Reverse flow cleaning

Fabric-filter designs fall into three types, depending on the method of cleaning used (1) shaker-cleaned, (2) reverse-flow-cleaned, and (3) reverse-pulse-cleaned. 

Reverse-flow-cleaned filters are similar to the shaker-cleaned design, except the shaker mechanism is eliminated. As with shaker-cleaned filters, compartments are taken off-line sequentially for cleaning. The primary use of reverse-flow cleaning is in units using fiberglass-fabric bags at temperatures above 150°C (300°F). 

Most applications that use the reverse-flow cleaning system use ambient air as the primary supply of clean gas. 

Pneumatic cleaning with low-pressure air (reverse flow cleaning of bag filters with cleaned air or gas supplied by a purging air fan), medium-pressure air (supplied in a pulsating flow) and high-pressure air (pulsed compressed air jet cleaning system). 

Most applications that use the reverse-flow cleaning system use ambient air as the primary supply of clean gas. A large fan or blower draws ambient air into the clean side of the filter bags. However, unless inlet filters properly condition the air, it may contain excessive dirt loads that can affect the bag life and efficiency of the dust-coUection system. 

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