US4729217A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Combined gas/steam power station plant
Assignee: BBC Brown Boveri AG Switzerland
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Filing: 1987-05-15
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Granted: 1988-03-08
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Expires: 2007-05-15
Abstract
Abstract In a combined gas/steam turbine power station plant with integrated coal gasification, the gas turbine combustion chamber and auxiliary firing in the exhaust heat steam generator are fired with fuel gas from the gas generator with nitrogen from the air separation plant being previously mixed with the fuel gas.
Inventors
- 👤 Rolf Kehlhofer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:58
CPC Classifications
F; F01; F01K; F01K23/00; F01K23/02; F01K23/06; F01K23/067; F01K23/068; F02; F02C; F02C3/00; F02C3/20; F02C3/26; F02C3/28; F25; F25J; F25J3/00; F25J3/02; F25J3/04; F25J3/04006; F25J3/04012; F25J3/04018; F25J3/04109; F25J3/04115; F25J3/04121; F25J3/04521; F25J3/04527; F25J3/04539; F25J3/04545; F25J3/04563; F25J3/04575; F25J3/04581; F25J3/04593; F25J3/04612; Y; Y02; Y02E; Y02E20/00; Y02E20/16; Y02E20/18; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
240 words
A method of operating a combined gas/steam turbine power station plant having a gas turbine, a combustion chamber, a gas generator and an exhaust heat steam generator downstream of the gas turbine, the steam generator provided with a working medium and an auxiliary firing operation for increasing steam turbine power, the auxiliary firing operation and gas turbine combustion chamber operated on a fuel supplied from the gas comprising the steps of: (a) generating an oxygen supply from an air separation plant, supplying said oxygen to the gas generator, obtaining fuel gas from the gas generator while operating the gas generator by coal gasification, dividing the fuel gas into a first portion and a second portion, and directing the first portion of the fuel gas to said gas turbine combustion chamber and directing the second portion of the fuel gas to the exhaust heat steam generator; (b) generating a nitrogen supply in the air separation plant, conducting said nitrogen supply away from the air separation plant and dividing said nitrogen supply into a first portion and a second portion; (c) mixing the first portion of the fuel gas and the first portion of the nitrogen in a predetermined ratio and supplying the mixture to the gas turbine combustion chamber; and (d) mixing the second portion of the fuel gas and the second portion of the nitrogen together in a predetermined ratio and supplying the mixture to the exhaust heat steam generator.
Claim 2
Independent Claim
240 words
A method of operating a combined gas/steam turbine power station plant having a gas turbine, a combustion chamber, a gas generator and an exhaust heat steam generator downstream of the gas turbine, the steam generator provided with a working medium and an auxiliary firing operation for increasing steam turbine power, the auxiliary firing operation and gas turbine combustion chamber operated on a fuel supplied from the gas comprising the steps of: (a) generating an oxygen supply from an air separation plant, supplying said oxygen to the gas generator, obtaining fuel gas from the gas generator while operating the gas generator by coal gasification, dividing the fuel gas into a first portion and a second portion, and directing the first portion of the fuel gas to said gas turbine combustion chamber and directing the second portion of the fuel gas to the exhaust heat steam generator; (b) generating a nitrogen supply in the air separation plant, conducting said nitrogen supply away from the air separation plant and dividing said nitrogen supply into a first portion and a second portion; (c) mixing the first portion of the fuel gas and the first portion of the nitrogen in a predetermined ratio and supplying the mixture to the gas turbine combustion chamber; and (d) mixing the second portion of the fuel gas and the second portion of the nitrogen together in a predetermined ratio and supplying the mixture to the exhaust heat steam generator.
Claim 3
Dependent Claim
35 words
The method of claim 1, including delivering the mixture of the fuel gas and the second portion of the nitrogen to an expansion turbine prior to supplying the mixture to the exhaust heat steam generator.
Claim 4
Dependent Claim
22 words
The method of claim 2, including driving a compressor with the expansion turbine and supplying the air separation plant with compressed air.
Claim 5
Dependent Claim
35 words
The method of claim 1, including delivering the mixture of the fuel gas and the second portion of the nitrogen to an expansion turbine prior to supplying the mixture to the gas turbine combustion chamber.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-03-08 | 1991-09-07 | 1992-03-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-03-08 | 1995-09-07 | 1996-03-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-03-08 | 1999-09-07 | 2000-03-08 | $7700.00 | Window Closed / Lapsed |