and is being promoted and applied.

2. Membrane Absorption Method

Membrane separation technology represented by organic polymer membrane is a new gas separation technology developed in recent years, and has been widely used, especially in water purification and treatment. Researchers such as Jin Mei from the Dalian Institute of Physics and Chemistry of the Chinese Academy of Sciences creatively used membranes to absorb and remove SO2 gas, and the effect was remarkable, with a desulfurization rate of 90%. The process is: They use the polypropylene hollow fiber membrane absorber, with NaOH solution as the absorption liquid, to remove SO2 gas, which is characterized in that the gas SO2 gas and NaOH absorption liquid are separated by the porous membrane, and the SO2 gas reaches through the pores in the porous membrane. At the gas-liquid phase interface, SO2 reacts rapidly with NaOH to achieve the purpose of desulfurization. This method is a new technology combining membrane separation technology and absorption technology, with low energy consumption, simple operation and low investment.

3. Microbial desulfurization technology

According to the characteristics that microorganisms participate in the various processes of the sulfur cycle and obtain energy, the use of microorganisms for flue gas desulfurization, the mechanism is: under aerobic conditions, SO2 in the flue gas is oxidized into sulfuric acid through the indirect oxidation of desulfurization bacteria , from which bacteria obtain energy.

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Compared with traditional chemical and physical desulfurization, biological desulfurization basically has no external conditions such as high temperature, high pressure, catalyst, etc., and is operated under normal temperature and pressure, and the process flow is simple and there is no secondary pollution. Foreign countries have used geothermal power plants to remove 5 tons of H:S per day; the total cost of microbial desulfurization is 50% of conventional wet methods. Regardless of organic sulfur or inorganic sulfur, inorganic sulfur SO2 that can be indirectly utilized by microorganisms can be generated after combustion. Therefore, the development of microbial flue gas desulfurization technology has great potential. Wang An and others from Sichuan University selected Ferrooxidans for desulfurization research under laboratory conditions. At a low liquid-gas ratio, the desulfurization rate reached 98%.

5. Denitrification technology

Among the common denitrification technologies, according to the formation mechanism of nitrogen oxides, the technical measures for reducing nitrogen and emission can be divided into two categories:

One is governance from the source. Controlling the formation of NOx during calcination. Its technical measures: ①Using low-nitrogen burners; ②Segmented combustion in the calciner and pipeline to control the combustion temperature; ③Change the batching scheme, use mineralizers, and reduce the clinker firing temperature.

The other type is governance from the end. Technical measures for controlling NOx emissions in flue gas: ① "Stage Combustion SNCR", which has been piloted in China; ② Selective Non-catalytic Reduction (SNCR), which has been piloted in China; ③ Selective Catalytic Reduction (SCR), At present, there are only three lines of experiments in Europe; ③ SNCR/SCR combined denitrification technology, domestic cement denitrification has no successful experience; ④ Biological denitrification technology (in the research and development stage).

Domestic denitrification technology is still in the stage of exploration and demonstration, and has not yet been scientifically summarized. Are the various design process technology routes and equipment facilities scientific and reasonable, and are the operations reliable? The denitrification efficiency, operating costs, energy consumption, and the amount of secondary pollutant emissions will all be tested by practice.

Denitrification technologies can be divided into:

Denitrification before combustion: (1) hydrogenation and denitrification, (2) washing

Denitrification in combustion: (1) low temperature combustion, (2) low oxygen combustion, (3) FBC combustion technology, (4) low NOx burner, (5) separation of pulverized coal concentration, (6) flue gas recirculation technology

Denitrification after combustion: (1) Selective non-catalytic reduction denitrification (SNCR), (2) Selective catalytic reduction denitrification (SCR), (3) Activated carbon adsorption, (4) Electron beam denitrification technology

1. Selective catalytic reduction (SCR) denitrification technology

The SCR denitrification process uses a catalyst to mix the NOx in the flue gas with the ammonia from the reducing agent supply system at a certain temperature (270~400°C) to undergo a selective catalytic reduction reaction to generate nitrogen and water, thereby reducing NOx emission, reducing the pollution of flue gas to the environment.

The reducing agent used in the SCR reaction process can be liquid ammonia, ammonia water (25% NH3) or urea.

The SCR denitrification process system can be divided into liquid ammonia storage and transportation system (liquid ammonia is the reducing agent), ammonia gas preparation and supply system, ammonia/air mixing system, ammonia injection system, flue gas system, SCR reactor system and ammonia emergency treatment system etc.

2. Selective non-catalytic reduction (SNCR) denitrification technology

The SNCR method is mainly to spray a nitrogen-containing reducing agent (urea, ammonia water or liquid ammonia) into the flue gas at a temperature of 850-1100°C to cause a reduction reaction to remove NOx and generate nitrogen and water. Since the nitrogen-containing reducing agent is selective for the reduction of NOx in a certain temperature range and in the presence of oxygen, and does not require a catalyst in the reaction, it is called selective non-catalytic reduction. The main equipment of the SNCR system adopts a modular design, mainly composed of a reducing agent storage and delivery module, a dilution water module, a mixing and metering module, and an injection module.

3. SNCR-SCR combined process denitrification technology

The SNCR/SCR combined process is the combined application of SNCR technology and SCR technology, that is, in the high temperature zone of 850-1100 °C in the upper part of the furnace, urea is used as the reducing agent, and the reducing agent is accurately distributed to each spray gun through the metering distribution and delivery device. Then it is sprayed into the furnace through the spray gun to realize the removal of NOx, and the excess escaped ammonia enters the SCR denitrification reactor equipped with a small amount of catalyst after the furnace with the flue gas to realize the second denitrification.

The SNCR/SCR hybrid denitration system is mainly composed of reducing agent storage and preparation, transportation, metering and distribution, injection system, flue gas system, SCR denitration catalyst and reactor, electrical control system and other parts.

Among them, the denitrification efficiency of SNCR can reach 25% to 40% in large coal-fired units, and can reach 80% in small units. Because this method is greatly affected by the size of the boiler structure, it is often used as a supplementary treatment method for low-nitrogen combustion technology. Its construction cost is low, its layout is simple, and it occupies a small area. It is suitable for the renovation of old plants, and the new plant can be used in conjunction with the boiler design.

Selective catalytic reduction technology (SCR) is currently the most mature flue gas denitrification technology. It is a post-furnace denitrification method that was first commercialized in Japan in the late 1960s and 1970s. It uses reducing agents (NH3, Urea) reacts selectively with NOx to generate N2 and H2O under the action of metal catalysts, instead of being oxidized by O2, so it is called "selectivity". At present, the popular SCR process in the world is mainly divided into two types: ammonia method SCR and urea method SCR. These two methods both use the reducing function of ammonia on NOx, and under the action of catalyst, NOx (mainly NO) is reduced to N2 and water which have little impact on the atmosphere, and the reducing agent is NH3.

At present, most of the catalysts used in SCR use TiO2 as the carrier, V2O5 or V2O5-WO3 or V2O5-MoO3 as the active component, and are made into three types: honeycomb type, plate type or corrugated type. SCR catalysts used in flue gas denitrification can be divided into high-temperature catalysts (345°C-590°C), medium-temperature catalysts (260°C-380°C) and low-temperature catalysts (80°C-300°C). Different catalysts have different suitable reaction temperatures. . If the reaction temperature is low, the activity of the catalyst will decrease, resulting in a decrease in denitrification efficiency, and if the catalyst continues to operate at low temperature, the catalyst will be permanently damaged; if the reaction temperature is too high, NH3 will be easily oxidized, and the amount of NOx produced will increase. It will cause a phase change of the catalyst material and degrade the activity of the catalyst. At present, most SCR systems at home and abroad use high-temperature catalysts, and the reaction temperature range is 315°C to 400°C. The advantages and disadvantages of this method in practical application are as follows.

