WO1997018386A1 - System and method for combustion turbine repowering of existing low superheat steam turbines - Google Patents
System and method for combustion turbine repowering of existing low superheat steam turbines Download PDFInfo
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- WO1997018386A1 WO1997018386A1 PCT/US1996/015387 US9615387W WO9718386A1 WO 1997018386 A1 WO1997018386 A1 WO 1997018386A1 US 9615387 W US9615387 W US 9615387W WO 9718386 A1 WO9718386 A1 WO 9718386A1
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Classifications
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- 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
- F01K23/106—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 with water evaporated or preheated at different pressures in exhaust boiler
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21D—NUCLEAR POWER PLANT
- G21D5/00—Arrangements of reactor and engine in which reactor-produced heat is converted into mechanical energy
- G21D5/04—Reactor and engine not structurally combined
- G21D5/08—Reactor and engine not structurally combined with engine working medium heated in a heat exchanger by the reactor coolant
- G21D5/12—Liquid working medium vaporised by reactor coolant
- G21D5/16—Liquid working medium vaporised by reactor coolant superheated by separate heat source
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- 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]
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- 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
- Y02E30/00—Energy generation of nuclear origin
Definitions
- the present invention relates to a system and method for repowering existing low superheat steam turbine systems, in particular, nuclear powered low superheat steam turbine systems.
- FIG 1 is a diagram of a low superheat steam turbine system 10. These systems or similar systems have been used in nuclear power plant applications.
- a nuclear reactor is the primary component of the steam generator 20 shown in Figure 1.
- the nuclear reactor steam generator typically produces low superheat steam 22 having pressure ranging from 600 to 1000 pounds per square inch atmosphere (“psia”) and temperature about 600°F.
- the low superheat steam 22 is expanded and converted into mechanical energy by a low superheat steam high pressure (“HP”) turbine 30.
- Exhaust steam 32 from the HP turbine 30 is used to drive two or more low pressure (“LP”) turbines 40 and 50.
- LP low pressure
- the HP turbine 30 and series of LP steam turbines 40 and 50 are usually combined on one shaft 12 drive line in a tandem compound arrangemen .
- the shaft 12 is also connected to a four pole electric generator 60 and the shaft 12 rotates at about 1800 revolutions per minute ("RPM") for 60Hz electric power systems (1500 RPM for 50Hz electric power systems) during normal operation.
- RPM revolutions per minute
- Two condensers 70 and 80 receive exhaust steam 42 and 52 from the LP steam turbines and generate condensed steam 72 and 82 which is piped back to the steam generator 20.
- a water cooler 90 cycles water 92 and 94 to the condensers 70 and 80 to remove heat from the exhaust steam 42 and 52.
- the water cooler 90 may be a cooling tower, lake, or other source of cooled water.
- the low superheat steam HP turbine 30 of the low superheat steam turbine system 10 is replaced with a new superheat steam HP turbine capable of operation at modern steam conditions (pressure 1600 to 3600 psia, temperature 1000-1100°F) .
- This second approach eliminates the inefficiency associated with the first approach, but utilizes less of the existing equipment of the turbine system 10.
- the present invention provides an efficient combined cycle power plant system for repowering an existing low superheat steam turbine system.
- the system and method of the invention provide low superheat steam for the low superheat turbine system from a superheat steam high pressure (“HP") turbine coupled to the turbine system.
- the superheat steam HP turbine receives superheat steam, expands the steam, and generates low superheat steam at conditions suitable for the low superheat steam turbine system.
- the superheat steam HP turbine is part of a combined cycle power plant system which includes a gas turbine and heat recovery steam generator ("HRSG") .
- the gas turbine receives high temperature, compressed gas and generates mechanical energy and expanded exhaust gas.
- the HRSG receives condensed steam and the expanded exhaust gas, extracts heat from the exhaust gas, applies the extracted heat to the condensed steam, and generates superheat steam at steam conditions suitable for the superheat steam HP turbine.
- the HRSG also extracts further heat from the exhaust gas, applies the further extracted heat to the condensed steam and generates low superheat steam at steam conditions suitable for at least one low pressure (“LP”) steam turbine system of the low superheat steam turbine system.
