Filter element and preparation method and application thereof

Abstract

The invention provides a filter element and its preparation method and application. The preparation method includes first mixing ceramic fibers, binder sol and dispersant to form a slurry, then adding a modifier to the slurry to form a raw material mixture, injecting the raw material mixture into a mold for molding, demoulding, drying and calcining, The matrix is ​​obtained; the matrix is ​​installed in a filter, and low-melting particles are added upstream of the filtration for filtration, until the pressure drop of the filter rises to 1.25-4 times the initial pressure drop, and the addition of low-melting particles is stopped, The filtered matrix is ​​taken out and calcined to obtain the filter element. The present invention also provides a filter element obtained by the above preparation method. The present invention further provides the application of the above filter element in high temperature gas filtration and dust removal. The above-mentioned filter element provided by the present invention has the characteristics of high temperature resistance, high filtering efficiency, good dust removal effect and the like.

Description

technical field [0001] The invention relates to the technical field of high-temperature gas purification, in particular to a filter element used for filtering and dedusting high-temperature gas, and a preparation method and application thereof. Background technique [0002] With the continuous improvement of environmental protection standards, high temperature gas filtration technology has attracted much attention in many industrial processes such as coal-fired power generation, biomass gasification, waste incineration and petroleum catalytic cracking. Efficiently filtering and removing dust particles from high-temperature gas can not only meet emission requirements and protect the safe operation of downstream equipment, but also improve process efficiency and product quality. In the high temperature filtration system, the filter element is the core component, and its performance directly affects the filtration performance and operating life of the filtration system. In ord...

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Problems solved by technology

[0004] At present, the existing ceramic fiber filter elements mainly have the following problems: 1. The structure is uneven, mainly because the binder is subjected to capillary force, concentration gradient and thermal diffusion in the drying stage to both sides of the filter element in the thickness direction. Surface migration, resulting in more binder content at the edges of both sides, and less content in the middle part, this uneven structure leads to a decrease in component strength; secondly, there are binders that are easy to agglomerate and exist in the internal pores of the component Excessive useless binder leads to the problem of reduced porosity of the element; 2. The large pore size and uneven distribution on the surface of the filter element is also an important defect, which leads to the uneven residual dust layer formed after the filter blowback cycle, There is a "cavity" structure, which causes fine dust to continuously deposit inside the fiber element and penetrate the element, resulting in an increase in the concentration of downstream dust particles. Therefore, it is necessary to modify the pore size of the surface of the air inlet side of the element

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