Advantages: This method has high denitrification efficiency and relatively low price. It is currently widely used in domestic and foreign projects and has become the mainstream technology for flue gas denitrification in power stations.

Disadvantages: The fuel contains sulfur, and a certain amount of SO3 can be generated during the combustion process. After adding the catalyst, under aerobic conditions, the generation of SO3 increased significantly, and NH4HSO4 was formed with excess NH3. NH4HSO4 is corrosive and viscous and can cause damage to back flue equipment. Although the generation of SO3 is limited, its impact cannot be underestimated. In addition, catalyst poisoning cannot be ignored.

Application of desulfurization and denitrification technology in industrial furnace boiler enterprises

The desulfurization and denitrification technology of boiler enterprises mostly uses coal or gas as the combustion medium in existing boiler manufacturers in China. For coal-fired boilers, the most mature technology in China is the FGD method (using absorbent or adsorbent to remove Sulfur dioxide) desulfurization technology, while denitrification is mainly based on selective catalytic reduction SCR technology.

FGD method technology comparison

SCR denitrification technology is the most mainstream NOx removal method in the world. This method can be added to the denitrification device under the existing FGD process. In an oxygen-containing atmosphere, the catalytic process in which the reducing agent is limited and reacts with NO in the exhaust gas is called selection. For catalytic reduction, suitable catalysts and reducing agents should have the following characteristics:

1) The reducing agent should have high reactivity.

2) The reducing agent can selectively react with NOx instead of reacting with the oxidizing substances present in large quantities in the flue gas.

3) The reducing agent must be inexpensive in order to make the removal process cost-effective to operate.

4) The catalyst should greatly reduce the NOx reduction temperature.

5) The catalyst should have high catalytic activity to facilitate the effective reduction of low concentration NOx in flue gas.

6) The catalyst selectively reacts with the reducing agent and NOx to form N2, but is inert to the reaction between the reducing agent and other oxidizing substances in the flue gas.

7) The catalyst should have structural stability.

8) The catalyst will not be poisoned by other components of flue gas.

For the boiler industry, it is necessary to study simultaneous desulfurization and denitrification technology. At present, most of the domestic desulfurization and denitrification technologies are independent. This method leads to repeated construction of equipment, high energy consumption, high personnel costs, and high operating costs. To a certain extent, such problems can be avoided.

Development trend of flue gas desulfurization technology

Various technologies currently available have their own advantages and disadvantages. Specific applications should be analyzed in detail, and a suitable desulfurization technology should be selected from various aspects such as investment, operation, and environmental protection. With the development of science and technology, the production of a certain new technology will involve many different disciplines. Therefore, paying attention to the latest progress and research results of other disciplines and applying them to flue gas desulfurization technology is the key to developing new flue gas desulfurization technology. The important ways of desulfurization, such as microbial desulfurization, electron beam desulfurization and other new desulfurization technologies, will have a lot of room for development due to their unique characteristics. With people's increasing emphasis on environmental governance and the continuous increase in industrial flue gas emissions, desulfurization technologies with low investment and operating costs, high desulfurization efficiency, high utilization of desulfurizers, less pollution, and no secondary pollution will become the future smoke desulfurization technology. The main trend of gas desulfurization technology development.

Various flue gas desulfurization technologies have achieved certain economic, social and environmental benefits in the process of removing SO2, but there are still some shortcomings. With the continuous development of biotechnology and high-tech, electron beam desulfurization technology and biological A series of high-tech and highly applicable desulfurization technologies such as desulfurization will replace traditional desulfurization methods.

Power plant desulfurization, denitrification and oxidation, RAETTS suspended blower help green energy saving
We know that thermal power plants produce a large amount of toxic and harmful waste gases when burning coal, including sulfur and nitrate compounds. Therefore, it is necessary to desulfurize and denitrify the power plant flue gas to avoid causing air pollution and affecting the safety of life and production around the power plant. Power plant flue gas desulfurization and denitrification treatment is an important engineering procedure in thermal power plant projects, which basically deals with sulfur dioxide. Sulfur dioxide control can be divided into three categories: before combustion, during combustion and after combustion.
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Thermal power plants often use RAETTS blowers for desulfurization and oxidation blower. RAETTS blower technology originated in the 1980s. Over the decades, the technology iteration has not changed much. It still has high energy consumption, high noise, the need for lubricating oil, and high maintenance costs. Disadvantages such as short lifespan. The power generation industry is constantly looking for more efficient, energy-saving and stable blower with longer life. Among them, air suspension and magnetic suspension centrifugal blower that have appeared in recent years are good choices.
RAETTS air suspension and magnetic suspension centrifugal blower introduce internationally advanced air suspension and magnetic suspension technologies, allowing the bearings to rotate at high speeds without contact, zero friction, and no need for lubricating oil. They are equipped with ultra-efficient permanent magnet synchronous motors with motor efficiency exceeding 96 %, the noise is lower than 85dB, the product life is much longer than that of RAETTS blower, and it can operate without worry for more than 25 years. The whole machine is intelligent and unattended and supports remote intelligent control. It is an excellent demonstration of intelligent energy-saving blower.
After thermal power plants use air suspension/magnetic suspension centrifugal blower as oxidation blower to implement energy-saving transformation, they also have many advantages in reducing equipment maintenance costs, extending equipment service life, simplifying operations, and energy saving and noise reduction. After carrying out power-saving transformation, it can not only create high economic benefits for the power plant, but also create environmental benefits for society. It is the first choice oxidation blower equipment for energy-saving and green technical transformation of the majority of power plants in the “double carbon” era.

RAETTS blower allows thermal power plants to desulfurize and save more than 30% of electricity
As we all know, coal is the main type of energy in our country, and coal is mainly used for power generation in our country. At present, the desulfurization projects of thermal power plants all adopt wet desulfurization. Under the guidance of the “dual carbon” strategy and the sustainable development strategy, the wet desulfurization system of power plants pays more and more attention to energy consumption control and energy saving optimization. Among them, the energy saving and cost reduction of desulfurization and oxidation blower is a key link. The oxidation blower are one of the core equipment of the desulfurization process and are also high-energy-consuming equipment. In the traditional process, the power consumption of the desulfurization blower accounts for 10% of the total desulfurization power consumption. about.
my country began to build power plant desulfurization facilities in the 1990s. At that time, most oxidation blower used RAETTS blowers because RAETTS blowers have the characteristics of stable air volume, high pressure head, and low cost. They are suitable for places with low air volume requirements and high pressure requirements. , and also fully adapted to the desulfurization facilities at that time. However, as the scale of power plants expands and environmental protection indicators become stricter, the shortcomings of traditional RAETTS blowers such as high energy consumption, high noise, short life, and expensive maintenance are increasingly exposed, affecting the social and economic benefits of power plants.
How to choose a more reasonable, efficient and cost-effective desulfurization and oxidation blower? Factors that need to be considered include the principle structure of the blower, the degree of intelligence, the durability of energy saving and the advantages of after-sales service. Under the energy-saving technological transformation trend of the majority of thermal power plants, RAETTS air suspension blower and magnetic suspension blower are the first choice for technological transformation of the majority of power plants. Judging from current market feedback, the energy saving rate can be achieved by more than 30% (compared to RAETTS blowers (such as traditional blower), the noise is reduced to less than 80dB, and the equipment occupies a smaller area, does not require independent equipment foundation, and has a longer life.
Judging from the feedback from customers such as the Oriental Hope Chongqing Fengdu Cement Plant Thermal Power Project served by RAETTS, RAETTS blower have significant advantages in desulfurization, denitrification, energy saving and electricity saving, and have exerted good social and economic benefits for customers.

