Envelop Filters: Description and Operation
Envelope filters are units designed for the retention of solid particles while allowing the passage of fluid through the filter medium. The process is typically carried out intermittently, allowing for cleaning of the filter medium during pauses.
Contaminated air is drawn into the feeding hopper, where heavier particles settle and separate from the air stream, accumulating at the base of the system. Finer particles are carried by the fluid through the filter medium, where they accumulate on its inner surface. The clean air that surpasses the filter medium is drawn by an extractor and discharged into the atmosphere.
A wide variety of fabrics or felts with different permeabilities are used as filter media, which define the quality of the recovered air. The filtering surface is designed in a rectangular shape, as it is the most effective way to dislodge dust and ensure thorough system cleaning and uninterrupted operation. It is precisely this design that gives it the name "envelop filter."
Cleaning Procedure for Envelope Filters
The dust retained on the inner surface of the envelope filters remains in place until the extractor is turned off. At that moment, heavier particles can spontaneously fall due to gravity, while lighter ones remain adhered to the filter medium. To facilitate the separation of these particles, mechanical or manual agitation can be employed to release them into the discharge hopper.
The mechanical cleaning system vibrates the support frame of the filtration units, dislodging the internal dust and allowing it to fall into the collection hopper. Once clean, the system is ready to continue its operation. Depending on the system's capacity and the particle concentration in the fluid, the cleaning cycle can be shortened to a few hours.
Acquire envelope filters for your processes from the Foeth catalog! If you need additional information about our bag filters, please call or contact us directly!