US4571935A
Expired / Lapsed
US
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Process for steam cooling a power turbine
Assignee: General Electric Switzerland GmbH
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Filing: 1985-01-16
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Granted: 1986-02-25
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Expires: 2005-01-16
Abstract
Abstract A reheat gas and double reheat steam turbine combined cycle is provided in which the outer shell confining the blading of the power turbine and the exhaust portion of the power turbine are cooled with steam extracted from the steam cycle. The coolant steam is extracted from a high pressure steam turbine, used to cool the turbine outer shell, readmitted for expansion in the steam turbine, the lower pressure steam is extracted to cool the exhaust portion of the power turbine and readmitted to the steam turbine and condensed.
Inventors
- 👤 Ivan G. Rice
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:18
CPC Classifications
F; F01; F01K; F01K23/00; F01K23/02; F01K23/06; F01K23/10; F01K23/103; F01D; F01D5/00; F01D5/12; F01D5/14; F01D5/18; F01D5/185; F01D5/187; F02; F02C; F02C6/00; F02C6/003; F02C6/18; F02C7/00; F02C7/12; F02C7/16; F05; F05D; F05D2240/00; F05D2240/20; F05D2240/30; F05D2240/302; F05D2250/00; F05D2250/20; F05D2250/25; F05D2260/00; F05D2260/20; F05D2260/202; F05D2260/232; F05D2260/2322; Y; Y02; Y02E; Y02E20/00; Y02E20/16; Y02T; Y02T50/00; Y02T50/60
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
146 words
A method of producing work by means of a turbomachine comprising a gas compressor and a gas turbine, said gas turbine comprising an outer casing confining the blading thereof, said method comprising; compressing ambient air in said gas compressor, igniting said compressed air in a combustor to form a heated gas, expanding said heated gas through the blading of said gas turbine, heating said outer casing before start up of said turbomachine to thermally expand said outer casing and increase the tip clearance between said blading and said casing, cooling said outer casing during expansion of said heated gas through the blading of said turbine to control the tip clearance between said casing and said blading and heating said outer casing and thermally expanding said outer casing after trip out of said gas turbine to prevent the blade tips from rubbing said casing during coast down.
Claim 2
Independent Claim
146 words
A method of producing work by means of a turbomachine comprising a gas compressor and a gas turbine, said gas turbine comprising an outer casing confining the blading thereof, said method comprising; compressing ambient air in said gas compressor, igniting said compressed air in a combustor to form a heated gas, expanding said heated gas through the blading of said gas turbine, heating said outer casing before start up of said turbomachine to thermally expand said outer casing and increase the tip clearance between said blading and said casing, cooling said outer casing during expansion of said heated gas through the blading of said turbine to control the tip clearance between said casing and said blading and heating said outer casing and thermally expanding said outer casing after trip out of said gas turbine to prevent the blade tips from rubbing said casing during coast down.
Claim 3
Dependent Claim
17 words
The method of claim 1 wherein said outer casing is provided with an outer layer of insulation.
Claim 4
Dependent Claim
31 words
The method of claim 1 wherein said outer casing is cooled during expansion of said heated gas through said blading by passing steam in heat exchange relationship with said outer casing.
Claim 5
Dependent Claim
28 words
The method of claim 1 wherein said outer casing is heated prior to startup of said turbomachine by passing steam in heat exchange relationship with said outer casing.
Claim 6
Dependent Claim
30 words
The method of claim 1 wherein said gas turbine blading is heated prior to startup of said turbo machine by passing steam in heat exchange relationship with said turbine blading.
Claim 7
Dependent Claim
100 words
The method of claim 1 wherein said blading comprises stationary veins and rotatable blades, said blading being provided in three stages, a first high pressure stage proximate to the portion of said gas turbine wherein said heated gas enters said turbine, a low pressure stage wherein said blading is proximate to an exhaust portion of said gas turbine and an intermediate pressure stage between said high and low pressure stages, cooling said blading during expansion of said heated gas through said blading by passing steam through the interior of said stationary vanes contained in said intermediate and low pressure stages.
Claim 8
Dependent Claim
55 words
The method of claim 6 comprising cooling said stationary vanes in said high pressure stage during expansion of said heated gas through said blading by passing steam in heat exchange relationship with said stationary vanes in said high pressure stage and subsequently passing said steam to the expanding gas stream passing through said gas turbine.
