Two-stage electrostatic filter

Details Two-stage electrostatic filter Two-stage electrostatic filter

1997-06-06

1999-11-30

Chiesa, Richard L.

Gas separation: apparatus

Electric field separation apparatus

Including gas flow distribution means

96 79, 96 85, 96 98, B03C 308

Patent

active

059935219

ABSTRACT:
A two-stage electrostatic filter includes an ionization section which is arranged in an upstream part of a throughflow passage (28) and includes a wire-like corona electrode (31) which is disposed in an ionization chamber (29) and connected to one pole of an electric high voltage source (16). The filter further includes a target electrode (21;37) which is spaced from the corona electrode (31) and connected to another pole of the high voltage source. A capacitator separator (30) is located in a downstream part of the throughflow passage (28) and includes a first and second group of electrode elements (32,33) which are placed side-by-side in spaced-apart relationship. The electrode elements (32) of the first group are placed alternately with the electrode elements (33) of the second group and are adapted to lie on a potential which is different from the potential on which the electrode elements (33) of the second group lie. The ionization chamber (29) has a target electrode surface (37;21) which is disposed both upstream and downstream of the corona electrode (31). When measured perpendicularly to the upstream-downstream direction of the throughflow passage (28) and to the longitudinal axis of the corona electrode, the distance of the corona electrode (31) from the target electrode surface is at least four times the distance between neighboring electrode elements (32,33). The capacitator separator (30) and the ionization chamber (29) form a disposable unit made of a non-metallic material, preferably a cellulose fibre material.

REFERENCES:
patent: 2181767 (1939-11-01), Penney
patent: 2875845 (1959-03-01), Penney
patent: 4072477 (1978-02-01), Hanson et al.
patent: 4861356 (1989-08-01), Penney
Mitsubishi Electric Corporation, drawings and specifications, Mar. 18, 1983.
"Electrostatiska Filter;" Industrifilter, Industriel Miljo, May 17, 1994.
"Air Filtration System--RC Type," Panasonic, Mar. 29, 1995.

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