Working principle of bag filter in cement plant

The working principle of the bag filter in cement plant is: dust-containing gas enters the middle and lower boxes from the air inlet of the dust collector, and enters the upper box through the filter bag. Due to the various effects of the filter bag, the dust and gas are separated. The dust is adsorbed on the filter bag, and the gas passes through the filter bag and enters the upper box through the venturi, and is discharged from the air outlet. In the process of purifying dust-containing gas through the filter bag, as time increases, more and more dust accumulates on the filter bag, so the resistance of the filter bag gradually increases, and the amount of gas passing through the filter bag gradually decreases. In order for the dust collector to work normally, the resistance must be controlled within a limited range (usually 120 to 150 mm water column). In this way, when the resistance rises to the limited range, the controller will issue instructions to trigger the control valves in order, open the pulse valve, and the compressed air in the air bag will be sprayed into the corresponding filter bags from the holes of the blowing pipe through the venturi. The filter bag expands sharply under the momentary reverse action of the airflow, so that the dust accumulated on the surface of the filter bag falls off, the filter bag is regenerated, and the cleaned dust falls into the ash hopper and is discharged from the body through the ash discharge system. Because the dust accumulated on the filter bag is regularly removed, the purified gas passes through normally, and the dust collector works normally.