First, the characteristics is a dry bag filter dust collector. It applies to capture small, dry, non-fibrous dust. Bag is made using a felt cloth or non-woven textiles, the use of fabric filtration of dust gas filter when the dusty gas entering the fabric filter, large particles, heavy dust, settling due to gravity down, fall into the hopper, finer dust containing gas through the filter, the dust is retained, the gas purification. Most of the new filter collection efficiency is not high enough. After the media for some time, due to sieving, collision, retention, diffusion, electrostatic and other effects, the bag surface layer of accumulated dust, this layer is called the primary layer of dust in the subsequent course of the campaign, became the primary layer filter the main filter layer, relying on the role of the primary layer, the larger mesh filter can be obtained a high filtration efficiency. With the dust has a corresponding increase in the accumulation of baghouse filter efficiency and resistance to surface, the pressure differential across the filter when large, would have been attached to some of the fine dust filter squeeze past that bag filter efficiency decreased. In addition, the air flow resistance is too high dust removal system equipment decreased significantly. Therefore, bag filter resistance reaches a certain value, to timely cleaning. When cleaning the primary layer can not be destroyed, so as not to decrease the efficiency. Second, the structure consists of portions of the upper filter box, middle box, lower box (hopper), cleaning systems and ash bodies and other components. Baghouse performance is good or bad, in addition to the correct choice of materials outside of the bag, the bag-type dust collector cleaning system plays a decisive role. To this end, the cleaning method is one of the distinguishing characteristics of baghouse, it is important also baghouse running ring. Third, the cleaning method, the gas cleaning: gas cleaning by means of high-pressure gas or external atmospheric blowback bag to remove fouling on the bag. Gas cleaning including pulse jet cleaning, anti-hair cleaning and anti-suction cleaning. 2, the mechanical rapping cleaning: divide the top and the middle of cleaning rapping rapping cleaning (both in terms of on the bag), by means of a mechanical device periodically turns rapping rapping rows bag to remove the filter fouling on bag. 3, artificial beat: each bag with artificial pat to remove fouling on the bag. Fourth, in the form of a structure, according to the shape of the dust bag is divided into: flat bag (trapezoid-shaped and flat) and a circular pocket (cylindrical). 2, according to the way into and out of the wind: the wind on down into the wind and motivated wind down the wind and DC type (only plate-flat bag). 3, according to the filter bag is divided into: the outer and inner filter type filter type. Filter fibers, cotton fibers, wool fibers, synthetic fibers and glass fibers and the like, various fibers woven into the media having different properties. Commonly used filter wheel 208 or 901 polyester flannel, temperature generally does not exceed 120 ℃, through a glass fiber filter bag silicone resin treatment, temperature generally does not exceed 250 ℃, five, merit a high collection efficiency, can catch Set size greater than 0.3 micron fine dust, dust removal efficiency up to 99%. 2, flexible, air volume can be hundreds of cubic meters per hour to hundreds of thousands of cubic meters per hour, can be set up as a direct indoor, small units near the machine can also be made of large dust chamber, the "bag house." 3, the structure is relatively simple, relatively stable operation, low initial investment (with ESP comparison), and easy maintenance. So, bag filter is widely used to eliminate dust pollution, improve the environment, recycling materials.