Working principle of PPC60-4 pulse jet bag type dust collector The dust collector is composed of ash hopper, upper box, middle box, lower box, etc. The upper, middle and lower boxes are divided into chambers. During operation, the dusty gas enters the ash hopper through the air inlet duct, the coarse dust particles fall directly into the bottom of the ash hopper, the fine dust particles enter the middle and lower boxes upward with the air flow turning, and the dust accumulates on the outer surface of the filter bag after filtering