CN111120025A - Receiving station LNG cold energy power generation and BOG recovery power generation coupling system and method - Google Patents
Receiving station LNG cold energy power generation and BOG recovery power generation coupling system and method Download PDFInfo
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- 238000010248 power generation Methods 0.000 title claims abstract description 145
- 238000011084 recovery Methods 0.000 title claims abstract description 50
- 238000000034 method Methods 0.000 title claims abstract description 37
- 238000010168 coupling process Methods 0.000 title claims abstract description 28
- 230000008878 coupling Effects 0.000 title claims abstract description 23
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 23
- 239000007789 gas Substances 0.000 claims abstract description 116
- 239000002918 waste heat Substances 0.000 claims abstract description 76
- 238000010521 absorption reaction Methods 0.000 claims abstract description 26
- 230000001105 regulatory effect Effects 0.000 claims abstract description 18
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 82
- 239000003345 natural gas Substances 0.000 claims description 41
- 239000013535 sea water Substances 0.000 claims description 34
- 239000006200 vaporizer Substances 0.000 claims description 24
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 21
- 239000007788 liquid Substances 0.000 claims description 19
- 230000005540 biological transmission Effects 0.000 claims description 7
- 238000001816 cooling Methods 0.000 claims description 5
- 230000005611 electricity Effects 0.000 claims 1
- 239000003949 liquefied natural gas Substances 0.000 description 223
- 230000008569 process Effects 0.000 description 11
- 238000010586 diagram Methods 0.000 description 10
- 238000004519 manufacturing process Methods 0.000 description 8
- 238000004590 computer program Methods 0.000 description 7
- 230000006870 function Effects 0.000 description 6
- 238000012545 processing Methods 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 5
- 238000003912 environmental pollution Methods 0.000 description 5
- 238000002309 gasification Methods 0.000 description 4
- 238000009833 condensation Methods 0.000 description 3
- 238000007907 direct compression Methods 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000010742 number 1 fuel oil Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000012546 transfer Methods 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
- 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
- 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
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N5/00—Exhaust or silencing apparatus combined or associated with devices profiting by exhaust energy
- F01N5/02—Exhaust or silencing apparatus combined or associated with devices profiting by exhaust energy the devices using heat
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B63/00—Adaptations of engines for driving pumps, hand-held tools or electric generators; Portable combinations of engines with engine-driven devices
- F02B63/04—Adaptations of engines for driving pumps, hand-held tools or electric generators; Portable combinations of engines with engine-driven devices for electric generators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B27/00—Machines, plants or systems, using particular sources of energy
- F25B27/02—Machines, plants or systems, using particular sources of energy using waste heat, e.g. from internal-combustion engines
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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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/27—Relating to heating, ventilation or air conditioning [HVAC] technologies
- Y02A30/274—Relating to heating, ventilation or air conditioning [HVAC] technologies using waste energy, e.g. from internal combustion engine
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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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
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Abstract
The invention provides a receiving station LNG cold energy power generation and BOG recovery power generation coupling system and a method, wherein the system comprises: the system comprises an LNG cold energy power generation subsystem and a BOG power generation waste heat recovery subsystem; wherein: the LNG cold energy power generation subsystem includes: the system comprises a first heat exchanger 3, a second heat exchanger 11, a circulating working medium pump 12, a third heat exchanger 13 and an expansion generator 14; the BOG power generation waste heat recovery subsystem comprises: the system comprises a regulating valve 5, a gas generator set 7, an absorption heat exchanger set 8, a hot/cold user 9, a third heat exchanger 13 and a fourth heat exchanger 15.
Description
Technical Field
The invention relates to the field of comprehensive utilization of LNG (liquefied natural gas) receiving station energy, in particular to a system and a method for coupling LNG cold energy power generation and BOG (boil off gas) recovery power generation of a receiving station.
Background
With the development of global energy towards clean and low-carbon, natural gas will occupy an important position in the future energy pattern. As a high-quality, high-efficiency and clean low-carbon energy source, natural gas greatly improves the problem of environmental pollution compared with coal and fuel oil.
Natural gas is gaseous at normal temperature and pressure, and the production site is generally far from the user end, and in order to facilitate storage and transportation of natural gas, gaseous natural gas is usually liquefied into LNG (liquefied natural gas). From the current LNG production process, the production of 1 ton of LNG consumes about 850kWh of energy. The LNG stored in the receiving station needs to be gasified when in use, and about 240kWh of cold energy is released when 1 ton of LNG is gasified. If the cold energy released by the LNG in the gasification process is not recycled, the energy can be greatly wasted. At present, an open frame type seawater vaporizer or an immersed combustion type vaporizer is mainly adopted by a receiving station to vaporize LNG output by a pipeline. The former uses seawater as a heat source, the operation cost is low, but a large amount of LNG cold energy is discharged into a sea area near a receiving station, so that the temperature of the seawater is reduced, and cold pollution is caused to the ecological environment of the near sea area; the latter uses hot water as a heat source to produce hot water gasified LNG by burning natural gas, thereby consuming a certain amount of natural gas. In conclusion, the cold energy in the LNG gasification process of the receiving station is recovered, so that the energy can be saved, the gasification cost can be reduced, and the problem of environmental pollution caused by LNG gasification can be solved.