- LP low pressure
- the low pressure steam turbine system includes at least one LP steam turbine which is coupled to the low superheat steam HP turbine through a common shaft.
- Low superheat exhaust steam generated by the low superheat steam HP turbine is also directed to the at least one LP steam turbine.
- the expansion of low superheat steam by both the low superheat steam HP turbine and the at least one LP steam turbine of the low superheat steam turbine system generates mechanical energy in the form of torque on the common shaft of the system.
- the torque on the common shaft is converted to electrical energy by an electric generator which is also coupled to the common shaft of the low superheat steam turbine system.
- the low superheat steam turbine system also includes at least condenser for condensing the exhaust generated by the at least one LP steam turbine and a water cooler for providing cool water to the condenser.
- the combined cycle power plant also includes an electric generator.
- the electric generator is coupled to a common shaft of the power plant to which the superheat steam HP turbine and gas turbine are also coupled.
- the superheat steam HP turbine and gas turbine both generate mechanical energy in the form of torque on the common shaft when they expand superheat steam and high temperature compressed gas, respectively.
- the condensed steam generated by at least one condenser of the low superheat steam turbine system is provided to the heat recovery steam generator of the combined cycle power plant.
- the heat recovery steam generator applies heat it extracts from the expanded exhaust gas to the condensed steam to generate high superheat steam and low superheat steam.
- Figure 1 is a diagram illustrative of a prior art low superheat steam turbine system.
- Figure 2 is a diagram of a preferred embodiment of a combined cycle repowered low superheat steam turbine system.
- FIG. 2 A preferred embodiment of a repowered low superheat steam turbine system 100 is presented with reference to Figure 2.
- the system 100 includes a turbine system similar to the system shown in Figure 1 except that a combined cycle power plant 200 replaces the steam generator 20.
- the system shown in Figure 2 includes a low superheat steam HP turbine 30, series of LP steam turbines 40 and 50, condensers 70 and 80, electric generator 60 and water cooler 90 of an existing low superheat steam turbine system.
- the combined cycle power plant 200 includes a gas turbine 130 (gas cycle) and superheat steam HP turbine 140 (steam cycle) .
- the gas turbine 130 and superheat steam HP turbine 140 are linked together to form a combined cycle power plant by a Heat Recovery Steam Generator ("HRSG") 120.
- HRSG Heat Recovery Steam Generator
- Low superheat exhaust steam 142 at the primitive steam conditions for the original low superheat steam HP turbine 30 of the low superheat steam turbine system 10 is generated by the combined cycle power plant 200.
- low pressure steam 124 at the steam conditions suitable for the series of LP steam turbines 40 and 50 is generated by the combined cycle power plant 200.
- the combined cycle power plant 200 includes compressor 150, a combustor 110, gas turbine 130, HRSG 120, HP steam turbine 140, and an electric generator 160.
- the superheat steam HP turbine 140, electric generator 160, compressor 150 and gas turbine 130 are connected on one shaft line 180.
- atmospheric gas is provided to the compressor 150 from the air inlet 170.
- the compressor generates compressed gas 152 from the atmospheric gas.
- the combustor 110 receives fossil fuels (not shown) and the compressed gas 152 and generates high temperature gas 112.
- the gas turbine 130 expands the high temperature, compressed gas 112 and generates mechanical energy in the form of torque on the shaft 180 and expanded superheat exhaust gas 132.
- the HRSG receives the expanded superheat exhaust gas 132 from the gas turbine 130 and condensed steam 82 from the pair of condensers 70 and 80 and extracts heat from the expanded exhaust gas 132 in a multi-stage process.
- heat is extracted from the expanded exhaust gas 132 and applied to condensed steam 82 to generate superheat steam 122 at steam conditions suitable for the modern superheat steam HP turbine 140, i.e., superheat steam 122 with pressure in the range of 1000 psia to 3600 psia and temperature about 1000-1100°F.
- the superheat steam HP turbine 140 receives the superheat steam 122 from the HRSG 120 and generates mechanical energy in the form of torque on the shaft 180 and low superheat exhaust steam 142.
- the superheat steam HP turbine 140 is a high efficiency turbine which operates at modern steam turbine pressures and temperatures and rotates at 3600 or 3000 RPM.
