CN110685757A - LNG-based gas turbine-supercritical CO2ORC cycle parallel power generation system - Google Patents

LNG-based gas turbine-supercritical CO2ORC cycle parallel power generation system Download PDF

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CN110685757A
CN110685757A CN201910959976.4A CN201910959976A CN110685757A CN 110685757 A CN110685757 A CN 110685757A CN 201910959976 A CN201910959976 A CN 201910959976A CN 110685757 A CN110685757 A CN 110685757A
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outlet
lng
inlet
orc
power generation
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苏文
彭艳楠
张瑞原
周乃君
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Central South University
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Central South University
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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
    • F01K7/00—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating
    • F01K7/32—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines using steam of critical or overcritical pressure
    • 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
    • F01K13/00—General layout or general methods of operation of complete plants
    • 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
    • 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
    • F01K25/00—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for
    • F01K25/08—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for using special vapours
    • F01K25/10—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for using special vapours the vapours being cold, e.g. ammonia, carbon dioxide, ether
    • F01K25/103—Carbon dioxide
    • 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
    • F01K27/00—Plants for converting heat or fluid energy into mechanical energy, not otherwise provided for
    • 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
    • F01K7/00—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating
    • F01K7/02—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being of multiple-expansion type
    • 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
    • F02C6/00—Plural gas-turbine plants; Combinations of gas-turbine plants with other apparatus; Adaptations of gas-turbine plants for special use
    • F02C6/18—Plural gas-turbine plants; Combinations of gas-turbine plants with other apparatus; Adaptations of gas-turbine plants for special use using the waste heat of gas-turbine plants outside the plants themselves, e.g. gas-turbine power heat plants

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Carbon And Carbon Compounds (AREA)
  • Engine Equipment That Uses Special Cycles (AREA)

Abstract

The invention discloses a gas turbine-supercritical CO based on LNG2ORC cycle parallel power generation system comprising a gas turbine power generation system with LNG, supercritical CO2A cyclic power generation system and an ORC cyclic power generation system. In the invention, LNG is sequentially circulated with ORC and supercritical CO2Circularly and fully exchange heat and mix with airCO-combustion, working through gas turbine system, and sequentially supercritical CO2The cycle and the ORC cycle provide a flue gas heat source. Supercritical CO2And the circulation and the ORC circulation respectively use LNG as cold sources, so that the circulation temperature difference is increased, and the circulation system efficiency is improved. The circulating parallel power generation system takes the high-temperature and high-pressure product formed by burning natural gas as the heat source of the circulating parallel system and takes the LNG cold energy as the cold source of the circulating parallel system, thereby realizing the temperature-to-mouth and energy cascade utilization in the LNG consumption process.

Description

LNG-based gas turbine-supercritical CO2ORC cycle parallel power generation system
Technical Field
The invention relates to an application of LNG in the technical field of power generation, in particular to a gas turbine-supercritical CO based on LNG2-ORC cycle parallel power generation system.
Background
Energy and environmental problems have become two major difficulties restricting the development of human society. With the increasing shortage of traditional energy sources such as coal and petroleum along with the aggravation of environmental pollution, cleaner natural gas (hydrocarbon mixture) becomes a key development object in the strategic action of energy sources in China, so how to efficiently utilize the natural gas is a key ring for improving the energy source structure and guaranteeing the energy source requirements in China. For convenience of storage and long-distance transportation, natural gas is usually cryogenically cooled to a liquid state at-162 ℃, i.e. LNG (liquefied natural gas). Currently, LNG is transported to coastal LNG receiving stations around the world by LNG ships, and is gasified for use in urban civil gas and gas power plants. However, LNG releases a large amount of cold energy during gasification, about 850KJ of energy per kg of LNG. Conventional LNG receiving stations typically employ seawater, air or even combustion to vaporize LNG, which causes a great deal of cold pollution to the environment and wastes a great deal of valuable cold energy.
In the LNG consumption process, the power generation technology of LNG mainly includes: direct expansion, organic rankine cycle, and combined cycle.