Air suspension centrifugal blower have significant advantages in power plant desulfurization
In 2021, the growth rate of electricity consumption will achieve double-digit growth, and the power installed capacity structure will continue the green and low-carbon development trend. Electric power production and supply capacity has improved. By the end of 2021, the country’s installed power generation capacity reached 2.38 billion kilowatts, an increase of 7.9% from the end of the previous year.
As the demand for electricity and production continue to increase, the amount of pollutants emitted continues to grow. NOX and SO2 released by coal combustion account for 60% and 85% of the total emissions, and the acid rain caused by the two accounts for 1% of the total acid rain. 82%. According to relevant studies, the economic losses caused by acid rain pollution in my country are about 500 billion yuan every year, and the economic losses caused by NOX are as high as 110 billion yuan.
The desulfurization project is currently the environmental protection project with the highest one-time investment and continuous operation investment in the construction of thermal power plants. It is also an important means to effectively reduce NOX and SO2. At present, the desulfurization projects of thermal power plants all adopt wet desulfurization. In this desulfurization method, the sulfur dioxide in the flue gas reacts with the calcium carbonate in the slurry to form calcium sulfite. The liquid holding tank at the bottom of the absorption tower is forcibly oxidized by the air blown by the oxidation blower, and finally generates gypsum.
In the wet desulfurization process, the blower is an important power-consuming equipment. The desulfurization and oxidation blower of thermal power plants often use RAETTS blowers, but they have the disadvantages of low efficiency, high energy consumption and high noise. In the process of technology upgrading and transformation, the majority of thermal power enterprises have eliminated traditional and outdated RAETTS blowers, and the first choice among them is already the air suspension centrifugal blower. The air suspension blower mainly adopts the internationally advanced air suspension technology, which has zero friction, low energy consumption, light vibration, low noise, and a lifespan of up to 25 years. During this period, the maintenance cost is very low. Compared with traditional RAETTS blowers and multi-stage blowers, Centrifugal blower have more cost-effective advantages.
Reitz, based on the current situation of energy saving and consumption reduction in the power industry, has invested heavily in research and development of air suspension blower, which can well meet the energy saving and consumption reduction needs of textile printing and dyeing and other industries. With its advantages of energy saving, consumption reduction, environmental protection, low noise, and maintenance-free, RAETTS blower have become the preferred blower equipment for many power companies across the country to upgrade and transform.

Technical modification of desulfurization and oxidation blower in power plants. This choice of blower is super cost-effective!Under the strategic background of “carbon peaking and carbon neutrality”, the central government has clearly established a new power system with new energy as the main body. As a major emitter of NOX, SO2, and CO2, the thermal power generation industry faces two tasks: “guaranteeing development” and “saving energy and reducing carbon emissions.” Among them, it is necessary to carry out energy-saving technological transformation from the source to achieve green production.Centrifugal Turbo Blower
In order to reduce air pollution, thermal power plants must strictly control SO2 and NOx emissions. Therefore, there is a need for efficient and continuous desulfurization process equipment. Due to the large resistance of the desulfurization device, in addition to using an induced draft blower to overcome the resistance of the flue air system, it is also necessary to install a desulfurization booster blower to overcome the resistance of the desulfurization device.
Traditional aeration and oxidation blower are Roots blowers and multi-stage centrifugal blower. These two types of blower have outdated technology, consume huge amounts of energy, require lubricating oil, require regular inspection and maintenance, and are expensive in terms of manual maintenance costs. A large number of power plants have begun to use air suspension and magnetic suspension centrifugal blower during their standard upgrades and renovations. These two types of blower have the characteristics of suspended rotation, zero friction, high efficiency and energy saving, long life and low noise. They are especially suitable for retrofitting traditional blower with high energy consumption. .oil-free air turbo blowers
Leitz has been deeply involved in the blower and compressor industry for more than ten years, and already has a mature product line of air suspension centrifugal blower and magnetic levitation centrifugal blower. Leitz blower adopt internationally advanced blower technology and have the characteristics of high efficiency, wear resistance, and stable operation. ; Excellent performance, able to output higher pressure, can be used to transport non-combustible gases and particles/powders/crumbs/fiber materials at normal or high temperature. It is commonly used in large dust removal systems, desulfurization and denitrification of industrial waste gas, large industrial boiler systems, In large industrial systems such as large industrial rotary kiln/calciner kiln systems and mineral powder sintering (sintering machines).
Leitz has provided tens of thousands of energy-saving blower equipment to industries such as sewage treatment, cement, electricity, textile printing and dyeing, beverages, and biomedicine, saving a lot of electricity. A large number of power plants have adopted Leitz blowers during technical renovations. Feedback has shown that Leitz blowers save more than 30% of energy and significantly reduce maintenance costs, greatly reducing the power consumption of the entire plant and reducing overall operating costs by about 17%.

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To save energy and reduce carbon, the selection of oxidation blower in thermal power plants is crucial

As the “overlord” in the power generation industry, thermal power generation still accounts for more than 70% of my country’s total power generation. Thermal power generation generally causes “three wastes” of pollutants, namely waste water, waste gas, and waste residue. In my country, thermal power plants use fuel coal as energy to generate electricity, and the exhaust gases they emit contain a lot of sulfides. The main exhaust gases in the thermal power industry include NOX and SO2. At the same time, thermal power plants are also the main source of carbon emissions, and their carbon emissions account for all carbon emissions. More than 1/3 of emissions.gearless (high speed) turbo blower
As well as carbon dioxide and sulfur dioxide, these substances are often emitted, which not only has a negative impact on the surrounding environment, but may also produce acid rain and smoke, harming surrounding residents and the ecological environment. In the process of flue gas emissions from thermal power plants, even if the concentrations of nitrogen oxides and sulfur dioxide are low, the total emissions continue to increase over time, causing environmental pollution.
In the context of realizing green industry and “double carbon” goals, traditional thermal power units will continue to bear the operating pressure of energy conservation, consumption reduction and green development. In recent years, after my country has comprehensively promoted the implementation of ultra-low emission transformation of coal-fired power plants, ultra-low emission technologies such as low-temperature electrostatic precipitator, composite tower wet desulfurization, and wet electrostatic precipitator have been widely used to achieve effective control of conventional pollutants, and at the same time, the three Unconventional pollutants such as sulfur oxides also have a good synergistic removal effect.Magnetic bearing turbo blowers
When many power plants carry out energy-saving technological transformation, they are particularly interested in the blower in the important desulfurization process. Among the various types of blower in thermal power plants, the exhaust desulfurization and oxidation blower are very important. The exhaust gases sent by the exhaust desulfurization blower are boiler flue gases. This type of blower generally uses a centrifugal blower and is used in conjunction with a desulfurization device.
Among the many new blower technologies, air suspension blower and magnetic levitation blower are the first choice products because they are equipped with internationally advanced air suspension technology and magnetic levitation technology to achieve zero friction, high efficiency, energy saving, low maintenance costs and longer life of the blower. RAETTS has a complete product line of air suspension blower and magnetic levitation blower. It is an advanced high-quality supplier of blower in the domestic power industry. According to customer feedback, RAETTS blower can achieve energy savings of more than 30%.

