Observation of the process of dust accumulation on a rigid ceramic filter surface and the mechanism of cleaning dust from the filter surface

The accumulation process of captured particles on the surface of a rigid fi lter element is experimentally studied by measuring the pressure drop. It i s then related to the packing density of the dust layer. The process of the release of dust from filter surface is also studied through the changes in the pressure difference across the filter and the movement of the released dust after clean air is injected, As a result, for a given filtration cond ition, dust forms the densest layer at the initial and the loosest at the m iddle stage of the filtration, and forms a uniform layer at the final stage . The cleaning efficiency of the dust layer is found to depend upon the lay er structure, i.e. it decreases: as dust forms a denser layer, even if the accumulated mass per unit filter surface area is the same, The release velo city of dust from the surface is also found to become slower as the porosit y of the layer decreases.