The Dust Cleaning Mechanism of a Pulse Jet Type Bag Filter

The dust cleaning mechanism of a pulse jet-type bag filter was experimentally investigated using various types of plane fabric filters. The time change of pressures up and downstream of the filter, and the displacements of the filter and dust surface were measured in order to relate their characteristics to the dust cleaning. Using a high speed video camera, the dust cleaning process was observed.As a result, the rapid inversion of pressures up and downstream of the filter and its inflation are found to be essential to enhance the dust removal as well as the dust detachability of the filter surface. The instance at which the dust layer separates from the filter surface was related to the difference between the displacements of the filter and the dust surface. It is revealed that the cracking of the dust cake takes place after the separation. The size of separated dust fragments seems to be larger for higher dust detachability, and a schematic model for the dust cleaning process is proposed based on these results.