- the low superheat exhaust steam 142 generated by the superheat steam HP turbine 140 is at steam conditions suitable for the low superheat steam HP turbine 30 of the low superheat steam turbine system 10.
- the low superheat steam 142 is provided to the inlet of the low superheat steam HP turbine 30 via a high efficiency thermal piping (not shown) .
- the low superheat steam HP turbine 30 expands the low superheat steam 142 and generates mechanical energy and low superheat exhaust steam 32 used by the series of LP steam turbines 40 and 50.
- the combined cycle system of the gas turbine 130 and superheat steam HP turbine 140 provide the steam necessary for the powering or repowering of a low superheat steam turbine system.
- the electric generator 160 converts the torque on the shaft 180 generated by the superheat steam HP turbine 140 and gas turbine 130 into electric energy.
- the electric generator 160 is a two pole electric generator.
- the gas turbine, HRSG 120, and superheat steam HP turbine 140 thus, form an efficient combined cycle power plant which generates electric energy and low superheat exhaust steam at steam conditions suitable for both the low superheat steam HP turbine 30 and series of LP steam turbines 70 and 80 of the low superheat steam turbine 10 (to power or repower the low superheat steam turbine system) .
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Abstract
A method and system for providing steam to a low superheat steam turbine (30, 40, 50). A combined cycle power plant (100), including a gas turbine (130) and a superheat steam turbine (140) coupled together by a heat recovery steam generator (120), generates the steam (142) for the low superheat steam turbine system (30, 40, 50) from expanded superheat exhaust steam generated by the superheat steam turbine (140).
Description
SYSTEM AND METHOD FOR COMBUSTION TURBINE REPOWERING OF EXISTING LOW SUPERHEAT STEAM TURBINES
FIELD OF THE INVENTION
The present invention relates to a system and method for repowering existing low superheat steam turbine systems, in particular, nuclear powered low superheat steam turbine systems.
BACKGROUND OF THE INVENTION
Figure 1 is a diagram of a low superheat steam turbine system 10. These systems or similar systems have been used in nuclear power plant applications. In such a system, a nuclear reactor is the primary component of the steam generator 20 shown in Figure 1. The nuclear reactor steam generator typically produces low superheat steam 22 having pressure ranging from 600 to 1000 pounds per square inch atmosphere ("psia") and temperature about 600°F. The low superheat steam 22 is expanded and converted into mechanical energy by a low superheat steam high pressure ("HP") turbine 30. Exhaust steam 32 from the HP turbine 30 is used to drive two or more low pressure ("LP") turbines 40 and 50.
The HP turbine 30 and series of LP steam turbines 40 and 50 are usually combined on one shaft 12 drive line in a tandem compound arrangemen . The shaft 12 is also connected to a four pole electric generator 60 and the shaft 12 rotates at about 1800 revolutions per minute ("RPM") for 60Hz electric power systems (1500 RPM for 50Hz electric power systems) during normal operation. Two condensers 70 and 80 receive
exhaust steam 42 and 52 from the LP steam turbines and generate condensed steam 72 and 82 which is piped back to the steam generator 20. A water cooler 90 cycles water 92 and 94 to the condensers 70 and 80 to remove heat from the exhaust steam 42 and 52. The water cooler 90 may be a cooling tower, lake, or other source of cooled water.
When a steam generator 20 of a turbine system 10 approaches or reaches the end of its operational life or, in some cases, or is never brought on-line, alternative steam generators, in particular, fossil fuel steam generators are sought to "repower" these existing low superheat steam turbine systems 10. Gas turbines with heat recovery steam generators ("HRSG") have been used in two general approaches of combined cycle repowering of existing low superheat steam turbine systems. In one approach, the gas turbine/HRSG is used to generate low superheat steam at the primitive steam conditions for the original HP turbine 30 of the low superheat steam turbine system 10. This results in poor energy conversion efficiency as compared to the energy efficiencies of new combined cycle plant systems.
In the second approach, the low superheat steam HP turbine 30 of the low superheat steam turbine system 10 is replaced with a new superheat steam HP turbine capable of operation at modern steam conditions (pressure 1600 to 3600 psia, temperature 1000-1100°F) . This second approach eliminates the inefficiency associated with the first approach, but utilizes less of the existing equipment of the turbine system 10. Thus, a need exists for a combined plant system which utilizes the existing equipment of a low superheat steam turbine system 10 and is efficient as modern combined cycle power plant systems.
