CN116412010A - LNG cold energy cold accumulation power generation coupling system and method using carbon dioxide as refrigerant - Google Patents

LNG cold energy cold accumulation power generation coupling system and method using carbon dioxide as refrigerant Download PDF

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Publication number
CN116412010A
CN116412010A CN202310428042.4A CN202310428042A CN116412010A CN 116412010 A CN116412010 A CN 116412010A CN 202310428042 A CN202310428042 A CN 202310428042A CN 116412010 A CN116412010 A CN 116412010A
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carbon dioxide
lng
gasifier
power generation
cold
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Inventor
赖建波
罗祥平
常旭宁
张奕
侯谨城
艾绍平
郭保玲
王佩广
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Beijing Gas Group Co Ltd
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Beijing Gas Group Co Ltd
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Priority to CN202310428042.4A priority Critical patent/CN116412010A/en
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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
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D3/00—Devices using other cold materials; Devices using cold-storage bodies
    • F25D3/10—Devices using other cold materials; Devices using cold-storage bodies using liquefied gases, e.g. liquid air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
    • F01D15/10—Adaptations for driving, or combinations with, electric generators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K25/00—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for
    • F01K25/08—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for using special vapours
    • F01K25/10—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for using special vapours the vapours being cold, e.g. ammonia, carbon dioxide, ether
    • F01K25/103—Carbon dioxide
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K27/00—Plants for converting heat or fluid energy into mechanical energy, not otherwise provided for
    • 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
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/14—Thermal energy storage

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)

Abstract

The invention discloses an LNG cold energy cold accumulation power generation coupling system and method using carbon dioxide as a refrigerant, and relates to a system and method for utilizing LNG cold energy. The LNG cold energy cold accumulation power generation coupling system and method can solve the problem of LNG cold energy fluctuation, improve cold energy utilization efficiency and reduce environmental pollution, and takes carbon dioxide as a refrigerant. The LNG cold energy cold accumulation power generation coupling system taking carbon dioxide as a refrigerant comprises an LNG cold energy cold accumulation subsystem and a power generation subsystem which are connected through a carbon dioxide cold accumulation liquid storage tank, wherein the LNG cold energy cold accumulation subsystem comprises a carbon dioxide condenser and a carbon dioxide cold accumulation liquid storage tank, the carbon dioxide condenser is connected with an LNG air source, a first vaporizer and the carbon dioxide cold accumulation liquid storage tank, and the first vaporizer is connected with a water circulation channel; the carbon dioxide cold accumulation liquid storage tank is also connected with a second gasifier, the second gasifier is connected with a third gasifier and an outlet of the power generation equipment, and the third gasifier is connected with a heat exchange channel and an inlet of the power generation equipment.

