The main advantage of baghouse has: (a) high collection efficiency, especially for fine dust have higher efficiency, generally for more than 5μm dust purification rate of more than 99%; (b) strong adaptability. Different properties can trap dust. For example, the high resistivity dust, using baghouse is superior to the electrostatic precipitator. In addition, the entrance dust concentration in a relatively large range, using baghouse was better; (c) the use of flexible, air volume vary from a few cubic meters per hour to several million cubic meters. m;. (d) simple structure, local conditions using simple bag filter, or the use of more efficient pulse jet baghouse; (e) stable, dust easily recycled, no sludge treatment, corrosion of the body. and other issues, and simple maintenance.