Method of and apparatus for reducing back corona effects

Details Method of and apparatus for reducing back corona effects Method of and apparatus for reducing back corona effects

1979-07-13

1980-11-11

Lacey, David L.

Gas separation

Means within gas stream for conducting concentrate to collector

55137, B03C 308, B03C 340

Patent

active

042330378

ABSTRACT:
An apparatus and method for reducing back corona effects while charging high resistivity dust or the like in a corona field, includes a corona discharge electrode, a passive electrode and a screen electrode, the screen electrode being positioned between the discharge electrode and the passive electrode. The screen electrode is positioned more closely to the passive electrode than the discharge electrode and is supplied with an electrical potential which is of the same polarity as and a fraction of the magnitude of the discharge electrode relative to the passive electrode. Gas having entrained therein the particulate material, which is to be removed, flows between the screen and discharge electrode and thence to a particulate material collection stage. The space between the screen and corona discharge electrode remains essentially a unipolar ion field, while ions of the opposite polarity originating at passive electrode due to back corona are collected by the screen electrode.

REFERENCES:
patent: 1943070 (1934-01-01), Grave
patent: 2142129 (1939-01-01), Hoss et al.
patent: 2192250 (1940-03-01), White
patent: 2377391 (1945-06-01), White
patent: 2873000 (1959-02-01), Elam

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