CN112648034B - BOG gas turbine, supercritical CO2 Brayton and organic Rankine combined cycle power generation system utilizing LNG cold energy - Google Patents
BOG gas turbine, supercritical CO2 Brayton and organic Rankine combined cycle power generation system utilizing LNG cold energy Download PDFInfo
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- 238000010248 power generation Methods 0.000 title claims abstract description 22
- 239000007789 gas Substances 0.000 claims abstract description 45
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- 239000003345 natural gas Substances 0.000 claims abstract description 10
- OFBQJSOFQDEBGM-UHFFFAOYSA-N Pentane Chemical compound CCCCC OFBQJSOFQDEBGM-UHFFFAOYSA-N 0.000 claims description 6
- BKIMMITUMNQMOS-UHFFFAOYSA-N nonane Chemical compound CCCCCCCCC BKIMMITUMNQMOS-UHFFFAOYSA-N 0.000 claims description 6
- TVMXDCGIABBOFY-UHFFFAOYSA-N octane Chemical compound CCCCCCCC TVMXDCGIABBOFY-UHFFFAOYSA-N 0.000 claims description 6
- MSSNHSVIGIHOJA-UHFFFAOYSA-N pentafluoropropane Chemical compound FC(F)CC(F)(F)F MSSNHSVIGIHOJA-UHFFFAOYSA-N 0.000 claims description 6
- 239000012071 phase Substances 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 5
- 239000007791 liquid phase Substances 0.000 claims description 3
- -1 R365 mfcfluorobutane Chemical compound 0.000 claims 1
- 239000012530 fluid Substances 0.000 claims 1
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- 238000010521 absorption reaction Methods 0.000 abstract description 3
- 230000000295 complement effect Effects 0.000 abstract description 3
- 238000004134 energy conservation Methods 0.000 abstract description 3
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- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 abstract description 2
- 238000001816 cooling Methods 0.000 abstract description 2
- 239000003546 flue gas Substances 0.000 abstract description 2
- 239000000446 fuel Substances 0.000 abstract description 2
- 239000000203 mixture Substances 0.000 description 3
- NVSXSBBVEDNGPY-UHFFFAOYSA-N 1,1,1,2,2-pentafluorobutane Chemical compound CCC(F)(F)C(F)(F)F NVSXSBBVEDNGPY-UHFFFAOYSA-N 0.000 description 2
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- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
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- 238000012986 modification Methods 0.000 description 1
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- 238000011064 split stream procedure Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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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
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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
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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
- 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
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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
- 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
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- 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
- F02C3/00—Gas-turbine plants characterised by the use of combustion products as the working fluid
- F02C3/20—Gas-turbine plants characterised by the use of combustion products as the working fluid using a special fuel, oxidant, or dilution fluid to generate the combustion products
- F02C3/22—Gas-turbine plants characterised by the use of combustion products as the working fluid using a special fuel, oxidant, or dilution fluid to generate the combustion products the fuel or oxidant being gaseous at standard temperature and pressure
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- 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
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- 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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- 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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- Chemical & Material Sciences (AREA)
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- Chemical Kinetics & Catalysis (AREA)
- Engine Equipment That Uses Special Cycles (AREA)
Abstract
A BOG gas turbine, supercritical CO2 Brayton and organic Rankine combined cycle power generation system utilizing LNG cold energy comprises a BOG gas turbine system and supercritical CO2Recompression Brayton cycle, organic Rankine cycle and natural gas direct expansion system; BOG is used for cooling organic Rankine cycle working medium and then used as fuel of a gas turbine system, and flue gas at the outlet of the gas turbine is used as supercritical CO2The heat source of Brayton cycle is compressed again, so that the BOG is efficiently recycled; using LNG as organic Rankine cycle and supercritical CO2Then the cold source of the Brayton cycle is compressed, and the LNG after heat absorption and gasification is used for direct expansion power generation, so that the cascade utilization of the LNG cold energy is realized; the invention can realize the high-efficiency complementary utilization of the BOG and the LNG cold energy, and obviously improves the heat efficiency and the power generation efficiency of the power generation system; has the advantages of reasonable structure, low cost, energy conservation, high efficiency and strong practicability.
Description
Technical Field
The invention relates to a technology for coupling and utilizing LNG (liquefied natural gas) cold energy and BOG (boil off gas), in particular to a BOG gas turbine, supercritical CO2 Brayton and organic Rankine combined cycle power generation system utilizing LNG cold energy.