The direct expansion method is characterized in that LNG is pressurized through a pump, then is heated through seawater or air, the pressure energy of the LNG directly drives a turbine to do expansion work, the LNG serves as a cold source, the environment serves as a heat source, and proper working media are selected to form a low-temperature Rankine cycle. For low-temperature Rankine cycle, the evaporation process of the working medium can be better matched with the gasification process of LNG, and the heat transfer loss can be effectively reduced. At present, the cycle is widely used, the technology is mature, and the cycle can be combined with a direct expansion method to form a composite cycle, so that the utilization rate of LNG is further improved.
After LNG is gasified into natural gas, the natural gas can be mixed with air for combustion, and the combustion products with high temperature and high pressure expand in a gas turbine to do work. In order to fully utilize the flue gas waste heat (600 ℃) at the outlet of the gas turbine, the flue gas waste heat is generally used as a heat source of a steam Rankine cycle. Although a combined power generation system based on a natural gas turbine-steam rankine cycle is very mature, the system cannot effectively utilize the cold energy of LNG due to the physical property limitation of water.
In order to further improve the power generation efficiency based on the LNG, chinese patent CN106837441B "a gas turbine-nitrogen brayton cycle combined power generation system using LNG cold energy" proposes to use LNG to respectively cool the working mediums at the inlets of the gas turbine and the nitrogen compressor, thereby improving the cycle temperature ratio. In addition, patent CN105257426A "A method of Using S-CO2Ship diesel engine tail gas waste heat power generation system with ORC combined cycle uses tail gas waste heat as supercritical CO2The heat source of circulation and ORC circulation can comprehensively recover the waste heat of the ship main engine, and the heat efficiency of the diesel engine is obviously improved.
In order to comprehensively utilize LNG cold energy power generation and natural gas combustion power generation and realize the aim of temperature opposite and energy gradient utilization, the invention uses the circulating supercritical CO of the gas turbine in different temperature ranges2Circulation and ORC circulation coupling, a combined power generation system based on LNG cold energy and natural gas combustion heat extraction is provided, and the power generation efficiency of the whole thermodynamic system is improved.
Disclosure of Invention
The invention aims to provide an LNG-based gas turbine-supercritical CO capable of comprehensively utilizing LNG cold energy and natural gas combustion heat energy2ORC circulation parallel power generation system, achieve the goal of further improving the power generation efficiency of the whole thermodynamic system.
The LNG-based gas turbine-supercritical CO of the present invention2ORC cycleA parallel power generation system comprising LNG gas turbine power generation system and supercritical CO2A cycle power generation system and an ORC cycle power generation system,
wherein: the LNG gas turbine power generation system comprises an air compressor (1), a compressed air outlet of the air compressor (1) is connected with an air inlet of a combustion chamber (2), and a fuel inlet of the combustion chamber (2) is connected with an outlet of a natural gas turbine (5); an outlet of the LNG storage tank (17) is connected with an inlet of an LNG pump (16), an outlet of the LNG pump (16) is connected with a natural gas inlet of an ORC working medium-LNG heat exchanger (14), and a natural gas outlet of the ORC working medium-LNG heat exchanger (14) is connected with S-CO2The natural gas inlet of the cooler (10) is connected, S-CO2The natural gas outlet of the cooler (10) is connected with the inlet of the natural gas turbine (5); the flue gas outlet of the combustion chamber (2) is connected with the inlet of the combustion turbine (3), the outlet of the combustion turbine (3) is connected with S-CO2The flue gas inlet of the heater (7) is connected; S-CO2The flue gas outlet of the heater (7) is connected with the flue gas inlet of the ORC working medium-flue gas evaporator (18);
the supercritical CO2The circulating power generation system comprises S-CO2Heater (7), S-CO2CO of heater (7)2Outlet S-CO2The inlet of the expander (8) is connected; S-CO2Outlet of expander (8) and S-CO2CO of cooler (10)2Inlet connected, S-CO2CO of cooler (10)2Outlet and S-CO2Compressor (11) inlet, S-CO2Compressor (11) outlet and S-CO2Heater (7) CO2The inlets are connected;
the ORC cycle power generation system comprises an ORC working medium-LNG heat exchanger (14), wherein a liquid working medium outlet of the ORC working medium-LNG heat exchanger (14) is connected with an inlet of an ORC working medium pump (15), an outlet of the ORC working medium pump (15) is connected with a liquid working medium inlet of an ORC working medium-flue gas evaporator (18), a gas working medium outlet of the ORC working medium-flue gas evaporator (18) is connected with an inlet of an ORC expansion machine (12), and an outlet of the ORC expansion machine (12) is connected with a gas working medium inlet of the ORC working medium-LNG heat exchanger (14);
the combustion turbine (3) is connected with the first generator (4), and the natural gas turbine (5) is connected with the second generator (6); S-CO2The expander (8) is connected to a third generator (9) and the ORC expander (12) is connected to a fourth generator (13).
