The formation of filter cake helps to improve remove dust Efficiency, but it will also increase the pressure loss. The influence of filter cake on pressure loss depends on the thickness of filter cake and the specific resistance coefficient of dust. When the pressure loss reaches the limit value due to the thickening of filter cake, the filter cake must be removed. There are many methods, but they all belong to the two major categories of rapping and countercurrent back blowing. The filtercake is a layer of compacted particles, the cake is expected to have a lower porrsity and permeability than the porous rock itself