Since LNG is stored in an LNG storage tank at-162 c at normal pressure, a large amount of BOG (boil off gas of liquefied natural gas) is generated in the tank due to the influence of heat transfer from the environment outside the storage tank. In order to control the LNG tank pressure within a safe range, excess BOG must be handled. The BOG is processed by adopting any process, which is always the core technical problem of the LNG receiving station. At present, the commonly used BOG recovery processing technology of the LNG receiving station is a direct compression and re-cooling energy condensation technology, and both the technologies need to consume energy. Compared with direct compression, the re-condensation process utilizes the cold energy of LNG, so that the process is more energy-saving. However, when the fluctuation of the external gas output is large, the re-condensation process cannot effectively condense BOG into LNG, so that part of BOG is directly combusted and discharged, and energy is wasted.
Therefore, the cold energy and the BOG of the LNG of the receiving station are recovered by adopting an effective technical means, and the method has important significance for comprehensively utilizing the energy of the receiving station and reducing the energy waste.
Disclosure of Invention
The present invention aims to provide a receiving station LNG cold energy power generation and BOG recovery power generation coupling system and method that overcomes or at least partially solves the above mentioned problems.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
one aspect of the present invention provides a receiving station LNG cold energy power generation and BOG recovery power generation coupling system, including: the system comprises an LNG cold energy power generation subsystem and a BOG power generation waste heat recovery subsystem; wherein: the LNG cold energy power generation subsystem includes: the system comprises a first heat exchanger 3, a second heat exchanger 11, a circulating working medium pump 12, a third heat exchanger 13 and an expansion generator 14; the BOG power generation waste heat recovery subsystem comprises: the system comprises a regulating valve 5, a gas generator set 7, an absorption heat exchanger set 8, a hot/cold user 9, a third heat exchanger 13 and a fourth heat exchanger 15; the LNG storage tank 1 is connected with a first inlet of the first heat exchanger 3; a first outlet of the first heat exchanger 3 is connected with an inlet of the BOG storage tank 4, a second inlet of the first heat exchanger 3 is connected with an outlet of the expansion generator 14, and a second outlet of the first heat exchanger 3 is connected with a first inlet of the second heat exchanger 11; a second inlet of the second heat exchanger 11 is connected with an outlet of the LNG high-pressure pump 10, an inlet of the LNG high-pressure pump 10 is connected with an outlet of the low-pressure immersed pump 2 arranged in the LNG storage tank 1, a first outlet of the second heat exchanger 11 is connected with an inlet of the circulating working medium pump 12, and a second outlet of the second heat exchanger 11 is connected with a first inlet of the fourth heat exchanger 15; an outlet of the circulating working medium pump 12 is connected with a first inlet of a third heat exchanger 13, and a first outlet of the third heat exchanger 13 is connected with an inlet of an expansion generator 14; a first outlet of the fourth heat exchanger 15 is connected with a first inlet of the LNG vaporizer 17, and a second inlet of the fourth heat exchanger 15 is connected with a second outlet of the third heat exchanger 13; a second inlet of the LNG vaporizer 17 is connected to an outlet of the sea water pump 16; a first outlet of the BOG storage tank 4 is connected with an inlet of the regulating valve 5, a second outlet of the BOG storage tank 4 is connected with the town gas user 6, an outlet of the regulating valve 5 is connected with an inlet of the gas generator set 7, a first outlet of the gas generator set 7 is connected with a second inlet of the third heat exchanger 13, and a second outlet of the gas generator set 7 is connected with a first inlet of the absorption heat exchanger set 8; a first outlet of the absorption heat exchanger unit 8 is connected to an inlet of the hot/cold user 9 and a second inlet of the absorption heat exchanger unit 8 is connected to an outlet of the hot/cold user 9.
The invention also provides a receiving station LNG cold energy power generation and BOG recovery power generation coupling method executed by the receiving station LNG cold energy power generation and BOG recovery power generation coupling system, which comprises the following steps: BOG generated by the LNG storage tank and the circulating working medium after passing through the expansion generator carry out heat exchange in the first heat exchanger, so that the temperature of the BOG rises and the temperature of the circulating working medium drops, and the BOG with the raised temperature is stored in the BOG storage tank; one path of the natural gas output by the BOG storage tank is supplied to town gas users through a gas pipeline, and the other path of the natural gas is supplied to a gas generator set after the pressure and the flow of the natural gas are adjusted through an adjusting valve and the gas requirement of the gas generator set is met; one path of waste heat generated by the gas generator set is supplied to the absorption heat exchanger set to produce hot water or cold water for hot/cold users; the other path of the circulating working medium is subjected to heat exchange with the liquid circulating working medium boosted by the circulating working medium pump in a third heat exchanger, so that the circulating working medium is changed from a liquid state to a gaseous state, and the heat value of the power generation waste heat is reduced after heat exchange; the high-pressure gaseous circulating working medium pushes the expansion generator to do work and is changed into a low-pressure gaseous circulating working medium; the LNG in the LNG storage tank is conveyed to the outside of the storage tank by a low-pressure immersed pump positioned at the bottom of the LNG storage tank, the LNG is boosted by an LNG high-pressure pump, the boosted LNG and a circulating working medium subjected to heat exchange by a first heat exchanger are subjected to heat exchange in a second heat exchanger, the circulating working medium is changed into a liquid state from a gaseous state, and the temperature of the LNG subjected to heat exchange is increased; the LNG after temperature rise and the power generation waste heat after heat exchange of the third heat exchanger are subjected to heat exchange in the fourth heat exchanger, the temperature of the LNG is further increased, and the power generation waste heat is completely recovered and then output from a second outlet of the fourth heat exchanger; the LNG after the temperature is further raised and the seawater after the pressure is raised by the seawater pump are subjected to heat exchange in the LNG vaporizer, the LNG is changed into gaseous natural gas, and the gaseous natural gas is sent into a high-pressure pipeline after the external gas transmission condition is met.