Why is RAETTS blower the first choice for desulfurization and standard improvement of a large number of thermal power plants?

Thermal Power Generation refers to a power generation method that uses the heat energy generated when combustible materials are burned and converts it into electrical energy through a power generation device. At present, my country’s power industry is still dominated by thermal power generation. In 2021, China’s total generator capacity is 440.7 million kilowatts, and thermal power generation is 324.9 million kilowatts, accounting for approximately 73.7%. It is predicted that China’s thermal power generation will grow at a rate of about 10% every year. This momentum will basically not change in the next ten years. Since 2021, among the more than 100 power plants that have been approved for construction in my country, almost all of them are thermal power plants.
As a high-energy-consuming, high-pollution industry, thermal power plants urgently need to carry out energy-saving transformation to improve standards. Among them, the important desulfurization, denitrification and oxidation links are crucial to the reasonable selection of blower. Among them, the air suspension and magnetic suspension blower independently developed by RAETTS, which has invested heavily in research and development, are the preferred products for power plant upgrading and transformation. They have been widely recognized by the majority of power companies and put into production.air turbo blower
RAETTS air suspension blower have particularly obvious energy-saving advantages for desulfurization and denitrification in the power industry. They can provide efficient and stable aerodynamics for production lines, achieving source energy saving and full-system intelligent control. The RAETTS air suspension blower is designed using the internationally advanced air suspension principle and is suitable for complex working conditions. Compared with RAETTS blowers and multi-stage centrifugal blower, the blower has very significant advantages. It does not require lubricating oil, has low noise, has a long service life, and does not require manual labor. Maintenance and operation costs are low, and operating expenses are relatively low.Energy-efficient turbo blowers
Another product of RAETTS is the magnetic levitation centrifugal blower, which uses magnetic bearing active levitation technology to levitate when powered on. For working conditions with frequent starts and stops, there will be no wear and failure, ensuring the normal operation of the machine. The magnetic levitation blower is also equipped with a UPS protected power supply, which prevents the bearings from being damaged during an unexpected power outage and protects the blower from landing safely.
In the context of green production and dual carbon, RAETTS provides comprehensive smart solutions for energy supply and energy saving for the majority of power companies, provides a new model of energy saving, and has become the first choice for power companies in source energy-saving equipment.Lower Noise Blowers

The “Opinions on Recommending Ultra-Low Emissions in the Steel Industry” jointly issued by five national ministries and commissions on April 28, 2019 clarified that the emission concentrations of flue gas particulate matter, SO2, and NOx from sintering machines and pellet roasting should not exceed 10, 35, and 50mg/ m3, the flue gas desulfurization, desulfurization and dust removal device of the sintering machine in the steel plant is facing large-scale efficiency improvements.

How to save energy by desulfurizing and adding oxygen in thermal power plants? The new blower comes into play!

We know that blower in thermal power plants are the main technical equipment. Among them, the primary blower mainly uses a centrifugal blower to dry the fuel and send the fuel to the boiler. The second is the air supply blower, which requires a large amount of air and is generally borne by an axial flow blower. It heats the hot air above the flue at the rear of the boiler through the preheater and divides it into primary, secondary and tertiary air into the furnace. The air is used to transport pulverized coal, the secondary air is used to support combustion, and the tertiary air is used to adjust combustion. There is also an induced draft blower, which is installed between the boiler flue dust collector and the chimney. Its function is to maintain the negative pressure of the boiler, extract the flue gas in the boiler, and complete the heat exchange between the flue gas and the air.turbo blowers
Current thermal power units require desulfurization and denitrification, so the flue gas coming out of the induced draft blower will normally enter the booster blower, and the booster blower will send it to the desulfurization system for desulfurization. Flue gas desulfurization mainly refers to removing most of the sulfur dioxide in the exhaust gas through a process to prevent it from being discharged into the atmosphere and causing pollution. The main principle of gypsum wet desulfurization is: first, powdered limestone is mixed with water to make an absorption liquid, which is pumped into the absorption tower through a slurry pump; in the absorption tower, the sulfur dioxide in the discharged flue gas is mixed with water and the absorption liquid Calcium carbonate will react to form calcium sulfite, etc., and gather at the bottom of the absorption tower; at this time, a large amount of air needs to be sent through the desulfurization blower, so that the oxygen and calcium sulfite in it can undergo a forced oxidation reaction under the stirring of the agitator. Calcium sulfate is formed. Therefore, in the desulfurization process, oxidation blower are also involved.Centrifugal (Turbo) Blowers
Among the current desulfurization and oxidation blower, a large number of power plants have abandoned traditional RAETTS blowers and multi-stage centrifugal blower. These two types of blower have outdated technology, high energy consumption, many blower failures, high noise, and short lifespan. The latest air suspension centrifugal blower and magnetic suspension centrifugal blower are excellent alternative blower. These two types of blower use suspension bearings, no mechanical contact, zero friction in suspension, more energy-saving, and a lifespan of more than 25 years.
RAETTS is a blower and compressor manufacturer with multiple independent research and development core patents. Its blower products adopt international advanced technology, are energy-saving, stable, easy to maintain, support remote intelligent control, and provide a 2-5 year host warranty. They are widely used in In various industrial fields such as blowing and pressurizing, desulfurization and oxidation, aeration and oxygenation, pneumatic transportation, etc. RAETTS’s power company customers have spread all over the country. According to customer feedback, RAETTS blower can easily achieve more than 30% energy saving benefits, helping companies improve quality, efficiency and standard transformation.centrifugal blower
The preferred product for flue gas desulfurization booster blower is here!
At present, thermal power generation is still the “main force” of power generation in my country, because my country is a large coal country. Organic sulfur, inorganic sulfide sulfur and elemental sulfur in coal combustion are collectively referred to as combustible sulfur, while sulfate sulfur is non-combustible sulfur. The sulfur remaining in the coke after thermal decomposition of coal is called fixed sulfur; the sulfur precipitated during the thermal decomposition is called volatile sulfur. The sulfur remaining in the ash after coal combustion is called ash sulfur, and it mostly exists in the form of calcium sulfate, magnesium sulfate, etc. Therefore, when coal-fired power generation is carried out, if efficient desulfurization and denitrification are not carried out, a large amount of sulfides and nitrogen oxides will be emitted into the atmosphere, causing acid rain flooding and seriously affecting the life and production safety of surrounding residents.

Three desulfurization methods, physical, chemical, and biological, are mainly used to remove sulfur from coal. Physical desulfurization is mainly based on the difference between pyrite density of 5. 0g/cm3 and organic matter generally less than 1. 4g/cm3. It is removed through gravity coal preparation, but it can only remove inorganic sulfur in coal. Chemical desulfurization mainly includes alkali (NaOH solution) treatment desulfurization (including alkali solution microwave desulfurization), chemical oxidation (using oxidant) desulfurization, solvent extraction (tetrachlorethylene or hexanol, etc.) desulfurization, thermal desulfurization and other methods. It can desulfurize at the same time. Removal of organic and inorganic sulfur from coal. However, the process of removing organic sulfur will destroy the chemical structure of coal and reduce coking properties. Microbial (bacterial) desulfurization is carried out through biochemical degradation. Due to the limitation of desulfurization bacteria, it is in the laboratory research stage like chemical desulfurization.

