ABSTRACT
Fabric filter collectors, or baghouses, separate particulate from gas stream by causing the particulate to pass through a filtering medium, a layer of previously collected (or purposely deposited) particulate, or both. The gas-borne particulate is intercepted by the fibers of the filtering medium, by the particulate already present on the medium surface, or both. To prevent excessive pressure drop as the particulate accumulates, these devices use various mechanisms to disengage the particulate from the medium.
There are three basic dust collector applications. Nuisance or fugitive dust collection from the venting of conveyors, transfer points, packing stations and so on-this dust is often sent to waste. Next is product collection venting of classifiers, crushers, storage bins, air (pneumatic) conveying systems, mills, and flash dryers. This dust is often recovered because it has value. Last is process gas filtration venting of spray dryers, kilns, power boilers, reactors, and so on. The collected solids may or may not be returned to the process. This dust may or may not be worth recovering but must be controlled for environmental or workplace health reasons.