The LNG gas turbine power generation system respectively passes through S-CO2A cooler (10), an ORC working medium-LNG heat exchanger (14) and supercritical CO2The cold source side of the circulation and ORC circulation is connected, and the flue gas outlet of the gas turbine (3) is connected with S-CO2The flue gas inlet of the heater (7) is connected with S-CO2The flue gas outlet of the heater (7) is connected with the flue gas inlet of the ORC working medium-flue gas evaporator (18).
The supercritical CO2The cycle power generation system also comprises a high-temperature regenerator (19), a low-temperature regenerator (20), and S-CO2A recompressor (21); the S-CO2The outlet of the expander (8) is connected with the inlet of the high-temperature end of the high-temperature regenerator (19), the outlet of the low-temperature end of the high-temperature regenerator (19) is connected with the inlet of the high-temperature end of the low-temperature regenerator (20), and CO is introduced into the high-temperature end of the low-temperature regenerator2The gas is divided into two parts through the outlet of the low-temperature end of the low-temperature heat regenerator (20), and the two parts are respectively connected with S-CO2Cooler (10) and S-CO2CO of the recompressor (21)2Inlet connection, S-CO2CO of cooler (10)2Outlet and S-CO2Inlet of the compressor (11) is connected, S-CO2The outlet of the compressor (11) is connected with the inlet of the low-temperature end of the low-temperature heat regenerator (20); low temperature regenerator (20) high temperature end outlet and S-CO2The outlets of the recompressor (21) are connected with the inlet of the low-temperature end of the high-temperature heat regenerator (19), and the outlet of the high-temperature end of the high-temperature heat regenerator (19) is connected with the S-CO2CO of heater (7)2The inlets are connected.
Still further, supercritical CO2The circulating power generation system also comprises S-CO2Reheater (22), second stage S-CO2An expander (23), and a fifth generator (24).
The supercritical CO2In the circulation power generation system: S-CO2CO of heater (7)2Outlet and S-CO2The inlet of the expander (8) is connected with S-CO2Outlet of expander (8) and S-CO2CO of reheater (22)2Inlet connected, S-CO2CO of reheater (22)2Outlet and second stage S-CO2The inlet of the expander (23) is connected with the second stageS-CO2The outlet of the expander (23) is connected with the inlet of the high-temperature end of the high-temperature regenerator (19), and the high-temperature regenerator (19), the low-temperature regenerator (20) and the S-CO are connected2Recompressor (21), S-CO2Cooler (10) and S-CO2The connection relation of the compressor (11) is unchanged; S-CO2Flue gas outlet of heater (7) and S-CO2The flue gas inlet of the reheater (22) is connected with S-CO2The flue gas outlet of the reheater (22) is connected with the flue gas inlet of the ORC working medium-flue gas evaporator (18).
The second stage of S-CO2The expander (23) is connected to a fifth generator (24).
And all the devices of the combined power generation system are connected through pipelines.