Description

LNG cold energy cold accumulation power generation coupling system and method using carbon dioxide as refrigerant
Technical Field
The invention relates to the technical field of LNG cold energy utilization, in particular to an LNG cold energy cold storage power generation coupling system and method using carbon dioxide as a refrigerant.
Background
LNG is a low-temperature (-162 ℃) liquid mixture which is obtained by deacidifying and dehydrating natural gas and freezing and liquefying the natural gas through a low-temperature process. LNG stored in the storage tanks is vaporized before it can be supplied to downstream gas users. The electricity required to produce 1 ton of LNG is about 850kWh and vaporizing 1 ton of LNG releases 830 megajoules to 860 megajoules of cold energy. Theoretically, the available refrigeration capacity for gasification of 1 ton of LNG is 230kWh. In general, LNG is directly discarded without recovering cold energy in the gasification process, which causes not only waste of a large amount of energy but also pollution of the surrounding environment.
There are various LNG cold energy utilization modes including cold energy air separation, cold energy power generation, cold energy dry ice production, etc. In the aspect of cold energy power generation, an LNG cold energy power generation mode adopted by the LNG receiving stations at home and abroad is a cold energy power generation cycle based on an intermediate medium gasifier (IFV gasifier), and propane is usually selected as an intermediate medium (refrigerant) in the power generation cycle. The whole cold energy power generation process flow is that after the gaseous propane as an intermediate medium absorbs LNG cold energy, the gaseous propane is changed into liquid, then the liquid propane is pressurized by a propane pump to form high-pressure propane liquid, the liquid propane is heated by seawater to be gaseous propane, and the gaseous propane with pressure drives a generator through expansion work of a turbine engine, so that the power generation of the LNG cold energy is realized. The LNG cold energy power generation mode is to use the IFV gasifier, and in addition, the LNG cold energy power generation amount based on the IFV gasifier cannot be effectively matched with the LNG gasification scale fluctuation of the receiving station, so that a large amount of LNG cold energy is wasted, and the economy of an LNG cold energy power generation project is affected.
Disclosure of Invention
The invention aims to solve the technical problem of providing an LNG cold energy cold accumulation power generation coupling system and an LNG cold energy accumulation power generation coupling method which can solve the problem of LNG cold energy fluctuation, improve cold energy utilization efficiency and reduce environmental pollution and take carbon dioxide as a refrigerant.
The technical proposal provided by the invention is that the LNG cold energy cold storage power generation coupling system taking carbon dioxide as a refrigerant comprises an LNG cold energy cold storage subsystem and an LNG power generation subsystem which are connected through a carbon dioxide cold storage liquid storage tank,
the LNG cold energy cold accumulation subsystem comprises a carbon dioxide condenser and a carbon dioxide cold accumulation liquid storage tank, an LNG inlet in the carbon dioxide condenser is connected with an LNG source, an LNG outlet in the carbon dioxide condenser is connected with an inlet of a first gasifier, a gaseous carbon dioxide inlet in the carbon dioxide condenser is connected with a gaseous carbon dioxide outlet of the carbon dioxide cold accumulation liquid storage tank, a liquid carbon dioxide outlet in the carbon dioxide condenser is connected with a liquid carbon dioxide inlet of the carbon dioxide cold accumulation liquid storage tank, and the first gasifier is connected with a water circulation channel;
the LNG cold energy power generation subsystem also comprises the carbon dioxide cold accumulation liquid storage tank, a liquid carbon dioxide outlet of the carbon dioxide cold accumulation liquid storage tank is connected with a liquid carbon dioxide inlet of the second gasifier, a liquid carbon dioxide outlet of the second gasifier is connected with a liquid carbon dioxide inlet of the third gasifier, a gaseous carbon dioxide outlet of the second gasifier is connected with a gaseous carbon dioxide inlet of the carbon dioxide cold accumulation liquid storage tank, the third gasifier is connected with a heat exchange channel, a gaseous carbon dioxide outlet of the third gasifier is connected with an inlet of power generation equipment, and an outlet of the power generation equipment is connected with a gaseous carbon dioxide inlet of the second gasifier.
The LNG cold energy cold accumulation power generation coupling system taking carbon dioxide as a refrigerant, wherein circulating water in the water circulating channel is seawater, and the first gasifier is an open frame type seawater gasifier.
