The bag filter used in power plant boiler dust removal is required to be synchronized with the overhaul period of boiler equipment, and 30,000 hours has become the basic service period required by thermal power plants. However, for the same coal-fired power station boiler flue gas dust removal, the domestic application conditions are different from those of foreign countries. The main manifestations are: 1. Coal type: foreign use of clean coal and domestic use of raw coal, in terms of calorific value, ash content, S content, etc. There are differences; 2. Technical level: developed countries have a higher degree of equipment automation, and domestic equipment combines manual and automation; 3. Boiler equipment: boiler equipment in developed countries is relatively advanced, and there are still a large number of small and medium-sized equipment in China. The application environment of dust collection bags is "four highs, one large and one low" (the exhaust flue gas temperature is high, the flue gas content of SO2, NOx, and O2 is high; the dust content is large; the renovation project requires low filter material resistance), due to coal-fired boilers The exhausted flue gas conditions are relatively harsh, and the life of the filter material is facing a severe test. Therefore, when the bag filter is used for dust collection bags, the actual situation of domestic boilers should be considered, and the filter material should be selected according to the purpose. PPS and PPS+P84 dust collection bag PPS needle felt is currently one of the main filter materials used in the pulse cleaning bag filter of coal-fired power plant boilers. It is mainly suitable for flue gas treatment using low-sulfur coal. Select the polyphenylene sulfide (PPS) fiber produced in the United States, Japan and other countries, and manufacture and process filter materials according to the production process of high temperature resistant filter felt. PPS fiber is produced by only a few large chemical companies in the world, and the products of Japanese companies occupy the main market. The registered trademark of TOYOBO is PROCON/Pukang, the registered trademark of TORAY is TORCON/Triton, and the registered trademark of PHILIP is RYTON/Lyton or Leton , Ryden. At present, samples of PPS fiber have been produced in my country, but it is still in the stage of research and development and trial production. The application conditions of PPS needle felt mainly depend on the properties of PPS fibers. The suitable conditions for dust removal of coal-fired power plant boiler flue gas are: flue gas temperature 120-160℃, SO2 content in flue gas <8%, coal ash content <30 %; pre-coating is required before the boiler is started; when the fuel injection point furnace, the boiler tube bursts, and the flue gas is over-temperature, it is not suitable to directly enter the bag filter, and a bypass flue is required; the bag filter is designed to filter wind speed 1.0 About m/min, the resistance o...

FMS dust bag is a new type of high temperature filter material with reasonable structure and excellent performance. It has the advantages of using alkali-free glass fiber as the raw material, using high count glass fiber yarn, divided into velvet and mixed with other high temperature resistance The fibers are needle punched to improve corrosion resistance and flexural performance, making the felt layer more compact, and the entanglement between the fibers is enhanced, and the high temperature filter material with three-dimensional pores can cope with higher filtering wind speeds. The biggest difference between Fluormes and other high-temperature dust-removing cloth bags is that they have a good broad spectrum, which can be used under various working conditions and are impregnated with PTFE emulsion. The mouth of the flumesi dust bag is made of stainless steel spring ring, the bag head is the outer interface, the vertical side is diagonally seamed, and the outer layer is then wrapped with filter material. FMS dust bag is compounded with various high temperature resistant fibers to give full play to the function of chemical treatment and realize the combination of organic materials and inorganic materials, so that the veil and base fabric of the high temperature resistant Flumes dust bag are covered with a layer of organic Film; it also gives full play to the role of physical post-production and processing technology, and the high-temperature resistant Flumes dust bag obtains a high-quality surface state and achieves multi-functional practical effects. The high-temperature resistant Fluoromesi filter bag maintains the excellent performance of the glass fiber fabric's compressive strength, high temperature resistance, dimensional stability and no deformation according to the composite; it also fully exerts the characteristics of chemical fiber abrasion resistance and good flexural resistance. Fluorome The material characteristics of the dust filter bag are obviously improved, and the price is affordable. The surface of the filter material is beautiful and generous, smooth, soft to the touch, and rigid. Weight of Flumes dust bag: >800g/㎡ Material: PPS, glass fiber/glass fiber base cloth Thickness: 2.5-3.5mm Air permeability: 10-20m3/m3·min Warp tension: >2000N/5×20㎝ Weft tension: >2000N/5×20㎝ Warp elongation: <10% Weft elongation: <10% Operating temperature: ≤200℃, 230℃ for a short time Post-treatment: PTFE treatment, calendering Flumes dust bag is widely used in high temperature flue gas filtration and dust removal and material recovery in various industrial furnaces and kilns such as chemical industry, steel, metallurgy, carbon black, power generation, and cement.

