EP0184137A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Integrated coal gasification plant and combined cycle system with air bleed and steam injection
Assignee: General Electric Co
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Filing: 1985-11-27
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Granted: —
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Expires: 2005-11-27
Abstract
Abstract An integrated coal gasification plant and combined cycle system employs a supply of compressed air 68 bled off at an intermediate pressure from an air compressor 28' portion of a gas turbine 12' to supply the compressed-air needs of an oxygen plant 20 associated with the coal gasification plant 16. The high-temperature exhaust 38 from the turbine section 32 of the gas turbine is employed to generate steam in a heat recovery steam generator 40'. The steam drives a steam turbine 42 to produce additional mechanical output. In order to compensate for the removal of the compressed air 68 fed to the oxygen plant 20, the spent steam 70 from the steam turbine 42 is added to the compressed air and fuel in the combustor portion 30 ' of the gas turbine. The unexpended energy in the steam fed to the combustor is recovered by expansion in the turbine of the gas turbine and by absorption in the heat recovery steam generator. The release of steam through the gas turbine, and other disclosed techniques, permits the use of a non-condensing system and thus permits elimination of the capital cost of a condenser and cooling tower which would otherwise be required. In addition, the direct provision of compressed air to the oxygen plant eliminates the capital and operating cost of the separate compressor and electric motor conventionally required to provide such compressed air.
Inventors
- 👤 Donald Ray Plumley
- 👤 Ashok Kumar Anand
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 05:12
CPC Classifications
F; F01; F01K; F01K21/00; F01K21/04; F01K21/042; F01K23/00; F01K23/02; F01K23/06; F01K23/067; F01K23/068; F02; F02C; F02C7/00; F02C7/22; F02C7/224; Y; Y02; Y02E; Y02E20/00; Y02E20/16; Y02E20/18; Y02P; Y02P20/00; Y02P20/10; Y02P20/129
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
262 words
An integrated combined cycle system comprising: a coal gas plant effective for producing a supply of a gaseous fuel; a gas turbine of a type including an air compressor, a combustor and a turbine; said air compressor being of a type effective to produce a first supply of compressed air said first supply of compressed air having a total mass flow rate; means for connecting said supply of a gaseous fuel from said coal gas plant to said combustor; an- oxygen plant for producing a supply of oxygen for use in said coal gas plant; said oxygen plant being of a type requiring a second supply of compressed air; means for diverting a portion of said first supply of compressed air equal to said second supply of compressed air and for connecting said portion to said oxygen plant; means for supplying a remainder of said first supply of compressed air to said combustor wherein said gaseous fuel is burned with said remainder of said first supply of compressed air; a heat recovery steam generator receiving an exhaust from said turbine and effective for generating a supply of steam; means for applying at least a portion of said supply of steam for expansion in said turbine; and said at least a portion of said supply of steam having a mass flow rate sufficient to substantially compensate for said first supply of compressed air diverted from said air compressor whereby a total mass flow rate through said turbine is substantially equal to said total mass flow rate of said first supply of compressed air.
Claim 2
Dependent Claim
262 words
An integrated combined cycle system comprising: a coal gas plant effective for producing a supply of a gaseous fuel; a gas turbine of a type including an air compressor, a combustor and a turbine; said air compressor being of a type effective to produce a first supply of compressed air said first supply of compressed air having a total mass flow rate; means for connecting said supply of a gaseous fuel from said coal gas plant to said combustor; an- oxygen plant for producing a supply of oxygen for use in said coal gas plant; said oxygen plant being of a type requiring a second supply of compressed air; means for diverting a portion of said first supply of compressed air equal to said second supply of compressed air and for connecting said portion to said oxygen plant; means for supplying a remainder of said first supply of compressed air to said combustor wherein said gaseous fuel is burned with said remainder of said first supply of compressed air; a heat recovery steam generator receiving an exhaust from said turbine and effective for generating a supply of steam; means for applying at least a portion of said supply of steam for expansion in said turbine; and said at least a portion of said supply of steam having a mass flow rate sufficient to substantially compensate for said first supply of compressed air diverted from said air compressor whereby a total mass flow rate through said turbine is substantially equal to said total mass flow rate of said first supply of compressed air.
Claim 3
Dependent Claim
45 words
An integrated combined cycle system according to claim 1, wherein said at least a portion of said supply of steam supplied to said turbine is sufficient to permit operation of said combined cycle system as a non-condensing system in which a condenser is not required.
Claim 4
Dependent Claim
44 words
An integrated combined cycle system according to claim 1, wherein said means for supplying at least a portion of said steam includes steam turbine means for partially expanding said steam and for delivering partially expanded steam to said gas turbine for additional expansion therein.
Claim 5
Dependent Claim
41 words
An integrated combined cycle system according to claim 3 wherein said means for supplying at least a portion of said supply of steam includes means for supplying an additional portion of steam which has not been expanded in said steam turbine.
Claim 6
Dependent Claim
18 words
An integrated combined cycle system according to claim 4 wherein said combined cycle system is a non-condensing system.
Claim 7
Dependent Claim
32 words
An integrated combined cycle system according to claim 4 wherein said means for connecting said supply of gaseous fuel includes means for heating said gaseous fuel before connection thereof to said combustor.
Claim 8
Dependent Claim
52 words
An integrated combined cycle system according to claim 6 wherein said means for heating said gaseous fuel includes a heat exchanger and means for passing a supply of at least one of a heated water and a steam from said heat recovery steam generator therethrough for heat exchange to said gaseous fuel.
Claim 9
Dependent Claim
50 words
An integrated combined cycle system according to claim 7 further comprising: a de-aerator; means for feeding said at least one of a heated water and a steam from said heat exchanger to said de-aerator; and a feedwater pump for pumping feedwater from said de-aerator to said heat recovery steam generator-
Claim 10
Dependent Claim
59 words
An integrated combined cycle system according to claim 7 wherein an amount of said at least a portion of said steam applied to said turbine and said amount of said at least one of a heated water and a steam fed to said heat exchanger is sufficient to permit operation of said combined cycle system as a non-condensing system.
Claim 11
Dependent Claim
54 words
An integrated combined cycle system according to claim 1 wherein said means for applying at least a portion of said steam for expansion in said turbine includes means for feeding said steam to said combustor wherein said steam is effective for =educing a combustion temperature within said combustor whereby a NOx emission is reduced.
Claim 12
Dependent Claim
39 words
An integrated combined cycle system according to claim 1 further comprising means for supplying additional fuel to said heat recovery steam generator for combustion therein whereby a quantity of steam generated in said heat recovery steam generator is increased.
Claim 13
Dependent Claim
42 words
An integrated combined cycle system according to claim 1 wherein said coal gas plant is of a type which produces at least some process steam and said combined cycle system includes means for accepting at least a portion of said process steam.
Claim 14
Dependent Claim
63 words
An integrated combined cycle system according to claim 1 wherein said portion of said first supply of compressed air is up 10 20 percent of said first supply of compressed air and said at least a portion of said steam applied for expansion in said turbine has a mass flow rate substantially up to 20 percent of said first supply of compressed air.
References Cited (Backward Citations)
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