At present, the variety of filter materials for high temperature resistant dust filter bags is increasing, and the types include natural fibers, synthetic fibers, inorganic fibers and metal fibers. Below we do a simple analysis of several commonly used high temperature dust collector bags in practical application, hoping to help everyone correctly apply high temperature dust collector bags.
1, aramid needle felt high temperature dust collector bag fiber filter material can not be used calendering process post-treatment, but can be used singeing way post-treatment. Aramid fiber filter is a kind of hydrolytic fiber, in the presence of high temperature and chemical components and moisture will quickly hydrolyze and damage; in the moisture concentration of less than 10%, weak acid and neutral environment suitable for 190℃ operating temperature, service life up to 2 years; if the moisture concentration increases to 20%, service life such as to reach 2 years, you need to reduce the temperature to 165℃ below, if the temperature is still around 190℃, its life is only more than half a year. Aramid fiber filter media will be eroded by SOx, so it is often not used in power plants burning sulfur coal. When the moisture concentration is 10%, the temperature is 120℃, and the SO2 content is 50~400ppm, the strength retention rate is 58%. When the temperature rises to 180℃, the SO2 content is 50ppm, the strength retention rate is 30%. When the SO2 content is as high as 400ppm, the strength retention rate is only 5%. Therefore, in the presence of moisture and SOx, aramid fiber filter media should not be used, and PPS fiber filter media can be used instead.
 
2, PPS needle felt high temperature dust filter bag high temperature dust filter bag (polyphenylene sulfide) can be used continuously at a temperature of 190 ° C, instantaneous temperature can reach 200 ° C (accumulated 400 hours per year); in the autoclave at 160 ° C can maintain more than 90% of the strength. PPS filter material chemical resistance is very good, anti-sulfur, anti-acid effect is very good, so in coal-fired boiler is the most suitable filter material, about 80% of the existing PPS filter material used in coal-fired boiler, it only requires the sulfur content in coal below 3.5%, SO2 content in flue gas below 2700mg/Nm3. Its disadvantage is poor oxidation resistance, requiring O2 content less than 14%, NOx content less than 600mg/Nm3, if the O2 content reaches 12%, the recommended temperature drops to 140 ° C, in short, the higher the oxygen content, the lower the temperature used, because every increase of 10 ° C, chemical reactions will multiply. That is to say, if the original life of the filter material is 3 years, if the temperature increases by 10 ° C, its life is only 1 year and a half.

3, P84 needle felt high temperature dust filter bag high temperature dust filter bag (polyimide) fiber is irregular blade section, so than the general circular section increased by 80% surface area. P84 fiber has good high temperature resistance, can be used continuously at temperatures below 260 ° C, instantaneous temperature can reach 280 ° C (accumulated less than 200 hours per year), has a certain hydrolysis, it is recommended to use under conditions where the moisture content is less than 35%. P84 has certain oxidation resistance, the O2 content in the flue gas should be less than 16%, the NOx content should be less than 600mg/Nm3, if there is no O2 supplement, the NOx content can be relaxed to 1500mg/Nm3. SOx will reduce the filter life, it is recommended that SOx content is less than 700mg/Nm3, and desulfurization devices must be used in waste incinerators. nbsp;

4, PTFE needle felt high temperature dust filter bag high temperature dust filter bag (Teflon, scientific name PTFE) has excellent chemical corrosion resistance, corrosion resistance to all chemicals, known as the plastic king. PTFE is a macromolecular linear structure, in its molecular structure, fluorine atom volume is larger than hydrogen atom, fluorocarbon bond bonding force is also strong, play a role in protecting the entire carbon-carbon backbone, so that PTFE fiber chemical stability is excellent, low friction factor, with non-flammable, resistant to strong acids, strong bases, strong oxidants and other strong corrosive reagents or solvents, high and low temperature resistance and other excellent performance, long-term use temperature of-200~260℃. PTFE fiber filter material is widely used in garbage incineration, high sulfur coal dust removal and other fields.

5, glass fiber needle felt high temperature dust filter bag The most prominent advantages of high temperature dust filter bag are high temperature resistance, good size stability, high tensile fracture strength. Glass fiber in chemical corrosion resistance, in addition to hydrofluoric acid, high temperature alkali, other media are very stable. The disadvantage of glass fiber is its poor folding resistance. As a filter material, glass fiber can be used for a long time at 260℃. When using glass fiber filter media, you don't have to worry about changes in air permeability and filtration area, and you don't have to worry about problems such as wrinkles and accelerated filter bag damage due to shrinkage and increased cloth tension and filter bag elongation. Glass fiber has poor folding resistance, but its folding resistance can be greatly improved by controlling fiber diameter and surface chemical treatment. The use of glass fiber needle felt filter bag is extremely cost-effective, and can greatly reduce production costs compared with its P84, PTFE and other filter materials.

High temperature dust filter bag High temperature dust filter bag is widely used in steel, power, cement, chemical, lithium battery plant, petrochemical, non-ferrous smelting, waste incineration, coal chemical, desulfurization and denitration industries.