What caused high running resistance to bag filter?

The bag filter is a kind of dust removal and purification equipment that uses filter bag material to filter dust-containing gas. It has the characteristics of dust removal, simple structure, strong adaptability, and stable operation. It is widely used in metallurgy, thermal power generation, cement manufacturing and other industries. However, in the production process, the running resistance of the equipment is often high, which leads to the reduction of dust removal efficiency and shortening of the life of the filter bag. When the running resistance of a bag filter exceeds 1500Pa, we can qualitatively say that the running resistance of this filter is on the high side. When the operating resistance of the bag filter exceeds 2000Pa, it will have a greater impact on the ventilation of the entire system.

The running resistance of the dust collector is caused by three parts: the body, the dust filter bag and the dust adsorbed on the filter bag. Factors such as structural design differences, needle filter felt, filter wind speed, gas dust concentration, dust particle size, and gas humidity have a greater impact on the operating resistance of the dust collector.

The structural design includes the cross section of the inlet and outlet air ducts, the air equalization device of the large-bag dust collector, the cross-sectional dimensions of each part through which the air flows, and the design of air lock, inspection door sealing, and equipment insulation. Unreasonable structural design will make the equipment running resistance higher. Reasonable structural design has a body resistance of about 400Pa. The author recommends that the wind speed of the inlet and outlet ducts should be less than 15m/s, preferably about 10m/s. The wind speed of the inlet and outlet air branch pipes of each bag room should be less than 10m/s, which is beneficial to uniform wind and reduces resistance.