Wherein, the method further comprises: when the LNG cold energy power generation subsystem stops running, BOG generated by the LNG storage tank is stored in the BOG storage tank, one path of natural gas from the BOG storage tank is supplied to town gas users through a gas pipeline, and the other path of natural gas is supplied to a gas generator set after the pressure and the flow of the gas are adjusted through an adjusting valve; one path of waste heat generated by power generation of the gas generator set is transmitted to the absorption heat exchanger set to produce hot water or cold water to be supplied to hot/cold users, the other path of waste heat and LNG boosted by the LNG high-pressure pump are subjected to heat exchange in the fourth heat exchanger, the temperature of the LNG is increased, and the waste heat is completely recovered and then output from a second outlet of the fourth heat exchanger.
Wherein, the method further comprises: the LNG is conveyed to the outside of the tank by the low-pressure immersed pump in the LNG storage tank, the LNG is boosted by the LNG high-pressure pump, the boosted LNG is subjected to heat exchange with power generation waste heat in the fourth heat exchanger, the LNG and seawater subjected to temperature rise are subjected to heat exchange in the LNG vaporizer, the LNG becomes gaseous natural gas, and the gaseous natural gas is conveyed into the high-pressure pipeline after meeting the external gas conveying condition.
Wherein, the method further comprises: when the BOG power generation part in the LNG cold energy power generation electronic system and the BOG power generation waste heat recovery subsystem stops running, the BOG generated by the LNG storage tank is stored in the BOG storage tank and is supplied to town gas users through a gas pipeline; LNG conveyed to the outside of the storage tank by the low-pressure immersed pump in the LNG storage tank is subjected to pressure boosting by the LNG high-pressure pump, and then is subjected to heat exchange with seawater in the LNG vaporizer, and is conveyed into a high-pressure pipeline after meeting the external gas conveying condition.
Wherein, the method further comprises: when the waste heat supply/cooling part in the BOG power generation waste heat recovery subsystem stops operating, the waste heat generated by the gas generator set is directly used for gasifying the liquid circulating working medium of the cold energy power generation system and transporting LNG out of the storage tank.
Wherein, the method further comprises: the temperature of the seawater is low, when the seawater pump stops operating, LNG output from the LNG storage tank is boosted by the LNG high-pressure pump, and exchanges heat with the circulating working medium of the cold energy power generation system and the power generation waste heat in the second heat exchanger and the fourth heat exchanger respectively, and the LNG is sent into a high-pressure pipeline after meeting the external gas transmission condition through the fourth heat exchanger.
Therefore, the coupling system and the method for receiving the LNG cold energy power generation and BOG recovery power generation of the receiving station have the advantages that the BOG generated by the LNG storage tank is used as the gas source of the gas generator set, the waste heat generated by the generator set can be used for producing heat and cold, and meanwhile, the waste heat is also used as the circulating working medium of the LNG cold energy power generation system and the heat source for gasifying the LNG output from the storage tank; the LNG cold energy power generation system circulating working medium not only recovers the cold energy of LNG output from the storage tank, but also recovers the cold energy of BOG. Therefore, the embodiment can effectively process the BOG of the receiving station, can also improve the comprehensive utilization efficiency of the energy of the receiving station, reduces the production cost of the receiving station and prevents the environmental pollution problem caused by direct emission of the BOG. The LNG cold energy and the energy waste problem of the existing BOG treatment process existing in the LNG receiving station in the prior art can be effectively solved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a receiving station LNG cold energy power generation and BOG recovery power generation coupling system according to an embodiment of the present invention.
Description of reference numerals:
an LNG storage tank; 2. a low-pressure immersed pump; 3. a first heat exchanger; 4, a BOG storage tank; 5. adjusting a valve; 6. urban gas users; 7. a gas generator set; 8. an absorption heat exchanger unit; 9. hot/cold users; 10, an LNG high pressure pump; 11. a second heat exchanger; 12. a circulating working medium pump; 13. a third heat exchanger; 14. an expansion generator; 15. a fourth heat exchanger; 16. a sea water pump; an LNG vaporizer.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
Fig. 1 shows a schematic structural diagram of a receiving station LNG cold energy power generation and BOG recovery power generation coupling system provided in an embodiment of the present invention, and referring to fig. 1, the receiving station LNG cold energy power generation and BOG recovery power generation coupling system provided in an embodiment of the present invention includes:
the system comprises an LNG cold energy power generation subsystem and a BOG power generation waste heat recovery subsystem; wherein:
the LNG cold energy power generation subsystem includes: the system comprises a first heat exchanger 3, a second heat exchanger 11, a circulating working medium pump 12, a third heat exchanger 13 and an expansion generator 14;
the BOG power generation waste heat recovery subsystem comprises: the system comprises a regulating valve 5, a gas generator set 7, an absorption heat exchanger set 8, a hot/cold user 9, a third heat exchanger 13 and a fourth heat exchanger 15;
the LNG storage tank 1 is connected with a first inlet of the first heat exchanger 3;
a first outlet of the first heat exchanger 3 is connected with an inlet of the BOG storage tank 4, a second inlet of the first heat exchanger 3 is connected with an outlet of the expansion generator 14, and a second outlet of the first heat exchanger 3 is connected with a first inlet of the second heat exchanger 11;
a second inlet of the second heat exchanger 11 is connected with an outlet of the LNG high-pressure pump 10, an inlet of the LNG high-pressure pump 10 is connected with an outlet of the low-pressure immersed pump 2 arranged in the LNG storage tank 1, a first outlet of the second heat exchanger 11 is connected with an inlet of the circulating working medium pump 12, and a second outlet of the second heat exchanger 11 is connected with a first inlet of the fourth heat exchanger 15;
an outlet of the circulating working medium pump 12 is connected with a first inlet of a third heat exchanger 13, and a first outlet of the third heat exchanger 13 is connected with an inlet of an expansion generator 14;
a first outlet of the fourth heat exchanger 15 is connected with a first inlet of the LNG vaporizer 17, and a second inlet of the fourth heat exchanger 15 is connected with a second outlet of the third heat exchanger 13;
a second inlet of the LNG vaporizer 17 is connected to an outlet of the sea water pump 16;
a first outlet of the BOG storage tank 4 is connected with an inlet of the regulating valve 5, a second outlet of the BOG storage tank 4 is connected with the town gas user 6, an outlet of the regulating valve 5 is connected with an inlet of the gas generator set 7, a first outlet of the gas generator set 7 is connected with a second inlet of the third heat exchanger 13, and a second outlet of the gas generator set 7 is connected with a first inlet of the absorption heat exchanger set 8;
a first outlet of the absorption heat exchanger unit 8 is connected to an inlet of the hot/cold user 9 and a second inlet of the absorption heat exchanger unit 8 is connected to an outlet of the hot/cold user 9.
