High-temperature resistant fiber layer composite filter material and method for preparing same

Abstract

The invention discloses a high-temperature resistant fiber layer composite filter material and a method for preparing the same. The cross section of the material adopts a triple-layer structure, the upper layer and the lower layer are both a mixed fiber layer, and the middle layer is the PTFE base fabric layer. The preparation comprises the following steps of: preparing PPS fibers and PTFE fibersfor later use; mixing two kinds of raw materials in a cotton-mixing box to obtain a preliminary mixed material; loosening the preliminary mixed material in a loosening machine; performing refined mixing of the loosened material in the cotton-mixing box; carding the refined mixing material into planar network fibers by a carding machine; spreading the planar network fibers by a lapping machine to make the mixed fiber layers; adding the PTFE base fabric layer between the two mixed fiber layers; preparing the composite fiber material by a needling machine; and putting the composite fiber material in shaping equipment for shaping, putting the composite fiber material in coating equipment for coating, and then performing surface singeing treatment to obtain the filter material. The filter material of the invention possesses high thermal stability, chemical stability, corrosion resistance and electrical property, and compared with the conventional materials, the oxidation resistance and thecorrosion resistance of the filter material are greatly improved.

Description

Technical field [0001] The invention relates to a filter material, in particular to a high temperature resistant fiber layer composite filter material and a manufacturing method thereof. Background technique [0002] The scientific name of PPS fiber Polyphenylene Sulfide (PPS) was proposed by Grenvesse in 1897, and was first industrialized by Phillips Petroleum Company in 1973. It has good thermal stability, chemical stability, corrosion resistance and Electrical properties are widely used in various industries and are known as the sixth largest engineering plastics. The needle-punched felt filter bag processed from its chopped fiber can work for a long time in a flue gas environment below 190°C and an instantaneous over-temperature of 200°C. At present, PPS fiber filter bags have become the main dust filter bags for coal-fired power plants. However, in recent years, with the changes in the use of coal raw materials in domestic coal-fired power plants and the development of dust...

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Problems solved by technology

The needle-punched felt filter bag processed from its chopped fiber can work in the flue gas environment below 190C° for a long time, and the temperature exceeds 200C° instantaneously. At present, the filter bag made of PPS fiber has become the main dust filter bag for coal-fired power plants. However, in recent years, with the change of coal raw materials used in domestic coal-fired power plants and the development and changes of dust removal equipment, more and more problems have appeared in the oxidation resistance and corrosion resistance of PPS material filter materials, which can no longer meet the needs of production. need

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