The dust filter bag is the heart of the bag dust collector during operation. Usually the cylindrical pulse filter bag is hung vertically in the dust collector. The dust-containing gas enters the dust collector from the air inlet and passes through the dust collector. The guide plate of the hopper causes part of the large dust particles in the gas to be separated by the inertia force and fall directly into the ash hopper. The dust-containing gas enters the filter bag filter area of ??the box, and most of the dust is captured in the filter bag. The clean gas enters the inside of the filter bag through the filter material. The purified gas enters the upper box through the filter bag mouth and is then discharged from the air outlet. The cage inside the filter bag is used to support the filter bag and prevent it from collapsing. At the same time, it helps to remove and redistribute the dust cake.
Commonly used materials are divided into the following 8 types:
1. Acrylic dust bag
Acrylic needle felt, chemical name is homopolyacrylonitrile, use it as The raw materials are needle-punched into felt, and 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 instant 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 gases such as asphalt, dryers, coal mills, and power plant sintering machines.
2. PPS dust bag
PPS needle felt is a filter material made of PPS fiber (polyphenylene sulfide) through three-dimensional needle punching. It can be used at around 160℃ temperature for long-term use. PPS fiber, also known as polyphenylene sulfide fiber, has good chemical stability and strength integrity due to its special molecular structure. It is particularly effective in flue gas environments with high sulfur content and is suitable for coal-fired boilers. , electricity, garbage incineration and other highly acidic flue gas filtration environments.
3. Aramid bag
Aramid (common name: aromatic polyamide fiber) has long-term temperature resistance of 204°C and instantaneous temperature resistance of 240°C. It has strong alkali resistance and acid resistance. The performance is medium and it is a good material for handling high-temperature gases of 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 bag
P84 needle felt is made of three-dimensional needling of P84 fiber. P84 fiber (polyimide fiber) has good high temperature resistance Performance, high temperature resistance up to 260°C, and the P84 fiber cross-section is in an irregular leaf shape, which can greatly improve the filtration effect. The fiber itself also has certain hydrolysis and antioxidant properties. This product has good temperature resistance and good filtration effect, and is widely used in complex working conditions such as concrete mixing, cement, waste incineration, and coal-fired boilers.
5. PTFE dust bag
PTFE needle felt is a filter material made of PTFE (polytetrafluoroethylene fiber) through three-dimensional needle punching. PTFE fiber has a macromolecular linear structure, so it has extremely strong temperature resistance, wear resistance, corrosion resistance, and chemical resistance. It is widely used in various harsh flue gas filtration environments such as steel, electricity, and waste incineration.
6. Glass fiber filter bag
This filter material is a high-temperature resistant filter material with reasonable structure and good performance. It not only has the advantages of fiberglass woven fabrics such as high temperature resistance, corrosion resistance, dimensional stability, minimal elongation and contraction, and high strength, but the fibers of the felt layer bear single fibers, have a three-dimensional microporous structure, high porosity, and have low resistance to gas filtration. , is a relatively 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. It is suitable for high-temperature flue gas filtration in steel, metallurgy, carbon black, power generation, cement, chemical and other industries.
7. Coated cloth bags
The above filter bags made of various materials can provide corresponding coated filter bags. PTFE microporous membrane can effectively filter 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 under various working conditions is below 10mg/Nm3. Our company cooperates with well-known domestic PTFE microporous membrane manufacturers and uses high-permeability and low-resistance three-dimensional microporous membranes to develop and produce membrane-coated filter bags of various materials to meet customers' ultra-clean emissions.
8. Anti-static dust bag
The filter cloth of anti-static dust bag is made of anti-static polyester needle-punched felt, which has excellent anti-static properties and is used for flour dust , chemical dust, coal dust and other industries that may explode in the event of electrostatic discharge, it is currently the most ideal choice for explosion-proof dust collection.
After the concentration of industrial dust reaches a certain level (that is, the explosion limit), if it encounters factors such as electrostatic discharge sparks or external ignition, it can easily lead to explosions and fires. For example: flour dust, chemical dust, coal dust, etc. may explode if encountering 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 felt anti-static precipitator is required to have anti-static properties. Our company absorbs and digests foreign technology, and develops and produces permanent anti-static needle-punched filter felt according to the needs of domestic blast furnace gas coal grinding dust collection, cement plant coal grinding dust collection and other industries.