Background
Cryogenic tanks of Liquefied Natural Gas (LNG) cannot achieve absolute thermal insulation and therefore inevitably produce Boil Off Gas (BOG). The presence of BOG threatens the production safety of the system and must be properly handled. However, the existing BOG processing system has the problems of complex structure, high energy consumption, serious cold energy waste and the like.
LNG needs to be gasified to normal temperature and then supplied to users. LNG can release a large amount of cold energy during the gasification process, if at allThe cold energy can be utilized, and great economic benefits can be generated. Supercritical CO2The recompression Brayton cycle has the advantages of compact structure, high thermal efficiency, safety, environmental protection and the like. The organic Rankine cycle using low-boiling-point hydrocarbons and the mixture thereof as the working medium has a plurality of advantages in the aspect of utilizing low-grade heat energy, and LNG is used as supercritical CO2The power generation efficiency can be further improved by recompressing cold sources of the Brayton cycle and the organic Rankine cycle, but the utilization rate of LNG cold energy is not high. The natural gas direct expansion power generation technology has the advantages of simple process, low cost and the like, but can only utilize the pressure energy of LNG and has the defect of low utilization rate of cold energy.
Disclosure of Invention
In order to solve the defects of the prior art, the invention aims to provide a BOG gas turbine and a supercritical CO2 Brayton organic Rankine combined cycle power generation system utilizing LNG cold energy, wherein the BOG gas turbine and the supercritical CO are used2The recompression Brayton cycle, the organic Rankine cycle and the natural gas direct expansion system are combined, so that the high-efficiency complementary utilization of the BOG and the LNG cold energy can be realized, and the heat efficiency and the power generation efficiency of the system are obviously improved; has the advantages of reasonable structure, low cost, energy conservation, high efficiency and strong practicability.
In order to achieve the purpose, the invention adopts the following technical scheme:
a BOG gas turbine, supercritical CO2 Brayton and organic Rankine combined cycle power generation system utilizing LNG cold energy comprises a BOG gas turbine system and supercritical CO2Recompressing the Brayton cycle, the organic Rankine cycle and the natural gas direct expansion system;
the BOG gas turbine system comprises a BOG compressor 2, wherein an inlet side of the BOG compressor 2 is communicated with a gas-phase outlet side of an LNG storage tank, an outlet side of the BOG compressor 2 is connected to a cold flow inlet side of a first heat exchanger 3, a cold flow outlet side of the first heat exchanger 3 and an outlet side of an air compressor 4 are both connected to an inlet side of a combustor 5, an outlet side of the combustor 5 is connected with an inlet side of a gas turbine 7, an outlet side of the gas turbine 7 is connected to a hot flow inlet side of a second heat exchanger 6, and gas on a hot flow outlet side of the second heat exchanger 6 is discharged outside;
the supercritical CO2The recompression Brayton cycle comprises a main compressor 16, wherein the outlet side of the main compressor 16 is communicated with the cold flow inlet side of a low-temperature heat regenerator 18, the cold flow outlet side of the low-temperature heat regenerator 18 and the outlet side of a recompressor 17 are connected into the cold flow inlet side of a high-temperature heat regenerator 20 through a mixer 19, the cold flow outlet side of the high-temperature heat regenerator 20 is communicated with the cold flow inlet side of a second heat exchanger 6, and the cold flow outlet side of the second heat exchanger 6 is communicated with the supercritical CO2The inlet side of the turboexpander 21 is communicated with supercritical CO2The outlet side of the turboexpander 21 is communicated with the heat flow inlet side of the high-temperature regenerator 20, the heat flow outlet side of the high-temperature regenerator 20 is communicated with the heat flow inlet side of the low-temperature regenerator 18, the heat flow outlet side of the low-temperature regenerator 18 is connected to the heat flow inlet side of the fourth heat exchanger 11, the heat flow outlet side of the fourth heat exchanger 11 is communicated with the inlet side of the three-way valve 13, the outlet side of the three-way valve 13 is divided into two parts, one part is connected to the inlet side of the recompressor 17, the other part is connected to the heat flow inlet side of the precooler 14, and the heat flow outlet side of the precooler 14 is communicated with the inlet side of the main compressor 16;
the organic Rankine cycle comprises an organic Rankine turboexpander 12, wherein the outlet side of the organic Rankine turboexpander 12 is communicated with the heat flow inlet side of a first heat exchanger 3, the heat flow outlet side of the first heat exchanger 3 is connected to the heat flow inlet side of a third heat exchanger 9, the heat flow outlet side of the third heat exchanger 9 is communicated with the inlet side of an organic working medium pump 10, the outlet side of the organic working medium pump 10 is connected to the cold flow inlet side of a fourth heat exchanger 11, and the cold flow outlet side of the fourth heat exchanger 11 is connected to the inlet side of the organic Rankine turboexpander 12;
the natural gas direct expansion system comprises an LNG storage tank 1, wherein a liquid phase outlet side of the LNG storage tank 1 is connected with an inlet side of an LNG pump 8, an outlet side of the LNG pump 8 is connected to a cold flow inlet side of a third heat exchanger 9, a cold flow outlet side of the third heat exchanger 9 is connected with a cold flow inlet side of a precooler 14, and a cold flow outlet side of the precooler 14 is communicated with an inlet side of a turboexpander 15.
