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...

Due to the variety of materials and specifications of filter bags in real life.  Therefore, when choosing filter bags, we should also choose according to the nature and actual needs of different filter medias. Polyester Fiber Polyester filter media are usually used in low temperature situations, and membrane mulching is usually not needed. Only when the discharge requirement < 30 mg/Nm ³, or when the dust is very fine and the humidity is high. Teflon Polytetrafluoroethylene (PTFE), also known as Teflon, is stretched to become a strong multi-porous material with a pore size of 0.1μm ~ 2.0μm, a porosity > 80%, excellent chemical corrosion resistance, cold and heat resistance, long-term use at-200℃ ~ 250℃, good electrical insulation and smooth surface properties. Polytetrafluoroethylene filter materials are often treated with film mulching or acupuncture to improve dust removal efficiency and prolong filter bag service life. Nomex Nomex filter media can be used for filter bag in the case of higher temperature and thicker dust particles. Nomex has good resistance to high temperature and is more resistant to bending than fiberglass. It can use higher injection pressure and can inject more filter bags with the same pulse valve. Glass Fiber Glass Fiber has good high temperature resistance, tensile resistance, acid-alkali resistance and hydrophobicity, but the glass fiber filter material is not resistant to bending, easy to be damaged in installation and operation, can not be cleaned under high pressure, and has high requirements for filter bag skeleton. After secondary treatment and film coating, the filtration performance of glass fiber is very excellent, and it has been widely used as filter bag material in Europe and the United States. P84 The high temperature resistance of P84 filter bag is slightly lower than that of glass fiber, the acid and alkali resistance is good, and the price is more expensive. Because of its special fiber structure, it is usually unable to cover the membrane, so the filtration efficiency is not as good as that of the coated filter bag.

According to the analysis of the corrosion results of the PPS filter bag, there are three main sources of corrosion: oxidation, sulfur trioxide and nitrogen dioxide. 1. S—H2SO4 S in the flue gas forms SO2 and then becomes SO3 by oxidation. In the presence of water vapor, sulfurous acid vapor and sulfuric acid vapor or aerosol will be formed and condensed on the PPS filter bag to form dilute sulfurous acid and dilute sulfuric acid. With the passage of filtration time and the increase of temperature, the water in dilute sulfurous acid and dilute sulfuric acid is volatilized and gradually converted into concentrated sulfuric acid with strong oxidizing property, which oxidizes and corrodes the PPS filter bag and makes the PPS filter bag ineffective. 2. NO2 Strong oxidants can directly oxidize and corrode the PPS polymer chain, resulting in chain scission of the PPS polymer chain. In the presence of water vapor, nitric acid vapor will be formed to condense and oxidize PPS on the filter bag, and at the same time, in the presence of concentrated sulfuric acid and a catalyst, a nitrification reaction will occur. 3. O3 Strong oxidizing property, it can directly oxidize and corrode PPS, resulting in a sharp decrease in the strength of the fiber filter bag. At the same time, O3 also has the ability of desulfurization to remove S in the PPS molecule.

Due to the late start of flue gas denitrification project in China, some domestic enterprises engaged in waste flue gas denitrification catalyst treatment adopt on-site regeneration method. However, from the present point of view, factory regeneration is the mainstream denitrification catalyst regeneration scheme in the international arena. Factory regeneration is an organic combination of physical and chemical methods that can completely remove the surface and microporous blockage of denitrification catalysts, and more importantly, remove the chemically toxic arsenic, phosphorus and alkali metals effectively as well. Plant regeneration allows for a tightly controlled drying and calcining environment, which is critical to the effectiveness of the chemically active loading process. A true plant regeneration process is a complex physicochemical process and a regeneration solution tailored to each customer that restores the chemical performance of the denitrification catalyst to 100%. Plant regeneration is equipped with wastewater treatment facilities that can treat the wastewater generated during the regeneration process to meet the discharge standards. On August 19, 2014, the Ministry of Environmental Protection of China rejected on-site regeneration and encouraged factory regeneration in the Guidelines for Review of Hazardous Waste Business License for Waste Flue Gas Denitrification Catalysts. Therefore, plant regeneration is the mainstream technology in denitrification catalyst regeneration industry. Denitrification catalyst regeneration technology has nearly 20 years of application experience abroad, with mature technology and a large number of successful application results, while the domestic regeneration business has just started, with only a few application results. At present, the main foreign companies regenerating denitrification catalysts are Ebinger (Germany), Steag (USA), Coalogix (USA), etc. Ebinger (Germany) is the originator of catalyst plant regeneration technology. Coalogix, with technology from both Ebinger and Steag, is the second largest regenerator after Steag. The regeneration methods of each company basically include the following steps: ① vacuum or compressed air blowing; ② cleaning solution soaking or spraying; ③ ultrasonic cleaning; ④ active component re-impregnation; ⑤ calcination. The denitrification catalyst regeneration project is in line with the national environmental protection policy, which can save a lot of resources for the country and avoid secondary pollution to the environment, and is a project clearly encouraged by the state. In terms of market prospect, denitrification catalyst regeneration is very much in line with the current development trend and has a good domestic market. At present, domestic enterprises are also actively introducing foreign advanced technology, and the regeneration of denitrification catalysts will definitely usher in a great development.