| 摘要 |
PURPOSE:To obtain high dust collection efficiency with reduced power, by selecting an optimum charging control mode corresponding to the load state in an electric precipitator and changing the charging rate thereof. CONSTITUTION:A voltage/current characteristic detection circuit 15 inputs respective signals form detection circuits 13, 14 and calculates the voltage/current characteristic of exhaust gas every when a start signal X or a load variation signal Y is inputted. A control mode judge circuit 16 selects either one of charged voltage peak value control and the control of the product of a charged voltage peak value and an average value as a charging control mode on the basis of said characteristic value. When the charging rate of intermittent charge is increased or decreased, the change state of electrode charged voltage is detected and an order is applied to a charging stop cycle setting circuit 18 through an operation circuit 17 so as to increase or reduce the number of charging stop cycles at a definite time interval. As a result, charged voltage is always held within a predetermined voltage objective range.
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