The supercritical CO2In the cycle, S-CO2Expander (8), second stage S-CO2Expander (23), S-CO2Compressor (11) and S-CO2The recompressor (21) can be selected to be coaxial or non-coaxial according to the specific spatial layout of the system.
The invention has the beneficial effects that: 1) after LNG fuel gas is combusted and generated, the heat energy of the flue gas is further utilized, and supercritical CO is adopted2The cycle and ORC cycle power generation systems convert it into electrical energy, thereby increasing its power generation efficiency. 2) The LNG gas turbine system of the invention passes through an S-CO2 cooler (10), an ORC working fluid-LNG heat exchanger (14) and a supercritical CO respectively2Circulating, ORC circulating, side-coupled cold source, supercritical CO2The circulation and the ORC circulation fully absorb LNG cold energy, and the flue gas discharged by the gas turbine is used as a heat source, so that the circulation temperature difference is increased, and the system efficiency is improved. 3) The circulating power generation system takes the high-temperature and high-pressure product formed by burning natural gas as the heat source of the circulating parallel system, and takes the LNG cold energy as the cold source of the circulating parallel system, thereby realizing the temperature-to-mouth and energy cascade utilization in the LNG consumption process. 4) The invention adopts supercritical CO2Circulation system in near critical zone (E;)>The compression at 31 ℃) reduces the compression power consumption, can efficiently utilize the waste heat of the flue gas for power generation, adopts low-temperature natural gas as a circulating cold source, saves water resources relative to a steam turbine power generation system, and greatly reduces the whole ruler of a combined systemCun. 5) Supercritical CO used2The circulating system has various system forms, such as a regenerative type, a reheating type and a recompression type, the system is flexible in arrangement, and the power generation efficiency of the system can be further improved.
Drawings
FIG. 1 gas turbine-supercritical CO of LNG in example 12-ORC cycle parallel power generation system connection schematic;
FIG. 2 gas turbine-supercritical CO of LNG in example 22-ORC cycle parallel power generation system connection schematic;
FIG. 3 gas turbine-supercritical CO of LNG in example 32-ORC cycle parallel power generation system connection schematic;
in the figure, 1-air compressor, 2-combustor, 3-gas turbine, 4-first generator, 5-LNG turbine, 6-second generator, 7-S-CO2Heater, 8-S-CO2Expander, 9-third generator, 10-S-CO2Cooler, 11-S-CO2The system comprises a compressor, a 12-ORC expander, a 13-fourth generator, a 14-ORC working medium-LNG heat exchanger, a 15-ORC working medium pump, a 16-LNG pump, a 17-LNG storage tank, an 18-ORC working medium-flue gas evaporator, a 19-high temperature heat regenerator, a 20-low temperature heat regenerator and a 21-S-CO2Recompressor, 22-S-CO2Reheater, 23-second stage S-CO2Expander, 24-fifth generator
Detailed Description
Other advantages and effects of the present invention will be readily apparent to those skilled in the art from the description herein, which follows, in conjunction with the three cyclic parallel configurations listed in the accompanying drawings.
Supercritical CO in all examples2In the cycle, S-CO2Expander (8), second stage S-CO2Expander (23), S-CO2Compressor (11) and S-CO2The recompressor (21) can be selected to be coaxial or non-coaxial according to the specific spatial layout of the system.
Example 1
The gas turbine power generation system: air enters the combustion chamber 2 through the air compressor 1, and meanwhile, natural gas is pressurized from the LNG storage tank 17 through the LNG pump 16 and then sequentially enters the combustion chamberBy means of an ORC working fluid-LNG heat exchanger 14 and S-CO2The cooler 10 is used for evaporation and gasification, the gasified natural gas expands in the natural gas turbine 5 to do work and drives the second generator 6 to generate electricity, the natural gas at the outlet of the natural gas turbine 5 is directly sent into the combustion chamber 2 to be mixed with air and combusted, the high-temperature and high-pressure gas at the outlet of the combustion chamber 2 expands in the gas turbine 3 to do work and drives the first generator 4 to generate electricity, and the flue gas at about 600 ℃ discharged by the gas turbine 3 enters S-CO2A flue gas inlet of the heater 7 is used for leading flue gas to pass through S-CO2Heater 7 pair supercritical CO2Circulating power generation system CO2The medium is heated. S-CO2The flue gas inlet of the heater 7 is connected with the flue gas inlet of the ORC working medium-flue gas evaporator 18.