The ptfe dust bag has a pore diameter of 0.1-3.5m, and the pore porosity reaches 75-90%. Such a high microporous porosity allows tiny water vapor molecules to diffuse freely through the gaps of the film, and therefore allows a large amount of dense water vapor to pass freely. However, the ptfe dust bag is extremely hydrophobic, and water cannot penetrate the microporous film. Since PTFE has good performance on any chemical substance, ptfe dust bag can be used in various chemical production technologies.   The F atom in the PTFE molecule is symmetrical, the two elements in C-F are covalently combined, there are no free electrons in the molecule, and the whole molecule is neutral. Make PTFE have excellent dielectric properties. Because there is an inert fluorine-containing shell outside the PTFE molecule, it has outstanding non-stick performance and low friction coefficient.      PTFE has outstanding excellent comprehensive properties, high temperature resistance, corrosion resistance, oxidation resistance, hydrolysis resistance, non-stick, self-lubricating, excellent dielectric properties, and a very low coefficient of friction. The mechanical properties of ptfe bag made of polytetrafluoroethylene are soft. Has very low surface energy. PTFE has a series of excellent performance:   High temperature resistance: long-term use temperature 200~260 degrees;    Low temperature tolerance: -100 degrees is also very soft    Corrosion resistance: can withstand aqua regia and all organic solvents;    Weather resistance: aging life in plastic;   High lubrication: the smaller coefficient of friction in plastics (0.04);    Non-stickiness: no substance attached, with small surface tension in solid materials;   Non-toxic: physiologically inert; excellent electrical properties, is an ideal c-level insulating material, the thickness of newspaper can further shield the high voltage of 1500V; smoother than ice.

PTFE dust bag is widely used and has good effect, especially in large-scale high temperature bag filter. The glass fiber membrane filter material produced by this technology has the advantages of low running resistance, long life, no film shedding, long-term working conditions of 260 degrees (instantaneous temperature up to 300oC), and all performances of the dust bag have no changes. The yield of dust below 5um is below 11.0 m. The service life of the dust bag will exceed 2 years. The material used for the ptfe dust bag, the scientific name is polytetrafluoroethylene, the Chinese trade name is "Teflon", "Teflon", "Teflon", "Teflon" and so on. Polytetrafluoroethylene is known as the "Plastic King". It is a polymer compound formed by the polymerization of tetrafluoroethylene. It can withstand all chemicals except molten alkali metal, chlorine trifluoride, chlorine pentafluoride and liquid fluorine. The boiling remains unchanged, and it is widely used in various occasions that require resistance to acids, alkalis and organic solvents. ptfe cloth bag has airtightness, high lubricity, non-adhesion, electrical insulation and good anti-aging ability, and excellent temperature resistance (it can work for a long time at a temperature of plus 250 to minus 180). Teflon itself is not toxic to humans. Operating temperature -190~250, allowing rapid cold and hot or alternate operation of cold and heat. Pressure -0.1~6.4Mpa. 1) Excellent temperature resistance, reaching 280 degrees. 2) Due to the special molecular structure of PTFE material, it has excellent chemical stability and corrosion resistance, which can improve the chemical erosion of the filter material. 3) Due to the non-sticky, water-repellent and non-flammable characteristics of PTFE fiber materials, this type of fiber becomes the most excellent filter material. 4) This kind of fiber is used as the base cloth, and the strength is basically guaranteed not to be attenuated during long-term use Fiber shape: Because of the different spinning methods, the fiber color is divided into white and brown. The white fiber is relatively pure, and the fiber shape is mostly flat, while the brown fiber contains a small amount of impurities, and the fiber shape is mostly round. The C-C bond is covered by the F atom in the PTFE molecule, and the C-F bond has a high and extremely stable bond. It is not corroded by any chemicals except for alkali metals and fluorine.