The gas phase outlet side of the LNG storage tank 1 is BOG.
The supercritical CO2Recompression of the circulating working medium in the Brayton cycle to supercritical CO2。
The organic working medium in the organic Rankine cycle comprises but is not limited to R245fa pentafluoropropane, R365mfc pentafluorobutane, n-Nonane, n-Octane or n-Pentane.
The outlet side of the turboexpander 15 is directly connected to a customer or a company.
The invention has the beneficial effects that:
BOG is used for cooling organic Rankine cycle working medium and then used as fuel of a gas turbine system, and flue gas at the outlet of the gas turbine is used as supercritical CO2The heat source of Brayton cycle is compressed again, so that the BOG is efficiently recycled; using LNG as organic Rankine cycle and supercritical CO2Then, a cold source of Brayton cycle is compressed, and the LNG after heat absorption and gasification is used for direct expansion power generation, so that the cascade utilization of the LNG cold energy is realized; through the efficient complementary utilization of the BOG and the LNG cold energy, the heat efficiency and the power generation efficiency of the system are effectively improved, and the system has the advantages of reasonable structure, low cost, energy conservation, high efficiency and strong practicability.
Drawings
FIG. 1 is a schematic view of the present invention.
In the figure: 1. an LNG storage tank; 2. a BOG compressor; 3. a first heat exchanger; 4. an air compressor; 5. a burner; 6. a second heat exchanger; 7. a gas turbine; 8. an LNG pump; 9. a third heat exchanger; 10. an organic working medium pump; 11. a fourth heat exchanger; 12. an organic rankine turboexpander; 13. a tee joint device; 14. a precooler; 15. a turbo expander; 16. a main compressor; 17. then compressing the mixture; 18. a low temperature regenerator; 19. a mixer; 20. a high temperature regenerator; 21. supercritical CO2A turboexpander.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Referring to fig. 1, a BOG gas turbine, supercritical CO2 brayton, organic rankine combined cycle power generation system using LNG cold energy includes a BOG gas turbine system, a supercritical CO2Recompression Brayton cycleA ring, organic rankine cycle and natural gas direct expansion system;
the BOG gas turbine system comprises a BOG compressor 2, wherein an inlet side of the BOG compressor 26 is communicated with a gas-phase outlet side of an LNG storage tank, an outlet side of the BOG compressor 2 is connected to a cold flow inlet side of a first heat exchanger 3, a cold flow outlet side of the first heat exchanger 3 and an outlet side of an air compressor 4 are both connected to an inlet side of a combustor 5, an outlet side of the combustor 5 is connected with an inlet side of a gas turbine 7, an outlet side of the gas turbine 7 is connected to a hot flow inlet side of a second heat exchanger 6, and gas on a hot flow outlet side of the second heat exchanger 6 is discharged outside;
the supercritical CO2The recompression Brayton cycle comprises a main compressor 16, wherein the outlet side of the main compressor 16 is communicated with the cold flow inlet side of a low-temperature heat regenerator 18, the cold flow outlet side of the low-temperature heat regenerator 18 and the outlet side of a recompressor 17 are connected into the cold flow inlet side of a high-temperature heat regenerator 20 through a mixer 19, the cold flow outlet side of the high-temperature heat regenerator 20 is communicated with the cold flow inlet side of a second heat exchanger 6, and the cold flow outlet side of the second heat exchanger 6 is communicated with the supercritical CO2The inlet side of the turboexpander 21 is communicated with supercritical CO2The outlet side of the turboexpander 21 is communicated with the hot flow inlet side of the high-temperature heat regenerator 20, the hot flow outlet side of the high-temperature heat regenerator 20 is communicated with the hot flow inlet side of the low-temperature heat regenerator 18, the hot flow outlet side of the low-temperature heat regenerator 18 is connected to the hot flow inlet side of the fourth heat exchanger 11, the hot flow outlet side of the fourth heat exchanger 11 is communicated with the inlet side of the three-way valve 13, the outlet side of the three-way valve 13 is divided into two parts, one part is connected to the inlet side of the recompressor 17, the other part is connected to the hot flow inlet side of the precooler 14, and the hot flow outlet side of the precooler 14 is communicated with the inlet side of the main compressor 16;
