Patent US3142830A successfully refreshed from Google Patents.
US6606864B2
Expired / Lapsed
US
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Advanced multi pressure mode gas turbine
Assignee: Individual
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Filing: 2002-02-01
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Granted: 2003-08-19
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Expires: 2022-02-01
Abstract
Abstract A gas turbine which is capable of operating in more than one pressure mode. The gas turbine, which may include a single fixed spool, multiple fixed spools, or a combination of fixed spool(s) and a free turbine, can operate in a positive pressure mode, a transatmospheric mode, or a subatmospheric mode. Valving is provided to control the particular pressure mode of operation in response to system requirements and to switch between pressure modes as required. The gas turbine is particularly useful with a catalytic combustor where the gas turbine can be started in a mode where the catalytic combustor, and its associated preheater, is at or below atmospheric pressure.
Inventors
- 👤 Robin Mackay
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:51
CPC Classifications
F; F02; F02C; F02C1/00; F02C1/04; F02C1/05; F02C1/06; F02C6/00; F02C6/003; F02C6/006; F02C7/00; F02C7/08; F02C7/10
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
56 words
A method of operating a recuperated gas turbine, comprising: providing valving between the recuperator and the gas turbine compressor; at start up and at low power, setting the valving to operate the gas turbine in a subatmospheric pressure mode; and at high power, setting the valving to operate the gas turbine in a positive pressure mode.
Claim 2
Independent Claim
56 words
A method of operating a recuperated gas turbine, comprising: providing valving between the recuperator and the gas turbine compressor; at start up and at low power, setting the valving to operate the gas turbine in a subatmospheric pressure mode; and at high power, setting the valving to operate the gas turbine in a positive pressure mode.
Claim 3
Dependent Claim
25 words
The method of operating a recuperated gas turbine of claim 1 , and in addition, intercooling the recuperated air delivered to the gas turbine compressor.
Claim 4
Dependent Claim
37 words
The method of operating a recuperated gas turbine of claim 1 , and in addition, setting the valving to operate the gas turbine in a transatmospheric pressure mode at mid power between high power and low power.
Claim 5
Dependent Claim
25 words
The method of operating a recuperated gas turbine of claim 3 , and in addition, intercooling the recuperated air delivered to the gas turbine compressor.
Claim 6
Dependent Claim
20 words
The method of operating a recuperated gas turbine of claim 1 wherein the recuperated gas turbine has a single spool.
Claim 7
Dependent Claim
22 words
The method of operating a recuperated gas turbine of claim 1 wherein the recuperated gas turbine has a spool and a half.
Claim 8
Dependent Claim
19 words
The method of operating a recuperated gas turbine of claim 1 wherein the recuperated gas turbine has two spools.
Claim 9
Dependent Claim
22 words
The method of operating a recuperated gas turbine of claim 1 wherein the recuperated gas turbine has two and one half spools.
Claim 10
Dependent Claim
20 words
The method of operating a recuperated gas turbine of claim 1 wherein the recuperated gas turbine includes a free turbine.
Claim 11
Dependent Claim
18 words
The method of operating a recuperated gas turbine of claim 1 wherein the combustor is a catalytic combustor.
Claim 12
Dependent Claim
18 words
The method of operating a recuperated gas turbine of claim 10 wherein the catalytic combustor includes a preheater.
Claim 13
Dependent Claim
18 words
The method of operating a recuperated gas turbine of claim 3 wherein the combustor is a catalytic combustor.
Claim 14
Dependent Claim
18 words
The method of operating a recuperated gas turbine of claim 12 wherein the catalytic combustor includes a preheater.
Claim 15
Dependent Claim
119 words
A turbogenerator comprising: a gas turbine including a compressor, a turbine, a combustor, a recuperator and a generator; said recuperator receiving compressed air from said compressor to be heated in said recuperator by the expanded exhaust gases from said turbine, said heated compressed air from said recuperator supplied to said combustor to be mixed with fuel and combusted to provide combustion gases for expansion in said turbine which drives said compressor and said generator; valving disposed between said recuperator and said compressor to start said gas turbine in a subatmospheric pressure mode, to operate said gas turbine in a subatmospheric pressure mode at low power, and to operate said gas turbine in a positive pressure mode at high power.
Claim 16
Dependent Claim
119 words
A turbogenerator comprising: a gas turbine including a compressor, a turbine, a combustor, a recuperator and a generator; said recuperator receiving compressed air from said compressor to be heated in said recuperator by the expanded exhaust gases from said turbine, said heated compressed air from said recuperator supplied to said combustor to be mixed with fuel and combusted to provide combustion gases for expansion in said turbine which drives said compressor and said generator; valving disposed between said recuperator and said compressor to start said gas turbine in a subatmospheric pressure mode, to operate said gas turbine in a subatmospheric pressure mode at low power, and to operate said gas turbine in a positive pressure mode at high power.
Claim 17
Dependent Claim
24 words
The turbogenerator of claim 14 wherein said generator is a motor/generator which is operated as a motor during start up of said gas turbine.
Claim 18
Dependent Claim
15 words
The turbogenerator of claim 14 wherein said combustor is a catalytic combustor including a preheater.
Claim 19
Dependent Claim
14 words
The turbogenerator of claim 14 wherein said valving is a plurality of open/close valves.
Claim 20
Dependent Claim
14 words
The turbogenerator of claim 14 wherein said valving includes a plurality of multiple-way valves.
Claim 21
Dependent Claim
118 words
A turbogenerator comprising: a gas turbine including a compressor, a turbine, a catalytic combustor with a preheater, a recuperator and a generator; said recuperator receiving compressed air from said compressor to be heated in said recuperator by the expanded exhaust gases from said turbine, said heated compressed air from said recuperator supplied to said preheated combustor to be mixed with fuel and combusted to provide combustion gases for expansion in said turbine which drives said compressor and said generator; valving disposed between said recuperator and said compressor to operate said gas turbine in a subatmospheric pressure mode at start up and at low power, and to operate said gas turbine in a positive pressure mode at high power.
Claim 22
Dependent Claim
118 words
A turbogenerator comprising: a gas turbine including a compressor, a turbine, a catalytic combustor with a preheater, a recuperator and a generator; said recuperator receiving compressed air from said compressor to be heated in said recuperator by the expanded exhaust gases from said turbine, said heated compressed air from said recuperator supplied to said preheated combustor to be mixed with fuel and combusted to provide combustion gases for expansion in said turbine which drives said compressor and said generator; valving disposed between said recuperator and said compressor to operate said gas turbine in a subatmospheric pressure mode at start up and at low power, and to operate said gas turbine in a positive pressure mode at high power.
Claim 23
Dependent Claim
31 words
The turbogenerator of claim 19 wherein said valving additionally includes means to operate the gas turbine in a transatmospheric pressure mode in a mid power between low power and high power.
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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) | 2006-08-18 | 2007-02-17 | 2007-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2010-08-18 | 2011-02-17 | 2011-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2014-08-18 | 2015-02-17 | 2015-08-19 | $7700.00 | Window Closed / Lapsed |