The process of desulfurization is to make slurry of alkaline desulfurizer and mix it with boiler flue gas, SO2 becomes acid when it meets water and reacts with alkaline desulfurizer to produce CaSO4, etc. Denitrification The principle of denitrification is similar to that of desulfurization, except that the denitrifying agent is replaced by ammonia or urea. I. SCR technology(Selective catalytic reduction technology): mainly using NH3, urea, etc. as reducing agents, selectively reducing NO2 to non-toxic and harmless products N2 and H2O over an appropriate catalyst. N2+O——>NO+N N2+O2——>NO+O N+OH——>NO+H II. Ozone oxidation technology: the integrated technology of desulfurization and denitrification, which utilizes the strong oxidizing property of O3 to oxidize the insoluble NOx in flue gas into NO2, NO3 and N2O5 which are easily soluble in water, and is absorbed by the subsequent system together with SO2 in the spray tower by alkali solution. NO2+H2O——>HNO3+NO N2O5+H2O——>HNO3 NO+NO2+2NaOH——>2NaNO2+H2O III. Plasma technology: plasma treatment of SO2 and NOx in flue gas is a dry desulfurization and denitrification technology that uses activated oxidation that generates high-energy electrons to generate ammonium sulfate and ammonium nitrate from the oxides of SO2 and NOx in flue gas with the addition of NH3.

Different industries and factories use different dust removal filter bags. First of all, we have to analyze which bags are commonly used. The materials of dust removal filter bags include normal temperature type cloth bags, medium temperature type cloth bags, and high temperature filter cloth bags. Different types of cloth bags have different characteristics. Normal temperature type cloth bag: The main material of normal temperature type cloth bag is made of polyester, polypropylene, acrylic and other fiber materials through non-woven and textile technology. Medium temperature type cloth bag: The medium temperature filter material includes aramid fiber and PPS series fiber through impregnation, waterproof, oil-proof and anti-corrosion process, so as to achieve the ideal filtering effect. High temperature cloth bag: The high temperature cloth bag is mainly made of high temperature resistant fiber materials such as P84, expanded glass fiber, and ultra-fine glass fiber. The use of dry filter bag dust removal technology in blast furnaces has been successful in purifying gas, and the over 5,000 cubic meters of extra-large blast furnace gas in Shougang, Wuhan Iron and Steel and Baosteel all use dry pulse filter bag dust removal technology for operation. The blast furnace gas is dry purified by the filter bag dedusting technology, which replaces the previous two-stage venturi wet dedusting technology. Its outstanding advantages are that it can save 30% of the total investment, save 50% of land, save 200kg/t iron, save more than 70% of electricity, and greatly improve the quality of gas after the water content and dust content are greatly reduced, which can be used for power generation. Or other use, the thermal efficiency is significantly improved. It can also reduce the number of workers and greatly reduce the amount of soot and waste water. If the blast furnace gas is purified by the dry filter bag dust removal technology, it will save more than 80 million tons of water and reduce nearly 80 million tons of wastewater discharge. The dust filter bag configured by the bag filter used for blast furnace gas purification is made of Nomex needle-punched felt in foreign countries. In China, high temperature resistant dust removal filter bags made of glass fiber and aramid fiber are used.

1. First disassemble the dust filter bag. 2. Put the dust filter bag into the hole of the cell plate. 3. Flatten the bayonet to the hole of the cell plate. 4. Bend the bayonet inward. 5. Align the bayonet slot with the cell plate hole. 6. Adjust the position of the bayonet. 7. Press the bayonet to confirm the position. 8. The dust filter bag is installed in place. 9. Insert the bag cage of the dust filter bag.

In places with explosive dust (such as coal mining fields, metal powder processing, flour mills, etc.), under certain conditions, sparks, open flames, and even deflagration or explosions may occur. Therefore, the flame retardant or fire resistance of the filter material is very important, which can effectively prevent the danger. Yuanchen Technology combines the strengths of "physics and chemistry" and combines graft copolymerization, sol-gel and supercritical drying methods to develop Xingyuan Fire-retardant filter material, which can meet the requirements of different flame-retardant occasions. Xingyuan·Fire-retardant filter material is divided into two series - fire-retardant series and fire-resistant series. Xingyuan∙ Flame Retardant series filter material can directly resist the collision of sparks. After leaving the flame, it can self-extinguish immediately, and will not continue to burn or smolder. Xingyuan∙flame retardant series filter media combines grafting, flame retardant modification and membrane permeation treatment. The flame retardant performance of filter media is improved by grafting technology (such as filter media and styrene sulfonate graft copolymerization), and the performance of flame retardants is improved by adding siloxane additives and nanoparticles to conventional flame retardants. The flame retardant filter material was prepared by membrane permeation treatment. The limiting oxygen index of Xingyuan·flame retardant series filter material is about 30, and the flame retardant grade is B1. Yuanchen Technology's flame-retardant-fire-retardant technology can be applied to different types of fibers. Xingyuan·Fire-retardant and flame-retardant series filter materials can effectively deal with various working conditions that generate sparks and sparks, escort the safe and stable operation of dust collectors, and create new products for customers. more value.

P84 filter material characteristics Continuous operating temperature/instantaneous temperature °C, dry heat state: 240/260 Abrasion resistance: good Spinnability: Excellent Hydrolysis resistance: good Alkali resistance: general Organic acid resistance: very good Mineral acid resistance: very good Antioxidant: very good

There is a time limit for the service life and use cycle of the dust filter bag. Generally speaking, the theoretical life of the dust filter bag is generally about 3-4 years. In fact, in the process of use, the cycle of the dust collector bag is different. For example, the working conditions are bad, whether it exceeds the tolerance range of the dust removal bag, such as high dust concentration, high temperature and other factors, which will cause the dust removal bag to have a long service life. Therefore, when we purchase dust removal bags, we should look at what kind of bags we should focus on according to the industry requirements and working conditions characteristics, such as wear resistance, corrosion resistance, acid resistance, oxidation resistance, etc., and then customize the dust removal bags. In addition to the daily maintenance and maintenance of various dust removal bags, the service life of the dust removal bags will be greatly increased on the whole. 1. High temperature oxidation affects cloth bags In order to use the filter material for power station boilers for a long time in the design life of the flue gas that needs to be dedusted, to ensure that its characteristic indicators do not decrease, the surface singeing, polishing, heat setting, spark-proof, coating, A series of special processes such as waterproof, oil-proof and anti-static. When the oxygen content of the high-temperature flue gas is high, the filter material will be oxidized, which will weaken the strength and be easy to break. 2. Low temperature condensation When the exhaust gas temperature is lower than the dew point, condensation will occur, which will reduce the characteristic index of the filter bag. In severe cases, the surface area of the filter bag will be hardened and even fall off together with the filter bed, which will seriously affect the service life of the filter bag. In addition, the winter in the northern region is cold, which is easy to cause the phenomenon of cake sticking on the inner wall of the ash hopper, so that the ash cannot flow out normally. 3. The running strength of the cloth bag In actual operation, the operating conditions need to be changed frequently, so that the environmental conditions of the filter bag exceed the range required by the design performance indicators, such as the increase of exhaust gas temperature and the increase of dust concentration, etc., which will cause the filter bag. The service life is lower than the design life. 4. The actual temperature of the bag When the exhaust gas temperature is around 140℃, the life of the filter material can reach 40000h. When the flue gas temperature rises to 150℃, the life loss of the filter material gradually increases with the increase of temperature, and when it reaches above 230℃, the filter The life of the material is reduced to zero, and the filter material will be burned; therefore, the exhaust temperature should be strictly controlled during operation to prevent long-te...