the organic Rankine cycle comprises an organic Rankine turboexpander 12, wherein the outlet side of the organic Rankine turboexpander 12 is communicated with the heat flow inlet side of a first heat exchanger 3, the heat flow outlet side of the first heat exchanger 3 is connected to the heat flow inlet side of a third heat exchanger 9, the heat flow outlet side of the third heat exchanger 9 is communicated with the inlet side of an organic working medium pump 10, the outlet side of the organic working medium pump 10 is connected to the cold flow inlet side of a fourth heat exchanger 11, and the cold flow outlet side of the fourth heat exchanger 11 is connected to the inlet side of the organic Rankine turboexpander 12;
the direct natural gas expansion system comprises an LNG storage tank 1, wherein the liquid phase outlet side of the LNG storage tank 1 is connected with the inlet side of an LNG pump 8, the outlet side of the LNG pump 8 is connected to the cold flow inlet side of a third heat exchanger 9, the cold flow outlet side of the third heat exchanger 9 is connected with the cold flow inlet side of a precooler 14, and the cold flow outlet side of the precooler 14 is communicated with the inlet side of a turboexpander 15.
And the gas phase outlet side of the LNG storage tank 1 is BOG.
The supercritical CO2Recompression of the circulating working medium in the Brayton cycle to supercritical CO2。
The organic working medium in the organic Rankine cycle comprises but is not limited to R245fa pentafluoropropane, R365mfc pentafluorobutane, n-Nonane, n-Octane or n-Pentane.
The outlet side of the turboexpander 15 is connected directly to the customer or to the company.
The working principle of the invention is as follows:
boil-off gas (BOG) generated by the LNG storage tank 1 is conveyed to the first heat exchanger 3 through the BOG compressor 2, and after being heated and heated, the boil-off gas and working media at the outlet of the air compressor 4 enter the combustor 5 together for combustion reaction, all products are gas and enter the gas turbine 7 for power generation, and then enter the second heat exchanger 6 for supercritical CO generation2Then compressing the Brayton cycle to provide heat flow to complete the BOG gas turbine system; the LNG in the LNG storage tank 1 is pressurized by an LNG pump 8, secondarily heated by a third heat exchanger 9 and a precooler 14, and then enters a turbine expander 15 to generate power, so that the direct expansion process of the natural gas is completed; the organic working medium is heated by high-temperature CO in the fourth heat exchanger 112Heating, generating power through an organic Rankine turboexpander 12, after the power generation process is finished, enabling an organic working medium to enter a first heat exchanger 3 to be cooled by BOG, and enabling the organic working medium to be cooled by LNG in a third heat exchanger 9 to finish the organic Rankine cycle; high pressure supercritical CO2Exchanging heat with high-temperature gas in a second heat exchanger 6, and performing heat exchange to obtain high-temperature high-pressure supercritical CO2By supercritical CO2The turbo expander 21 does work to generate power, and CO does work2Enters a high-temperature regenerator 20 forConstant pressure heat release to heat CO at low temperature2Then enters a low-temperature regenerator 18 for constant-pressure heat release, and the CO after heat release2Enters a fourth heat exchanger 11 to provide heat flow for the organic Rankine cycle, and then passes through a tee joint 13 to partially supply CO2The split stream is directed to the recompressor 17 for adiabatic compression, the other part of the CO2The CO enters a precooler 14 to exchange heat with LNG and is precooled by the precooler 142The supercritical CO enters a main compressor 16 for pressurization and the pressurized supercritical CO2Enters a low-temperature regenerator 18 for absorbing heat and is in contact with CO discharged by a recompressor 172After mixing, the mixture enters a high-temperature heat regenerator 20 for constant pressure heat absorption, and then exchanges heat with the heated high-temperature gas in a second heat exchanger 6 again to finish the supercritical CO2The Brayton cycle is recompressed.
It should be understood that the above detailed description is only for illustrating the technical solutions of the present invention and is not exhaustive, and although the present invention is described in detail with reference to the above detailed description, a person of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.
