B - Operations – Transporting – 03 – C
Patent
B - Operations, Transporting
03
C
317/2.1
B03C 3/68 (2006.01)
Patent
CA 1314924
Abstract In an electrostatic precipitator for cleansing flue gases from industrial plants, comprising one or more precipitator sections powered from separate continuous or intermittent DC-voltage electric supplies, a method and apparatus for detecting back corona, i.e. discharges in the dust layer precipitated on the collecting electrodes of an emission electrode system during the cleansing process, by making periodic upward adjustment of the precipitator current for each DC-voltage supply until spark-over occurs, and where after spark-over or a blocking of the precipitator current for a predetermined period of time if no spark-over occurs, the minimum value of the precipitator voltage is compared with the minimum value before the spark-over or before the blocking period, the latter minimum value being corrected by means of a predetermined sensitivity factor. In this way a measurement may be made for each single spark-over so that the reducing effect of the spark-over on the degree of purification may be avoided at the next spark-over.
551283
Borden Ladner Gervais Llp
F.l. Smidth & Co. A/s
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