Dust Control Handbook for Industrial Minerals Mining and Processing

Figure 1.17. Typical design of a mechanical shaker dust collector.When using mechanical shakers, a number of recommendations should be followed:Magnehelic gauges should be installed on each compartment to monitor differentialpressures during the cleaning cycles.Differential pressures should be as close as possible to 0.0 inches wg to ensure that thedust cake breaks and is released from the bags. Differential pressures above 1/4-inch wgduring the cleaning cycle will dramatically interfere with bag reconditioning, which canlead to reduced airflow, high static pressures, and low bag life.Bags should only be shaken when differential pressures across a section of bags haveincreased by 1/2-inch wg.Experiments to determine the optimum time interval between the shaking of bags shouldbe performed so that bags are not shaken excessively. This also lessens wear on the bagsas well as the mechanical parts.Fundamentals of Dust Collection Systems 35