In a pulse-jet baghouse, felted filters are typically used as bag material (although woven fabrics can also be used). Since there are no openings in the fabric material, there is no initial cake buildup period. Effective filtration begins immediately as the dust is filtered by the bag. The performance curve of a pulse-jet bag (or row of bags) is given in Figure 1. The pressure drop across the bags is slightly higher than with woven filters. The baghouse is usually operated with pressure drops of 4 to 6 in. of H2O and occasionally as high as 10 in. of H2O. In a pulse-jet baghouse one row of bags is cleaned at a time. Some of the dust is knocked off the bags being cleaned while adjacent rows are still filtering. Bag cleaning cycles are initiated to keep the overall pressure drop across the baghouse within the designed range. If off-line cleaning is used, a compartment is taken out of service and bag cleaning is initiated in that compartment (module).
Figure 1. Performance curve of a pulse-jet bag or a row of bags
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