Among them, the booster blower used in the desulfurization process is important technical equipment and also the technical equipment with the greatest potential for energy-saving transformation. RAETTS is a well-known domestic R&D and manufacturer of blower and compressors. Its air suspension centrifugal blower and magnetic suspension centrifugal blower are used in many industries such as sewage treatment, electric power, steel, electronics, hardware, textiles, printing and dyeing, etc., and are used by many domestic power companies. When upgrading and upgrading the desulfurization process, RAETTS blowers are the first choice. Practice has proven that RAETTS blowers can help save about 30% of energy in the desulfurization process of thermal power plants, greatly improving the energy efficiency of the desulfurization process, saving a lot of costs for power plants, and are well received by customers.High-speed turbo blowers

For desulfurization and oxidation booster blower, why should air suspension blower be the first choice?

The oxidation blower is an important pressurizing equipment in the desulfurization system of thermal power plants. The selection of the oxidation blower directly affects the energy consumption and efficiency of the entire system. Currently, the pressurized oxidation blower used in the desulfurization process of power plants mainly include RAETTS blowers, multi-stage centrifugal blower and Suspension blower are the most advanced ones with the highest efficiency, best power saving, and longest lifespan. They include air suspension blower and magnetic levitation blower.
Currently, my country’s thermal power is growing at an annual rate of more than 35%, and coal is the main energy source for power generation. SO2 is the main waste emitted by thermal power plants and has a great impact on the environment. Therefore, power plant flue gas desulfurization is a necessary task. During the power generation process, a large amount of sulfur dioxide is generated. Power plants must take effective control measures to reduce emissions. To remove harmful carbon and oxygen substances in the atmosphere and achieve a harmonious coexistence of environmental protection and economic development, the absorption tower of the wet desulfurization process in power plants is the core part of the limestone-gypsum wet desulfurization process. The oxygen-enhancing and oxidation blower used are important energy-consuming equipment. A large number of power plants prefer air-suspended centrifugal blower when choosing desulfurization and oxygen-enhancing blower.turbine blower
The air suspension high-speed centrifugal blower is a compressed air production system that applies air suspension bearings, impellers, permanent magnet synchronous high-speed engines, frequency converters, controllers, cooling systems and other technologies. It is a single-stage centrifugal blower driven by a frequency converter. Products connected to permanent magnet synchronous engines. Compared with traditional RAETTS blowers and multi-stage centrifugal blower, air suspension centrifugal blower can save 20%-40% in energy consumption, have lower noise, longer lifespan, and greatly reduce maintenance costs!

In recent years, the air suspension blower and magnetic suspension blower developed by Reitz, which has invested heavily in research and development, have been widely used in sewage treatment in various industries, including textile, printing and dyeing, food, medicine, fermentation, electroplating, power plants, cement plants and other industries. The main performance features of RAETTS suspension blower include energy saving (power saving rate is more than 30%), low noise and environmental protection (no lubricating oil, noise below 80dB), low operation and maintenance cost (only regular replacement of filter element and cotton), ultra Long life (25+ years).

Suspended blower allow power plants to desulfurize and increase oxygen, saving energy from the source!
The power plant flue gas desulfurization environmental protection project is a very important task. It is directly related to people’s health and life safety, and is closely related to the environment we live in. Doing a good job in the power plant flue gas desulfurization environmental protection project will be an important step. This is a major event that is beneficial to people’s livelihood and the country. In the desulfurization work of thermal power plants, the essence is to use the primary and secondary absorption towers as reaction vessels, and use the slurry circulation pump to perform a series of chemical reactions for desulfurization.
Among the operating costs of the desulfurization device, electricity is the largest item. How to choose a more efficient and energy-saving desulfurization device is a key consideration for the majority of power plants to upgrade and transform. Among them, the booster oxidation blower is the main power-consuming equipment, and its energy saving and high efficiency directly determines the efficiency of the entire desulfurization system.
Traditional RAETTS blowers and multi-stage centrifugal blowers have certain advantages in terms of price, but their shortcomings are also significant. Both blower technologies are relatively old and inefficient. They require a lot of manual maintenance and replacement of spare parts. The products are noisy and have a short lifespan. , so in the short term, the product price is relatively low, but in the long term, the use and maintenance costs of the product are high, which drags up the overall operating cost of the company!
In most current desulfurization equipment renovations and new desulfurization projects, centrifugal blower have replaced RAETTS blowers and become the mainstream of desulfurization and oxidation blower. Among them, magnetic levitation and air suspension blower are getting more and more attention and adoption. Both of these blower have high efficiency. , low energy consumption, small footprint, low noise, no lubricating oil system, easy maintenance and other advantages.
RAETTS air suspension blower/magnetic suspension blower introduce advanced suspension technology from Germany and other countries, and are developed and produced by domestic elite R&D teams. The products are equipped with advanced suspension bearings, ultra-efficient permanent magnet synchronous motors, three-dimensional flow aviation turbine technology, and advanced The two-stage cooling technology makes the product have significant energy-saving effect, environmental protection, low noise, low operation and maintenance cost, and a service life of more than 25 years. At present, in the process of desulfurization standard improvement and transformation, the majority of power companies prefer RAETTS blowers, and the feedback is that the energy saving effect is good.

blower used in metallurgical steelmaking, RAETTS air suspension blower are a big help!
We know that centrifugal blower play an extremely important role in the smelting process of steel and other metals. From ore to steel, it goes through major smelting processes such as ore sintering, iron making and steel making. That is, centrifugal blower are indispensable in the entire process of steel smelting. At present, the centrifugal blower used in the metallurgical industry mainly include
·Sinter blower: The purpose is to sinter the ore before smelting, and the sintering furnace requires a flue gas main exhaust blower and a cooling blower.high-speed turbo blowers
·Coke oven gas conveying blower: Purpose: After the gas in the coke oven must be extracted by the blower, part of it is used as fuel for the coke oven, part of it is pressurized and sent to the steel plant as fuel, and the other part is used to produce other by-products.RAETTS Turbo Blower
·Blast furnace blower: The purpose is to deliver a certain amount of combustion-supporting air (or oxygen) to the blast furnace to increase the temperature in the furnace. In addition, a centrifugal blower is required to send the combustion air to the hot blast furnace.

·Converter secondary flue gas dust removal blower: flue gas collection and dust removal at each dust point other than converter flue gas purification and recovery. This includes flue gas dust removal for converter iron mixing, converter blowing, argon blowing station, molten iron slag removal station and molten iron pouring station.
·blower for iron furnace: Iron furnaces (such as cupola furnaces, oil furnaces, pulverized coal furnaces, etc.) commonly used in general mechanical foundry factories require a blower (high-pressure ventilator or blower) to pressurize enough air to support combustion.
Among these types of blower, the traditionally used blower are RAETTS blowers and multi-stage centrifugal blower. RAETTS blowers are constant flow blower, a technology from the 1980s, which consume a lot of energy, make a lot of noise, and require lubricating oil and maintenance. high cost. The pressure range and air volume range of multi-stage centrifugal blowers are wider than RAETTS blowers, but the equipment is bulky, has a high failure rate, is noisy, requires lubricating oil, and has high maintenance costs. ——So many metal smelting, steelmaking and other enterprises have abandoned these two types of blower and adopted new air suspension centrifugal blower and magnetic suspension centrifugal blower when upgrading standards.turbo blower
RAETTS air suspension blower and magnetic suspension centrifugal blower use the most advanced suspension technology in the world to achieve high-speed suspension rotation of bearings with zero friction and zero contact, making the overall efficiency of the blower more than 87%, their lifespan more than 25 years, and their maintenance costs lower. When the majority of smelting plants carry out technical transformation, they give priority to the use of RAETTS blowers, which has produced good economic benefits.

