Method and apparatus for detecting back corona in an electrostatic filter with ordinary or intermittent DC-voltage supply
US4936876A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 12, 1987 |
| Grant date | Jun 26, 1990 |
| Priority date | — |
| Expiry date | Nov 12, 2007 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB03C3/68
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
In an electrostatic precipitator for cleansing flue gases from industrial plants, comprising one or more precipitator sections powered from a 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 wtih 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 sparks-over so that the reducing effect of the spark-over on the degree of purification may be avoided at the next sparks-over.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.