Application and advantages of PTFE (polytetrafluoroethylene) coated needle felt filter material in current ultra clean emission. PTFE coated needle felt filter material has its unique advantages in controlling dust emission, especially PM2.5 emission, and the dust emission is stably controlled below 10mgm2. At the same time, due to the small friction coefficient on the surface of PTFE microporous membrane and not easy to stick ash, the dust layer on the surface of the filter material is easy to fall off, which greatly reduces the possibility of blockage of the filter material, which greatly slows down the rising speed of the resistance of the filter material and effectively reduces the operation resistance of the dust removal equipment. It not only solves the high-efficiency dust removal that the conventional filter material does not have, but also improves the dust removal efficiency on the surface of the filter material. It has a wide application prospect in ultra clean emission. We should choose not only high-quality ptfe filter cloth but also a leadingptfe filter cloth manufacturer.
Bag dust removal technology is a widely used high-efficiency dust removal technology. However, due to the proposal of ultra clean emission, the traditional bag dust collector cannot meet the new emission standard. With the emergence of PTFE coated needle felt filter material; the bag dust removal efficiency has been greatly improved. The pore diameter of membrane covered filter material is 0.3-0.5 μ M can intercept very fine particles, and high dust removal efficiency can be achieved only by surface filtration. Moreover, the film surface is smooth, and the dust can peel off naturally without forming a thick dust layer, which greatly reduces the number of dust removal.
Membrane covering of filter material refers to a processing technology of coating a layer of polytetrafluoroethylene (PTFE) microporous membrane on the dust facing surface of conventional needle felt filter material through high temperature technology. PTFE microporous membrane is made of dispersed polytetrafluoroethylene resin by special process. Its surface is three-dimensional network, cross microporous structure and no through holes. It has the advantages of small pore size, high pore limit, smooth surface, low friction coefficient, good dry resistance, good chemical resistance and wide temperature range (- 180 ℃ ~ 260 ℃).
There are many types of conventional needle felt filter materials. In the process of dust filtration, the dust is easy to adhere to the surface of the dust removal filter bag. When using compressed air for dust cleaning, the dust layer is not easy to fall off and clean-up, which is a common defect of conventional filter materials. With the continuous increase of the amount of treated flue gas, fine particles gradually penetrate into the internal fiber gap of the needled felt filter material through the pores on the surface of the needled felt filter material, and form a powder layer on the surface of the needled felt filter material. With the formation of the powder layer, the filtration efficiency begins to rise, which is the beginning of truly effective filtration. In other words, the filtration function of the conventional needle felt filter material is mainly realized by the interception of the powder layer formed on the surface of the filter material.