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Filter dust removal device comprises a bag type dust collector and granular layer dust removal, the former usually use organic fiber and inorganic fiber fabric made of bag filter layer, filter layer and the latter with different diameter particles, such as quartz sand, river sand, ceramsite, slag, etc. composition. With powder repeated attached to the outer surface of the bag, powder layer continuous thickening, bag type dust collector resistance value increases; pulse valve diaphragm issued a directive, around submerged pulse valve is open, high pressure gas within the package of compressed air through the, if there is no dust or is small to a certain extent the, mechanical cleaning ash work will stop working.