Patent US5412937A successfully refreshed from Google Patents.
US5412937A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Steam cycle for combined cycle with steam cooled gas turbine
Assignee: General Electric Co
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Filing: 1993-11-04
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Granted: 1995-05-09
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Expires: 2013-11-04
Abstract
Abstract In a combined cycle system including a gas turbine (12), a steam turbine (20) and a heat recovery steam generator (32), wherein gas turbine exhaust is used in the heat recovery steam generator (32) for reheating steam for the steam turbine (20), an improvement wherein steam is extracted from the heat recovery steam generator (32) at a location where steam pressure is highest, conducted to the gas turbine (12) for cooling hot gas turbine parts, and returned to the steam turbine (20) at the point of highest pressure admission.
Inventors
- 👤 Leroy O. Tomlinson
- 👤 Raub W. Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:29
CPC Classifications
F; F02; F02C; F02C6/00; F02C6/18; F01; F01K; F01K23/00; F01K23/02; F01K23/06; F01K23/10; F01K23/106; F02C7/00; F02C7/12; F02C7/16; F02C7/18; F05; F05D; F05D2260/00; F05D2260/20; F05D2260/232; F05D2260/2322; Y; Y02; Y02E; Y02E20/00; Y02E20/14; Y02E20/16
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
101 words
In a combined cycle system including a gas turbine, a steam turbine and a heat recovery steam generator including means for generating steam and a high pressure superheater, wherein gas turbine exhaust is used in the heat recovery steam generator for reheating steam for the steam turbine, the improvement comprising means for extracting steam from the high pressure superheater of the heat recovery steam generator where steam pressure is highest and conducting the extracted steam to the gas turbine for cooling hot gas turbine parts, and means for delivering the extracted steam to a high pressure section of the steam turbine.
Claim 2
Dependent Claim
101 words
In a combined cycle system including a gas turbine, a steam turbine and a heat recovery steam generator including means for generating steam and a high pressure superheater, wherein gas turbine exhaust is used in the heat recovery steam generator for reheating steam for the steam turbine, the improvement comprising means for extracting steam from the high pressure superheater of the heat recovery steam generator where steam pressure is highest and conducting the extracted steam to the gas turbine for cooling hot gas turbine parts, and means for delivering the extracted steam to a high pressure section of the steam turbine.
Claim 3
Dependent Claim
34 words
The improvement of claim 1 and further including means for returning the extracted steam to the high pressure superheater of the heat recovery steam generator before conducting the extracted steam to the steam turbine.
Claim 4
Dependent Claim
39 words
The improvement of claim 1 wherein said delivering means returns the extracted steam to the heat recovery steam generator at a location where the extracted steam combines with non-extracted steam for further heating in the heat recovery steam generator.
Claim 5
Dependent Claim
24 words
The improvement of claim 1 wherein only a portion of the steam in the heat recovery steam generator is extracted by said extracting means.
Claim 6
Dependent Claim
98 words
In a combined cycle system including a gas turbine, a steam turbine, and a heat recovery steam generator wherein gas turbine exhaust is used in the heat recovery steam generator for reheating steam for the steam turbine, the improved method of cooling the gas turbine comprising the steps of: a) extracting at least some steam from a high pressure superheater in the heat recovery steam generator and delivering the extracted steam to hot parts of the gas turbine to cool said hot parts; and b) delivering the extracted steam to a high pressure section of the steam turbine.
Claim 7
Dependent Claim
98 words
In a combined cycle system including a gas turbine, a steam turbine, and a heat recovery steam generator wherein gas turbine exhaust is used in the heat recovery steam generator for reheating steam for the steam turbine, the improved method of cooling the gas turbine comprising the steps of: a) extracting at least some steam from a high pressure superheater in the heat recovery steam generator and delivering the extracted steam to hot parts of the gas turbine to cool said hot parts; and b) delivering the extracted steam to a high pressure section of the steam turbine.
Claim 8
Dependent Claim
42 words
The method of claim 5 wherein step b) is practiced by returning the extracted steam to said high pressure superheater in the heat recovery steam generator for reheating, and then returning the steam to said high pressure section of said steam turbine.
Claim 9
Dependent Claim
22 words
The method of claim 5 wherein step a) is practiced by extracting substantially all of the steam from the high pressure superheater.
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) | 1998-05-08 | 1998-11-07 | 1999-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-05-08 | 2002-11-07 | 2003-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-05-08 | 2006-11-07 | 2007-05-09 | $7700.00 | Window Closed / Lapsed |