Filter material for coal-fired boilers and preparation method thereof

Abstract

The invention discloses a filter material for coal-fired boilers and a preparation method thereof, which relates to a filter material for the flue gas purification of coal-fired boilers. The invention provides a filter material for coal-fired boilers and a preparation method thereof, wherein the filter material is applicable to the flue gas purification of coal-fired boilers in various bad working conditions. The filter material for coal-fired boilers is provided with a base fabric layer, the two sides of the base fabric layer are respectively provided with a dust-facing surface fiber filter layer and a net gas surface fiber filter layer. After different blending ratios are selected, corresponding fibers are subjected to opening and uniform mixing in mass ratio, and in the process of mixing, a situation that the density of PTFE fiber is greater than the density of PPS or PI is fully considered, and the fibers are respectively subjected to machine mixing, artificial mixing and machine mixing. After uniformly mixed, the fibers are subjected to routine processes which comprise a fiber carding, fiber web forming, cross net laying, drafting, pre-needling, needling and post-processing.

Description

technical field [0001] The present invention relates to a filter material for flue gas purification of coal-fired boilers, in particular to a coal-fired boiler that can adapt to various harsh flue gas working conditions such as high sulfur, high nitrogen, high oxygen, and ultra-high temperature, and realize long life Filter material and its preparation method. Background technique [0002] With the country's increasing environmental protection requirements, the application of electric bag composite dust removal technology in the field of coal-fired boiler smoke and dust control has been rapidly and widely promoted. In just a few years, nearly 400 sets of electric bag composite dust collectors have been put into operation. . Before 2008, because manufacturers in the industry did not fully understand the flue gas conditions of coal-fired boilers, people generally chose PPS (polyphenylene sulfide) filter materials with excellent cost performance. However, engineering practice...

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Problems solved by technology

However, the above invention has the following disadvantages: ①According to experimental research and engineering practice, the ozone content in the electric bag composite dust collector is very small, which is not enough to affect the service life of the PPS filter material, that is, the problem object mainly solved by this patent does not meet the reality; ② In this invention, it is stated that the longitudinal and transverse fracture strength of the composite filter material is more than 1200N / 5×20cm. Actually, because the longitudinal and transverse fracture strength of PTFE fiber is lower than that of PPS, the actual fracture strength after compounding is generally 700~1000N / 5×20cm , that is, the data provided by this patent does not conform to the actual situation; ③ this invention does not solve the problem of which filter material should be selected under high-temperature and harsh flue gas conditions; ④ this invention only shows that in composite fibers, PTFE content of 30% to 70% can satisfy performance

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