Electronic precipitator control

Details Electronic precipitator control Electronic precipitator control

1986-05-14

1989-08-22

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific quantity comparison means

361 65, 323903, 55105, 55139, H02H 326

Patent

active

048601497

ABSTRACT:
A method and apparatus for controlling power to a preciptator 27. After each spark the power to the precipitator is reduced to zero, increased along a fast ramp 15 for a fixed period of time and then increased along a slow ramp 17 until a spark occurs. The fast and slow ramp data is computed and stored (memory 48) and then retrieved after each spark. The data retrieved is the data corresponding to the firing angle at the last spark. Apparatus is provided (selector 51 and memory 52) for dividing (frequency divider 45) the retrieved slow ramp data by a number to select the number of sparks per minute. Also the AC current and the AC voltage in the power to the precipitator are detected and the RMS values are obtained (32 and 34) and compared 35 and if the difference is above a predetermined value the power is disconnected (relay 36 and contacts 23 and 24).

REFERENCES:
patent: 3048744 (1962-08-01), Warrington
patent: 3622839 (1971-11-01), Abrams
patent: 4251846 (1981-02-01), Pearson et al.
patent: 4479164 (1984-10-01), Siegel
patent: 4486704 (1984-12-01), Gustafsson et al.

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