The membrane-coated filter material of the filter cloth is a layer of high-porosity membrane with a thickness of less than 0.1mm, and its pore size can be precisely controlled through the manufacturing process. For smoke and dust filtration, the film needs to be laminated to the base fabric to make it strong enough to be easy to use. The base fabric is non-woven or synthetic fiber. At present, the coated filter material has become one of the filter materials with a wide range of industrial applications. When installing the filter cloth, ensure that the filter cloth on the plate frame is flat and fixed to avoid damage to the filter cloth when the plate frame is compressed due to the filter cloth being discounted. The time for the filter cake to adhere to the filter cloth should not be too long, as too long will cause the filter cloth to deform and sag. When unloading the filter cake, shovel the filter cake in the direction of the filter cloth. Industrial filter cloth coating technology is mainly used in filtration and separation in the medical and pharmaceutical industries, food, beverage and wine industries, cosmetics manufacturing, electronics, energy, chemical, aviation, transportation and other fields. In terms of environmental protection, it is mainly used for sewage treatment, smoke purification, personal protection, and filtration and separation of suspended solids in gas and liquid. Industrial filter cloth coated filter media are classified into microfiltration, ultrafiltration, nanofiltration and reverse osmosis according to their functions. Examples of microfiltration separation of μm level, ultrafiltration separation of smaller particles to molecules, nanofiltration separation of molecules, and reverse osmosis separation of smaller molecules. Soot filtration generally belongs to the range of nanometers and above, that is, it only requires the purification of particles larger than molecules. Therefore, microfiltration membranes are often used. The traditional fiber filter material has obvious internal filtering characteristics, and the particles are attached to the fiber of the filter cloth. The membrane filter material is surface filtration, and the pore size of the microfiltration membrane filter material is quite uniform. The particles settle on the surface of the coating film and the surface of the particles, and few particles can enter the inside of the coating film. The difference between traditional fiber filter material and membrane filter material lies in the size distribution of voids. Compared with traditional fiber filter media, the pore size distribution range of the membrane filter media is very narrow, that is, the geometric standard deviation is very small.

The post-finishing process of needle punched non-woven filter material for bag filter mainly includes singeing, calendering, dipping, heat setting, laminating and so on. The filtration of the membrane filter material is carried out on the surface of the membrane, which is different from the deep filtration of the ordinary filter material. It belongs to surface filtration. Under normal working conditions, the filtration efficiency of the membrane filter material can reach 99.99%, and the discharge accuracy below 5mg/Nm3 can be controlled.  The membrane material used in the membrane filter material is mostly polytetrafluoroethylene (PTFE) microporous membrane, which is divided into high temperature membrane and normal temperature membrane. The PTFE microporous membrane is attached to the filter material using high temperature and pressure. For thermoplastic fiber filter media, the adhesive force generated by the remelting of the melt on the surface after uniform singeing has a positive effect on the film fastness; for thermoset fiber filter media, the PTFE microporous membrane can be pasted after special surface treatment. Close together firmly. PTFE microporous membrane has all the characteristics of PTFE material. Yuanchen Technology adopts imported Tokuden electromagnetic heating laminating machine, and uses the "high efficiency and low resistance" laminating technology independently developed by Yuanchen Technology to firmly bond with PTFE fiber filter material. It can effectively improve the filtration performance of the filter material and meet the ultra-low emission below 5 mg/Nm3.