Specifically, referring to fig. 1, the receiving station LNG cold energy power generation and BOG recovery power generation coupling system provided by the embodiment of the present invention includes the following components: the system comprises an LNG storage tank 1, a low-pressure immersed pump 2, a first heat exchanger 3, a BOG storage tank 4, a regulating valve 5, a town gas user 6, a gas generator set 7, an absorption heat exchange unit 8, a hot/cold user 9, an LNG high-pressure pump 10, a second heat exchanger 11, a circulating working medium pump 12, a third heat exchanger 13, an expansion generator 14, a fourth heat exchanger 15, a sea water pump 16 and an LNG gasifier 17.
The receiving station LNG cold energy power generation and BOG recovery power generation coupling system provided by the embodiment of the invention comprises: the system comprises an LNG cold energy power generation subsystem and a BOG power generation waste heat recovery subsystem, wherein the LNG cold energy power generation subsystem comprises a first heat exchanger 3, a second heat exchanger 11, a circulating working medium pump 12, a third heat exchanger 13 and an expansion generator 14; the BOG power generation waste heat recovery subsystem comprises: the system comprises a regulating valve 5, a gas generator set 7, an absorption heat exchanger set 8, a hot (cold) user 9, a third heat exchanger 13 and a fourth heat exchanger 15.
BOG generated by the LNG storage tank 1 is connected with a first inlet of a first heat exchanger 3 through a low-temperature pipeline, a first outlet of the first heat exchanger 3 is connected with an inlet of a BOG storage tank 4, a second inlet of the first heat exchanger 3 is connected with an outlet of an expansion generator 14, and a second outlet of the first heat exchanger 3 is connected with a first inlet of a second heat exchanger 11; a second inlet of the second heat exchanger 11 is connected with an outlet of the LNG high-pressure pump 10, a first outlet of the second heat exchanger 11 is connected with an inlet of the circulating working medium pump 12, and a second outlet of the second heat exchanger 11 is connected with a first inlet of the fourth heat exchanger 15; a first outlet of the fourth heat exchanger 15 is connected with a first inlet of the LNG vaporizer 17, and a second inlet is connected with a first outlet of the third heat exchanger; a second inlet of the LNG vaporizer 17 is connected to an outlet of the sea water pump 16. Therefore, the LNG cold energy power generation function can be realized.
The natural gas output by the BOG storage tank 4 is divided into two paths: one path is connected with a gas inlet of a town gas user 6; the other path is connected with an inlet of a regulating valve 5, and an outlet of the regulating valve 5 is connected with a gas inlet of a gas generator set 7; the waste heat generated by the gas generator set 7 is divided into two paths: one path is connected with an inlet of the absorption heat exchanger unit 8; the other path is connected with a second inlet of the third heat exchanger 13; a second outlet of the third heat exchanger 13 is connected with a second inlet of the fourth heat exchanger 15, a first inlet is connected with an outlet of the circulating working medium pump 12, and a first outlet is connected with an inlet of the expansion generator 14; the outlet of the low-pressure immersed pump 2 located at the bottom of the LNG storage tank is connected to the inlet of the LNG high-pressure pump 10. Therefore, the BOG power generation waste heat recovery function can be realized.
