Claims
- 1. In an electrostatic precipitator having an alternating source signal and a rapper for removing precipitate from a collecting surface, method for preventing magnetization of the rapper, comprising the steps of:
- (a) first rectifying the alternating source signal to provide a plurality of pulses of a first polarity and applying the plurality of first polarity pulses to the rapper; and,
- (b) second rectifying the alternating source signal to provide a plurality pulses of a second polarity and applying the plurality of second polarity pulses to the rapper whereby the magnetization of the rapper caused by applying the first polarity pulses is substantially canceled by the second polarity pulses.
- 2. The method of claim 1 wherein the first and second pluralities each includes a series of full half-cycle pulses and a single pulse of diminished conduction angle.
- 3. The method of claim 1 comprising the further steps of:
- sensing the magnitude of current of the pulses applied to the rapper; and,
- adjusting the duration of application of the pulses in accordance with the sensed magnitude for applying a predetermined level of energy to the rapper.
Parent Case Info
This application is a division, of application Ser. No. 07/207,778, filed June 16, 1988 now U.S. Pat. No. 4,928,456.
US Referenced Citations (6)
Divisions (1)
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Number |
Date |
Country |
Parent |
207778 |
Jun 1988 |
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