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High temperature filter material

Author:admin   AddTime:2021-10-01

At present, the problem of environmental pollution is one of the issues that the world attaches great importance to, and it is related to the survival of human beings, animals and plants. With the rapid development of global industry, industrial dust pollution is becoming more and more serious. Among them, cement, steel, chemical, waste incineration and other industries will generate dust and accompanied by high temperature and corrosive gas during operation, which needs to be controlled in time. However, the general filter material cannot satisfy the filtration of the high temperature, corrosive gas and high temperature dust generated by the above industries. At present, high temperature resistant filter materials mainly use inorganic fibers and high temperature resistant synthetic fibers. Inorganic fibers have relatively poor toughness, abrasion resistance, flexural resistance, and chemical resistance, and their use is limited. Therefore, domestic and foreign research institutions and companies are committed to the research and development of high-performance, high-temperature-resistant synthetic fibers. Polyimide fiber has outstanding high temperature resistance, corrosion resistance and flame retardant properties. The filter material made from this can meet the filtration of high temperature dust, high temperature and corrosive gas, and fully guarantee the filtration efficiency of the filter material and extend the service life ,reduce costs. In addition, polyimide fiber has the characteristics of high strength and high modulus, and its mechanical properties are excellent. The dust concentration and polyimide fiber can withstand greater resistance. The heat-resistant polyimide staple fiber produced by Evonik (yingchuang), namely P84 fiber, has formed a large-scale production capacity with excellent high temperature resistance, corrosion resistance and flame retardant properties. In addition, the fiber can be specially spun The three-lobe cross-section structure is made. After the filter material is made, this irregular structure can improve the ability to collect dust particles and filter efficiency. The dust collection ability is higher than that of ordinary fibers. Therefore, P84 fiber is widely used as a high-temperature filter material, suitable for dust removal of flue gas whose temperature does not exceed 260°C. It can meet most of the related industrial dust removal processes (such as garbage incineration plants, cement plants, coal-fired boilers, etc.) with a working temperature range of 100~260℃. Patent CN201171942Y1 has invented a hybrid filter needle felt, which is made of P84 fiber and polytetrafluoroethylene (PTEF) mixed adhesion layer attached to the inner and outer sides of the PTEF base fabric. The advantages of high humidity, corrosion resistance and high filtration precision. CN201101921y2 discloses a needle-punched filter felt with a polyimide fiber surface layer, a dust-receiving layer formed by P84 fibers, a first adhesion layer formed by polyphenylene sulfide (PS) fibers, a PPS short yarn base cloth or a PEF filament base cloth The base fabric layer is constituted, and P constitutes the second adhesion layer. The filter felt uses a dense P84 fiber layer as the outermost layer, and directly contacts with dust to improve the filtration accuracy of the filter material, reduce the pressure difference of the filter material, increase the service life of the filter material, and control the flue gas emission concentration to be less than 30mg/Nm3, Reduce the energy consumption and operating cost of the dust collector. However, the wear resistance of the above two needled filter felts is poor. Patent CN102350131A3 covers the upper and lower surfaces of the glass fiber base cloth with a mixed needled felt of glass fiber Kevlar fiber and P84 fiber, and the composite fiber layer on the upper and lower surfaces of the base cloth and the base cloth After acupuncture and 



combined with PFE emulsion permeable film treatment, the obtained glass fiber polyimide composite filter material has a continuous temperature resistance of 280 ℃, and the abrasion resistance is improved. In addition, spunlace felt is also an effective method for preparing high-temperature filter materials. Compared with the traditional needle punching process, the flexible entanglement of the spunlace process increases the strength of the base fabric and fibers in the composite filter material, and ultimately improves the product Strong. Patent CN202096830U4 discloses a P84 composite spunlace felt, that is, the upper and lower sides of the glass fiber base cloth are symmetrically injected with high-pressure water into the mixed fiber layer, and then high-pressure water is injected into the mixed fiber layer on the surface layer. P84 superfine fiber layer, the felt material is strong and has high filtration accuracy. Patent CN201899980315 invented a PTEF and polyimide fiber spunlace composite filter felt, that is, on the upper and lower sides of the basalt fiber base fabric, symmetrically use high-pressure water jets to adhere the PTEF and P84 mixed short fiber layer, and in the short fiber layer Covered with a PTFE latex impregnation layer, the filter felt is suitable for dust removal of generator sets with various temperature, humidity and water content. On this basis, the patent CN201969432U uses two processes of spunlace and needle punching to prepare a polyimide fiber hybrid membrane filter felt. Layer PTE microporous membrane, the polyimide hybrid filter felt has good water resistance. Patent CN202860286U discloses a polyimide glass fiber composite filter material with a skin-core structure, wherein the glass fiber is the core layer and the polyimide fiber is the skin layer. The filter material combines glass fiber and polyimide. The material has the advantages of lightness and toughness, high temperature resistance, chemical corrosion resistance, low price, and good filtering effect.

ferrite sheet:https://www.goodsmaterial.com/

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