GB2318832A - Gas turbine based combined cycle power plant - Google Patents
Gas turbine based combined cycle power plant Download PDFInfo
- Publication number
- GB2318832A GB2318832A GB9711901A GB9711901A GB2318832A GB 2318832 A GB2318832 A GB 2318832A GB 9711901 A GB9711901 A GB 9711901A GB 9711901 A GB9711901 A GB 9711901A GB 2318832 A GB2318832 A GB 2318832A
- Authority
- GB
- United Kingdom
- Prior art keywords
- gas turbine
- combined cycle
- steam
- air
- cycle power
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
- F02C7/00—Features, components parts, details or accessories, not provided for in, or of interest apart form groups F02C1/00 - F02C6/00; Air intakes for jet-propulsion plants
- F02C7/08—Heating air supply before combustion, e.g. by exhaust gases
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K23/00—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids
- F01K23/02—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled
- F01K23/06—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled combustion heat from one cycle heating the fluid in another cycle
- F01K23/10—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled combustion heat from one cycle heating the fluid in another cycle with exhaust fluid of one cycle heating the fluid in another cycle
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
- F02C7/00—Features, components parts, details or accessories, not provided for in, or of interest apart form groups F02C1/00 - F02C6/00; Air intakes for jet-propulsion plants
- F02C7/04—Air intakes for gas-turbine plants or jet-propulsion plants
- F02C7/047—Heating to prevent icing
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/16—Combined cycle power plant [CCPP], or combined cycle gas turbine [CCGT]
Abstract
To reduce fuel consumption under part load conditions in a power plant having a gas turbine exhausting to a heat recovery steam generator supplying a steam turbine, exhaust steam from the steam turbine is passed to a heat exchanger B in which water is heated, the water subsequently being passed to a coil E to preheat inlet air to the gas turbine. Alternatively, the inlet air may be heated directly by low pressure steam generated by the gas turbine exhaust.
Description
A Gas Turbine-based Combined Cycle Electric Power
Generation System with Increased Part-load Efficiencies
The present invention provides a system for gas turbinebased combined cycle power station to increase it's thermal efficiency when operating under part-load conditions since such conventional power stations operate at lower efficiencies at part loads.
This invention relates to higher combined cycle power plant efficiency by decreasing the gas turbine combustion air inlet density due to heating of air at gas turbine intake, thus enabling gas turbine combustion air mass flow to reduce, thereby effectively decreasing absorbed power by gas turbine air compressor and increasing exhaust stream temperature for higher waste heat recovery and thus increased thermal efficiency.
One of the primary advantage of this system design is to decrease fuel consumption during part-load operation of gas turbine-based combined cycle power station, saving considerable fuel since such power stations are required to operate at part-loads during most of the operating life of the plant.
An important aim of the present invention is to provide fuel cost savings in operating the plant at different part-load conditions throughout the year. Additionally, this system design shall also ensure reduction in power station pollution levels due to reduced fuel consumption.
In this present invention, a system utilising low-pressure steam of maximum one bar gauge pressure, from extraction type condensing steam turbines of the combined cycle power station, is used to produce heating of gas turbine intake air either by directly using steam or by first producing hot water in a steam-to-water heat exchanger and then circulating hot water in heating coils installed in gas turbine intake air housing. This system, thus, is used to raise gas turbine combustion air inlet temperature with consequent lowering of air density and mass flow
Presently preferred embodiments of this invention will now be described in connection with the accompanying drawing in which details of invention have been shown in chain-links with the layout of gas turbine-based combined cycle power station for clarity of installation details.
Normal gas turbine operates directly with ambient air inlet for combustion. In combined cycle operation, the gas turbine exhaust heat is recovered to generate steam which is used to produce more power through steam turbine.
However, during part-load conditions specially in comparatively colder climate when ambient air is not hot, combined cycle power station operates at much lower thermal efficiency firstly because of lower part-load gas turbine efficiency and secondly due to lesser amount of waste heat actually recovered for steam generation.
In one aspect of the proposed system, and as shown in the drawing in chain-link, steam is extracted at maximum one bar gauge pressure, at A, from condensing type steam turbine and fed to steam-to-water heat exchanger B, with steam flow control C, for hot water flow in closed cycle with hot water pump D and heating coil E installed in the gas turbine combustion air intake housing. Heating coils shall operate with automatic water flow control valve F to ensure desired air flow temperatures, within gas turbine design requirements. All steam condensate from the heat exchanger at G shall be returned to the boiler feed water system through steam trap, without any consumption of steam or hot water in the system.
Similarly, direct heating of gas turbine inlet air can be achieved with steam heating coils.
