US5491971A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Closed circuit air cooled gas turbine combined cycle
Assignee: General Electric Co
•
Filing: 1993-12-23
•
Granted: 1996-02-20
•
Expires: 2013-12-23
Abstract
Abstract In a combined cycle system (10) which includes a gas turbine (12), a steam turbine (20); and at least one heat recovery steam generator (34) including evaporator(s) (38, 42, 46) operating at one or more pressures, and where condensate from the steam turbine (20) is evaporated by exhaust gas from the gas turbine (12) and returned to the steam turbine (20), the improvement comprising a closed loop cooling air circuit arranged such that hot cooling air from the gas turbine (12) is passed in heat exchange relationship with water from that one or more of the evaporators (46) in the heat recovery steam generator (34).
Inventors
- 👤 Leroy O. Tomlinson
- 👤 Raub W. Smith
- 👤 John E. Sholes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:11
CPC Classifications
F; F01; F01K; F01K23/00; F01K23/02; F01K23/06; F01K23/10; F01K23/106; Y; Y02; Y02E; Y02E20/00; Y02E20/16
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
95 words
In a combined cycle system which includes a gas turbine, a steam turbine, and at least one heat recovery steam generator where condensate from the steam turbine is evaporated by exhaust gas from the gas turbine and introduced into the steam turbine, the improvement comprising a closed loop cooling air circuit arranged to cool gas turbine parts wherein cooling air, after passing through the gas turbine, is passed in heat exchange relationship with water from an evaporator in the heat recovery steam generator so as to generate additional steam which is returned to said evaporator.
Claim 2
Dependent Claim
95 words
In a combined cycle system which includes a gas turbine, a steam turbine, and at least one heat recovery steam generator where condensate from the steam turbine is evaporated by exhaust gas from the gas turbine and introduced into the steam turbine, the improvement comprising a closed loop cooling air circuit arranged to cool gas turbine parts wherein cooling air, after passing through the gas turbine, is passed in heat exchange relationship with water from an evaporator in the heat recovery steam generator so as to generate additional steam which is returned to said evaporator.
Claim 3
Dependent Claim
21 words
The combined cycle system of claim 1 wherein air in said loop cooling air circuits is circulated by a circulating compressor.
Claim 4
Dependent Claim
38 words
The combined cycle system of claim 1 wherein said cooling air in said loop cooling air circuit is used, after passing through the gas turbine, to heat fuel prior to admission of the fuel into the gas turbine.
Claim 5
Dependent Claim
22 words
The combined cycle system of claim 3 wherein said fuel passes through a heat exchanger in said closed loop cooling air circuit.
Claim 6
Dependent Claim
21 words
The combined cycle system of claim 1 wherein said heat recovery steam generator includes one or more pressures for steam generation.
Claim 7
Dependent Claim
108 words
In a combined cycle system which includes a gas turbine, a steam turbine; and at least one heat recovery steam generator including at least one evaporator and where condensate from the steam turbine is evaporated by exhaust gas from the gas turbine and subsequently introduced into the steam turbine, the improvement comprising a closed loop cooling air circuit arranged to cool gas turbine parts wherein cooling air, after passing through the gas turbine is passed in heat exchange relationship with water from said at least one evaporator in the heat recovery steam generator, so as to generate additional steam which is returned to said at least one evaporator.
Claim 8
Dependent Claim
108 words
In a combined cycle system which includes a gas turbine, a steam turbine; and at least one heat recovery steam generator including at least one evaporator and where condensate from the steam turbine is evaporated by exhaust gas from the gas turbine and subsequently introduced into the steam turbine, the improvement comprising a closed loop cooling air circuit arranged to cool gas turbine parts wherein cooling air, after passing through the gas turbine is passed in heat exchange relationship with water from said at least one evaporator in the heat recovery steam generator, so as to generate additional steam which is returned to said at least one evaporator.
Claim 9
Dependent Claim
52 words
The combined cycle system of claim 6 wherein said cooling air circuit includes an air path which receives cooling air from a gas turbine cooling system discharge; and wherein said cooling air from said gas turbine cooling system discharge is used to heat fuel prior to its admission into the gas turbine.
Claim 10
Dependent Claim
103 words
In a combined cycle system which includes a gas turbine, a steam turbine, and at least one heat recovery steam generator where condensate from the steam turbine is evaporated by exhaust gas from the gas turbine and introduced into the steam turbine, the improvement comprising a closed loop cooling air circuit arranged to cool gas turbine parts wherein cooling air, after passing through the gas turbine, is passed in heat exchange relationship with water from an evaporator in the heat recovery steam generator; and wherein said cooling air circuit includes an air path which receives makeup air from a gas turbine compressor discharge.
Claim 11
Dependent Claim
103 words
In a combined cycle system which includes a gas turbine, a steam turbine, and at least one heat recovery steam generator where condensate from the steam turbine is evaporated by exhaust gas from the gas turbine and introduced into the steam turbine, the improvement comprising a closed loop cooling air circuit arranged to cool gas turbine parts wherein cooling air, after passing through the gas turbine, is passed in heat exchange relationship with water from an evaporator in the heat recovery steam generator; and wherein said cooling air circuit includes an air path which receives makeup air from a gas turbine compressor discharge.
Claim 12
Dependent Claim
28 words
The combined cycle system of claim 8 wherein said makeup air is introduced into said closed loop cooling air circuit by means of a makeup air booster compressor.
Claim 13
Dependent Claim
114 words
In a combined cycle system which includes a gas turbine, a steam turbine; and at least one heat recovery steam generator including at least one evaporator and where condensate from the steam turbine is evaporated by exhaust gas from the gas turbine and subsequently introduced into the steam turbine, the improvement comprising a closed loop cooling air circuit arranged to cool gas turbine parts wherein cooling air, after passing through the gas turbine is passed in heat exchange relationship with water from said at least one evaporator in the heat recovery steam generator; and wherein said cooling air circuit includes an air path which also receives makeup air from a gas turbine compressor discharge.
Claim 14
Dependent Claim
114 words
In a combined cycle system which includes a gas turbine, a steam turbine; and at least one heat recovery steam generator including at least one evaporator and where condensate from the steam turbine is evaporated by exhaust gas from the gas turbine and subsequently introduced into the steam turbine, the improvement comprising a closed loop cooling air circuit arranged to cool gas turbine parts wherein cooling air, after passing through the gas turbine is passed in heat exchange relationship with water from said at least one evaporator in the heat recovery steam generator; and wherein said cooling air circuit includes an air path which also receives makeup air from a gas turbine compressor discharge.
References Cited (Backward Citations)
US3150487A
Cited
US3691760A
Cited
US3879616A
Cited
US4288979A
Cited
US4424668A
Cited
US4891937A
Cited
US4576124A
Cited
US5199256A
Cited
US4991391A
Cited
US4932204A
Cited
US5174107A
Cited
US5255507A
Cited
US5285629A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-02-19 | 1999-08-21 | 2000-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-02-19 | 2003-08-21 | 2004-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-02-19 | 2007-08-21 | 2008-02-20 | $7700.00 | Window Closed / Lapsed |