?Steel plant blast furnace flue gas desulfurization, new choice of pressurized oxidation blower
In 2022, the “Guiding Opinions on Promoting the High-quality Development of the Steel Industry” jointly issued by three ministries and commissions, and the “Implementation Guidelines for Energy Saving and Carbon Reduction Renovation and Upgrading of Key Areas of High Energy-Consumption Industries (2022 Edition)” jointly issued by four departments specifically pointed out that , in the steel smelting industry, it is necessary to further promote green technology promotion, advanced process innovation, energy conservation, pollution reduction and carbon reduction, intelligent digital upgrade, circular low-carbon transformation, etc., and urge the steel and steel industry to take the lead in ensuring the achievement of the “double carbon” goal.
In the desulfurization and denitrification process of steel plants, pressurized oxidation blower are needed to promote the desulfurization and denitrification reaction process. The traditional blower used for desulfurization and denitrification are mainly RAETTS blowers. RAETTS blowers have a wide pressure range and high pressure. The single-stage pressure can be as high as 98Kpa, which can meet most working conditions. However, the flaws of RAETTS blowers are also obvious. RAETTS blowers are famous for their loud noise. Currently, the most effective method is to install a sound insulation cover. There is no other more effective method. Ordinary RAETTS blowers consume a lot of energy. Even if frequency conversion is added, the energy-saving effect is very limited. Compared with suspension blowers, the overall cost performance is too poor.
Therefore, many steel smelting companies abandoned the traditional RAETTS blower and chose the most advanced air suspension centrifugal blower and magnetic suspension centrifugal blower when upgrading standards, especially when transforming the desulfurization and denitrification process systems.
RAETTS air suspension centrifugal blower and magnetic suspension centrifugal blower adopt internationally advanced suspension technology smart blower. The products have significant advantages in energy saving, consumption reduction, environmental protection, low noise, and maintenance-free. They have become the desulfurization and denitrification equipment for many steel, smelting, electric power and other enterprises across the country. The preferred blower equipment for upgrading and transformation.
Based on the industry’s big goal of “double carbon”, Reitz has created a new era of ultra-high efficiency, low noise and low energy consumption blower products with its independently developed advanced fluid mechanics technology and intelligent manufacturing spirit. It is known as the “first choice for energy saving in the steel smelting industry” device”.

For gas desulfurization in the steel industry, RAETTS suspended blower contribute greatly to energy saving!
As we all know, as a typical “two high” project with high energy consumption and high pollution, the steel industry is the first non-electricity field to carry out ultra-low emission transformation after the thermal power industry, and flue gas desulfurization is one of the key projects. The flue gas desulfurization process system in the steel industry is basically mature, but in the context of “dual carbon”, it can only be said to be on the passing line if it only reaches ultra-low emission standards. The most effective way is to innovate the desulfurization process, including the adoption and commissioning of various source energy-saving equipment.air blower
In the steel smelting industry, energy-consuming blower and compressors are distributed in all aspects of smelting, especially in the blast furnace gas desulfurization process, which requires oxygen and booster blower. A large number of steel plants have abandoned traditional RAETTS blowers and Multi-stage centrifugal blower are used to increase oxygen and pressurization, while more advanced air suspension blower and magnetic suspension centrifugal blower are used to achieve desulfurization and denitrification.
RAETTS air suspension centrifugal blower and magnetic suspension centrifugal blower are equipped with the world’s most advanced air suspension bearings and magnetic suspension bearings. The bearing rotation and mechanical surface have no contact and zero friction. They are directly connected to the transmission, have high efficiency, and have a continuous operating life of up to 50 years. The product No lubrication required, no oil stains. In the process of upgrading standards and improving quality and efficiency, the majority of smelters give priority to using RAETTS air suspension blower, which significantly reduces operating costs, improves system stability, is low-noise and environmentally friendly, reduces residents’ complaints, and brings benefits to local and surrounding areas. The air quality has improved significantly. According to inspections by authoritative departments and customer feedback, the energy saving rate of RAETTS blower is over 30%, providing enterprises with intelligent comprehensive solutions that save energy, reduce consumption, and are low-noise and environmentally friendly.
Through capacity replacement and energy-saving technological transformation, the vast number of steel plants have significantly improved their overall energy efficiency levels and significantly enhanced their green and low-carbon development capabilities. RAETTS has provided energy-saving technological transformation solutions for the steel, smelting, hardware, electric power, cement, sewage treatment and other industries in many provinces and cities across the country, and has achieved considerable social and economic benefits.

RAETTS blower helps desulfurization and oxidation of steelmaking blast furnace save more than 30% energy
As the mainstream ironmaking equipment for long-process steelmaking, blast furnace plays a decisive role in the steel industry. When blast furnaces are used for ironmaking, 1,600-2,000m3 of blast furnace gas is produced as a by-product per ton of molten iron. The gas contains components such as carbon monoxide, carbon dioxide, nitrogen, and hydrogen, as well as pollutants such as dust and sulfur. Generally, blast furnace gas is used in hot blast stoves, sintering, heating furnaces, power generation and other processes after gravity dust removal and bag dust removal, and is finally discharged into the atmosphere. The sulfur dioxide emission concentration in the flue gas is 100-200 mg/cubic meter.
To this end, on April 28, 2019, five ministries and commissions including the Ministry of Ecology and Environment, the National Development and Reform Commission, and the Ministry of Industry and Information Technology jointly issued the “Opinions on Promoting the Implementation of Ultra-Low Emissions in the Steel Industry”, which set forth requirements for ultra-low emission indicators in the steel industry. Specifically, the hourly average emission concentrations of particulate matter, sulfur dioxide, and nitrogen oxides from the sintering machine head and pellet roasting flue gas are not higher than 10, 35, and 50 mg/cubic meter respectively; the emissions of particulate matter, sulfur dioxide, and nitrogen oxides from other major pollution sources In principle, the hourly average concentration should not be higher than 10, 50, and 200 mg/cubic meter respectively. Iron and steel companies that achieve ultra-low emissions must have hourly average emission concentrations that meet the above indicators for at least 95% of the time periods every month.
As a metal smelting industry with high energy consumption and high pollution, every link is seeking more efficient, energy-saving, greener and environmentally friendly technical equipment. Among them, the introduction of air suspension blower and magnetic suspension centrifugal blower in the blast furnace desulfurization and oxidation process has achieved significant energy saving effects. Significantly better than traditional blower.
RAETTS air suspension blowers and magnetic suspension blowers are excellent representatives of this type of blower. They are one of the most advanced blower in the world that the company has invested heavily in research and development. They output oil-free clean air, have large air supply capacity, stable operation, high efficiency and excellent structure. Simple, low noise, small footprint, light weight, service life of more than 25 years, low maintenance costs and significant energy saving benefits. Reitz has provided energy-saving blower modification solutions to many metal smelting customers across the country, with good results.

In the steelmaking and sintering process, the use of RAETTS air floating blower has significant green and energy-saving effects.