The supercritical CO2A circulating power generation system: CO22By S-CO2A heater 7 for absorbing heat of the high-temperature flue gas and carrying out S-CO heat treatment2The expander 8 works and drives the third generator 9 to generate electricity, and then S-CO2CO from expander 82Through S-CO2Cooler 10 in S-CO2The cooler 10 absorbs the LNG cold energy (the cold energy is generated by natural gas evaporation and gasification in the gas turbine power generation system), and cools the LNG cold energy to a low-temperature low-pressure state (31 ℃ to 7.31MPa), namely a low-temperature low-pressure state of CO2Into S-CO2After being compressed by the compressor 11, the compressed gas enters S-CO2CO of heater 72And (4) entering to complete a cycle process.
The ORC cycle power generation system: the ORC working medium-LNG heat exchanger 14 absorbs cold energy of LNG (the cold energy is generated by natural gas evaporation and gasification in a gas turbine power generation system), so that the LNG can be condensed into a low-temperature liquid working medium in a pipeline, the low-temperature liquid working medium enters a working medium pump 15 for pressurization, the working medium enters an ORC working medium-flue gas evaporator 18 from an outlet of the working medium pump 15 to absorb S-CO2And the waste heat of the flue gas at the outlet of the heater 7 is gasified to finish phase change, the flue gas enters the ORC-expansion machine 12 to do work and drive the fourth generator 13 to generate power, and the gas working medium enters the ORC working medium-LNG heat exchanger 14 to absorb the cold energy of the LNG and enters the next cycle.
Example 2
The gas turbine power generation system: air enters the combustion chamber 2 through the air compressor 1,meanwhile, after being pressurized by the LNG pump 16 from the LNG storage tank 17, the natural gas passes through the ORC working medium-LNG heat exchanger 14 and the S-CO in sequence2The cooler 10 is used for evaporation and gasification, the gasified natural gas expands in the natural gas turbine 5 to do work and drives the second generator 6 to generate electricity, the natural gas at the outlet of the natural gas turbine 5 is directly sent into the combustion chamber 2 to be mixed with air and combusted, the high-temperature and high-pressure gas at the outlet of the combustion chamber 2 expands in the gas turbine 3 to do work and drives the first generator 4 to generate electricity, and the flue gas at about 600 ℃ discharged by the gas turbine 3 enters S-CO2A flue gas inlet of the heater 7 is used for leading flue gas to pass through S-CO2Heater 7 pair supercritical CO2Circulating power generation system CO2The medium is heated. S-CO2The flue gas inlet of the heater 7 is connected with the flue gas inlet of the ORC working medium-flue gas evaporator 18.
The supercritical CO2A circulating power generation system: S-CO2By S-CO2The heater 7 absorbs the heat of the high-temperature flue gas and carries out S-CO heat treatment2The expander 8 works and drives the third generator 9 to generate electricity, and then S-CO2High temperature low pressure CO from expander 82Enters the high-temperature end inlet of the high-temperature regenerator 19 and then enters the high-temperature end inlet of the low-temperature regenerator 20 from the low-temperature outlet of the high-temperature regenerator 19, and CO2After coming out of the low-temperature end outlet of the low-temperature regenerator 20, the low-temperature heat exchange liquid is divided into two parts, and one part enters S-CO2The S-CO enters the cooler 102 Compressor 11 to low temperature high pressure CO2High temperature and low pressure CO entering the low temperature end of the low temperature regenerator 20 and entering the high temperature end of the low temperature regenerator 202Carrying out heat exchange; the other part is subjected to S-CO2The recompressor 21 forms high-pressure CO2With a first portion of the CO exiting the high temperature side outlet of low temperature regenerator 202The mixed gas enters the inlet of the low temperature end of the high temperature heat regenerator 19, and the high temperature and low pressure CO enters the high temperature end of the high temperature heat regenerator 192After heat exchange, S-CO flows in2CO of heater 72And (4) entering to complete one cycle. Due to supercritical CO2High temperature S-CO at expander outlet in cycle2The cooling heat rejection is large, so the embodiment adopts the high-low temperature heat regenerator to efficiently recover heat in the cycle to further improve the supercritical CO2The efficiency of the cycle. The high-temperature regenerator 19 and the low-temperature regenerator 20 have two pairs of inlets and outlets, S-CO2The high-temperature and low-pressure CO comes out of the expander 82S-CO2Compressor 11 and S-CO2From the recompressor 21 is high-pressure CO2High temperature and low pressure CO in the circulation process2With high pressure CO2Heat exchange occurs between high temperature regenerator 19 and low temperature regenerator 20.