SUMMARY OF THE INVENTION
The present invention provides an efficient combined cycle power plant system for repowering an existing low superheat steam turbine system. The system and method of the invention provide low superheat steam for the low superheat turbine system from a superheat steam high pressure ("HP") turbine coupled to the turbine system. The superheat steam HP turbine receives superheat steam, expands the steam, and generates low superheat steam at conditions suitable for the low superheat steam turbine system.
The superheat steam HP turbine is part of a combined cycle power plant system which includes a gas turbine and heat recovery steam generator ("HRSG") . The gas turbine receives high temperature, compressed gas and generates mechanical energy and expanded exhaust gas. The HRSG receives condensed steam and the expanded exhaust gas, extracts heat from the exhaust gas, applies the extracted heat to the condensed steam, and generates superheat steam at steam conditions suitable for the superheat steam HP turbine. The HRSG also extracts further heat from the exhaust gas, applies the further extracted heat to the condensed steam and generates low superheat steam at steam conditions suitable for at least one low pressure ("LP") steam turbine system of the low superheat steam turbine system. The low pressure steam turbine system includes at least one LP steam turbine which is coupled to the low superheat steam HP turbine through a common shaft. Low superheat exhaust steam generated by the low superheat steam HP turbine is also directed to the at least one LP steam turbine. The expansion of low superheat steam by both the low superheat steam HP turbine and the at least one LP steam turbine of the low superheat steam turbine system generates mechanical energy in the form of torque on the common shaft of the system. The torque on the common shaft is converted to electrical energy by an electric generator which is also coupled to the common shaft of the low superheat steam turbine system. The low superheat steam turbine system also includes
at least condenser for condensing the exhaust generated by the at least one LP steam turbine and a water cooler for providing cool water to the condenser.
The combined cycle power plant also includes an electric generator. The electric generator is coupled to a common shaft of the power plant to which the superheat steam HP turbine and gas turbine are also coupled. The superheat steam HP turbine and gas turbine both generate mechanical energy in the form of torque on the common shaft when they expand superheat steam and high temperature compressed gas, respectively.
Finally, the condensed steam generated by at least one condenser of the low superheat steam turbine system is provided to the heat recovery steam generator of the combined cycle power plant. The heat recovery steam generator applies heat it extracts from the expanded exhaust gas to the condensed steam to generate high superheat steam and low superheat steam.
BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a diagram illustrative of a prior art low superheat steam turbine system.
Figure 2 is a diagram of a preferred embodiment of a combined cycle repowered low superheat steam turbine system.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
A preferred embodiment of a repowered low superheat steam turbine system 100 is presented with reference to Figure 2. As shown in Figure 2, the system 100 includes a turbine system similar to the system shown in Figure 1 except that a combined cycle power plant 200 replaces the steam generator 20. In particular, the system shown in Figure 2 includes a low superheat steam HP turbine 30, series of LP steam turbines 40 and 50, condensers 70 and 80, electric generator 60 and water cooler 90 of an existing low superheat steam turbine system.
The combined cycle power plant 200 includes a gas turbine 130 (gas cycle) and superheat steam HP turbine 140 (steam cycle) . The gas turbine 130 and superheat steam HP turbine 140 are linked together to form a combined cycle power plant by a Heat Recovery Steam Generator ("HRSG") 120. Low superheat exhaust steam 142 at the primitive steam conditions for the original low superheat steam HP turbine 30 of the low superheat steam turbine system 10 is generated by the combined cycle power plant 200. In addition, low pressure steam 124 at the steam conditions suitable for the series of LP steam turbines 40 and 50 is generated by the combined cycle power plant 200.
In detail, the combined cycle power plant 200 includes compressor 150, a combustor 110, gas turbine 130, HRSG 120, HP steam turbine 140, and an electric generator 160. The superheat steam HP turbine 140, electric generator 160, compressor 150 and gas turbine 130 are connected on one shaft line 180. In operation, atmospheric gas is provided to the compressor 150 from the air inlet 170. The compressor generates compressed gas 152 from the atmospheric gas. The combustor 110 receives fossil fuels (not shown) and the compressed gas 152 and generates high temperature gas 112. The gas turbine 130 expands the high temperature, compressed gas 112 and generates mechanical energy in the form of torque on the shaft 180 and expanded superheat exhaust gas 132.