The following provides a receiving station LNG cold energy power generation and BOG recovery power generation coupling method, which is applied to the receiving station LNG cold energy power generation and BOG recovery power generation coupling system, and only briefly describes the receiving station LNG cold energy power generation and BOG recovery power generation coupling method provided in the embodiments of the present invention, and please refer to the description related to the receiving station LNG cold energy power generation and BOG recovery power generation coupling system for other inexhaustible matters, and the receiving station LNG cold energy power generation and BOG recovery power generation coupling method provided in the embodiments of the present invention includes:
s1, heat exchange is carried out between BOG generated by the LNG storage tank and the circulating working medium after passing through the expansion generator in the first heat exchanger, so that the temperature of the BOG rises and the temperature of the circulating working medium drops, and the BOG with the raised temperature is stored in the BOG storage tank;
s2, supplying one path of natural gas output by the BOG storage tank to town gas users through a gas pipeline, and supplying the other path of natural gas to a gas generator set after regulating the pressure and flow of the natural gas through a regulating valve and meeting the gas consumption requirement of the gas generator set;
s3, supplying one path of waste heat generated by the gas generator set to the absorption heat exchanger set to produce hot water or cold water for hot/cold users; the other path of the circulating working medium is subjected to heat exchange with the liquid circulating working medium boosted by the circulating working medium pump in a third heat exchanger, so that the circulating working medium is changed from a liquid state to a gaseous state, and the heat value of the power generation waste heat is reduced after heat exchange;
s4, the high-pressure gaseous circulating working medium pushes the expansion generator to do work and changes the expansion generator into a low-pressure gaseous circulating working medium;
s5, the low-pressure immersed pump located at the bottom of the LNG storage tank conveys LNG in the LNG storage tank to the outside of the storage tank, the LNG is boosted through the LNG high-pressure pump, the boosted LNG and the circulating working medium subjected to heat exchange through the first heat exchanger are subjected to heat exchange in the second heat exchanger, the circulating working medium is changed into a liquid state from a gaseous state, and the temperature of the LNG subjected to heat exchange is increased;
s6, exchanging heat between the LNG with the increased temperature and the power generation waste heat exchanged by the third heat exchanger in a fourth heat exchanger, further increasing the temperature of the LNG, and completely recovering the power generation waste heat and then outputting the power generation waste heat from a second outlet of the fourth heat exchanger;
and S7, exchanging heat between the LNG after the temperature is further increased and the seawater after being pressurized by the seawater pump in the LNG vaporizer, and converting the LNG into gaseous natural gas which is sent into a high-pressure pipeline after meeting the external gas transmission condition.
Specifically, the circulating working medium of the LNG cold power generation system is changed into a gaseous state through the expansion generator 14, exchanges heat with the BOG coming out of the LNG storage tank 1 in the first heat exchanger 3, the temperature of the circulating working medium is reduced, exchanges heat with the LNG coming out of the LNG storage tank 1 in the second heat exchanger 11, the temperature of the circulating working medium is further reduced, the gaseous state is changed into a liquid state, the pressure of the circulating working medium is increased through the circulating working medium pump 12, the circulating working medium is changed into high-pressure gas after exchanging heat with the waste heat of the gas generator set 7 in the third heat exchanger 13, the expansion generator 14 is pushed to do work, and therefore the whole cold power generation cycle is completed.
BOG generated by the LNG storage tank 1 exchanges heat with the circulating working medium generated by the expansion generator 14 in the first heat exchanger 3, so that the temperature of the BOG rises and the temperature of the circulating working medium drops, and the BOG with the raised temperature is stored in the BOG storage tank 4; the natural gas output by the BOG storage tank 4 is divided into two paths: one path is supplied to downstream town gas users 6 through a gas pipeline; and the other path of the gas is regulated by a regulating valve 5 to regulate the pressure and the flow of the gas and then is supplied to a gas generator set 7.
Further, if the natural gas in the BOG storage tank 4 just meets the demand of the gas-turbine generator set 7, or the BOG storage tank 4 has no dockable downstream town gas users 6, the natural gas output from the BOG storage tank 4 is all used to supply the gas-turbine generator set 7.
The power generation waste heat (including high-temperature flue gas, steam or hot water) generated by the gas generator set 7 is divided into two paths: one path is supplied to an absorption heat exchanger unit 8 and is used for producing hot water or cold water to supply hot (cold) users 9; the other path of the circulating working medium is subjected to heat exchange with the liquid circulating working medium boosted by the circulating working medium pump 12 in the third heat exchanger 13, and the circulating working medium is changed from a high-pressure liquid state to a high-pressure gas state to push the expansion generator 14 to generate power.
Further, if the waste heat generated by the gas generator set 7 just meets the heat required for gasifying the liquid circulating working medium boosted by the circulating working medium pump 12 and the LNG boosted by the LNG high-pressure pump 10, the power generation waste heat is completely used for meeting the heat requirements of the liquid circulating working medium boosted by the circulating working medium pump 12 and the LNG boosted by the LNG high-pressure pump 10.
As an optional implementation manner of the embodiment of the present invention, the method for coupling LNG cold energy power generation and BOG recovery power generation for a receiving station provided in the embodiment of the present invention further includes: the LNG is conveyed to the outside of the tank by the low-pressure immersed pump in the LNG storage tank, the LNG is boosted by the LNG high-pressure pump, the boosted LNG is subjected to heat exchange with power generation waste heat in the fourth heat exchanger, the LNG and seawater subjected to temperature rise are subjected to heat exchange in the LNG vaporizer, the LNG becomes gaseous natural gas, and the gaseous natural gas is conveyed into the high-pressure pipeline after meeting the external gas conveying condition.
