Back corona in deposited dust layer of collecting electrode in precipitation, which decreases flash-over voltage, as well as increases working space current, not only makes dust-collecting efficiency reduced obviously, but also influences steady operation of static dust precipitator tremendously. Back corona becomes one of the obstacles baffling dust-collecting stable operation. Starting from resistance-capacitance model, this paper tried to present instantaneous voltage equation in surface of dust layer. Also starting from increasing process of dust layer, this paper gave charge density instantaneous equation in dust layer and discussed the influence factors to back corona.
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