Cartridge Dust Collectors (Overview)
CARTRIDGE – The most significant characteristic of dust filter cartridges is that they are designed to take up less space than panel or bag-type filters with identical surface areas. They are typically cylindrical in shape, with the media folded into corrugations and provided with a sealed bottom. Air is sucked through an opening in a flat steel panel known as a “tube sheet” and, thus, from within the cartridge (through its open top) that is tightly sealed against it to prevent leakage of suction airflow. As dust-laden air is drawn into the collector housing, it flows into the cartridge through its filter media, leaving its dust on the outer cartridge surface. In most systems, compressed air is periodically released as a high-pressure “pulse” into the body of the cartridge so that it “shocks” the media. This shock causes the agglomerated dust “cake” that has gradually accumulated on the outer cartridge (media) surface to release. Its (now) greater mass allows it fall against the direction of flow of the slowly- moving dust-laden air entering the collector and to accumulate in the bottom of the collector housing. By sequentially pulsing cartridges with relatively small volumes of air, either individually or groups, the inward flow of dust-laden air onto those not being “pulsed” is not interrupted and the continuous function of the collection process is not affected. Various materials are available for use as cartridge media and are selected to match various characteristics of dust to be collected.