The HRSG receives the expanded superheat exhaust gas 132 from the gas turbine 130 and condensed steam 82 from the pair of condensers 70 and 80 and extracts heat from the expanded exhaust gas 132 in a multi-stage process. During a first stage, heat is extracted from the expanded exhaust gas 132 and applied to condensed steam 82 to generate superheat steam 122 at steam conditions suitable for the modern superheat steam HP turbine 140, i.e., superheat steam 122 with pressure in the range of 1000 psia to 3600 psia and temperature about 1000-1100°F. During a second stage, further heat is extracted from the expanded superheat exhaust gas 132 and applied to condensed steam 82 to generate low pressure steam 124 at steam conditions suitable for the series of LP steam turbines 40 and 50. The superheat steam HP turbine 140 receives the superheat steam 122 from the HRSG 120 and generates mechanical energy in the form of torque on the shaft 180 and low superheat exhaust steam 142. The superheat steam HP turbine 140 is a high efficiency turbine which operates at modern steam turbine pressures and temperatures and rotates at 3600 or 3000 RPM. The low superheat exhaust steam 142 generated by the superheat steam HP turbine 140 is at steam conditions suitable for the low superheat steam HP turbine 30 of the low superheat steam turbine system 10. The low superheat steam 142 is provided to the inlet of the low superheat steam HP turbine 30 via a high efficiency thermal piping (not shown) . The low superheat steam HP turbine 30 expands the low superheat steam 142 and generates mechanical energy and low superheat exhaust steam 32 used by the series of LP steam turbines 40 and 50. Thus, the combined cycle system of the gas turbine 130 and superheat steam HP turbine 140 provide the steam necessary for the powering or repowering of a low superheat steam turbine system.
The electric generator 160 converts the torque on the shaft 180 generated by the superheat steam HP turbine 140 and gas turbine 130 into electric energy. The electric generator 160 is a two pole electric generator. The gas
turbine, HRSG 120, and superheat steam HP turbine 140, thus, form an efficient combined cycle power plant which generates electric energy and low superheat exhaust steam at steam conditions suitable for both the low superheat steam HP turbine 30 and series of LP steam turbines 70 and 80 of the low superheat steam turbine 10 (to power or repower the low superheat steam turbine system) .
Although the invention has been described in terms of an exemplary embodiment, the spirit and scope of the appended claims are unlimited by any details not expressly stated in the claims.
Claims
1. A system for providing low superheat steam for a low superheat steam turbine system, comprising a superheat steam high pressure ("HP") turbine coupled to the turbine system, the superheat steam HP turbine generating low superheat exhaust steam at steam conditions suitable for the low superheat steam turbine system.
2. A system according to claim 1, further comprising: a gas turbine; and a heat recovery steam generator ("HRSG") coupled to the gas turbine and the superheat steam HP turbine, the gas turbine generating exhaust gas and the HRSG receiving the exhaust gas generated by the gas turbine and generating superheat steam at steam conditions suitable for the superheat steam HP turbine.
3. A system according to claim 2, the low superheat steam turbine system including a low superheat steam HP turbine coupled to the superheat steam HP turbine, the low superheat steam HP turbine receiving the low superheat exhaust steam generated by the superheat steam HP turbine.
4. A system according to claim 3, the low superheat steam turbine system further including at least one LP steam turbine coupled to the low superheat HP turbine and the HRSG, wherein the HRSG generates low pressure steam at conditions suitable for the at least one LP steam turbine and the at least one LP steam turbine receives exhaust steam generated by the low superheat steam HP turbine and low pressure steam generated by the HRSG.
5. A system according to claim 4, further comprising: a compressor coupled to an air inlet, the compressor receiving atmospheric gas from the air inlet and generating compressed gas from the atmospheric gas; and a combustor coupled to the gas turbine and compressor, the combustor receiving compressed gas from the compressor and generating high temperature compressed gas, wherein the gas turbine receives the high temperature compressed gas, expands the superheat compressed gas, generates mechanical torque on a shaft from the expansion of the superheat compressed gas, and generates the exhaust gas.
