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China's filter material and bag type dust removal technology are developed simultaneously. In the 1970s, glass fiber woven filter material, 208 polyester flannel cloth and 729 polyester woven filter material were developed. In the early 1980s, with the development of non-woven fabrics, the synthetic fiber needle felt was successfully developed, which improved the dust removal effect of the bag filter by an order of magnitude; after that, the polysulfonate needle felt filter material was successfully developed. It can withstand temperature of 210 °C and is applied to high-temperature flue gas treatment in steel, non-ferrous, carbon black and other industries. The development and production of anti-static, high-temperature resistant, anti-corrosion, oil-proof and waterproof synthetic needle felt products basically meet the dust removal. Demand. In the late 1990s, China developed a polytetrafluoroethylene microporous membrane filter material to achieve surface filtration and achieve high efficiency and low resistance.
Classified by structure
1 woven filter material
The woven filter material is a fabric in which warp and weft yarns are continuously interlaced at right angles according to certain rules. The basic structure has three types: plain, twill, and satin. In order to improve the performance of the woven filter material, a weft double or double layer structure is often used. It has the following characteristics: good strength and wear resistance, can withstand large pressure and filter abrasive dust; suitable for making large diameter and long filter bags; easy to form flat and smooth surface or thin soft fabric, which is beneficial to The filter bag is cleaned. However, the woven filter material production process is long. Compared with the non-woven filter material (such as needle felt), the resistance of the filter material itself is large at the same filtration speed; the woven filter material can only block after forming the dust layer. Small particles, the dust collection rate will be significantly reduced after the dust is removed.
Figure 1 woven fabric
2 non-woven filter material
Currently used is a needle felt filter material. The fibers in the needle felt filter material are arranged in a three-dimensional staggered manner. This structure is beneficial to the formation of the dust layer, and there is no through-hole after the cleaning, and the dust-collecting effect is stable, so the dust-collecting rate is higher than that of the general woven filter material; Good gas permeability, low resistance; simple production process and low product cost. Almost all short fibers with a linear density of 2 dtex are currently used.
3 composite filter
In order to take advantage of the material length and avoid the shortcomings, two or more different materials can be processed into a composite filter material, and the polytetrafluoroethylene (PTFE) film filter material belongs to the filter material.
Classified by temperature
1 normal temperature filter material
Generally, the temperature is within 130 °C. Mainly polyester, acrylic, polypropylene.
2 high temperature filter material
The general temperature is 130~260 °C. Polyimide fiber (P84), polyphenylene sulfide fiber (PPS), aramid fiber (Nomex, Conex), glass fiber (GF).
3 ultra high temperature filter material
The use of such filter materials does not require pre-cooling of various types of high-temperature flue gas generated in industrial production, but the filter material is expensive, and is mainly used in occasions where the temperature environment is very harsh, and the amount is small. Ultra high temperature filter materials are:
1) Metal fiber needle felt: It can be used at a high temperature of 300 ° C ~ 600 ° C, and the general use temperature is 450 ° C. Such fiber mats are available in stainless steel needle felts and the like.
2) High silica filter: This filter material is made of a special glass fiber and can be used for a long time at 600 °C. The maximum temperature is 800 °C.
3) Ceramic fiber filter material: This kind of filter material can be used at 760 °C for a long time, and the maximum temperature can reach 1000 °C.
At present, the development trend of filter media is: (1) the development of a two-dimensional woven filter cloth to a three-dimensional structure of non-woven filter cloth; the development of a short-fiber fiber woven filter cloth to a filament filter cloth; multifilament twisting The filter cloth was developed to a monofilament filter cloth. (2) The conventional chemical fiber filter cloth develops toward the high-performance multi-functional, high-quality filter cloth, and the synthetic fiber filter material develops toward the film filter material.
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