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US4899537A
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Steam-injected free-turbine-type gas turbine
Assignee: Cheng Power Systems Inc
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Filing: 1984-02-07
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Granted: 1990-02-13
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Expires: 2004-02-07
Abstract
Abstract A steam-injected free-turbine type of gas turbine is disclosed. In order to avoid the necessity of redesigning the compressor/core turbine, the shaft of the core turbine is modified to provide additional load output. As steam is injected into the system the resulting excess power of the core turbine is taken out of the system by coupling the compressor output shaft with a load. Thus, the core turbine operates as a single shaft turbine in addition to the existing power turbine. A control provides control of the load output of the two turbine output shafts so that the compressor/turbine stays in the matched operating domain.
Inventors
- 👤 Dah Yu Cheng
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:42
CPC Classifications
F; F02; F02C; F02C3/00; F02C3/04; F02C3/10; F01; F01K; F01K21/00; F01K21/04; F01K21/047; F02C9/00; F02C9/48
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
103 words
In a free turbine type gas turbine comprising: compressor means; a core turbine mechanically coupled with said compressor means to power it; a power turbine which is independent from said core turbine; and a combustion chamber for providing a heated working fluid; means for adding steam to said working fluid; means for providing a single flow path for said working fluid, first through said core turbine and then through said power turbine; and wherein the improvement comprises: means for preventing mismatch between the core turbine and the compressor due to the addition of steam comprising coupling a variable output load to the compressor.
Claim 2
Dependent Claim
103 words
In a free turbine type gas turbine comprising: compressor means; a core turbine mechanically coupled with said compressor means to power it; a power turbine which is independent from said core turbine; and a combustion chamber for providing a heated working fluid; means for adding steam to said working fluid; means for providing a single flow path for said working fluid, first through said core turbine and then through said power turbine; and wherein the improvement comprises: means for preventing mismatch between the core turbine and the compressor due to the addition of steam comprising coupling a variable output load to the compressor.
Claim 3
Dependent Claim
20 words
A gas turbine as in claim 1 wherein said steam adding means includes a waste heat boiler for generating steam.
Claim 4
Dependent Claim
16 words
A gas turbine as in claim 2 wherein said waste heat boiler additionally provides process steam.
Claim 5
Dependent Claim
28 words
A gas turbine as in claim 1 including means for utilizing the exhausted working fluid gases from said power turbine for steam generation by said steam adding means.
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) | 1993-02-12 | 1993-08-14 | 1994-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-02-12 | 1997-08-14 | 1998-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-02-12 | 2001-08-14 | 2002-02-13 | $7700.00 | Window Closed / Lapsed |