Abstract
A bag filter is an apparatus that collects and recovers dust particles floating in a gas phase. The performance of a bag filter is expressed with pressure drop and collection efficiency. The pressure drop after cleaning operation has been discussed with two models, the uniformed cleaning model that dust particles on a filter cloth are cleaned uniformly and the patched cleaning model that the filter cloth consists of surface area where dust particles remain and the other surface area where the dust is perfectly cleaned. The latter model expresses well the pressure drop observed.
In this work the collection efficiency with the two models were compared to the experimental results. The amount of the penetrative dust through the filter was measured by electrostatic capacity method and was estimated by numerical simulation with the two models. In the experiment, the impulse peak of the penetrative dust amount was observed just after the cleaning operation. The uniformed cleaning model did not reproduce the impulse peak but the patched cleaning model did, which means the patched cleaning model expresses the actual collection efficiency well.
