Dust Collector Filter Bags

BCE is a world leader in air pollution control and one of the most important facets of air pollution control is the use of filter bags. BCE designs and manufactures a variety of filter bags engineered to fit nearly any situation.

The bags used in fabric filter baghouses can be manufactured for several different processes, depending on such factors as the type of fiber and the design temperature.

Most filter bags commonly encountered in pulse-jet filters are of the "needle-felt" variety. This is a textile technology where batts of short fibers are interlocked onto a backing. The traditional backing for the bag is a woven scrim. Recent technological advancements, however, have allowed some fibers to be made into "scrimless" bags, where the backing is a batt of the same fiber as the bag itself. There are some distinct advantages to having a scrimless (fiber supported) bag compared to one with a scrim:

Since the scrim does not aid in the filtering process, not all of the weight of a scrim-supported bag contributes to filtering. In a scrimless bag, all fibers, including the backing, are available for filtration.
Fiber-supported bags are stronger than those with scrims, since stitching weakens scrims, but strengthens fibers.
Fiber-supported bags are usually less expensive, since scrims typically cost more to produce than the fiber backing.
Scrims can blind if dust completely penetrates the fiber mat.
Fiber-supported bags flex better than those with scrims, providing for better pulse cleaning.

As dust-laden air passes through a bag, entrained particulates are forced into the randomly interlaced fibers in the mat and are collected when they impact on the fibers. The efficiency of a brand-new bag is low; however it increases rapidly once dust becomes trapped in the fibers, reducing permeability. In that state, a stable operating differential pressure is reached, and the actual filtration is accomplished by the dust cake, not the bag. To increase efficiency when filtering small particles, some bags are made with fine denier (i.e. smaller diameter) fibers, which provide more surface to catch particulates for a given bag weight.

Woven bags are typically used in filter types that use gentler bag cleaning than pulse-jets, such as shakers or reverse air. Woven fabrics are not as efficient as felted fabrics. Fiberglass is most commonly used as a woven, rather than felted fabric, but this material is fragile. If used in a pulse-jet filter, reduced air pressure is needed in addition to a cage with double the normal number of vertical wires, to reduce the stress on the bag from the differential pressure. Off-line cleaning is also recommended for these bags.

A number of surface treatments are available for filter fabrics. The following are desc

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