The effect of a collected flyash layer on electrostatic precipitator (ESP) behavior is investigated. Dust layer and back corona effects are combined with a previously developed model of pulse energized precipitation to simulate experimental measurements. To obtain reproducible results and sizehyphen;specific efficiencies in the presence of a flyash layer required the use of entrained model particles and carefully controlled humidity. Differences between empirical model parameters obtained here and values derived from other experiments suggest that electrical sneakage is a significant mechanism; extension of the model to accommodate this sneakage is discussed. Physical explanations are given for the efficiency maxima and minima with pulse rate variation that are exhibited by the model, and the implications for pulser control are discussed. It is concluded that the model has been developed to such a stage as to permit its utilization for the design of pulsed ESP supplies and controllers.
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