Experimental study of pleated cartridge filters in a pulsejet-cleaned dust collector

Six pleated filter cartridges with different base media and geometrical dimensions were tested in a full-size dust collector cleaned by reverse-flow pulse jet technique. The evaluation was performed under two different cleaning modes, i.e., Clean-On-Demand and Clean-On-Time. The filter cartridge performance was compared for effective residual pressure drop and downstream particle concentration of filters. The results show that the pleat ratio, defined as the ratio of pleat height to pleat pitch, has a great effect on the operational mode for cleaning the filter cartridge. Clean-On-Time mode shows better performance on filters of high pleat ratios, while Clean-On-Demand mode better for filters of low pleat ratios. Similar to the cases for flat-sheet filter bags, the tank pressure is critical for cleaning pleated filter cartridges, and the pulse duration has little effect on the cleaning efficiency. With the same base media, filters with the surface treatment are superior to those without. The particle concentration during the pulse-jet cleaning is at lease two times of that during filtration process for all pleated filter cartridges tested. The downstream particle concentration is however independent of the applied cleaning mode and cleaning intensity.