How are fabric filter bags cleaned in a baghouse?

• A. Bags are cleaned with steam injection.
• B. Bags are periodically shaken/cleaned.
• C. Bags are replaced daily.
• D. Bags are burned off.

Answer: (B)

Keeping a baghouse effective hinges on removing the dust cake that builds up on the outside of the fabric filter bags. As flue gas passes through, dust collects and gradually blocks the pores, raising pressure drop and reducing filtration efficiency. To maintain performance, these bags are cleaned on a cycle, rather than continuously. The common approach is to shake or physically rattle the bags to loosen the accumulated dust, which then falls into a hopper. Some systems use short bursts of compressed air (pulse-jet cleaning) to accomplish the same result. The key idea is periodic cleaning to keep the bags operating properly without interrupting the process. Steam injection would risk damaging the fabric, replacing bags daily is impractical, and burning off the dust is not a method used for fabric filters.