The ORC cycle power generation system: the ORC working medium-LNG heat exchanger 14 absorbs cold energy of LNG (the cold energy is generated by natural gas evaporation and gasification in a gas turbine power generation system), so that the LNG can be condensed into a low-temperature liquid working medium in a pipeline, the low-temperature liquid working medium enters a working medium pump 15 for pressurization, the working medium enters an ORC working medium-flue gas evaporator 18 from an outlet of the working medium pump 15 to absorb S-CO2And the waste heat of the flue gas at the outlet of the heater 7 is gasified to finish phase change, the flue gas enters the ORC-expansion machine 12 to do work and drive the fourth generator 13 to generate power, and the gas working medium enters the ORC working medium-LNG heat exchanger 14 to absorb the cold energy of the LNG and enters the next cycle.
Example 3
The gas turbine power generation system: air enters a combustion chamber 2 through an air compressor 1, and meanwhile, natural gas is pressurized from an LNG storage tank 17 through an LNG pump 16 and then sequentially passes through an ORC working medium-LNG heat exchanger 14 and an S-CO heat exchanger2The cooler 10 is used for evaporation and gasification, the gasified natural gas expands in the natural gas turbine 5 to do work and drives the second generator 6 to generate electricity, the natural gas at the outlet of the natural gas turbine 5 is directly sent into the combustion chamber 2 to be mixed with air and combusted, the high-temperature and high-pressure gas at the outlet of the combustion chamber 2 expands in the gas turbine 3 to do work and drives the first generator 4 to generate electricity, and the flue gas at about 600 ℃ discharged by the gas turbine 3 enters S-CO2 Heater 7 flue gas inlet, S-CO2Heater 7 flue gas inlet and outlet S-CO2The reheater 22 is connected to the flue gas inlet, and the flue gas passes through S-CO first and then2Heater 7 and S-CO2Reheater 22 for supercritical CO2Circulating power generation system CO2The medium is heated. S-CO2The flue gas outlet of the reheater 22 is connected to the flue gas inlet of the ORC working fluid-flue gas evaporator 18.
The supercritical CO2A circulating power generation system: CO22By S-CO2The heater 7 absorbs the heat of the high-temperature flue gas and then enters S-CO2The expander 8 does work and drives the third generator 9 to generate electricity, and then S-CO2CO from expander 82Into S-CO2Reheater 22CO2The inlet is used for further absorbing the waste heat of the high-temperature flue gas and then entering the second stage of S-CO2The expander 23, the expander 23 does work and drives the third generator 24 to generate electricity, and the second stage S-CO is connected with the second stage S-CO2High temperature low pressure CO from expander 232Enters the high-temperature end inlet of the high-temperature regenerator 19 and then enters the high-temperature end inlet of the low-temperature regenerator 20 from the low-temperature outlet of the high-temperature regenerator 19, and CO2After coming out of the low-temperature end outlet of the low-temperature regenerator 20, the low-temperature heat exchange liquid is divided into two parts, and one part enters S-CO2The S-CO enters the cooler 102The compressor 11 becomes low-temperature high-pressure S-CO2High-temperature low-pressure CO entering the low-temperature end inlet of the low-temperature regenerator 20 and entering the low-temperature regenerator 20 and the high-temperature end inlet2Carrying out heat exchange; the other part is subjected to S-CO2The recompressor 21 forms high-pressure CO2With the first portion of CO exiting the high temperature end of low temperature regenerator 202The mixed gas enters the inlet at the low temperature end of the high temperature heat regenerator 19, and the high temperature and low pressure CO enters the high temperature heat regenerator 19 and the inlet at the high temperature end2After heat exchange, S-CO flows in2CO of heater 72And (4) entering to complete one cycle. In the embodiment, the supercritical CO is adopted2Arrangement of S-CO in the circulation2Reheater 22 and second stage S-CO2The expander 23 can further improve the thermal efficiency of the cycle.
