The influence of bag dust removal on dust filtration
The filter bag filter can be used fabric (plain cloth or fleece flannel), can also be rolled or acupuncture blanket. Different filter media have different dust filtration process and different influence on dust filtration efficiency. The pores in the fabric lie between the warp, woof and fiber, which accounts for 30% to 50% of the total pore size. When the dust is started, most of the air passes through the mesh between the wires and only a small fraction passes through the pores between the fibers. Then, because the thick dust particles embedded in the line between the mesh, forced through the air between the fibers increased gradually, the inertial impaction and interception effect gradually increased. Because of the adhesive force, the phenomenon of dust bridging occurred between the warp and weft meshes, and a layer of so-called "dust initial adhesion" was firstly formed on the surface of the filter. Because the particle size of dust is generally smaller than the diameter of the fiber, the screening effect on the surface of the dust primary layer is also greatly enhanced. As a result, the filter cloth becomes an effective filter material for coarse and fine dust because of the dust filtration of the surface layer of the filter cloth and the gradually deposited dust layer on it, and the dust filtering efficiency is remarkably improved.
The filter speed V (or than the load QF) is an important technical and economic index representing the capacity of the bag filter to treat gas. The selection of filtration rate should take account of economy and the requirement of filter efficiency. From the economic considerations, the filtration rate is high, with the same flow gas required filter area is small, then the size of the dust remover, the area, the steel consumption is also small, so the investment is small, but the pressure loss, power consumption, damage dust filter increases, because of high operating costs. From the aspect of dust filtration efficiency, the influence of filtration rate is remarkable. Some experiments show that the filtration rate increases by 1 times, and the dust passing rate may increase by 2 times or even more than 4 times. So the filter speed is usually expected to be lower. The filter speed of the fabric filter cloth is 0.5 ~ 2m/min, and the felt filter material is 1 ~ 5m/min. From the two aspects of economy and efficiency, this filter speed range is the most appropriate. When the filtration rate increases, it will intensify the penetration of dust particles by three ways, namely, through, extrusion and air holes, thereby reducing the dust removal efficiency.
In flannel cloth through teaseler pull scrape with fluff fabric. When the dust is filtered, the dust particles are first captured by a porous layer of fluff, and most of them are supported by a force of latitude and latitude. Subsequently, a dense and dense porous dust layer is formed on the undercoat layer. Due to the large amount of dust cloth Bisubu, so Bisubu high efficiency dust filter. Which is porous media by single fiber, disorderly deposits thicker, has the characteristics of internal filter in a certain extent. Not only the felt itself has a certain ability to filter dust, but also a large amount of dust, so even if the surface does not form a dust layer, but also to ensure a higher dust filter efficiency.