Claims (5)
1. A BOG gas turbine, supercritical CO2 Brayton and organic Rankine combined cycle power generation system utilizing LNG cold energy comprises a BOG gas turbine system and supercritical CO2Recompression Brayton cycle, organic Rankine cycle and natural gas direct expansion system; the method is characterized in that:
the BOG gas turbine system comprises a BOG compressor (2), wherein the inlet side of the BOG compressor (2) is communicated with the gas-phase outlet side of an LNG storage tank, the outlet side of the BOG compressor (2) is connected to the cold-flow inlet side of a first heat exchanger (3), the cold-flow outlet side of the first heat exchanger (3) and the outlet side of an air compressor (4) are connected to the inlet side of a combustor (5), the outlet side of the combustor (5) is connected with the inlet side of a gas turbine (7), the outlet side of the gas turbine (7) is connected to the hot-flow inlet side of a second heat exchanger (6), and gas on the hot-flow outlet side of the second heat exchanger (6) is discharged outwards;
the super clinicalBoundary CO2The recompression Brayton cycle comprises a main compressor (16), wherein the outlet side of the main compressor (16) is communicated with the cold flow inlet side of a low-temperature heat regenerator (18), the cold flow outlet side of the low-temperature heat regenerator (18) is connected with the outlet side of a recompressor (17) through a mixer (19) into the cold flow inlet side of a high-temperature heat regenerator (20), the cold flow outlet side of the high-temperature heat regenerator (20) is communicated with the cold flow inlet side of a second heat exchanger (6), and the cold flow outlet side of the second heat exchanger (6) is communicated with the supercritical CO2The inlet side of the turboexpander (21) is communicated with supercritical CO2The outlet side of a turboexpander (21) is communicated with the hot flow inlet side of a high-temperature regenerator (20), the hot flow outlet side of the high-temperature regenerator (20) is communicated with the hot flow inlet side of a low-temperature regenerator (18), the hot flow outlet side of the low-temperature regenerator (18) is connected to the hot flow inlet side of a fourth heat exchanger (11), the hot flow outlet side of the fourth heat exchanger (11) is communicated with the inlet side of a tee joint (13), the outlet side of the tee joint (13) is divided into two parts, one part is connected to the inlet side of a recompressor (17), the other part is connected to the hot flow inlet side of a precooler (14), and the hot flow outlet side of the precooler (14) is communicated with the inlet side of a main compressor (16);
the organic Rankine cycle comprises an organic Rankine turboexpander (12), wherein the outlet side of the organic Rankine turboexpander (12) is communicated with the heat flow inlet side of a first heat exchanger (3), the heat flow outlet side of the first heat exchanger (3) is connected to the heat flow inlet side of a third heat exchanger (9), the heat flow outlet side of the third heat exchanger (9) is communicated with the inlet side of an organic working medium pump (10), the outlet side of the organic working medium pump (10) is connected to the cold flow inlet side of a fourth heat exchanger (11), and the cold flow outlet side of the fourth heat exchanger (11) is connected to the inlet side of the organic Rankine turboexpander (12);
the direct natural gas expansion system comprises an LNG storage tank (1), wherein the liquid phase outlet side of the LNG storage tank (1) is connected with the inlet side of an LNG pump (8), the outlet side of the LNG pump (8) is connected to the cold flow inlet side of a third heat exchanger (9), the cold flow outlet side of the third heat exchanger (9) is connected with the cold flow inlet side of a precooler (14), and the cold flow outlet side of the precooler (14) is communicated with the inlet side of a turboexpander (15).
2. The BOG gas turbine, supercritical CO2 Brayton, organic Rankine combined cycle power generation system using LNG cold energy according to claim 1, wherein: and the working medium on the gas phase outlet side of the LNG storage tank (1) is BOG.
3. The BOG gas turbine, supercritical CO2 Brayton, organic Rankine combined cycle power generation system using LNG cold energy according to claim 1, wherein: the supercritical CO2Recompression of the circulating working medium in the Brayton cycle to supercritical CO2。
4. The BOG gas turbine, supercritical CO2 Brayton, organic Rankine combined cycle power generation system using LNG cold energy according to claim 1, wherein: the organic working fluid includes but is not limited to R245fa pentafluoropropane, R365 mfcfluorobutane, n-Nonane, n-Octane or n-Pentane.
5. The BOG gas turbine, supercritical CO2 Brayton, organic Rankine combined cycle power generation system using LNG cold energy according to claim 1, wherein: the outlet side of the turboexpander (15) is directly connected to a user or a company.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011567411.0A CN112648034B (en) | 2020-12-25 | 2020-12-25 | BOG gas turbine, supercritical CO2 Brayton and organic Rankine combined cycle power generation system utilizing LNG cold energy |
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