KNOWLEDGE

Material analysis of dust filter bag 1

The dust bag is the heart of the bag filter in the operation process. Usually, the cylindrical pulse filter bag is suspended vertically in the dust collector. The dust-containing gas enters the dust collector from the air inlet, and passes through the baffle Part of the large dust particles in the dust are separated by inertial force and fall directly into the ash hopper. Dust-containing gas enters the filter area of the filter bag of the box body, most of the dust is trapped on the outer surface of the filter bag, and the clean gas enters the filter bag through the filter material, and the purified gas enters the upper box body through the filter bag mouth. After that, it is discharged from the air outlet. The cage inside the filter bag is used to support the filter bag and prevent the filter bag from collapsing. At the same time, it helps the dust removal and redistribution.

 

What are the materials of the dust bag?

1. Acrylic filter bag

Acrylic needle-punched felt, whose chemical name is polyacrylonitrile, is made into felt by needle punching using it as a raw material. After special water-repellent treatment, an acrylic medium-temperature hydrolysis-resistant needle-punched filter felt is obtained. The air permeability is 14M3/M2·min@200Pa, the instantaneous working temperature is 140, and the normal working temperature is 120. Needle-punched felt uses acrylic woven fabric as the base fabric to enhance vertical and horizontal strength. It has excellent chemical resistance and hydrolysis resistance and is widely used in dust collection of flue gas in asphalt, dryers, coal mills, and power plant sintering machines.

 

2. PPS filter bag

PPS needle felt is a filter material made of PPS fiber (polyphenylene sulfide) through three-dimensional needle punching. It can be used for a long time at a temperature of about 160°C. PPS fiber is also called polyphenylene sulfide fiber. Due to its special molecular structure, it has good chemical stability and strength integrity retention characteristics. It is particularly effective in flue gas environments with high sulfur content. It is suitable for coal-fired boilers. , Electricity, garbage incineration, and other highly acidic flue gas filtration environments.

 

3. Aramid filter bag

Aramid (common name: aromatic polyamide fiber), long-term temperature resistance of 204, instantaneous temperature resistance of 240, strong alkali resistance, medium acid resistance, is a good material for handling high-temperature gas at 180~220. Aramid needle-punched filter material is widely used in steel, cement, electric power, chemical, and other industries. It is an ideal flue gas dust removal filter material.

 

4. P84 high-temperature resistant dust removal filter bag

P84 needle felt is made by three-dimensional needle punching of P84 fiber. P84 fiber (ie polyimide fiber) has good high-temperature resistance, high-temperature resistance up to 260, and the cross-section of P84 fiber is irregular leaf shape, which can greatly improve the filtration Effect. The fiber itself also has a certain resistance to hydrolysis and oxidation. The product has good temperature resistance and good filtering effect and is widely used in complex working conditions such as concrete mixing, cement, garbage incineration, and coal-fired boilers.


5. PTFE filter bag

PTFE needle felt is a filter material made of PTFE (polytetrafluoroethylene fiber) through three-dimensional needle punching. PTFE fiber is a macromolecular linear structure, so it has strong temperature resistance, abrasion resistance, corrosion resistance, and chemical resistance. It is widely used in various harsh flue gas filtration environments such as steel, electricity, and garbage incineration.

 

6. Glass fiber filter bag

The filter material is a high-temperature resistant filter material with reasonable structure and good performance. It not only has the advantages of high-temperature resistance, corrosion resistance, dimensional stability, minimal elongation and shrinkage, and high strength of glass fiber woven fabric, but also the felt layer fiber supports single fiber, three-dimensional microporous structure, high porosity, and low resistance to gas filtration. , Is a high-speed, high-efficiency high-temperature filter material. Compared with other high-temperature resistant chemical fiber felts, it has special advantages such as low price, low running resistance, high filtration accuracy, and higher temperature resistance. Suitable for high-temperature flue gas filtration in steel, metallurgy, carbon black, power generation, cement, chemical, and other industries.

 

7. Film-coated filter bag

The above-mentioned filter bags of various materials can provide corresponding film-covered filter bags. PTFE microporous membrane can effectively filter out dust with a particle size of 2.5um. It is the first choice to solve PM2.5 and an important way to ensure that the emission concentration of various working conditions is below 10mg/Nm3. Our company cooperates with well-known domestic PTFE microporous membrane manufacturers to select high permeability and low resistance three-dimensional microporous membranes to develop and produce film-coated filter bags of various materials, which can meet customers' ultra-clean emissions.

 

8. Anti-static filter bag

The filter cloth for the anti-static dust bag is made of anti-static polyester needled felt, which has excellent anti-static performance. It is used in flour dust, chemical dust, coal dust, and other industries that may explode in case of electrostatic discharge. It is the best choice for explosion-proof dust collection at present. After the concentration of industrial dust reaches a certain level (ie, explosion limit), if it encounters factors such as electrostatic discharge sparks or external ignition, it is very easy to cause explosions and fires. For example, flour dust, chemical dust, coal dust, etc. may explode if exposed to electrostatic discharge. In the field of bag dust removal, if the dust needs to be collected with cloth bags, the filter material of the needle-punched felt anti-static dust collector is required to have anti-static properties.

9. Polyester filter bag

Polyester needle felt generally weighs 500g/m2, air permeability is 8~12m3/m2.min, working temperature: 120, instantaneous temperature: 150, post-treatment is singeing, calendering. Mainly used in iron and steel, metallurgy, machinery, non-ferrous smelting, coking refractory, cement and building materials, chemical industry, food, medicine, environmental protection equipment, and other industries.

 

SINO is a high-tech enterprise integrating the research and development, production, and sales of dust-removing cloth bags and denitration catalysts. Dust collection bags have been widely used in cement, steel, glass furnaces, waste incineration power generation, biomass power generation, non-ferrous metal smelting, and other industries!

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