The LNG cold energy cold accumulation power generation coupling system taking carbon dioxide as a refrigerant is characterized in that an LNG inlet in a carbon dioxide condenser is connected with an outlet of a high-pressure pump, and an inlet of the high-pressure pump is connected with an LNG storage tank.
The LNG cold energy cold accumulation power generation coupling system taking carbon dioxide as a refrigerant, wherein a liquid carbon dioxide outlet of the carbon dioxide cold accumulation liquid storage tank is connected with an inlet of a circulating pump, and an outlet of the circulating pump is connected with a liquid carbon dioxide inlet of a second gasifier.
The invention relates to an LNG cold energy cold accumulation power generation coupling system taking carbon dioxide as a refrigerant, wherein the third gasifier comprises a waste heat inlet and a waste heat outlet, and a heat exchange channel is arranged between the waste heat inlet and the waste heat outlet.
The LNG cold energy cold accumulation power generation coupling system taking carbon dioxide as a refrigerant, wherein waste heat in the heat exchange channel is one of production waste gas, domestic waste water or industrial waste water.
The invention relates to an LNG cold energy cold accumulation power generation coupling system taking carbon dioxide as a refrigerant, wherein power generation equipment comprises a turbine engine and a generator, a gaseous carbon dioxide outlet of a third gasifier is connected with an inlet of the turbine engine, an outlet of the turbine engine is connected with a gaseous carbon dioxide inlet of the second gasifier, and the turbine engine is connected with the generator.
According to another technical scheme, the LNG cold energy cold storage power generation coupling method using carbon dioxide as a refrigerant adopts an LNG cold energy cold storage power generation coupling system using carbon dioxide as a refrigerant, and comprises the following steps:
the LNG enters a carbon dioxide condenser to exchange heat with carbon dioxide, and the LNG discharged from the carbon dioxide condenser enters a first gasifier, exchanges heat with a water circulation channel in the first gasifier, turns into a gaseous state, and reaches the temperature required by a downstream gas user when entering a natural gas pipeline; carbon dioxide discharged from the carbon dioxide condenser is pressurized and then enters the third gasifier through the second gasifier, and enters the power generation equipment to generate power after heat exchange between the third gasifier and the heat exchange channel, and is discharged from the power generation equipment and then enters the carbon dioxide cold storage liquid storage tank through the second gasifier.
The invention relates to an LNG cold energy cold accumulation power generation coupling method taking carbon dioxide as a refrigerant, wherein the pressure of LNG entering a carbon dioxide condenser is 4.0MPa or 10.0MPa.
The LNG cold energy cold accumulation power generation coupling system and the LNG cold energy accumulation power generation coupling method using carbon dioxide as a refrigerant are different from the prior art in that the LNG cold energy accumulation power generation coupling system and the LNG cold energy accumulation power generation coupling method using carbon dioxide as the refrigerant realize the recycling of carbon dioxide, the problem of LNG cold energy fluctuation caused by the fluctuation of LNG gasification volume of a storage tank along with downstream gas consumption is solved by adopting the carbon dioxide cold accumulation liquid storage tank, the cold energy of LNG of a receiving station can be effectively utilized, the cold energy recycling efficiency of an LNG cold energy project can be improved, the economic efficiency of the cold energy project is improved, the environmental pollution problem of LNG cold energy direct emission is reduced, and the problem of low LNG cold energy recycling rate in the LNG receiving station in the prior art can be effectively solved.
The LNG cold energy cold accumulation power generation coupling system and the LNG cold energy cold accumulation power generation coupling method taking carbon dioxide as a refrigerant are further described below with reference to the accompanying drawings.
Drawings
FIG. 1 is a schematic diagram of an LNG cold energy cold accumulation power generation coupling system using carbon dioxide as a refrigerant;
the labels in the figures are: 1-LNG storage tanks; 2-high pressure pump; 3-a first gasifier; a 4-generator; 5-turbine engine; 6-a third gasifier; 7-a second gasifier; 8-a circulating pump; 9-a carbon dioxide cold accumulation liquid storage tank; 10-carbon dioxide condenser.
Detailed Description
The following examples are illustrative of the invention and are not intended to limit the scope of the invention.
Example 1
