NOVEL ESP MODEL FOR IMPULSE ENERGISATION

Recently more and more electrostatic precipitator has been upgraded, replacing the traditional DC power supply with impulse energisation. Different types of supply voltage were applied to obtain current impulses for reducing back corona, earning energy saving and better efficiency of precipitation. For the evaluation of the effect of impulse energisation, several numerical models were made using different computational methods. A large number of models calculate ion space charge density distribution assuming continuous ionic current between high voltage and grounded electrodes. This assumption can lead to incorrect result when the “travelling time ” of the ions and the time period of the supply voltage (duration of the current impulses and “current free” periods) are in the same range. Our new model for the ion space charge density calculation takes into consideration the rapid, time dependent processes providing more reliable results for the evaluation of the precipitation process. By the help of the new model a detailed analysis of different supply modes can be carried out, to obtain the best possible operation of a given electrostatic precipitator