Method and apparatus for controlling power to an electronic prec

Details Method and apparatus for controlling power to an electronic prec Method and apparatus for controlling power to an electronic prec

1984-06-28

1986-08-12

Beha, Jr., William H.

Gas separation

Means within gas stream for conducting concentrate to collector

55105, 363 81, 364480, B03C 368

Patent

active

046054243

ABSTRACT:
A method and apparatus for controlling power to a precipitator 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. Means are 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: 3622839 (1971-11-01), Abrahms et al.
patent: 3648437 (1972-03-01), Bridges
patent: 3745749 (1973-07-01), Gelfand
patent: 3893828 (1975-07-01), Archer
patent: 4267502 (1981-05-01), Reese et al.
patent: 4326860 (1982-04-01), Laugesen
patent: 4335414 (1982-06-01), Weber
patent: 4354152 (1982-10-01), Herklotz et al.
patent: 4390831 (1983-06-01), Byrd et al.
patent: 4432061 (1984-02-01), Herklotz et al.

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