As shown in fig. 1, the LNG cold energy storage power generation coupling system using carbon dioxide as a refrigerant of the present invention includes an LNG cold energy storage subsystem and a power generation subsystem. The LNG cold energy cold accumulation subsystem and the power generation subsystem are connected through a carbon dioxide cold accumulation liquid storage tank 9.
The LNG cold energy cold accumulation subsystem comprises a carbon dioxide condenser 10 and a carbon dioxide cold accumulation liquid storage tank 9. The carbon dioxide condenser 10 includes two inlets and two outlets, an LNG inlet and a gaseous carbon dioxide inlet, an LNG outlet and a liquid carbon dioxide outlet, respectively. An LNG inlet in the carbon dioxide condenser 10 is connected with an outlet of the high-pressure pump 2, and an inlet of the high-pressure pump 2 is connected with the LNG storage tank 1; the LNG outlet is connected with the inlet of the first gasifier 3; the gaseous carbon dioxide inlet is connected with a gaseous carbon dioxide outlet of the carbon dioxide cold accumulation liquid storage tank 9; the liquid carbon dioxide outlet is connected with a liquid carbon dioxide inlet of the carbon dioxide cold accumulation liquid storage tank 9. The first vaporizer 3 is additionally connected with a water circulation passage. The circulating water in this embodiment is seawater and the first vaporizer 3 is an open rack seawater vaporizer (ORV).
Liquefied natural gas from the LNG storage tank 1 is pressurized to a certain pressure (4.0 MPa or 10.0 MPa) by a high-pressure pump 2 and then enters a carbon dioxide condenser 10; in the carbon dioxide condenser 10, LNG exchanges heat with carbon dioxide, cold energy released by absorbing low-temperature LNG by carbon dioxide is changed from a gaseous state to a liquid state, and the temperature of the low-temperature LNG is increased after absorbing heat of the gaseous carbon dioxide; the LNG coming out of the carbon dioxide condenser 10 enters the first gasifier 3, and after heat exchange is carried out on the LNG and the seawater entering the first gasifier 3, the LNG is gasified into natural gas and reaches the temperature required by a downstream gas user entering a natural gas pipeline for transmission; gaseous carbon dioxide with a certain pressure flows out from a gaseous carbon dioxide outlet in the carbon dioxide cold storage liquid storage tank 9, enters the carbon dioxide condenser 10, exchanges heat with low-temperature LNG in the carbon dioxide condenser 10, is converted into liquid carbon dioxide from the gaseous carbon dioxide, and is stored in the carbon dioxide cold storage liquid storage tank 9.
The LNG cold energy power generation subsystem comprises a carbon dioxide cold accumulation liquid storage tank 9. The carbon dioxide cold accumulation liquid storage tank 9 also comprises a gaseous carbon dioxide inlet and a liquid carbon dioxide outlet. The liquid carbon dioxide outlet of the carbon dioxide cold accumulation liquid storage tank 9 is connected with the inlet of the circulating pump 8, and the outlet of the circulating pump 8 is connected with the liquid carbon dioxide inlet of the second gasifier 7. The second gasifier 7 has two channels, the medium in which is carbon dioxide at different temperatures. Specifically, the second gasifier 7 includes a liquid carbon dioxide inlet, a liquid carbon dioxide outlet, a gaseous carbon dioxide inlet, and a gaseous carbon dioxide outlet. The liquid carbon dioxide outlet of the second gasifier 7 is connected to the liquid carbon dioxide inlet of the third gasifier 6. The gaseous carbon dioxide outlet of the second gasifier 7 is connected with the gaseous carbon dioxide inlet of the carbon dioxide cold accumulation liquid storage tank 9. The third gasifier 6 has two channels, one is a heat exchange channel, the medium in the channel is waste heat, the waste heat can be production waste gas, domestic waste water or industrial waste water, and the medium in the other channel is carbon dioxide. Specifically, the third gasifier 6 includes a waste heat inlet, a waste heat outlet, a liquid carbon dioxide inlet, and a gaseous carbon dioxide outlet. The gaseous carbon dioxide outlet of the third gasifier 6 is connected to the inlet of a power plant, which in this embodiment comprises a turbine engine 5 and a generator 4. The gaseous carbon dioxide outlet of the third gasifier 6 is connected to the inlet of the turbine engine 5, and the outlet of the turbine engine 5 is connected to the gaseous carbon dioxide inlet of the second gasifier 7. The turbine engine 5 is connected with the generator 4 and drives the generator 4 to generate electricity.