6. A system for providing low superheat steam for a low superheat steam turbine system having a low superheat steam high pressure ("HP") turbine and at least one low pressure ("LP") steam turbine, the system comprising: a compressor coupled to an air inlet, the compressor receiving atmospheric gas from the air inlet and generating compressed gas from the atmospheric gas; a combustor coupled to the compressor, the combustor receiving compressed gas from the compressor and generating high temperature compressed gas; a shaft; a gas turbine coupled to the combustor and shaft, the gas turbine receiving the high temperature compressed gas, expanding the high temperature compressed gas, generating mechanical torque on the shaft from the expansion of the high temperature compressed gas, and generating exhaust gas; a heat recovery steam generator ("HRSG") coupled to the gas turbine and the at least one LP steam turbine, the HRSG receiving the exhaust gas generated by the gas turbine, generating high pressure superheat steam, and generating low pressure steam at steam conditions suitable for the at least one LP steam turbine; a superheat steam HP turbine coupled to the low superheat steam HP turbine, shaft, and HRSG, the superheat steam HP turbine receiving the high pressure superheat steam generated by the HRSG, expanding the superheat steam, generating mechanical torque on the shaft from the expansion of the superheat steam, and generating low superheat exhaust steam at steam conditions suitable for the low superheat steam HP turbine; and an electric generator coupled to the shaft, the electric generator generating electrical energy from the torque on the shaft.
7. A combined cycle power plant system, comprising: a first shaft; a low superheat steam high pressure ("HP") turbine coupled to the first shaft; a second shaft; a superheat steam HP turbine coupled to second shaft and the low superheat steam HP turbine, the superheat steam HP turbine generating low superheat exhaust steam at steam conditions suitable for the low superheat steam HP turbine.
8. A system according to claim 7, further comprising: a gas turbine coupled to the second shaft and generating exhaust gas; and a heat recovery steam generator ("HRSG") coupled to the gas turbine and the superheat steam HP steam turbine, the HRSG receiving the exhaust gas generated by the gas turbine, and generating superheat steam at steam conditions suitable for the superheat steam HP turbine.
9. A system according to claim 8, further comprising: at least one LP steam turbine coupled to the first shaft and the low superheat HP turbine, the at least one LP steam turbine receiving exhaust steam generated by the low superheat steam HP turbine, wherein the HRSG is coupled to the at least one LP steam turbine and generates low superheat steam at conditions suitable for the at least one LP steam turbine.
10. A system according to claim 9, further comprising: a compressor coupled to an air inlet and second shaft, the compressor receiving atmospheric gas from the air inlet and generating compressed gas from the atmospheric gas; and a combustor coupled to the gas turbine and compressor, the combustor receiving compressed gas from the compressor and generating high temperature compressed gas, wherein the gas turbine receives the high temperature compressed gas, expands the high temperature compressed gas, generates mechanical torque on the second shaft from the expansion of the high temperature compressed gas, and generates the exhaust gas.
11. A system according to claim 10, further comprising: at least one condenser coupled to the at least one LP steam turbine, the at least one condenser receiving exhaust steam from the at least one LP steam turbine, and generating condensed steam, wherein the HRSG is coupled to the at least one condenser and receives condensed steam from the at least one condenser.