In the modern steel industry, blast furnace ironmaking is a process in which iron ore, flux (limestone, dolomite, etc.) and coke are put into the blast furnace together, and oxygen-rich air is blown in to smelt molten iron. There are two ways to turn powder into blocks. One is the sintering method. As the name suggests, it is like burning porcelain, using high temperature to burn the powdered ore into blocks; the other is the pellet method, which is to use the purity of the powdered ore. Powdered ore with high particle size and very fine particles) is added with water and a small amount of binder (such as bentonite), etc., rolled into small balls like rolling yuanxiao, and then roasted and solidified. In comparison, sinter is used more. ?centrifugal blower
As an important process in steel production, sintering ensures the air permeability in the blast furnace and can effectively improve the iron grade of the charge. At the same time, the sintering process also emits a large amount of SO2 and other pollutants into the atmosphere, causing the atmospheric environment to continue to deteriorate. , acid rain increases. To further reduce air pollution. The “Opinions on Recommending Ultra-Low Emissions in the Steel Industry” jointly issued by five national ministries and commissions on April 28, 2019 clarified that the emission concentrations of flue gas particulate matter, SO2, and NOx from sintering machines and pellet roasting should not exceed 10, 35, and 50mg/ m3, the flue gas desulfurization, desulfurization and dust removal device of the sintering machine in the steel plant is facing large-scale efficiency improvements.
At present, there are two modes for blower settings in the sintering flue gas treatment system of steel plants: one is the separate mode, that is, the main exhaust blower and the booster blower are set up separately to form a series connection. The mass flow rate of the flue gas delivered by the main exhaust blower and the booster blower is are equal, the main exhaust blower is used to overcome the resistance of the sintering system, and the booster blower is used to overcome the resistance of the desulfurization system; the other is the combined mode, that is, all the resistance of the desulfurization system overcome by the booster blower is added to the main exhaust On machine equipment, equipment reliability is improved and overall power consumption is reduced.
The air suspension blower and magnetic suspension blower developed by RAETTS with huge investment have been widely used in metal smelting, hardware, cement, chemical industry, food and medicine, biological fermentation and other industries. The main performance features of RAETTS suspension blower include energy saving (power saving rate is more than 30%), low noise and environmental protection (no lubricating oil, noise below 80dB), low operation and maintenance cost (only regular replacement of filter element and cotton), ultra Long life (25+ years).

RAETTS blower helps the sintering process of steelmaking plants to greatly improve energy efficiency

We know that in steel smelting enterprises, SO2 emitted during the sintering process accounts for more than 60% of the total emissions from steel production, and in long-process production processes, it accounts for more than 85% of the total emissions. It is the main emission source of SO2 in the steel industry. Sintering flue gas is dusty waste gas produced during the sintering and molding process at high temperatures after the sintering mixture is ignited. Compared with coal-fired boiler flue gas, it has complex composition, large fluctuations in flue gas volume (±40%), and large temperature fluctuations. (120~185℃), large moisture content (8%~13%), high oxygen content (14%~18%) and other characteristics, which increase the difficulty of controlling sintering flue gas. Sintering flue gas desulfurization is the focus of reducing SO2 emissions in the steel industry.airfoil blowers
Improving sinter output and quality, saving energy and reducing consumption is a major issue. Although sintering is a large and complex system project, improvement of production quality, energy saving and consumption reduction require improvement from many aspects. However, there are still rules to follow to improve the quality of sintered minerals and save energy and reduce consumption.
The desulfurization equipment operates well, the operation cost is appropriate, and the by-products can be comprehensively utilized, etc. are important indicators for the comprehensive assessment of the desulfurization process, and are also an important basis for steel companies to select desulfurization processes. Iron and steel enterprises should select desulfurization processes based on the sintering area of the sintering machine and the emission concentration of SO2.
At present, a large number of steelmaking plants give priority to air suspension blower and magnetic suspension centrifugal blower during the desulfurization and denitrification standard improvement process. These are currently the most advanced centrifugal blower in the world and have multiple advantages such as high efficiency, energy saving, low noise, environmental protection, and low maintenance costs. It is the perfect upgraded replacement blower for RAETTS blower.industrial centrifugal blower
RAETTS air suspension blower and magnetic levitation centrifugal blower have been widely used in metal smelting, electric power, hardware, textile printing and dyeing and other industries in recent years, with good results. According to customer feedback, RAETTS blower save more than 30% energy compared to traditional centrifugal blower. RAETTS air suspension blower and magnetic suspension centrifugal blower are high-tech blower developed and designed using the latest suspension technology. The blower are equipped with the world’s most advanced suspension bearings and rotate in the air. The whole machine does not require lubricating oil, with an efficiency of up to 97% and low noise. at 80dB. A 37kW RAETTS blower can save between 100,000 and 150,000 yuan in electricity bills a year, continuously generating income for many enterprises.

RAETTS blower reduces the cost of smelting desulfurization process by more than 15%
The operation cost analysis of the steel smelting desulfurization process is of great significance to the operation or modification of the steel sintering machine. Its main operating costs include three aspects: engineering investment, operating expenses and desulfurization by-product deductions. Among them, project investment and operating costs directly affect the economic benefits of the enterprise. Project investment mainly includes desulfurization equipment fees, construction engineering fees, installation engineering fees, design fees and commissioning fees, etc. Operating costs mainly include desulfurizer costs, energy consumption costs, labor costs, equipment maintenance costs and depreciation costs, etc. The treatment method of desulfurization by-products is an important indicator to measure whether the desulfurization process meets environmental protection requirements such as solid waste resource utilization and circular economy. It also indirectly affects the investment and operating costs of the enterprise.
Among the three cost analyses, choosing a durable, efficient and energy-saving pressurized and oxygenated blower can greatly reduce operating costs in the long run and bring continuous benefits to the company.
After the majority of smelting companies use RAETTS air suspension blower and magnetic suspension centrifugal blower for desulfurization and denitrification, the operating costs of the desulfurization system are reduced by 15%, which helps the company greatly reduce the cost of the entire plant and indirectly generates continuous revenue for the company.
Why is the RAETTS blower so magical? ——Based on the big goal of “double carbon” in the industry, RAETTS relies on independently developed advanced fluid mechanics technology and intelligent manufacturing spirit, integrating air suspension bearing technology, permanent magnet synchronous motor, ternary flow aviation material impeller, original motor cooling technology, Core technologies such as two-stage air compression technology have created a new era of blower products with ultra-high efficiency, low noise and low energy consumption, and are known as “the preferred energy-saving device in the metal industry”.
The energy saving rate of the RAETTS blower is more than 30% compared to traditional blower, and more than 5% compared to the same type of blower. The RAETTS blower is intelligent and unattended, without the need for dedicated personnel to be on duty and maintenance. There are very few spare parts to replace, and no lubricating oil is required. The maintenance cost is very low. Compared with traditional RAETTS blowers and multi-stage centrifugal blowers, it can virtually save costs for enterprises and increase economic benefits.