The liquid carbon dioxide in the carbon dioxide cold accumulation liquid storage tank 9 is sucked out by the circulating pump 8 and pressurized to a higher pressure, then enters the second gasifier 7, exchanges heat with the gaseous carbon dioxide with a certain temperature and pressure flowing out of the turbine engine 5 in the second gasifier 7, and absorbs heat from the liquid carbon dioxide pressurized by the circulating pump 8 to raise the temperature; the pressurized liquid carbon dioxide from the second gasifier 7 enters the third gasifier 6, after the heat of waste heat is absorbed in the third gasifier 6, gaseous carbon dioxide with higher pressure and temperature is formed, the gaseous carbon dioxide enters the turbine engine 5 to expand and do work to drive the generator 4 to generate electricity, and the gaseous carbon dioxide discharged from the turbine engine 5 still has certain pressure and temperature; gaseous carbon dioxide with certain temperature and pressure flowing out of the turbine engine 5 enters the second gasifier 7, heat exchange is carried out between the gaseous carbon dioxide and liquid carbon dioxide discharged by the circulating pump 8 in the second gasifier 7, and the gaseous carbon dioxide with reduced temperature enters the carbon dioxide cold storage liquid storage tank 9.
Example 2
The LNG cold energy storage power generation coupling method taking carbon dioxide as a refrigerant adopts the LNG cold energy storage power generation coupling system taking carbon dioxide as a refrigerant in the embodiment 1, and comprises the following steps:
liquefied natural gas from the LNG storage tank 1 is pressurized to a certain pressure (4.0 MPa or 10.0 MPa) by a high-pressure pump 2 and then enters a carbon dioxide condenser 10; in the carbon dioxide condenser 10, LNG exchanges heat with carbon dioxide, cold energy released by absorbing low-temperature LNG by carbon dioxide is changed from a gaseous state to a liquid state, and the temperature of the low-temperature LNG is increased after absorbing heat of the gaseous carbon dioxide; the LNG coming out of the carbon dioxide condenser 10 enters the first vaporizer 3, and the first vaporizer 3 may be an open rack seawater vaporizer (ORV) built in a receiving station, and after the LNG entering the first vaporizer 3 exchanges heat with the seawater entering the first vaporizer 3, the LNG is vaporized into natural gas and reaches a temperature required by a user who enters a natural gas pipeline and is delivered to downstream gas.
Wherein the method further comprises: gaseous carbon dioxide with a certain pressure flows out of the carbon dioxide cold storage liquid storage tank 9, enters the carbon dioxide condenser 10, exchanges heat with low-temperature LNG in the carbon dioxide condenser 10, is converted into liquid carbon dioxide from the gaseous carbon dioxide, and is stored in the carbon dioxide cold storage liquid storage tank 9.
Wherein the method further comprises: the liquid carbon dioxide in the carbon dioxide cold accumulation liquid storage tank 9 is sucked out by the circulating pump 8 and pressurized to a higher pressure, then enters the second gasifier 7, exchanges heat with the gaseous carbon dioxide with a certain temperature and pressure flowing out of the turbine engine 5 in the second gasifier 7, and absorbs heat from the liquid carbon dioxide pressurized by the circulating pump 8 to raise the temperature; the pressurized liquid carbon dioxide from the second gasifier 7 enters the third gasifier 6, after the heat of waste heat is absorbed in the third gasifier 6, gaseous carbon dioxide with higher pressure and temperature is formed, the gaseous carbon dioxide enters the turbine engine 5 to expand and do work to drive the generator 4 to generate electricity, and the gaseous carbon dioxide discharged from the turbine engine 5 still has certain pressure and temperature; gaseous carbon dioxide with certain temperature and pressure flowing out of the turbine engine 5 enters the second gasifier 7, heat exchange is carried out between the gaseous carbon dioxide and liquid carbon dioxide discharged by the circulating pump 8 in the second gasifier 7, and the gaseous carbon dioxide with reduced temperature enters the carbon dioxide cold storage liquid storage tank 9.
Therefore, the LNG cold energy cold storage power generation coupling system and the LNG cold energy cold storage power generation coupling method using the carbon dioxide as the refrigerant, provided by the invention, realize recycling of the carbon dioxide by using the carbon dioxide as the refrigerant, and solve the problem of LNG cold energy fluctuation caused by the fluctuation of LNG gasification amount of the storage tank along with the downstream gas consumption by adopting the carbon dioxide cold storage liquid storage tank. The problem that the LNG cold energy recovery rate is not high in an LNG receiving station in the prior art can be effectively solved.
While the invention has been described in detail in the foregoing general description and specific examples, it will be apparent to those skilled in the art that modifications and improvements can be made thereto. Accordingly, such modifications or improvements may be made without departing from the spirit of the invention and are intended to be within the scope of the invention as claimed.

