About how to improve the bag filter baghouse dust filtration velocity level of efficiency, depending on the thickness of the filter bag and the dust layer. In general, the media dense dust layer thickness, the efficiency is high; but reduces the corresponding processing gas capacity, which is the filtration velocity decreases. So, how can while ensuring high efficiency and stable filter pressure loss, but also can improve the filtration velocity? Filtering improves wind speed, depending on the cleaning method and filter performance. Early baghouse dust bag room and used without cleaning device, filtration velocity is low gas processing capacity is low. Later, with the artificial method to clear the dust adsorbed on the bag, the filtration velocity increased; in turn developed into compartment intermittently rapping regular automatic cleaning bag filter, which is mechanical rapping, inverse and inverse airflow stream vibrating baghouse filtration wind speed increased significantly. However, due to the use of gas to be processed by cutting chamber, each chamber sequentially carried bag cleaning method, dust not fully functional. In recent years there has been cleaning bag filter with advanced equipment, such as pulse jet bag filter is one of them. Pulse bag filter is not cut off by the case of process gas, for continuous cleaning bag, the pressure loss and dust precipitator operation amount of gas to be treated almost unchanged. After cleaning and the use of efficient use of compressed air bag, filtration velocity of 5 m / min. It and mechanical rapping cleaning bag filter, compared with a large gas processing capacity, long bag life, high collection efficiency and maintenance efficiency and other advantages.