In multicompartment baghouses where the various compartments are cleaned one at a time, the performance curve takes on a different shape. In this case the change in the curve is less pronounced than in Figure 1. The performance curve has a slight saw tooth shape for the net pressure drop across the entire baghouse (Figure 2). Each of the minimum points on the curve represents the cleaning of an entire compartment. The average pressure drop would be represented by the dotted line. For optimum filtration rate and collection efficiency, the baghouse should be designed to operate at a pressure drop that approaches a constant value. This involves careful selection of fabrics and cleaning mechanisms for the baghouse. The weave, and any pretreatment of the fabric can affect the cake repair time. Poor cleaning will increase the filter drag; therefore, the bags must be thoroughly cleaned to reduce the filter drag effect. If cake repair time can be minimized, the pressure drop will be lower. Consequently, the effective filtration rate will be longer for optimum filtering use.
Figure 1. Performance curve for a single woven bag
Figure 2. Overall pressure drop of a multi-compartment baghouse
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