Claims (8)

1. LNG cold energy cold accumulation power generation coupling system taking carbon dioxide as refrigerant is characterized in that: comprises an LNG cold energy cold storage subsystem and an LNG power generation subsystem which are connected through a carbon dioxide cold storage liquid storage tank,
the LNG cold energy cold accumulation subsystem comprises a carbon dioxide condenser and a carbon dioxide cold accumulation liquid storage tank, an LNG inlet in the carbon dioxide condenser is connected with an LNG source, an LNG outlet in the carbon dioxide condenser is connected with an inlet of a first gasifier, a gaseous carbon dioxide inlet in the carbon dioxide condenser is connected with a gaseous carbon dioxide outlet of the carbon dioxide cold accumulation liquid storage tank, a liquid carbon dioxide outlet in the carbon dioxide condenser is connected with a liquid carbon dioxide inlet of the carbon dioxide cold accumulation liquid storage tank, and the first gasifier is connected with a water circulation channel;
the LNG cold energy power generation subsystem also comprises the carbon dioxide cold accumulation liquid storage tank, a liquid carbon dioxide outlet of the carbon dioxide cold accumulation liquid storage tank is connected with a liquid carbon dioxide inlet of the second gasifier, a liquid carbon dioxide outlet of the second gasifier is connected with a liquid carbon dioxide inlet of the third gasifier, a gaseous carbon dioxide outlet of the second gasifier is connected with a gaseous carbon dioxide inlet of the carbon dioxide cold accumulation liquid storage tank, the third gasifier is connected with a heat exchange channel, a gaseous carbon dioxide outlet of the third gasifier is connected with an inlet of power generation equipment, and an outlet of the power generation equipment is connected with a gaseous carbon dioxide inlet of the second gasifier.
2. The LNG cold energy storage and power generation coupling system using carbon dioxide as a refrigerant according to claim 1, wherein: the circulating water in the water circulating channel is seawater, and the first gasifier is an open-frame seawater gasifier.
3. The LNG cold energy storage and power generation coupling system using carbon dioxide as a refrigerant according to claim 1, wherein: and an LNG inlet in the carbon dioxide condenser is connected with an outlet of the high-pressure pump, and an inlet of the high-pressure pump is connected with an LNG storage tank.
4. The LNG cold energy storage and power generation coupling system using carbon dioxide as a refrigerant according to claim 1, wherein: the liquid carbon dioxide outlet of the carbon dioxide cold accumulation liquid storage tank is connected with the inlet of the circulating pump, and the outlet of the circulating pump is connected with the liquid carbon dioxide inlet of the second gasifier.
5. The LNG cold energy storage and power generation coupling system using carbon dioxide as a refrigerant according to claim 1, wherein: the third gasifier comprises a waste heat inlet and a waste heat outlet, and a heat exchange channel is arranged between the waste heat inlet and the waste heat outlet.
6. The LNG cold energy storage and power generation coupling system using carbon dioxide as a refrigerant according to claim 5, wherein: waste heat in the heat exchange channel is one of production waste gas, domestic waste water or industrial waste water.
7. An LNG cold energy cold accumulation power generation coupling method taking carbon dioxide as a refrigerant is characterized by comprising the following steps of: use of the power generating coupling system of any of claims 1-6, comprising the steps of:
the LNG enters a carbon dioxide condenser to exchange heat with carbon dioxide, and the LNG discharged from the carbon dioxide condenser enters a first gasifier, exchanges heat with a water circulation channel in the first gasifier, turns into a gaseous state, and reaches the temperature required by a downstream gas user when entering a natural gas pipeline; carbon dioxide discharged from the carbon dioxide condenser is pressurized and then enters the third gasifier through the second gasifier, and enters the power generation equipment to generate power after heat exchange between the third gasifier and the heat exchange channel, and is discharged from the power generation equipment and then enters the carbon dioxide cold storage liquid storage tank through the second gasifier.
8. The LNG cold energy storage and power generation coupling method using carbon dioxide as a refrigerant according to claim 7, wherein: the pressure of the LNG entering the carbon dioxide condenser is 4.0MPa or 10.0MPa.
CN202310428042.4A 2023-04-20 2023-04-20 LNG cold energy cold accumulation power generation coupling system and method using carbon dioxide as refrigerant Pending CN116412010A (en)

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CN116412010A true CN116412010A (en) 2023-07-11

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