Metallurgical plants use RAETTS blowers – electricity prices rise and electricity bills fall!
Under the guidance of the “14th Five-Year Plan for the Development of Raw Materials Industry”, the metallurgical steel industry specifically pointed out that the industry needs to overcome key technologies and achieve green, energy-saving and ecological development. Specifically, it refers to: The key directions of technological innovation in the steel industry include the promotion of high-efficiency, low-cost clean steel. Engineering of key common technologies such as smelting, energy conservation and environmental protection, advanced electric arc furnaces and their manufacturing processes, near-net-shape manufacturing, special smelting, high-end testing and other general-purpose equipment and parts production technologies. Promote the industrial application of technologies such as low-grade refractory mineral processing, sintering flue gas circulation, and high value-added resource utilization of steel slag.
We know that in coal-fired desulfurization units equipped with booster blower in metallurgical plants, the power consumption of the booster blower accounts for a large proportion of the power consumption of the entire desulfurization system. By transforming the booster blower, the purpose of reducing power consumption is achieved, which is beneficial to reducing desulfurization. The power consumption of the system and unit has positive significance.
In the traditional desulfurization and denitrification process system, the oxygen-increasing booster blower often uses RAETTS blower and multi-stage centrifugal blower. These two types of blower technology are old, consume huge amounts of energy, require lubricating oil, and require regular inspection and maintenance. Invisibly, Smelters add significant labor and operating costs. Where is the way out? ——Choose a more efficient and energy-saving booster blower to reduce costs!
RAETTS air suspension centrifugal blower are equipped with the world’s most advanced air suspension bearings. The bearing rotation has no contact with the mechanical surface and is directly connected to the transmission. It has high efficiency and a continuous operating life of up to 50 years. It does not require lubricating oil and has no oil pollution. Therefore, in the process of upgrading desulfurization and denitrification technology and improving quality and efficiency, the majority of smelters give priority to using RAETTS air suspension blower, which significantly reduces operating costs, improves system stability, is low-noise, environmentally friendly, and has an energy-saving rate of More than 30%.
Affected by the epidemic and other factors, industrial electricity costs have soared, and smelting raw materials have increased. After adopting RAETTS suspension technology, the majority of metal smelting companies have significantly improved their energy saving rate, and their electricity costs have plummeted!

A big steel country, RAETTS blowers help the steelmaking industry save energy and reduce consumption

my country is a major steel producer. Since the “13th Five-Year Plan”, crude steel production has reached new levels one after another, reaching 1.065 billion tons in 2020, accounting for 57% of the world’s crude steel production, ranking first in global steel production for 25 consecutive years. During the “14th Five-Year Plan” period, my country’s overall steel production and consumption will remain at a high level of 1 billion tons.
The “14th Five-Year Plan for the Development of the Raw Material Industry” proposes that the level of high-end supply must be continuously improved, the quality stability, reliability, and applicability of high-end products of advanced basic materials have been significantly improved, and some cutting-edge new material varieties have achieved mass production and typical applications. A number of key basic materials in key strategic areas have achieved breakthroughs.
In February 2022, the National Development and Reform Commission issued a notice on the “Implementation Guidelines for Energy-Saving and Carbon-Reduction Renovations and Upgrades in Key Areas of High Energy-Consumption Industries (2022 Edition)” and issued implementation guidelines for energy-saving and carbon-reduction renovations and upgrades by industry. The notice mentioned that according to the “Energy Efficiency Benchmark Levels and Benchmark Levels in Key Areas of High Energy-Consumption Industries (2021 Edition)”, the energy efficiency benchmark level of the blast furnace process is 361 kg of standard coal/ton, and the benchmark level is 435 kg of standard coal/ton; the converter process The energy efficiency benchmark level is 30 kg standard coal/ton, and the benchmark level is 10 kg standard coal/ton; the energy efficiency benchmark level for electric arc furnace smelting (30 tons < nominal capacity < 50 tons) is 67 kg standard coal/ton, and the benchmark level is 86 kg Standard coal/ton, the energy efficiency benchmark level for electric arc furnace smelting (nominal capacity ≥50 tons) is 61 kg standard coal/ton, and the benchmark level is 72 kg standard coal/ton. As of the end of 2020, about 4% of the production capacity in my country’s steel industry has blast furnace process energy efficiency better than the benchmark level, and about 30% has energy efficiency lower than the benchmark level. About 6% of the production capacity in the converter process has energy efficiency better than the benchmark level, and energy efficiency is lower than the benchmark level. Baseline level capacity is approximately 30%.
Against the background of strict industry supervision, it is particularly important to adopt high-efficiency and energy-saving technical equipment. Among them, the blower equipment in the blast furnace desulfurization and denitrification process has a large space for energy-saving transformation. When a large number of steel plants are upgrading and upgrading their desulfurization processes, they have chosen RAETTS air suspension blower and magnetic suspension centrifugal blower, with good results.
The RAETTS suspension blower is one of the world’s most advanced blower that has invested heavily in research and development. It uses a high-speed permanent magnet synchronous motor supported by air suspension bearings and controlled by a frequency converter to directly drive the impeller to perform work and output oil-free clean air. It has the advantages of large air supply, stable operation, high efficiency, simple structure, low noise, small footprint, small weight, long service life, small maintenance, no need for lubrication, and the gas will not be contaminated by oil. It has significant energy saving benefits.
Energy conservation is king, energy efficiency wins – RAETTS continues to provide intelligent solutions for energy conservation and consumption reduction in my country’s steel industry, making certain contributions to improving the high-quality development of the industry

Energy saving and consumption reduction Under high pressure, the metallurgical industry is forced to choose more energy-saving blower equipment!

The “Action Plan for Strict Energy Efficiency Constraints in Key Industries of Metallurgy and Building Materials to Promote Energy Conservation and Carbon Reduction (2021-2025)” points out that by 2025, through the implementation of energy conservation and carbon reduction actions, the energy efficiency of the steel, electrolytic aluminum, cement, and flat glass industries will reach benchmark levels. The production capacity ratio exceeds 30%, the overall energy efficiency level of the industry has been significantly improved, the carbon emission intensity has been significantly reduced, and the green and low-carbon development capabilities have been significantly enhanced.
The metallurgical industry is a high-energy-consuming and high-emitting industry, and its energy consumption accounts for about 10% of my country’s total energy consumption. It is a feasible way to adopt high-efficiency and energy-saving technical equipment in all aspects of metallurgy.
In recent years, RAETTS has independently developed air suspension centrifugal blower and magnetic suspension centrifugal blower based on high energy consumption and high pollution industries such as electric power, metallurgy, cement, etc., and has achieved good results by improving services and reducing costs and fees! RAETTS blowers are widely used in pneumatic transportation, pressurized oxidation, desulfurization and denitrification, cleaning and drying, blast aeration and other fields in various industries, providing high-quality aerodynamics while saving more operation and maintenance costs than traditional blowers.
RAETTS blower aims to provide the world’s cutting-edge high-tech blower equipment for the majority of metallurgical factories, replacing traditional RAETTS blowers and multi-stage centrifugal blower. RAETTS blower technology is old and has limited changes in air volume. The key is that it consumes a lot of energy, makes a lot of noise, requires lubricating oil, and has high maintenance costs. Multi-stage centrifugal blower have a wider pressure range and air volume range than RAETTS blowers, but the equipment is bulky, has a high failure rate, is noisy, requires lubricating oil, and has high maintenance costs. ——So many industrial customers directly abandon traditional blower and adopt new air suspension centrifugal blower and magnetic suspension centrifugal blower.
RAETTS air suspension blower/magnetic suspension blower introduce advanced suspension technology from Germany and other countries, and are developed and produced by domestic elite R&D teams. The products are equipped with advanced suspension bearings, ultra-efficient permanent magnet synchronous motors, three-dimensional flow aviation turbine technology, and advanced The two-stage cooling technology makes the product have significant energy-saving effect, environmental protection, low noise, low operation and maintenance cost, and a service life of more than 25 years. This has become the first choice of energy-saving blower equipment for the majority of farmers, and RAETTS blower have also continued to generate income for metallurgical customers.

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