The ORC cycle power generation system: the ORC working medium-LNG heat exchanger 14 absorbs cold energy of LNG (the cold energy is generated by natural gas evaporation and gasification in a gas turbine power generation system), so that the LNG can be condensed into a low-temperature liquid working medium in a pipeline, the low-temperature liquid working medium enters a working medium pump 15 for pressurization, the working medium enters an ORC working medium-flue gas evaporator 18 from an outlet of the working medium pump 15 to absorb S-CO2And the waste heat of the flue gas at the outlet of the reheater 22 is gasified to complete phase change, the flue gas enters the ORC-expander 12 to do work and drive the fourth generator 13 to generate power, and the gas working medium enters the ORC working medium-LNG heat exchanger 14 to absorb the cold energy of the LNG and enters the next cycle.

Claims (7)

1. LNG-based gas turbine-supercritical CO2-ORC cycle parallel power generation system, characterized in that it comprises a gas turbine power generation system with LNG, supercritical CO2A cycle power generation system and an ORC cycle power generation system,
wherein: the LNG gas turbine power generation system comprises an air compressor (1), a compressed air outlet of the air compressor (1) is connected with an air inlet of a combustion chamber (2), and a fuel inlet of the combustion chamber (2) is connected with an outlet of a natural gas turbine (5); an outlet of the LNG storage tank (17) is connected with an inlet of an LNG pump (16), an outlet of the LNG pump (16) is connected with a natural gas inlet of an ORC working medium-LNG heat exchanger (14), and a natural gas outlet of the ORC working medium-LNG heat exchanger (14) is connected with S-CO2The natural gas inlet of the cooler (10) is connected, S-CO2The natural gas outlet of the cooler (10) is connected with the inlet of the natural gas turbine (5); the flue gas outlet of the combustion chamber (2) is connected with the inlet of the combustion turbine (3), the outlet of the combustion turbine (3) is connected with S-CO2The flue gas inlet of the heater (7) is connected; S-CO2The flue gas outlet of the heater (7) is connected with the flue gas inlet of the ORC working medium-flue gas evaporator (18);
the supercritical CO2The circulating power generation system comprises S-CO2Heater (7), S-CO2CO of heater (7)2Outlet S-CO2The inlet of the expander (8) is connected; S-CO2Outlet of expander (8) and S-CO2CO of cooler (10)2Inlet connected, S-CO2CO of cooler (10)2Outlet and S-CO2Compressor (11) inlet, S-CO2Compressor (11) outlet and S-CO2Heater (7) CO2The inlets are connected;
the ORC cycle power generation system comprises an ORC working medium-LNG heat exchanger (14), wherein a liquid working medium outlet of the ORC working medium-LNG heat exchanger (14) is connected with an inlet of an ORC working medium pump (15), an outlet of the ORC working medium pump (15) is connected with a liquid working medium inlet of an ORC working medium-flue gas evaporator (18), a gas working medium outlet of the ORC working medium-flue gas evaporator (18) is connected with an inlet of an ORC expansion machine (12), and an outlet of the ORC expansion machine (12) is connected with a gas working medium inlet of the ORC working medium-LNG heat exchanger (14);
the combustion turbine (3) is connected with the first generator (4), and the natural gas turbine (5) is connected with the second generator (6); S-CO2The expander (8) is connected to a third generator (9) and the ORC expander (12) is connected to a fourth generator (13).
