The bag filter is composed of a box body, a filter bag (including a frame), a dust removal device, an ash bucket and a dust removal device.

As shown in the figure, there are many filter bags suspended in the box. After the dust-containing gas enters the dust collector, the dust is trapped on the outer surface of the filter bag through the filter bags installed side by side, and the purified gas is discharged from the outlet of the dust collector. As dust accumulates on the filter bag, the resistance of dust-laden gas through the filter bag will increase accordingly. When the resistance reaches a certain value, the dust removal device is used to discharge the dust from the dust collector to achieve dust removal.