Filter material and use

Abstract

The invention discloses a filter material and application thereof. The filter material has a three-layer structure, namely, a filter surface layer, an unfilterable surface layer and a middle fabric reinforced layer, wherein the filter surface layer is a fiber net formed by mixing 10 to 90 weight percent of heat resistant fiber of which the average diameter is below 10 mu m, and 10 to 90 weight percent of the heat resistant fiber of which is the average diameter between 10 and 20 mu m; the unfilterable surface layer is the fiber net formed by the heat resistant fiber of which the average diameter is between 10 and 20 mu m; and the middle layer is a fabric reinforced layer. The filter material has the advantages of high dust collecting efficiency, small raise of pressure loss after the dust on the surface of the filter material is removed, and prolonged service life of the filter material because damage of the filter material caused by blowing times of compressed air is reduced due to long dust cleaning period. The filter material can be used for preparing filter bags and the like.

Description

Technical field: [0001] The invention relates to a filter material and its application. Background technique: [0002] With the continuous development of our country's society and economy and the continuous improvement of people's living standards, people's requirements for the quality of the atmospheric environment will become higher and higher. In order to control the emission of air pollutants from coal-fired power plants, protect the living and ecological environment, and implement sustainable development In 2004, my country began to implement the newly revised national pollutant emission standards, which stipulated the emission limits of air pollutants for thermal power plants in three periods, and proposed that thermal power plants should implement sulfur dioxide and soot emissions by 2005 and 2010. Emission limits, in which the lower limits of smoke and dust emission standards are close to or meet the standards of developed countries. Moreover, this year (2007) the Bag...

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Problems solved by technology

[0006] In the publication number CN 2907835Y, glass fibers are added to the dust-facing layer (i.e. the filter surface layer) and the adhesion layer (i.e. the non-filter surface layer). Due to the poor folding resistance of the glass fiber, it is easy to break under repeated pulse cleaning. Thus affecting the service life of the filter felt; in addition, the dust layer contains ultra-fine high temperature resistant synthetic fibers and glass fibers, and the adhesion layer is a mixture of coarse fibers and glass fibers

Due to the existence of ultra-fine fibers and glass fibers, the pressure loss of the filter mat will be relatively high, and the air flow rate will be small, so that the cleaning interval of the filter felt will be reduced, and the increase in the number of pulses will reduce the mechanical properties of the filter felt, thereby shortening the service life.

[0007] Therefore, it is necessary to develop a method that can not only overcome the disadvantages of existing needle-punched filter felts that are ineffective due to the increase in resistance caused by dust easily cutting into the deep layer of the filter material, but also provide a filter material that is different from needle-punched filter felts and can achieve Needle-punched composite filter felt with surface filtration effect

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