US4871515A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrostatic filter
Assignee: MT Aerospace AG
•
Filing: 1988-06-22
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Granted: 1989-10-03
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Expires: 2008-06-22
Abstract
Abstract The invention provides an electrostatic particle filter in the case of which the collecting electrode is structured in order to make possible a reliable separation of the particles from the gases. The collecting electrode is so designed that a number of windshadow areas formed by spaces are provided in which the electrostatically attracted particles are able to be trapped without being entrained by the main current. A powerful corona discharge ensures simultaneous oxidation of combustible particles if the gas current contains oxygen.
Inventors
- 👤 Ernst-Michael Reichle
- 👤 Matthias Seel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:37
CPC Classifications
F; F01; F01N; F01N3/00; F01N3/01; B; B01; B01J; B01J19/00; B01J19/08; B01J19/087; B01J19/088; B03; B03C; B03C3/00; B03C3/017; B03C3/34; B03C3/40; B03C3/45; B03C3/455; B03C3/51; B01J2219/00; B01J2219/08; B01J2219/0803; B01J2219/0805; B01J2219/0845; B01J2219/0849; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
169 words
An electrostatic filter for separating combustible particles from a gas containing oxygen comprising a housing having inlet means for a gas containing oxygen and combustible particles and outlet means for discharge of the gas from which the combustible particles have been separated and burned, two electrodes arranged in said housing for producing an electrostatic field through which a flow of said gas is passed, one of said electrodes being in the form of a collecting electrode constructed with trapping openings and positioned so that combustible particles in the gas are attracted thereto, means for applying a voltage of high potential to the other of said electrodes to produce a corona discharge of sufficient intensity to ionize the oxygen in the gas and produce oxygen or ozone ions which oxidize said combustible particles, and heating means associated with the collecting electrode for providing heat for burning the oxidized combustible particles within the housing, the gas from which the combustible particles have been separated and combusted flowing to said outlet means.
Claim 2
Dependent Claim
169 words
An electrostatic filter for separating combustible particles from a gas containing oxygen comprising a housing having inlet means for a gas containing oxygen and combustible particles and outlet means for discharge of the gas from which the combustible particles have been separated and burned, two electrodes arranged in said housing for producing an electrostatic field through which a flow of said gas is passed, one of said electrodes being in the form of a collecting electrode constructed with trapping openings and positioned so that combustible particles in the gas are attracted thereto, means for applying a voltage of high potential to the other of said electrodes to produce a corona discharge of sufficient intensity to ionize the oxygen in the gas and produce oxygen or ozone ions which oxidize said combustible particles, and heating means associated with the collecting electrode for providing heat for burning the oxidized combustible particles within the housing, the gas from which the combustible particles have been separated and combusted flowing to said outlet means.
Claim 3
Dependent Claim
20 words
The filter as claimed in claim 1 wherein the collecting electrode forms an exhaust gas duct means within the housing.
Claim 4
Dependent Claim
14 words
The filter as claimed in claim 1 wherein the collecting electrode comprises metal wool.
Claim 5
Dependent Claim
19 words
The filter as claimed in claim 1 wherein the collecting electrode comprises a stack of perforated sheet metal elements.
Claim 6
Dependent Claim
17 words
The filter as claimed in claim 1 wherein the collecting electrode consists of an electrically conducting material.
Claim 7
Dependent Claim
17 words
The filter as claimed in claim 1 wherein said heating means comprises an electrical resistance heating element.
Claim 8
Dependent Claim
29 words
The filter as claimed in claim 1 wherein the collecting electrode is in the form of a sheet structure and wire netting on the electrode facing the gas flow.
Claim 9
Dependent Claim
20 words
The filter as claimed in claim 1, said heating means comprising an electrical heating element extending through the collecting electrode.
Claim 10
Dependent Claim
19 words
The filter as claimed in claim 1 wherein the collecting electrode is at least partly coated with a catalyst.
Claim 11
Dependent Claim
24 words
The filter as claimed in claim 1 wherein the other electrode consists of at least one wire with a diameter less than 0.15 mm.
Claim 12
Dependent Claim
18 words
The filter as claimed in claim 1 wherein the collecting electrode is in the form of a tube.
Claim 13
Dependent Claim
22 words
The filter as claimed in claim 1 wherein the collecting electrode comprises comprises filter wool, fabric, or a stack of perforated plates.
Claim 14
Dependent Claim
18 words
The filter as claimed in claim 1 comprising thermal insulation means between said collecting electrode and said housing.
Claim 15
Dependent Claim
27 words
The filter as claimed in claim 1 comprising means for regulating the operation of the heating means, in accordance with deposition of particles on said collecting electrode.
Claim 16
Dependent Claim
18 words
The filter as claimed in claim 1 wherein the collecting electrode consists of at least one metallic spiral.
Claim 17
Dependent Claim
22 words
The filter as claimed in claim 15 wherein the metallic spiral is arranged in grooves in a refractory electrically insulating holding means.
Claim 18
Dependent Claim
34 words
The filter as claimed in claim 1 comprising a tube arranged on the housing to conduct the part of the gas current passing through the collecting electrode back into the cleaned main gas current.
Claim 19
Dependent Claim
24 words
The filter as claimed in claim 17 wherein the tube opens into a narrow part of a main gas tube downstream from the housing.
Claim 20
Dependent Claim
17 words
The filter as claimed in claim 1 wherein said collecting electrode comprises a plurality of filter plates.
Claim 21
Dependent Claim
21 words
The filter as claimed in claim 19 wherein filler plates have said openings arranged with an offset from plate to plate.
References Cited (Backward Citations)
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JPS54156277A
Cited
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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) | 1992-10-02 | 1993-04-03 | 1993-10-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-10-02 | 1997-04-03 | 1997-10-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-10-02 | 2001-04-03 | 2001-10-03 | $7700.00 | Window Closed / Lapsed |