Patent US3581468A successfully refreshed from Google Patents.
US3581468A
Expired / Lapsed
US
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Turbulence inducing electrogasdynamic precipitator
Assignee: Energy Innovations Inc
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Filing: 1969-04-09
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Granted: 1971-06-01
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Expires: 1989-04-09
Abstract
Abstract An electrostatic precipitator in which particles entrained in the gas stream are charged electrically by a corona discharge field established in opposition to the gas stream between a plurality of emitter electrodes and a screen attractor electrode upstream of an surrounding the emitter electrodes, inducing turbulence in the stream. The velocity at which the particles pass through the charging field is increased by a dielectric converging-diverging nozzle located across the gas stream closely adjacent the particle charging field to retard migration of the charged particles to the screen attractor. The charged particles are collected downstream of the discharge field on an electrically charged moving dielectric member by which an electric precipitation field terminating at a passive reference electrode is maintained across the gas steam. Charges and charged particles are held on the collection surface of the dielectric member by an electric field created between that surface and a conductive member adjacent the opposite surface of the dielectric member. At a location isolated from the gas stream, the collected particles are removed from the collecting surface.
Inventors
- 👤 Meredith C Gourdine
- 👤 Geza Von Voros
- 👤 Ta Kuan Chiang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:24
CPC Classifications
B; B03; B03C; B03C3/00; B03C3/02; B03C3/04; B03C3/10
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
44 words
Apparatus according to claim 1 further comprising means for establishing an electric field exteriorly of the gas stream and having a value exceeding the value of the electric precipitation field and reacting with the particles collected on the moving surface to retain them thereon.
Claim 2
Dependent Claim
69 words
Apparatus according to claim 2 in which the moving surface is constructed of dielectric material and in which the means for establishing an electric field exteriorly of the gas stream includes means for imparting to the moving dielectric surface an electric charge of opposite polarity to that imparted to the entrained particles and an electrically conductive member located closely adjacent the dielectric surface and exterior to the gas stream.
Claim 3
Dependent Claim
35 words
Apparatus according to claim 3 in which the moving dielectric surface comprises at least one endless belt having one side constructed of a dielectric material and the othEr side constructed of an electrically conductive material.
Claim 4
Dependent Claim
29 words
Apparatus according to claim 4 in which both sides of the endless belt are constructed of dielectric material and an intermediate layer of electrically conductive material is disposed therebetween.
Claim 5
Dependent Claim
44 words
Apparatus according to claim 1 in which the corona discharge means includes a screen disposed to accept the gas flow, the screen being porous to the entrained particles and defining an attractor electrode, and at least one emitter electrode downstream of the attractor electrode.
Claim 6
Dependent Claim
26 words
Apparatus in accordance with claim 6 in which the corona discharge means further comprises means for retarding the migration of charged particles to the attractor electrode.
Claim 7
Dependent Claim
36 words
Apparatus according to claim 7 in which the means for retarding particle migration comprises a converging-diverging nozzle constructed of dielectric material and located in the gas stream to accept the flow passing through the attractor electrode.
Claim 8
Dependent Claim
24 words
Apparatus according to claim 8 in which the dielectric nozzle is located at least partly intermediate the corona discharge field and the moving surface.
Claim 9
Dependent Claim
44 words
Apparatus according to claim 6 in which the porous screen is elongated in the general direction of flow of the gas stream and in which a plurality of emitter electrodes are spaced therealong to establish a plurality of corona discharges in the gas stream.
Claim 10
Dependent Claim
43 words
Apparatus in accordance with claim 10 in which the porous screen is generally U-shaped, with the open end facing downstream, and the plurality of emitter electrodes are spaced within the U-shaped attractor electrode along the general direction of flow of the gas stream.
Claim 11
Dependent Claim
36 words
Apparatus in accordance with claim 10 further comprising a converging-diverging nozzle constructed of dielectric material and located in the gas stream at least partly intermediate the downstream end of the porous screen and the moving surface.
Claim 12
Dependent Claim
37 words
Apparatus according to claim 11 further comprising a converging-diverging nozzle defining a throat and located in the gas stream and constructed of dielectric material, the open downstream end of the screen adjoining the throat of the nozzle.
Claim 13
Dependent Claim
104 words
Apparatus for imparting an electrical charge to particles entrained in a gas stream and for introducing turbulence into the gas stream comprising a screen porous to the entrained particles located across the path of flow of the particles and defining an attractor electrode, the screen being elongated in the general direction of flow of the particles, and a plurality of emitter electrodes located downstream of a portion of the screen and spaced along the elongated length of the screen, the emitter and attractor electrodes being adapted for connection to a power supply for establishing corona discharges from the emitter electrodes to the porous screen.
Claim 14
Dependent Claim
20 words
Apparatus according to claim 14 further comprising means for retarding migration of the charged particles to the porous attractor electrode.
Claim 15
Dependent Claim
34 words
Apparatus in accordance with claim 15 in which the migration retarding means includes a converging-diverging nozzle constructed of dielectric material and located across the gas stream adjacent to the downstream end of the screen.
Claim 16
Dependent Claim
43 words
Apparatus in accordance with claim 14 in which the porous screen is generally U-shaped, with the open end facing downstream, and the plurality of emitter electrodes are spaced within the U-shaped attractor electrode along the general direction of flow of the gas stream.
Claim 17
Dependent Claim
38 words
Apparatus according to claim 17 further comprising a converging-diverging nozzle defining a throat and located in the gas stream and constructed of dielectric material, the downstream end of the U-shaped screen adjoining the nozzle near the throat thereof.
Claim 18
Dependent Claim
149 words
Apparatus for electrostatically precipitating particles entrained in a gas stream, comprising means for imparting an electrical charge to the entrained particles; means defining at least one member downstream of the particle charging means adjacent to And movable along the gas stream boundary, the surface of the member facing the gas stream being dielectric; means for imparting to the dielectric surface an electrical charge of opposite polarity to that of the charge imparted to the particles to create an attractive force therebetween; means for subjecting the charges on the dielectric surface to an electrostatic force normal to the surface and reacting with the charges to retain them thereon that is greater than any corresponding electrostatic force in an opposite direction created by electrical fields within the gas stream; and means for inducing turbulence in the gas stream to create gas currents tending to carry entrained particles to the dielectric surface.
Claim 19
Dependent Claim
48 words
Apparatus according to claim 19 in which the particle-charging means comprises an attractor electrode and a corona electrode, and in which the turbulence inducing means includes means for locating the corona electrode downstream of the attractor electrode to create a corona discharge in opposition to the gas stream.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-05-31 | 1974-11-30 | 1975-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-31 | 1978-11-30 | 1979-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-31 | 1982-11-30 | 1983-06-01 | $7700.00 | Window Closed / Lapsed |