The LNG in the LNG storage tank 1 is conveyed to the outside of the storage tank by the low-pressure immersed pump 2 positioned at the bottom of the LNG storage tank 1, the LNG is boosted by the LNG high-pressure pump 10, the boosted LNG and the circulating working medium subjected to heat exchange by the first heat exchanger 3 are subjected to heat exchange in the second heat exchanger 11, the circulating working medium is changed into a liquid state from a gaseous state, and the temperature of the LNG subjected to heat exchange is increased; the LNG after temperature rise and the power generation waste heat after heat exchange by the third heat exchanger 13 are subjected to heat exchange in the fourth heat exchanger 15, the temperature of the LNG is further raised, and the power generation waste heat is completely recovered and then output from a second outlet of the fourth heat exchanger 15; the LNG having the increased temperature and the seawater having been pressurized by the seawater pump 16 are heat-exchanged in the LNG vaporizer 17, so that the LNG is completely changed into a gaseous natural gas and is fed into the high-pressure pipeline.
As an optional implementation manner of the embodiment of the present invention, the method for coupling LNG cold energy power generation and BOG recovery power generation for a receiving station provided in the embodiment of the present invention further includes: when the LNG cold energy power generation subsystem stops running, BOG generated by the LNG storage tank is stored in the BOG storage tank, one path of natural gas from the BOG storage tank is supplied to town gas users through a gas pipeline, and the other path of natural gas is supplied to a gas generator set after the pressure and the flow of the gas are adjusted through an adjusting valve; one path of waste heat generated by power generation of the gas generator set is transmitted to the absorption heat exchanger set to produce hot water or cold water to be supplied to hot/cold users, the other path of waste heat and LNG boosted by the LNG high-pressure pump are subjected to heat exchange in the fourth heat exchanger, the temperature of the LNG is increased, and the waste heat is completely recovered and then output from a second outlet of the fourth heat exchanger.
Further, when the LNG cold energy power generation subsystem stops operating, the BOG generated by the LNG storage tank 1 is stored in the BOG storage tank 4, and the natural gas coming out of the BOG storage tank 4 is divided into two paths: one path is supplied to town gas users 6 through a pipeline; the other path of the gas is supplied to a gas generator set 7 after the pressure and the flow of the gas are adjusted by an adjusting valve 5; the waste heat generated by the power generation of the gas generator set 7 is divided into two paths: one path of waste heat is transmitted to the absorption heat exchange unit 8 to produce hot water or cold water for supplying hot (cold) users; the other path of waste heat and the LNG boosted by the LNG high-pressure pump 10 are subjected to heat exchange in the fourth heat exchanger 15, the temperature of the LNG is raised, and the waste heat is completely recovered and then output from a second outlet of the fourth heat exchanger 15; the LNG is conveyed to the outside of the tank by the in-tank low-pressure immersed pump 2, the LNG is boosted by the LNG high-pressure pump 10, the boosted LNG and the power generation waste heat exchange in the fourth heat exchanger 15, the LNG and the seawater after temperature rise further exchange heat in the LNG vaporizer 17, and the LNG is completely changed into gaseous natural gas and is sent into a high-pressure pipeline.
As an optional implementation manner of the embodiment of the present invention, the method for coupling LNG cold energy power generation and BOG recovery power generation for a receiving station provided in the embodiment of the present invention further includes: when the BOG power generation part in the LNG cold energy power generation electronic system and the BOG power generation waste heat recovery subsystem stops running, the BOG generated by the LNG storage tank is stored in the BOG storage tank and is supplied to town gas users through a gas pipeline; LNG conveyed to the outside of the storage tank by the low-pressure immersed pump in the LNG storage tank is subjected to pressure boosting by the LNG high-pressure pump, and then is subjected to heat exchange with seawater in the LNG vaporizer, and is conveyed into a high-pressure pipeline after meeting the external gas conveying condition.
Further, when the BOG power generation part in the LNG cold energy power generation subsystem and the BOG power generation waste heat recovery subsystem stops running, the BOG generated by the LNG storage tank 1 is stored in the BOG storage tank 4 and is supplied to the town gas user 6 through a gas pipeline; LNG conveyed to the outside of the storage tank by the low-pressure immersed pump 2 in the LNG storage tank 1 is boosted by the LNG high-pressure pump 10, then is subjected to heat exchange with seawater in the LNG vaporizer 17, and is conveyed into a high-pressure pipeline after meeting the external gas conveying condition.
As an optional implementation manner of the embodiment of the present invention, the method for coupling LNG cold energy power generation and BOG recovery power generation for a receiving station provided in the embodiment of the present invention further includes: when the waste heat supply/cooling part in the BOG power generation waste heat recovery subsystem stops operating, the waste heat generated by the gas generator set is directly used for gasifying the liquid circulating working medium of the cold energy power generation system and transporting LNG out of the storage tank.
Further, when the waste heat supply/cooling part in the BOG power generation waste heat recovery subsystem stops operating, the waste heat generated by the gas generator set 7 is directly used for gasifying the liquid circulating working medium of the LNG cold energy power generation system and the LNG conveyed outwards by the LNG storage tank 1.
As an optional implementation manner of the embodiment of the present invention, the method for coupling LNG cold energy power generation and BOG recovery power generation for a receiving station provided in the embodiment of the present invention further includes: the temperature of the seawater is low, when the seawater pump stops operating, LNG output from the LNG storage tank is boosted by the LNG high-pressure pump, and exchanges heat with the circulating working medium of the cold energy power generation system and the power generation waste heat in the second heat exchanger and the fourth heat exchanger respectively, and the LNG is sent into a high-pressure pipeline after meeting the external gas transmission condition through the fourth heat exchanger.
Further, when the seawater pump stops operating, the LNG which is transported from the LNG storage tank 1 to the outside is boosted by the LNG high-pressure pump 10, heat exchange is respectively carried out between the LNG high-pressure pump and the circulating working medium in the second heat exchanger 11 and the fourth heat exchanger 15, and the natural gas after heat exchange by the fourth heat exchanger 15 meets the external gas transmission condition and is then sent to the high-pressure pipeline.