2. LNG-based gas turbine-supercritical CO according to claim 12-ORC cycle parallel power generation system, characterized in that said LNG gas turbine power generation system is operated by S-CO respectively2A cooler (10), an ORC working medium-LNG heat exchanger (14) and supercritical CO2The cold source side of the circulation and ORC circulation is connected, and the flue gas outlet of the gas turbine (3) is connected with S-CO2The flue gas inlet of the heater (7) is connected with S-CO2The flue gas outlet of the heater (7) is connected with the flue gas inlet of the ORC working medium-flue gas evaporator (18).
3. LNG-based gas turbine-supercritical CO according to claim 12-ORC cycle parallel power generation system, characterized in that said supercritical CO2The cycle power generation system also comprises a high-temperature regenerator (19), a low-temperature regenerator (20), and S-CO2A recompressor (21); the S-CO2The outlet of the expander (8) is connected with the inlet of the high-temperature end of the high-temperature regenerator (19), the outlet of the low-temperature end of the high-temperature regenerator (19) is connected with the inlet of the high-temperature end of the low-temperature regenerator (20), and CO is introduced into the high-temperature end of the low-temperature regenerator2The gas is divided into two parts through the outlet of the low-temperature end of the low-temperature heat regenerator (20), and the two parts are respectively connected with S-CO2Cooler (10) and S-CO2CO of the recompressor (21)2Inlet connection, S-CO2CO of cooler (10)2Outlet and S-CO2Inlet of the compressor (11) is connected, S-CO2The outlet of the compressor (11) is connected with the inlet of the low-temperature end of the low-temperature heat regenerator (20); low temperature regenerator (20) high temperature end outlet and S-CO2The outlets of the recompressor (21) are connected with the inlet of the low-temperature end of the high-temperature heat regenerator (19), and the outlet of the high-temperature end of the high-temperature heat regenerator (19) is connected with the S-CO2CO of heater (7)2The inlets are connected.
4. According toLNG-based gas turbine-supercritical CO according to claim 32ORC cycle parallel power generation system, characterized by supercritical CO2The circulating power generation system also comprises S-CO2Reheater (22), second stage S-CO2An expander (23), and a fifth generator (24).
5. LNG-based gas turbine-supercritical CO according to claim 42-ORC cycle parallel power generation system, characterized in that said supercritical CO2In the circulation power generation system: S-CO2CO of heater (7)2Outlet and S-CO2The inlet of the expander (8) is connected with S-CO2Outlet of expander (8) and S-CO2CO of reheater (22)2Inlet connected, S-CO2CO of reheater (22)2Outlet and second stage S-CO2The inlet of the expander (23) is connected with the second stage S-CO2The outlet of the expander (23) is connected with the inlet of the high-temperature end of the high-temperature regenerator (19), and the high-temperature regenerator (19), the low-temperature regenerator (20) and the S-CO are connected2Recompressor (21), S-CO2Cooler (10) and S-CO2The connection relation of the compressor (11) is unchanged; S-CO2Flue gas outlet of heater (7) and S-CO2The flue gas inlet of the reheater (22) is connected with S-CO2The flue gas outlet of the reheater (22) is connected with the flue gas inlet of the ORC working medium-flue gas evaporator (18).
6. LNG-based gas turbine-supercritical CO according to claim 52-ORC cycle parallel power generation system, characterized in that said second stage S-CO2The expander (23) is connected to a fifth generator (24).
7. LNG-based gas turbine-supercritical CO according to any of claims 1 to 62-ORC cycle parallel power generation system, characterized in that the devices of said parallel power generation system are connected by pipes.
CN201910959976.4A 2019-10-10 2019-10-10 LNG-based gas turbine-supercritical CO2ORC cycle parallel power generation system Pending CN110685757A (en)

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