12. A combined cycle power plant system, comprising: a first shaft; a low superheat steam high pressure ("HP") turbine coupled to the first shaft, the low superheat steam HP turbine receiving low superheat steam, expanding the low superheat steam, generating mechanical torque on the first shaft from the expansion of the low superheat steam, and generating low superheat exhaust steam; at least one low pressure ("LP") steam turbine coupled to the first shaft and the low superheat steam HP turbine, the at least one LP steam turbine receiving low superheat exhaust steam generated by the low superheat steam HP turbine, expanding the low superheat exhaust steam, generating mechanical torque on the first shaft from the expansion of the low superheat exhaust steam, and generating low superheat exhaust steam; at least one condenser coupled to the at least one LP steam turbine, the at least one condenser receiving low superheat exhaust steam from the at least one LP steam turbine, and generating condensed steam; a first electric generator coupled to the first shaft, the first electric generator generating electrical energy from the torque on the first shaft; a second shaft; a compressor coupled to an air inlet and second shaft, the compressor receiving atmospheric gas from the air inlet and generating compressed gas from the atmospheric gas; a combustor coupled to the compressor, the combustor receiving compressed gas from the compressor and generating high temperature compressed gas; a gas turbine coupled to the combustor and second shaft, the gas turbine receiving the high temperature compressed gas, expanding the high temperature compressed gas, generating mechanical torque on the second shaft from the expansion of the high temperature compressed gas, and generating exhaust gas; a heat recovery steam generator ("HRSG") coupled to the gas turbine, the at least condenser, and the at least one LP steam turbine, the HRSG receiving the exhaust gas generated by the gas turbine and condensed steam generated by the at least one condenser, generating superheat steam and low pressure steam at steam conditions suitable for the at least one LP steam turbine by extracting heat from the exhaust gas and applying the extracted heat to the condensed steam; a superheat steam HP turbine coupled to the low superheat steam HP turbine, second shaft, and HRSG, the superheat steam HP turbine receiving the superheat steam generated by the HRSG, expanding the superheat steam, generating mechanical torque on the second shaft from the expansion of the superheat steam, and generating low superheat exhaust steam at steam conditions suitable for the low superheat steam HP turbine; and a second electric generator coupled to the second shaft, the second electric generator generating electrical energy from the torque on the second shaft.
13. A method for providing low superheat steam for a low superheat steam turbine system, comprising the steps of: coupling a superheat steam high pressure ("HP") turbine to the turbine system; generating low superheat exhaust steam at steam conditions suitable for the low superheat steam turbine system from the superheat steam HP turbine; and providing the low superheat exhaust steam to the low superheat steam turbine system.
14. A method according to claim 13, further comprising steps of: generating high temperature exhaust gas from a gas turbine; extracting heat from the high temperature exhaust gas; generating superheat steam at steam conditions suitable for the superheat steam HP turbine from the extracted heat; and providing the superheat steam to the superheat steam
HP turbine.
15. A method according to claim 14 further comprising the steps of: coupling the superheat steam HP turbine to a low superheat steam HP turbine of the low superheat steam turbine; and providing the low superheat exhaust steam generated by the superheat steam HP turbine to the low superheat steam HP turbine.
16. A method according to claim 15, further comprising the steps of: coupling the low superheat HP turbine to at least one LP steam turbine; generating low superheat exhaust steam from the low superheat steam HP turbine; providing the low superheat exhaust steam from the low superheat steam HP turbine to the at least one LP steam turbine; extracting additional heat from the superheat exhaust gas generated from the gas turbine; generating low superheat steam at steam conditions suitable for the at least one LP steam turbine from the extracted heat; and providing the low superheat steam to the at least one LP steam turbine.
17. A method according to claim 16, further comprising the steps of: receiving atmospheric gas from the air inlet; generating compressed gas from the atmospheric gas; generating high temperature compressed gas from the compressed gas; providing the high temperature compressed gas to the gas turbine; expanding the high temperature compressed gas in the gas turbine; and generating mechanical torque on a shaft from the expansion of the high temperature compressed gas.
