Influence of pulse-jet cleaning pressure on performance of compact dust collector with pleated filter operated in clean-on-time mode

Abstract

• Accumulation structure of residual dust particles was studied for a filter medium. • Different pulse-jet pressures were considered, and a simple model was used. • Filter performance was studied by analyzing the dust accumulation structure. • The effective ratio of filtration area increased with pulse-jet pressure. • The dust penetration increased with pulse-jet pressure. To operate a bag filter continuously, pulse-jet cleaning of dust particles from the filter medium is commonly required, and the pulse-jet pressure significantly affects the filter performance. In this study, the accumulation structure of residual dust particles inside and on the surface of a filter medium at different pulse-jet pressures was investigated by constructing a simple model, and the influence of the dust structure on the filter performance was clarified. Using a simple model, we determined the effective ratio of filtration area β , which represents the ratio of the filterable area to the total filtration area, the true resistance coefficient due to the primary dust layer ζ p ’ thinly deposited on the filter surface, and the true resistance coefficient inside the filter media itself ζ f ’ . The effective ratio of filtration area β decreased with operation time for all pulse-jet pressures; however, it maintained a high value when the pulse-jet pressure was high. The validity of β analyzed by the model was verified using two different methods, and the results showed good agreement, indicating that the model is effective in identifying real conditions. The true resistance coefficient due to the primary dust layer ζ p ’ decreased as the pulse-jet pressure increased; however, the true resistance coefficient inside the filter media itself ζ f ’ was the highest at 0.5 MPa. In addition, the dust collection efficiency was different at each pulse-jet pressure, which was considered to be caused by the difference in the dust particle accumulation structure.