Therefore, according to the receiving station LNG cold energy power generation and BOG recovery power generation coupling system and method provided by the embodiment of the invention, the BOG generated by the LNG storage tank is used as the gas source of the gas generator set, and the waste heat generated by the generator set can be used for producing heat and cold and is also used as the circulating working medium of the LNG cold energy power generation system and the heat source for gasifying the LNG output from the storage tank; the LNG cold energy power generation system circulating working medium not only recovers the cold energy of LNG output from the storage tank, but also recovers the cold energy of BOG. Therefore, the embodiment can effectively process the BOG of the receiving station, can also improve the comprehensive utilization efficiency of the energy of the receiving station, reduces the production cost of the receiving station and prevents the environmental pollution problem caused by direct emission of the BOG.
Compared with the prior art, the LNG cold energy power generation and BOG recovery power generation coupling system for the receiving station provided by the embodiment of the invention has the beneficial effects that:
1. BOG generated by the LNG storage tank is stored in the BOG storage tank and is supplied in two ways: one path is used as gas for town gas users; the other path is used as the gas source of the gas generator set. The BOG recovery mode avoids the problem of overhigh BOG processing energy consumption caused by adopting a direct compression process, thereby reducing the production cost of a receiving station and preventing the problem of environmental pollution caused by direct discharge of the BOG.
And 2, BOG and LNG cold energy are recovered by the circulating working medium in the LNG cold energy power generation system through the first heat exchanger and the second heat exchanger for twice heat exchange, and power generation waste heat is recovered through the third heat exchanger, so that the efficiency of LNG cold energy power generation is improved by the circulating system.
3. The waste heat generated by the gas generator set is supplied to the absorption heat exchanger set to produce hot water or cold water, so that the energy demand of hot/cold users is met, the waste heat is also used as a circulating working medium of an LNG cold energy power generation system and a heat source of LNG transported out of a storage tank, the waste heat generated by the gas generator set is fully recovered, the comprehensive energy utilization efficiency of a receiving station is improved, and the production and operation cost of the receiving station is reduced.
When the LNG cold energy power generation system does not operate, the LNG output from the storage tank meets the output requirement by recovering the waste heat of the gas generator set and then exchanging heat through the LNG gasifier; when the LNG cold energy power generation system and the BOG power generation system do not operate, the LNG output from the storage tank directly exchanges heat with seawater in the LNG vaporizer to meet the output requirement; the BOG power generation system operates, and when the sea water pump stops operating, the LNG output from the storage tank directly recovers the waste heat of the gas generator set to meet the output requirement. Therefore, the system is flexible to operate and can meet the operation requirements of the receiving station under different working conditions.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
In a typical configuration, a computing device includes one or more processors (CPUs), input/output interfaces, network interfaces, and memory.
The memory may include forms of volatile memory in a computer readable medium, Random Access Memory (RAM) and/or non-volatile memory, such as Read Only Memory (ROM) or flash memory (flash RAM). The memory is an example of a computer-readable medium.
Computer-readable media, including both non-transitory and non-transitory, removable and non-removable media, may implement information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), Static Random Access Memory (SRAM), Dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), Read Only Memory (ROM), Electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), Digital Versatile Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transmission medium that can be used to store information that can be accessed by a computing device. As defined herein, a computer readable medium does not include a transitory computer readable medium such as a modulated data signal and a carrier wave.
The above are merely examples of the present application and are not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.
Claims (7)
1. The utility model provides a receiving station LNG cold energy electricity generation and BOG recovery power generation coupled system which characterized in that includes:
the system comprises an LNG cold energy power generation subsystem and a BOG power generation waste heat recovery subsystem; wherein:
the LNG cold energy power generation subsystem includes: the system comprises a first heat exchanger (3), a second heat exchanger (11), a circulating working medium pump (12), a third heat exchanger (13) and an expansion generator (14);
the BOG power generation waste heat recovery subsystem comprises: the system comprises a regulating valve (5), a gas generator set (7), an absorption heat exchanger set (8), a hot/cold user (9), a third heat exchanger (13) and a fourth heat exchanger (15);
the LNG storage tank (1) is connected with a first inlet of the first heat exchanger (3);
a first outlet of the first heat exchanger (3) is connected with an inlet of the BOG storage tank (4), a second inlet of the first heat exchanger (3) is connected with an outlet of the expansion generator (14), and a second outlet of the first heat exchanger (3) is connected with a first inlet of the second heat exchanger (11);
a second inlet of the second heat exchanger (11) is connected with an outlet of an LNG high-pressure pump (10), an inlet of the LNG high-pressure pump (10) is connected with an outlet of a low-pressure immersed pump (2) arranged in the LNG storage tank (1), a first outlet of the second heat exchanger (11) is connected with an inlet of a circulating working medium pump (12), and a second outlet of the second heat exchanger (11) is connected with a first inlet of a fourth heat exchanger (15);
the outlet of the circulating working medium pump (12) is connected with the first inlet of the third heat exchanger (13), and the first outlet of the third heat exchanger (13) is connected with the inlet of the expansion generator (14);
a first outlet of the fourth heat exchanger (15) is connected with a first inlet of the LNG vaporizer (17), and a second inlet of the fourth heat exchanger (15) is connected with a second outlet of the third heat exchanger (13);
a second inlet of the LNG vaporizer (17) is connected with an outlet of a seawater pump (16);
a first outlet of the BOG storage tank (4) is connected with an inlet of the regulating valve (5), a second outlet of the BOG storage tank (4) is connected with a town gas user (6), an outlet of the regulating valve (5) is connected with an inlet of the gas generator set (7), a first outlet of the gas generator set (7) is connected with a second inlet of the third heat exchanger (13), and a second outlet of the gas generator set (7) is connected with a first inlet of the absorption heat exchanger set (8);
the first outlet of the absorption heat exchanger unit (8) is connected with the inlet of the hot/cold user (9), and the second inlet of the absorption heat exchanger unit (8) is connected with the outlet of the hot/cold user (9).
