Generally speaking, all porous materials that can allow fluid to pass through and trap solid particles contained in the fluid to achieve the purpose of solid-liquid separation are collectively referred to as dust bag filter media. On the one hand, the filter efficiency of the dust bag is related to the structure of the filter material, and on the other hand, it also depends on the dust layer formed on the filter material. Therefore, theoretically, the highest efficiency can be achieved when the filter material is not broken. Therefore, as long as the design parameters are selected properly, the dust removal effect of the bag filter should be no problem. The key points of selecting the bag should meet the following requirements: easy to clean dust, good air permeability, temperature resistance, strong corrosion resistance, etc.