Patent US5839267A successfully refreshed from Google Patents.
US5839267A
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US
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Cycle for steam cooled gas turbines
Assignee: General Electric Co
•
Filing: 1995-03-31
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Granted: 1998-11-24
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Expires: 2015-03-31
Abstract
Abstract This invention relates to a new land based gas turbine in simple or combined cycle configuration, which permits a user to incorporate air or steam cooling of hot gas turbine parts with minimal change in components, and which also incorporates design changes enabling certain turbine components to be used without change in both 50 and 60 Hz turbines. The invention here specifically relates to parameter selection for the operating cycles of 50 and 60 Hz gas turbines with air or steam cooling, and in simple or combined cycle configuration. A method of operating a combined cycle, gas turbine broadly comprises the steps of compressing inlet air with a multi-stage compressor with a pressure ratio of about 23 to 1; directing substantially all of the air discharged from the compressor to a combustion system to produce gaseous products of combustion; directing the gaseous products of combustion through the turbine; and exhausting the gaseous products of combustion.
Inventors
- 👤 Roger W. Schonewald
- 👤 Jairaj Ramachandran
- 👤 George W. Scheper, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 15:33
CPC Classifications
F; F01; F01K; F01K23/00; F01K23/02; F01K23/06; F01K23/10; F02; F02C; F02C7/00; F02C7/12; F02C7/16; F05; F05D; F05D2260/00; F05D2260/20; F05D2260/232; F05D2260/2322; Y; Y02; Y02E; Y02E20/00; Y02E20/16
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
102 words
A method operating a four stage gas turbine in a combined cycle system comprising the steps of: compressing inlet air with a multi-stage compressor with a pressure ratio of substantially 23 to 1; directing substantially all of the air discharged from the compressor to a combustion system of the four stage gas turbine to produced gaseous products of combustion; directing the gaseous products of combustion through a turbine section of the four stage gas turbine; exhausting the gaseous products of combustion; and wherein at least stages 1 and 2 are steam cooled, stage 3 is air cooled and stage 4 is uncooled.
Claim 2
Independent Claim
102 words
A method operating a four stage gas turbine in a combined cycle system comprising the steps of: compressing inlet air with a multi-stage compressor with a pressure ratio of substantially 23 to 1; directing substantially all of the air discharged from the compressor to a combustion system of the four stage gas turbine to produced gaseous products of combustion; directing the gaseous products of combustion through a turbine section of the four stage gas turbine; exhausting the gaseous products of combustion; and wherein at least stages 1 and 2 are steam cooled, stage 3 is air cooled and stage 4 is uncooled.
Claim 3
Dependent Claim
14 words
The method of claim 1 wherein airflow through the compressor is about 1200-1600 pps.
Claim 4
Dependent Claim
17 words
The method of claim 1 wherein turbine firing temperature is between about 2590 and about 2622° F.
Claim 5
Dependent Claim
22 words
The method of claim 1 wherein the gaseous products of combustion discharged from the combustion system enters stage 1 at 2650-2800° F.
Claim 6
Dependent Claim
20 words
The method of claim 1 wherein the gaseous products of combustion are exhausted from the turbine at about 1040-1140° F.
Claim 7
Dependent Claim
19 words
The method of claim 1 wherein the gaseous products of combustion have an exhaust Mach number of about 0.65.
Claim 8
Dependent Claim
24 words
The method of claim 6 wherein a portion of total air flow through the turbine used for cooling is between 5 and 6 percent.
Claim 9
Dependent Claim
14 words
The method of claim 1 wherein the gas turbine is operated at 50 Hz.
Claim 10
Dependent Claim
14 words
The method of claim 1 wherein the gas turbine is operated at 60 Hz.
Claim 11
Independent Claim
226 words
A method of operating a steam cooled gas turbine in combined cycle configuration where gas turbine exhaust is utilized to reheat condensate from a steam turbine in a heat recovery steam generator, and wherein steam is extracted from the steam turbine for cooling duty in the gas turbine, the method comprising the steps of: compressing inlet air with a multi-stage compressor; directing substantially all of the air discharged from the compressor to a combustion system to produce gaseous products of combustion; directing the gaseous products of combustion through a turbine; and exhausting the gaseous products of combustion; wherein the turbine is a four stage turbine with the first and second stages being steam cooled, the third stage air cooled and the fourth stage uncooled; and further wherein the turbine is operated in accordance with the following cycle parameters and performance characteristics, depending on whether the turbine is operated at 50 or 60 Hz: ______________________________________
60 Hz (steam)
50 Hz (steam)
______________________________________
"Rated" Output (MW)
400 480
"Rated" Efficiency (%)
60 60
RPM 3600 3000
Pressure Ratio 23.2 23.2
Compressor Air Flow
1230.3 1514
(pps)
Turbine (Nozzle) Inlet
Temp. (deg. F.) 2700 2700
Turbine Firing Temp.
2622 2622
(deg. F.)
Rotor Inlet Temp. (deg F.)
2600 2600
Turbine Exhaust Temp.
(deg. F.) 1121 1140
Exhaust Mach Number
0.65 0.68
Turbine Chargeable Flow
5.5 5.75.
(% Wc)
______________________________________
Claim 12
Independent Claim
226 words
A method of operating a steam cooled gas turbine in combined cycle configuration where gas turbine exhaust is utilized to reheat condensate from a steam turbine in a heat recovery steam generator, and wherein steam is extracted from the steam turbine for cooling duty in the gas turbine, the method comprising the steps of: compressing inlet air with a multi-stage compressor; directing substantially all of the air discharged from the compressor to a combustion system to produce gaseous products of combustion; directing the gaseous products of combustion through a turbine; and exhausting the gaseous products of combustion; wherein the turbine is a four stage turbine with the first and second stages being steam cooled, the third stage air cooled and the fourth stage uncooled; and further wherein the turbine is operated in accordance with the following cycle parameters and performance characteristics, depending on whether the turbine is operated at 50 or 60 Hz: ______________________________________
60 Hz (steam)
50 Hz (steam)
______________________________________
"Rated" Output (MW)
400 480
"Rated" Efficiency (%)
60 60
RPM 3600 3000
Pressure Ratio 23.2 23.2
Compressor Air Flow
1230.3 1514
(pps)
Turbine (Nozzle) Inlet
Temp. (deg. F.) 2700 2700
Turbine Firing Temp.
2622 2622
(deg. F.)
Rotor Inlet Temp. (deg F.)
2600 2600
Turbine Exhaust Temp.
(deg. F.) 1121 1140
Exhaust Mach Number
0.65 0.68
Turbine Chargeable Flow
5.5 5.75.
(% Wc)
______________________________________
Claim 13
Dependent Claim
31 words
A 50 Hz or 60 Hz steam cooled, or a 60 Hz air cooled, gas turbine which operates substantially in accordance with the respective operating parameters set forth in TABLE II.
Claim 14
Dependent Claim
31 words
A 50 Hz or 60 Hz steam cooled, or a 60 Hz air cooled, gas turbine which operates substantially in accordance with the respective operating parameters set forth in TABLE II.
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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) | 2001-11-23 | 2002-05-25 | 2002-11-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-11-23 | 2006-05-25 | 2006-11-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-11-23 | 2010-05-25 | 2010-11-24 | $7700.00 | Window Closed / Lapsed |