Method of controlling operation of an electrostatic precipitator
First Claim
1. A method of controlling the DC-voltage in an electrostatic precipitator having electrodes energized by pulses superimposed upon a preset DC-voltage, which comprises:
- periodically eliminating said pulses and thereafter measuring a corona discharge current between said electrodes;
comparing said measured corona discharge current against a predetermined value; and
selectively adjusting the DC-voltage in accordance with said measured corona discharge current so as to maintain the DC-voltage at approximately the corona extinction voltage by increasing the DC-voltage when the measured discharge current is lower than said predetermined value and by decreasing the DC-voltage when the measured discharge current is higher than said predetermined value.
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Accused Products
Abstract
A method is disclosed for controlling the DC voltage of an electrostatic precipitator having electrodes energized by a preset DC voltage in which the preset DC voltage has pulses superimposed thereon. According to the method, the pulses are periodically turned off. Thereafter, the corona discharge current caused by the DC voltage is measured and compared against a preset value. Thereafter, the DC voltage is adjusted in dependence upon the measured corona discharge current by it being increased or decreased depending upon whether the discharge current is lower or higher than the preset value.
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Citations
26 Claims
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1. A method of controlling the DC-voltage in an electrostatic precipitator having electrodes energized by pulses superimposed upon a preset DC-voltage, which comprises:
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periodically eliminating said pulses and thereafter measuring a corona discharge current between said electrodes; comparing said measured corona discharge current against a predetermined value; and selectively adjusting the DC-voltage in accordance with said measured corona discharge current so as to maintain the DC-voltage at approximately the corona extinction voltage by increasing the DC-voltage when the measured discharge current is lower than said predetermined value and by decreasing the DC-voltage when the measured discharge current is higher than said predetermined value. - View Dependent Claims (2, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 24, 25, 26)
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- 3. The method according to claim 3 wherein the decrease of the original DC-value due to the controlling is made by a preselected discrete value.
Specification