Steel Plant Used Dust Filter Bags

Dust removal filter materials suitable for steel furnaces and kilns are divided into normal temperature filter bags and high temperature filter bags. Among them, normal temperature filter bags mainly include polyester needled felt and acrylic needled felt, and high temperature filter materials mainly include aramid needled felt (NOMEX, CONEX), P84 (polyimide) needled felt, and glass fiber needled felt Wait.

Polyester needle felt filter bags. The filter material is a woven filter cloth made of polyester staple fiber. It has the characteristics of high strength, low elongation, strong acid and weak alkali resistance, and its service life is generally 4 to 6 times that of glass fiber fabrics, and it has good air permeability. It has high dust collection rate, easy to clean dust, and the dust removal efficiency can exceed 98.99%. The filter material is most commonly used in normal temperature flue gas collection of dust collectors in steel furnaces and kilns.

Acrylic needle felt filter bags. The filter material is a synthetic fiber filter material, which has good hydrolysis resistance and is suitable for working conditions with a continuous operating temperature of 125°C to 140°C. The filter material has good resistance to organic solvents, oxidants, inorganic acids and organic acids, and has good hydrolysis resistance, but general alkali resistance. It is non-alkaline environment and high moisture content in steel furnaces, and is easy to produce oil mist The polluted environment can be used.

Aramid filter bags. The filter material is needle punched with Nomex fiber, has excellent temperature resistance, and can be operated continuously at a temperature of 204℃; it has good chemical resistance, low concentration of acid and alkali and most hydrocarbons. It will not cause any influence, even if it encounters a small amount of fluoride, there will be no obvious corrosion; it has outstanding high temperature stability, and the heat shrinkage rate is less than 1% at a temperature of 250 ℃; it has excellent fire resistance, at 400 ℃ It starts to decompose and carbonize, and its limiting oxygen index is 30 points. It neither spontaneously combusts nor supports combustion. The filter material is widely used in various high-temperature flue gas filtering occasions.

P84 needle felt filter bags. The filter material is a flame-retardant, temperature-resistant and stable fiber filter material, with a maximum temperature of 260°C. The filter material is mainly used for dry dust removal of blast furnace gas.

Fiberglass needle felt filter bags. The filter material is made of glass fiber monofilament interspersed randomly, showing a non-directional three-dimensional microporous structure, with small gaps and large gaps. It has good sound absorption, shock absorption, corrosion resistance, insulation, high temperature resistance, and flame retardancy. performance. The filter material has high porosity, low gas filtering resistance, high filtering wind speed, high dust removal efficiency, and has the advantages of bending resistance, wear resistance, and dimensional stability, and is used for high-temperature flue gas capture in steel furnaces.

PTFE filter bags. The filter material has non-stick properties, heat resistance (continuous use between 240°C and 260°C), sliding properties (lower friction coefficient), moisture resistance (the surface does not stick to water and oil), abrasion resistance, Corrosion resistance, mainly used for coating the surface of various dust removal filter materials to increase the filtration accuracy and environmental adaptability of dust removal cloth bags.

At present, the dust-removing  bag filter materials mainly used in the iron and steel industry are the first five types of the above-mentioned filter materials, which are used for dust removal in normal temperature environment, secondary collection dust and high temperature flue gas dust removal, etc.