Claim 9
Dependent Claim
43 words
The method of claim 1 wherein said compressor comprises a plurality of rotating blades confined by an outer compressor casing, cooling said outer compressor casing during compression of said ambient air by passing steam in heat exchange relationship with said outer compressor casing.
Claim 10
Dependent Claim
83 words
The method of claim 2 comprising forming said heated expanding gas by compression said ambient air, igniting a fuel in the presence of said compressed air in a first combustor to form a first heated gas, expanding said first heated gas through the blading of a gas generator turbine to form a first exhaust gas, igniting a fuel in the presence of said first exhaust gas to form a reheated gas and expanding said reheated gas through the blading of said gas turbine.
Claim 11
Dependent Claim
48 words
The method of claim 9 wherein said gas generator turbine comprises a gas generator outer casing confining the blading thereof, cooling said gas generator outer casing during expansion of said heated gas through the blading of said gas generator turbine by passing steam in heat exchange relationship therewith.
Claim 12
Dependent Claim
24 words
The method of claim 9 wherein the ratio of the pressures of said compressed gas to said ambient air is at least about 38.
Claim 13
Dependent Claim
18 words
The method of claim 11 wherein said first heated gas is at a temperature of about 2400° F.
Claim 14
Dependent Claim
19 words
The method of claim 12 wherein said reheated gas is at a temperature of at least about 2400° F.
Claim 15
Dependent Claim
19 words
The method of claim 3 wherein said steam for cooling said outer casing is extracted from a steam turbine.
Claim 16
Dependent Claim
31 words
The method of claim 14 comprising passing the expanding gas leaving said gas turbine in heat exchange relationship with water to produce steam, expanding said produced steam in said steam turbine.
Claim 17
Dependent Claim
60 words
The method of claim 15 comprising expanding said produced steam in a high pressure steam turbine to form a first low pressure steam, expanding said first low pressure steam in an intermediate pressure steam turbine to form a second low pressure steam and expanding said second low pressure steam in a low pressure steam turbine to form an exhaust steam.
Claim 18
Dependent Claim
39 words
The method of claim 16 comprising extracting steam from said high pressure steam turbine and passing said steam in heat exchange relationship with said outer casing, returning said steam from said outer casing to said intermediate pressure steam turbine.
Claim 19
Dependent Claim
94 words
The method of claim 17 wherein said gas turbine comprises an exhaust hood and duct downstream of said turbine blading wherein said expanding gas stream exits said gas turbine, cooling said exhaust hood and duct by extracting steam from said intermediate pressure steam turbine and passing steam extracted from said intermediate pressure steam turbine in heat exchange relationship with said exhaust hood and duct during expansion of said gas through said gas turbine, returning said steam from said heat exchange relationship with said exhaust hood and exhaust duct to said low pressure steam turbine.
Claim 20
Dependent Claim
42 words
The method of claim 18 comprising mixing said second low pressure steam from said intermediate pressure steam turbine and steam passing from heat exchange relationship with said exhaust hood and duct and passing said mixed steam to said low pressure steam turbine.
Claim 21
Dependent Claim
35 words
The method of claim 3 comprising extracting said steam from a steam turbine and passing said extracted steam in heat exchange relationship with said outer casing and subsequently expanding said steam in said steam turbine.
Claim 22
Dependent Claim
28 words
The method of claim 1 wherein said outer casing is heated after trip out of said turbomachinery by passing steam in heat exchange relationship with said outer casing.
Claim 23
Dependent Claim
45 words
The method of claim 1 wherein said compressor comprises a plurality of rotating blades confined by an outer compressor casing, heating said outer compressor casing before start-up of said turbomachinery, cooling said outer compressor casing during compression and heating said outer compressor casing after tripout.
Claim 24
Dependent Claim
28 words
The method of claim 22 wherein said outer compressor casing is heated before startup of said turbomachinery by passing steam in heat exchange relationship with said outer casing.
Claim 25
Dependent Claim
28 words
The method of claim 22 wherein said outer compressor casing is heated after tripout of said turbomachinery by passing steam in heat exchange relationship with said outer casing.
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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) | 1989-02-24 | 1989-08-26 | 1990-02-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-02-24 | 1993-08-26 | 1994-02-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-02-24 | 1997-08-26 | 1998-02-25 | $7700.00 | Window Closed / Lapsed |