In view of the foregoing, it is apparent that the utilisation of the principles of this invention permit, in contrast to conventional gas turbine-based combined cycle power station, operation of such combined cycle power stations with higher efficiencies, and thus reduced fuel consumption, at part load conditions.
Claims (6)
1. A gas turbine-based combined cycle power generation system
to produce intake air heating at part-load conditions, by
utilising low pressure steam either from steam turbine
extraction or direct generation from gas turbine exhaust,
either directly or by conversion to hot water, in heating
coils installed in gas turbine inlet air housing, to
increase part load efficiencies by decreasing gas turbine
combustion air mass flow.
2. Decreased air mass flow at part-load conditions in this
system design will reduce combined cycle power station
fuel consumption, by increasing thermal efficiencies since
absorbed power by air compressor of gas turbine will be
reduced as well as more power will be available from steam
turbine due to increased waste heat recovery.
3. A gas-turbine based combined cycle power generation system
as described hereinbefore with a reference to the
accompanying drawing."
Amendments to the claims have been filed as follows
CLAJMS 1. A gas turbine-based combined cycle power station comprising at least one gas turbine and a steam turbine, each gas turbine having an air inlet housing for combustion air, connected to the intake of an air compressor, the compressor having a compressed air outlet connected to a fuel combustion section and having air heating means positioned in the air inlet housing to produce gas turbine intake air heating at part load conditions.
2. A gas turbine based combined cycle power station according to claim 1, wherein the gas turbine has an exhaust for hot combusted gases, which hot combusted gases serve to heat the intake air.
3. A gas turbine based combined cycle power station according to claim 1, wherein low pressure steam from the steam turbine is used to heat the intake air.
4. A gas turbine based combined cycle power station according to claim 3, wherein the low pressure steam from the steam turbine heats the intake air directly.
5. A gas turbine based combined cycle power station according to claim 3, wherein the low pressure steam from the steam turbine is converted to hot water in a steam to water heat exchanger and the hot water is circulated through a heat coil in the air intake.
6. A gas turbine based combined cycle power station substantially as hereinbefore described with reference to the accompanying drawing.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PK65596 | 1996-11-03 |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB9711901D0 GB9711901D0 (en) | 1997-08-06 |
| GB2318832A true GB2318832A (en) | 1998-05-06 |
| GB2318832B GB2318832B (en) | 2000-07-05 |
Family
ID=19935990
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9711901A Expired - Fee Related GB2318832B (en) | 1996-11-03 | 1997-06-10 | A gas turbine-based combined cycle electric power generation system with increased part-load efficiencies |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2318832B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004057170A1 (en) * | 2002-12-23 | 2004-07-08 | Turbec Ab | Gas turbine power plant |
| EP2351915A1 (en) * | 2010-01-11 | 2011-08-03 | Alstom Technology Ltd | Combined cycle power plant and method of operating such power plant |
| EP2626533A1 (en) * | 2012-02-07 | 2013-08-14 | Siemens Aktiengesellschaft | Method for operating a gas turbine |
| DE102007018420B4 (en) | 2006-04-18 | 2022-07-14 | General Electric Co. | System and method for conditioning gas turbine inlet air |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB658876A (en) * | 1948-12-13 | 1951-10-17 | Bbc Brown Boveri & Cie | Thermal power plant with steam generator and gas turbines for producing useful powerand driving compressors |
| GB899904A (en) * | 1960-04-23 | 1962-06-27 | Babcock & Wilcox Ltd | Improvements in power plants |
-
1997
- 1997-06-10 GB GB9711901A patent/GB2318832B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB658876A (en) * | 1948-12-13 | 1951-10-17 | Bbc Brown Boveri & Cie | Thermal power plant with steam generator and gas turbines for producing useful powerand driving compressors |
| GB899904A (en) * | 1960-04-23 | 1962-06-27 | Babcock & Wilcox Ltd | Improvements in power plants |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004057170A1 (en) * | 2002-12-23 | 2004-07-08 | Turbec Ab | Gas turbine power plant |
| DE102007018420B4 (en) | 2006-04-18 | 2022-07-14 | General Electric Co. | System and method for conditioning gas turbine inlet air |
| EP2351915A1 (en) * | 2010-01-11 | 2011-08-03 | Alstom Technology Ltd | Combined cycle power plant and method of operating such power plant |
| WO2011082949A3 (en) * | 2010-01-11 | 2012-03-08 | Alstom Technology Ltd | Combined cycle power plant and method of operating such power plant |
| EP2626533A1 (en) * | 2012-02-07 | 2013-08-14 | Siemens Aktiengesellschaft | Method for operating a gas turbine |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2318832B (en) | 2000-07-05 |
| GB9711901D0 (en) | 1997-08-06 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 20120610 |