High temperature dust filter bag material characteristics

High temperature dust filter bag material characteristics:

1, currently widely used high temperature dust filter bag - polyphenylene sulfide (PPS)

Characteristic description: Polyphenylene sulfide fiber, with stable chemical properties, high melting point (285℃) and excellent heat resistance, its flame retardant, chemical resistance and stability are also extremely outstanding, mainly used in municipal waste incinerators, public engineering boilers, coal-fired boilers, hospital incinerators, cogeneration boilers on the pulse bag dust collector, is currently widely used high temperature dust filter bag.

2. Temperature resistant high temperature dust filter bag -polyimide fiber (P84)

Characteristic description: Polyimide fiber, also known as arylimide fiber, is a high performance fiber made by the polymerization of polyamide acid prepolymer with homophenyltetrasic acid dianhydride and aromatic diamine, and then spun by solution. Polyimide fiber has excellent comprehensive properties, high temperature resistance, good filterability, acid and alkali resistance, and can be used in cement kiln tail, waste incineration, power plants and other high temperature environment.

3, high temperature dust filter bag with good corrosion resistance - polytetrafluoroethylene fiber

Characteristic description: polytetrafluoroethylene fiber is a synthetic fiber made of polytetrafluoroethylene as raw material, which is cut or fibrillated after spinning or making a film. At present, there are four main production methods of polytetrafluoroethylene fiber, including emulsion spinning and paste extrusion spinning.

Polytetrafluoroethylene fiber inherited polytetrafluoroethylene chemical stability, wide range of use temperature, resistance to atmospheric aging, radiation resistance, low permeability and many other advantages, It is mainly used as high temperature dust filter bag, strong corrosion resistance filter material for gas or liquid, pump and valve packing, sealing belt, self-lubricating bearing, reinforcement material for perfluorinated ion exchange membrane for alkali production and the sheet for rocket launch pad.

PTFE fiber and PTFE filter bag

Polytetrafluoroethylene dust filter bag has two forms: one is polytetrafluoroethylene fiber coated on the substrate made of other filter materials (polyphenylene sulfide fiber, P84 polyimide fiber, glass fiber, etc.), the other is the coating and substrate are made of polytetrafluoroethylene fiber, processed into needle felt. The performance of the PTFE fiber filter bag is better. Although the performance is superior, the high price of polytetrafluoroethylene fiber is an obstacle to its widespread promotion.

4, use for a wide range of high temperature dust filter bag -aramid fiber

Description: Aramid fiber is a high-performance synthetic fiber, developed by the DuPont company, with ultra-high strength, high modulus and high temperature resistance, acid and alkali resistance, light weight, heat and flame retardant and other excellent properties, a wide range of applications. At present, the commercialized aramid varieties on the market include meta-aramid and para-aramid, as well as a small number of modified products such as aramid II and Aramid III.

Intermediate aramid has high temperature resistance, flame retardant, insulation properties, mainly used in high temperature protective clothing, electrical insulation and high temperature filtration fields. The application of para-aramid mainly uses its high strength and high model point, which is applied to personal protection, bulletproof armor, mechanical rubber products, high-strength cables, asbestos substitutes.

Nomex fiber and Nomex fiber filter bag

The field of high temperature dust removal is the main consumer market of meta-aramid. Because the cost performance is not dominant compared with glass fiber and PPS, aramid fiber currently occupies only about 5% of the high temperature filtration industry. Compared with other fibers, the outstanding performance of aramid fiber filter bag is its very low shrinkage rate in high temperature applications, and it can still maintain 1% shrinkage rate in 250°C environment for 1000 hours. 5, economic high temperature dust filter bag material - glass fiber

Glass fiber is a traditional filter material, and it is also a widely used filter material in medium and high temperature flue gas dust removal. Glass fiber according to the different glass composition, can be divided into C (alkali) glass fiber filter material and E (alkali free) glass fiber filter material two categories.

Characteristic description: Glass fiber has outstanding high temperature resistance, and can work for a long time under the temperature condition of 260℃ (medium alkali) /280℃(no alkali). The instantaneous temperature can reach 350℃. High strength, small expansion rate, its tensile strength than other natural, synthetic fibers are higher, excellent corrosion resistance, resistance to most acids (except hydrofluoric acid) corrosion. The surface of glass fiber is smooth, and the filtration resistance is small, which is conducive to dust stripping. It does not burn or deform. Glass fiber treated with different surface treatment agents has the advantages of soft, smooth, hydrophobic, anti-condensation and low shrinkage. Glass fiber has outstanding dimensional stability, high tensile fracture strength, strong corrosion resistance, smooth surface, hydrophobic breathable, easy ash cleaning, good chemical stability, because of its low price, when the user requirements are low, dust removal equipment manufacturers also use glass fiber as a pulse bag filter.