Filter material and purpose thereof

Abstract

The invention discloses a filter material and a purpose thereof. The filter material consists of three layers of structures, namely, a filtering surface layer, a non-filtering surface layer and an intermediate fabric enhancing layer. The filtering surface layer is a fiber web that consists of 20-80wt% heat resistance fibers of which the diameter is less than or equal to 10mum and 20-80wt% heat resistance fibers of which the diameter is more than 10mum and less than or equal to 20mum in a layering manner, wherein the fibers of which the diameter is less than or equal to 10mum is used as an upper layer; the non-filtering surface layer is a fiber web which consists of heat resistance fibers with special-shaped sections, the diameter of which is 10-200mum; and the intermediate fabric enhancing layer consists of heat resistance fibers. The filter material has the effects that the filtering performance is good, the mechanical strength is high, the loss of pressure is less, and the cycle time is long, and has the advanatage that the service life of the filter material can be prolonged.

Description

Technical field [0001] The invention relates to a filter material and its use. Background technique [0002] In recent years, with the rapid development of industry, industrial pollution has become increasingly serious, which has endangered the natural environment and people's health. Flue gas dust removal is an important part of pollution control, and bag dust removal is an effective method of flue gas treatment. In 2007, the Bag Filter Committee of the China Environmental Protection Industry Association promulgated a new national standard for bag filter materials and filter bags. The emission requirements of coal boiler flue gas have become stricter and require higher collection efficiency. The application environment of the filter material is four high and one low (the exhaust gas temperature is high, the SO in the flue gas is high) 2 , NO X , O 2 High content; high dust concentration; low resistance of filter material required for renovation projects) Due to the poor flue ga...

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Problems solved by technology

The filter surface layer uses the special trilobal cross-section of polyimide fiber. Its stable chemical properties can improve the filtration accuracy and dust collection capacity of the filter material, but the non-filter surface layer uses conventional polystyrene with a fineness of 2-4D. Sulfur ether makes the fibers in the fiber net compactly arranged, which will cause low air permeability and large pressure loss, which will affect the service life of the filter material

[0005] In the publication number CN1712100 patent, a kind of three-gradient high-density surface layer filter material manufacturing method is proposed. The coarse fiber is used as the lower net, the fine fiber is used as the upper net, and the superfine fiber net is superimposed on the outer layer of the fine fiber to form the filter material, so that the filter material has a relatively high density. High filtering effect, good peeling effect, and low manufacturing cost, but the resistance of the filter material increases, and the proportion of each component fiber is not explained, it is difficult to control the effect, especially the proportion of superfine fibers is too high, the filter felt The pressure loss will be relatively high, and the air permeability will be small, which will reduce the cleaning interval of the filter felt, and the increase in the number of pulses will reduce the mechanical properties of the filter felt, thereby shortening the service life

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