CN219754617U - LNG cold energy cold accumulation power generation coupling system taking carbon dioxide as refrigerant - Google Patents
LNG cold energy cold accumulation power generation coupling system taking carbon dioxide as refrigerant Download PDFInfo
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- CN219754617U CN219754617U CN202320898878.6U CN202320898878U CN219754617U CN 219754617 U CN219754617 U CN 219754617U CN 202320898878 U CN202320898878 U CN 202320898878U CN 219754617 U CN219754617 U CN 219754617U
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- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 title claims abstract description 369
- 239000001569 carbon dioxide Substances 0.000 title claims abstract description 185
- 229910002092 carbon dioxide Inorganic materials 0.000 title claims abstract description 185
- 238000010248 power generation Methods 0.000 title claims abstract description 47
- 238000009825 accumulation Methods 0.000 title claims abstract description 46
- 239000003507 refrigerant Substances 0.000 title claims abstract description 29
- 238000010168 coupling process Methods 0.000 title claims abstract description 27
- 230000008878 coupling Effects 0.000 title claims abstract description 26
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 26
- 239000007788 liquid Substances 0.000 claims abstract description 83
- 239000006200 vaporizer Substances 0.000 claims abstract description 24
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 9
- 239000002918 waste heat Substances 0.000 claims description 16
- 230000008676 import Effects 0.000 claims description 10
- 239000013535 sea water Substances 0.000 claims description 10
- 238000004146 energy storage Methods 0.000 claims description 9
- 238000004519 manufacturing process Methods 0.000 claims description 4
- 239000010840 domestic wastewater Substances 0.000 claims description 3
- 239000010842 industrial wastewater Substances 0.000 claims description 3
- 239000002912 waste gas Substances 0.000 claims description 3
- 238000003912 environmental pollution Methods 0.000 abstract description 3
- 239000003949 liquefied natural gas Substances 0.000 description 83
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 description 18
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 12
- 239000001294 propane Substances 0.000 description 9
- 239000003345 natural gas Substances 0.000 description 6
- 239000007789 gas Substances 0.000 description 5
- 238000002309 gasification Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 230000005611 electricity Effects 0.000 description 4
- 238000004064 recycling Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 235000011089 carbon dioxide Nutrition 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
The utility model discloses an LNG cold energy cold accumulation power generation coupling system taking carbon dioxide as a refrigerant, and relates to a system for utilizing LNG cold energy. The LNG cold energy cold accumulation power generation coupling system with the carbon dioxide as a refrigerant can solve the problem of LNG cold energy fluctuation, improve cold energy utilization efficiency and reduce environmental pollution. 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
Technical Field
The utility model relates to the technical field of LNG cold energy utilization, in particular to an LNG cold energy cold storage power generation coupling system taking 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 utility model aims to solve the technical problem of providing the LNG cold energy cold accumulation power generation coupling system which can solve the problem of LNG cold energy fluctuation, improve the cold energy utilization efficiency and reduce the environmental pollution and takes carbon dioxide as a refrigerant.
The utility model relates to an LNG cold energy cold storage power generation coupling system taking carbon dioxide as a refrigerant, which comprises an LNG cold energy cold storage subsystem and an LNG power generation subsystem which are connected through a carbon dioxide cold storage liquid 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;
LNG cold energy power generation subsystem also includes the carbon dioxide cold-storage liquid storage pot, the liquid carbon dioxide import of second vaporizer is connected to the liquid carbon dioxide exit linkage of carbon dioxide cold-storage liquid storage pot, the liquid carbon dioxide import of third vaporizer is connected to the liquid carbon dioxide exit linkage of second vaporizer, the gaseous carbon dioxide import of carbon dioxide cold-storage liquid storage pot is connected to the gaseous carbon dioxide exit linkage of second vaporizer, the third vaporizer is connected with the heat transfer passageway, the import of turbine engine is connected to the gaseous carbon dioxide exit linkage of third vaporizer, the gaseous carbon dioxide import of turbine engine exit linkage second vaporizer, turbine engine links to each other with the generator.
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 utility model 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 LNG cold energy cold accumulation power generation coupling system taking carbon dioxide as a refrigerant is different from the prior art in that the LNG cold energy cold accumulation power generation coupling system taking carbon dioxide as a refrigerant realizes the recycling of carbon dioxide, solves the problem of LNG cold energy fluctuation caused by the fluctuation of LNG gasification volume of a storage tank along with downstream gas consumption by adopting a carbon dioxide cold accumulation liquid storage tank, can effectively utilize the cold energy of LNG of a receiving station, can also improve the cold energy recycling efficiency of an LNG cold energy project, improve the economic efficiency of the cold energy project, reduce the environmental pollution problem of direct emission of LNG cold energy, and can effectively solve the problem of low LNG cold energy recycling rate in the LNG receiving station in the prior art.
The LNG cold energy cold accumulation power generation coupling system taking carbon dioxide as a refrigerant is 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 utility model and are not intended to limit the scope of the utility model.
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 utility model 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 taking the carbon dioxide as the refrigerant provided by the utility model takes the carbon dioxide as the refrigerant to realize the recycling of the carbon dioxide, and the carbon dioxide cold storage liquid storage tank is adopted to solve the problem that LNG cold energy fluctuation is caused by the fluctuation of LNG gasification amount of the storage tank along with the downstream gas consumption. 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 utility model 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 utility model and are intended to be within the scope of the utility model as claimed.
Claims (6)
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;
LNG cold energy power generation subsystem also includes the carbon dioxide cold-storage liquid storage pot, the liquid carbon dioxide import of second vaporizer is connected to the liquid carbon dioxide exit linkage of carbon dioxide cold-storage liquid storage pot, the liquid carbon dioxide import of third vaporizer is connected to the liquid carbon dioxide exit linkage of second vaporizer, the gaseous carbon dioxide import of carbon dioxide cold-storage liquid storage pot is connected to the gaseous carbon dioxide exit linkage of second vaporizer, the third vaporizer is connected with the heat transfer passageway, the import of turbine engine is connected to the gaseous carbon dioxide exit linkage of third vaporizer, the gaseous carbon dioxide import of turbine engine exit linkage second vaporizer, turbine engine links to each other with the generator.
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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320898878.6U CN219754617U (en) | 2023-04-20 | 2023-04-20 | LNG cold energy cold accumulation power generation coupling system taking carbon dioxide as refrigerant |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320898878.6U CN219754617U (en) | 2023-04-20 | 2023-04-20 | LNG cold energy cold accumulation power generation coupling system taking carbon dioxide as refrigerant |
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| CN219754617U true CN219754617U (en) | 2023-09-26 |
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| CN202320898878.6U Active CN219754617U (en) | 2023-04-20 | 2023-04-20 | LNG cold energy cold accumulation power generation coupling system taking carbon dioxide as refrigerant |
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| CN (1) | CN219754617U (en) |
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