18. A method for operating a combined cycle power plant, comprising the steps of: a) receiving atmospheric gas from an air inlet; b) generating compressed gas from the atmospheric gas; c) generating high temperature compressed gas from the compressed gas; d) providing the high temperature compressed gas to a gas turbine; e) expanding the high temperature compressed gas in the gas turbine; f) generating mechanical torque on a first shaft from the expansion of the high temperature compressed gas; g) receiving the expanded high temperature gas generated by the gas turbine; h) extracting heat from the expanded high temperature gas; i) generating superheat steam at steam conditions suitable for a superheat steam HP turbine from the extracted heat; j ) providing the superheat steam to the superheat steam HP turbine; k) extracting further heat from the expanded high temperature gas generated by the gas turbine; 1) generating low pressure steam at steam conditions suitable for at least one LP steam turbine from the extracted heat; m) providing the low pressure steam to the at least one LP steam turbine; n) providing the superheat steam to the superheat steam HP turbine; o) expanding the superheat steam in the superheat steam HP turbine; p) generating mechanical torque on the first shaf from the expansion of the superheat steam; q) generating low superheat steam at steam conditions suitable for a low superheat steam HP turbine from the expanded superheat steam generated by the superheat steam HP turbine; r) providing the low superheat steam generated from the expanded superheat steam to the low superheat steam HP turbine; s) expanding the low superheat steam in the low superheat steam HP turbine; t) generating mechanical torque on a second shaft from the expansion of the low superheat steam in the low superheat steam HP turbine; u) providing the expanded low superheat steam generated by the low superheat steam HP turbine to the at least one LP steam turbine; v) expanding the expanded low superheat steam received from the low superheat steam HP turbine and low pressure steam generated from the heat extracted from the exhaust gas of the gas turbine in the at least one LP steam turbine; w) generating mechanical torque on the second shaft from the expansion of the low superheat steam in the at least one LP steam turbine; x) providing the mechanical torque on the first shaft generated by the superheat HP turbine and the gas turbine to a first electric generator; y) generating electric energy in the first electric generator from the provided mechanical torque; z) providing the mechanical torque on the second shaft generated by the low superheat HP turbine and the at least one LP steam turbine to a second electric generator,- and aa) generating electric energy in the second electric generator from the provided mechanical torque.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US55743895A | 1995-11-14 | 1995-11-14 | |
| US08/557,438 | 1995-11-14 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO1997018386A1 true WO1997018386A1 (en) | 1997-05-22 |
Family
ID=24225388
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/US1996/015387 Ceased WO1997018386A1 (en) | 1995-11-14 | 1996-09-26 | System and method for combustion turbine repowering of existing low superheat steam turbines |
Country Status (1)
| Country | Link |
|---|---|
| WO (1) | WO1997018386A1 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002084080A1 (en) * | 2001-04-09 | 2002-10-24 | Alstom (Switzerland) Ltd | Steam power plant provided with a retrofit kit and method for retrofitting a steam power plant |
| EP1111198A3 (en) * | 1999-12-23 | 2003-05-21 | ALSTOM (Switzerland) Ltd | Method for retro-fitting a saturated steam producing system with at least one steam turbo group and accordingly retro-fitted steam power plant |
| EP2551475A2 (en) | 2011-07-28 | 2013-01-30 | Babcock Borsig Steinmüller GmbH | Rééquipement d'une centrale nucléaire |
| WO2021160367A1 (en) * | 2020-02-11 | 2021-08-19 | Siemens Aktiengesellschaft | Repowering steam turbine facility, and facility |
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| DE4103228A1 (en) * | 1991-02-02 | 1992-08-06 | Radebeul Energie Umwelt | Super heating in combined steam and gas turbine power station plant - uses available heat of combined steam and gas turbine sets to give increased efficiency in old plant |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| DE4103228A1 (en) * | 1991-02-02 | 1992-08-06 | Radebeul Energie Umwelt | Super heating in combined steam and gas turbine power station plant - uses available heat of combined steam and gas turbine sets to give increased efficiency in old plant |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1111198A3 (en) * | 1999-12-23 | 2003-05-21 | ALSTOM (Switzerland) Ltd | Method for retro-fitting a saturated steam producing system with at least one steam turbo group and accordingly retro-fitted steam power plant |
| WO2002084080A1 (en) * | 2001-04-09 | 2002-10-24 | Alstom (Switzerland) Ltd | Steam power plant provided with a retrofit kit and method for retrofitting a steam power plant |
| US7458219B2 (en) | 2001-04-09 | 2008-12-02 | Alstom Technology Ltd. | Steam power plant provided with a retrofit kit and method for retrofitting a steam power plant |
| EP2551475A2 (en) | 2011-07-28 | 2013-01-30 | Babcock Borsig Steinmüller GmbH | Rééquipement d'une centrale nucléaire |
| DE102011108711A1 (en) | 2011-07-28 | 2013-01-31 | Babcock Borsig Steinmüller Gmbh | Conversion of a nuclear power plant |
| WO2021160367A1 (en) * | 2020-02-11 | 2021-08-19 | Siemens Aktiengesellschaft | Repowering steam turbine facility, and facility |
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