2. A receiving station LNG cold power generation and BOG recovery power generation coupling method performed by the receiving station LNG cold power generation and BOG recovery power generation coupling system according to claim 1, comprising:
BOG generated by the LNG storage tank and the circulating working medium after passing through the expansion generator carry out heat exchange in the first heat exchanger, so that the temperature of the BOG rises and the temperature of the circulating working medium drops, and the BOG with the raised temperature is stored in the BOG storage tank;
one path of the natural gas output by the BOG storage tank is supplied to town gas users through a gas pipeline, and the other path of the natural gas is supplied to the gas generator set after the pressure and the flow of the natural gas are adjusted through an adjusting valve and the gas requirement of the gas generator set is met;
one path of waste heat generated by the gas generator set is supplied to the absorption heat exchanger set, and hot water or cold water is produced and supplied to hot/cold users; the other path of the circulating working medium is subjected to heat exchange with the liquid circulating working medium boosted by the circulating working medium pump in a third heat exchanger, so that the circulating working medium is changed from a liquid state to a gaseous state, and the heat value of the power generation waste heat is reduced after heat exchange;
the high-pressure gaseous circulating working medium pushes the expansion generator to do work and is changed into a low-pressure gaseous circulating working medium;
the LNG in the LNG storage tank is conveyed to the outside of the storage tank by a low-pressure immersed pump positioned at the bottom of the LNG storage tank, the LNG is boosted by an LNG high-pressure pump, the boosted LNG and a circulating working medium subjected to heat exchange by a first heat exchanger are subjected to heat exchange in a second heat exchanger, the circulating working medium is changed into a liquid state from a gaseous state, and the temperature of the LNG subjected to heat exchange is increased;
the LNG after temperature rise and the power generation waste heat after heat exchange of the third heat exchanger are subjected to heat exchange in the fourth heat exchanger, the temperature of the LNG is further increased, and the power generation waste heat is completely recovered and then output from a second outlet of the fourth heat exchanger;
the LNG after the temperature is further raised and the seawater after the pressure is raised by the seawater pump are subjected to heat exchange in the LNG vaporizer, the LNG is changed into gaseous natural gas, and the gaseous natural gas is sent into a high-pressure pipeline after the external gas transmission condition is met.
3. The method of claim 2, further comprising:
when the LNG cold energy power generation subsystem stops running, BOG generated by the LNG storage tank is stored in the BOG storage tank, one path of natural gas from the BOG storage tank is supplied to town gas users through a gas pipeline, and the other path of natural gas is supplied to a gas generator set after the pressure and the flow of the gas are adjusted through an adjusting valve;
one path of waste heat generated by power generation of the gas generator set is transmitted to the absorption heat exchanger set to produce hot water or cold water to be supplied to hot/cold users, the other path of waste heat and LNG boosted by the LNG high-pressure pump are subjected to heat exchange in the fourth heat exchanger, the temperature of the LNG is increased, and the waste heat is completely recovered and then output from a second outlet of the fourth heat exchanger.
4. The method of claim 2, further comprising:
the LNG storage tank is characterized in that the LNG is conveyed to the outside of the tank by the low-pressure immersed pump, the LNG is boosted by the LNG high-pressure pump, the boosted LNG and the power generation waste heat exchange in the fourth heat exchanger, the LNG with the increased temperature and seawater exchange heat in the LNG vaporizer, the LNG becomes gaseous natural gas, and the gaseous natural gas is conveyed into a high-pressure pipeline after meeting the external gas conveying condition.
5. The method of claim 2, further comprising:
when the BOG power generation part in the LNG cold energy power generation electronic system and the BOG power generation waste heat recovery subsystem stops running, the BOG generated by the LNG storage tank is stored in the BOG storage tank and is supplied to town gas users through a gas pipeline; LNG conveyed to the outside of the storage tank by the low-pressure immersed pump in the LNG storage tank is subjected to pressure boosting by the LNG high-pressure pump, then is subjected to heat exchange with seawater in the LNG vaporizer, and is conveyed into a high-pressure pipeline after meeting the external gas conveying condition.
6. The method of claim 2, further comprising:
when the waste heat supply/cooling part in the BOG power generation waste heat recovery subsystem stops operating, the waste heat generated by the gas generator set is directly used for gasifying the liquid circulating working medium of the cold energy power generation system and transporting LNG out of the storage tank.
7. The method of claim 2, further comprising:
when the seawater temperature is low, the LNG output from the LNG storage tank is boosted by the LNG high-pressure pump when the seawater pump stops operating, and is respectively subjected to heat exchange with the circulating working medium of the cold energy power generation system and the power generation waste heat in the second heat exchanger and the fourth heat exchanger, and the LNG is sent into a high-pressure pipeline after meeting the external gas output condition through the fourth heat exchanger.
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