CN113465201A - Cold-heat combined supply and energy storage system and method based on carbon dioxide compression coupling molten salt heat storage - Google Patents
Cold-heat combined supply and energy storage system and method based on carbon dioxide compression coupling molten salt heat storage Download PDFInfo
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- CN113465201A CN113465201A CN202110898634.3A CN202110898634A CN113465201A CN 113465201 A CN113465201 A CN 113465201A CN 202110898634 A CN202110898634 A CN 202110898634A CN 113465201 A CN113465201 A CN 113465201A
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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
- F25B9/00—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point
- F25B9/002—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point characterised by the refrigerant
- F25B9/008—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point characterised by the refrigerant the refrigerant being carbon dioxide
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- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D19/00—Details
- F24D19/0002—Means for connecting central heating radiators to circulation pipes
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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
- F25B39/00—Evaporators; Condensers
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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
- F25B41/00—Fluid-circulation arrangements
- F25B41/30—Expansion means; Dispositions thereof
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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
- F25B41/00—Fluid-circulation arrangements
- F25B41/40—Fluid line arrangements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D20/00—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D20/00—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00
- F28D2020/0004—Particular heat storage apparatus
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
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Abstract
The invention discloses a cold-heat combined supply and energy storage system and method based on carbon dioxide compression coupling molten salt heat storage, comprising a centralized heat supply unit, a centralized cold supply unit, an industrial steam supply unit, a molten salt heat storage unit, an energy release unit and an energy storage unit; the energy storage unit is connected with the heat supply unit through a fifth heat exchanger; the energy release unit is connected with the centralized cooling unit through a second heat exchanger and a third heat exchanger; the energy storage unit is connected with the energy release unit through a liquid carbon dioxide storage tank; the energy release unit is connected with the molten salt heat storage unit through a fourth heat exchanger; the centralized heat supply unit is connected with the molten salt heat storage unit through a sixth heat exchanger; the industrial steam supply unit is connected with the molten salt heat storage unit through the first heat exchanger. The system can effectively save coal resources, reduce environmental pollution, protect the environment, and simultaneously can meet the requirements of heating, centralized cooling, industrial steam supply and the like of residents.
Description
Technical Field
The invention belongs to the field of combined cooling and heating and energy storage, and relates to a combined cooling and heating and energy storage system and method based on carbon dioxide compression coupling molten salt heat storage.
Background
With the optimization adjustment and transformation of the electric power installation structure and the energy structure, the renewable energy sources such as wind, light, water and the like are rapidly developed and gradually become the main body of electric quantity, and the coal-electric unit can play the functions of power grid voltage stabilization, frequency modulation, bottom supporting and bottom protecting and the like. In addition, with the continuous development of the industry, the demands for concentrated heat and cold, production steam and the like are also greatly increased. The combined heat and power generation transformation considering the heat supply capacity and the operation flexibility and the rapid development of the low-energy-consumption long-distance heat supply technology are combined, the coal-fired and oil-fired heat supply boiler rooms which are heavy in pollution, high in energy consumption and distributed in large and medium-sized town areas are replaced by the coal-fired and oil-fired heat supply boiler units with high parameters and large capacity in a centralized heat supply mode, the heat supply reliability is improved, meanwhile, the heat energy consumption is greatly reduced, and the pollutant emission and the environment protection are favorably reduced.
However, in small and medium-sized urban areas with relatively small population size and industrial parks with small scale and quantity of enterprises, the peripheral high-capacity cogeneration units carry the heat over long distances to meet the requirements of concentrated heat for life, concentrated steam for production and the like, and the defects of large construction investment of long-distance transmission pipe networks, great increase of heat consumption cost and the like exist. However, in the three north area, renewable resources such as wind energy and light energy are abundant but cannot be absorbed on the spot, and the phenomena of wind abandonment and light abandonment are serious; meanwhile, due to the influence of factors such as geography, agricultural industry and structure, the heat consumption of urban residents is mainly given by scattered coal. There is a need to develop a technology capable of consuming local new energy power for various forms of energy supply such as residential heating, centralized cooling, industrial steam supply and the like.
Disclosure of Invention
The invention aims to solve the problems in the prior art and provides a cold-heat cogeneration and energy storage system and method based on carbon dioxide compression coupling molten salt heat storage. Particularly, the carbon dioxide is used as a compression expansion circulating medium and is coupled with a molten salt heat storage system, the wind energy, the solar energy and other new energy electric power are utilized to centrally supply heat and cool to urban areas and industrial parks, the energy storage function is achieved, and the high-proportion consumption of the new energy electric power is improved under the condition of zero carbon emission.
In order to achieve the purpose, the invention adopts the following technical scheme to realize the purpose:
cold and hot confession and energy storage system jointly based on carbon dioxide compression coupling fused salt heat-retaining includes: the system comprises a centralized heat supply unit, a centralized cold supply unit, an industrial steam supply unit, a molten salt heat storage unit, an energy release unit and an energy storage unit;
the energy storage unit is connected with the heat supply unit through a fifth heat exchanger; the energy release unit is connected with the centralized cooling unit through a second heat exchanger and a third heat exchanger; the energy storage unit is connected with the energy release unit through a liquid carbon dioxide storage tank; the energy release unit is connected with the molten salt heat storage unit through a fourth heat exchanger; the centralized heat supply unit is connected with the molten salt heat storage unit through a sixth heat exchanger; the industrial steam supply unit is connected with the molten salt heat storage unit through the first heat exchanger.
The invention is further improved in that:
the energy storage unit comprises a carbon dioxide storage tank, an electrically-driven compressor, a fifth heat exchanger, a refrigeration expander and a liquid carbon dioxide storage tank; and carbon dioxide in the carbon dioxide storage tank sequentially flows through the electrically-driven compressor, the fifth heat exchanger, the refrigeration expander and the liquid carbon dioxide storage tank.
The energy release unit comprises a second low-temperature booster pump, a first low-temperature booster pump, a second heat exchanger, a third heat exchanger, a fourth heat exchanger and a carbon dioxide turbine generator.
The energy storage unit is connected with the energy release unit through a liquid carbon dioxide storage tank; one path of carbon dioxide of the liquid carbon dioxide storage tank sequentially flows through the second low-temperature booster pump, the third heat exchanger, the fourth heat exchanger, the carbon dioxide turbine generator and the carbon dioxide storage tank; the other path of the gas flows through the first low-temperature booster pump, the second heat exchanger and the carbon dioxide storage tank in sequence.
The centralized heating unit comprises a heating plant, a heat supply network circulating water pump and a sixth heat exchanger; the heat supply circulating water of the heat supply station is divided into two paths after passing through the heat supply network circulating water pump, and one path of the heat supply circulating water sequentially flows through the sixth heat exchanger and the heat supply station; the other path of the heat flows through a fifth heat exchanger and a heat supply station in sequence.
The centralized cooling unit comprises a cooling station, a circulating pump, a second heat exchanger and a third heat exchanger; the cooling medium of the cooling station is divided into two paths after passing through the circulating pump, one path of the cooling medium flows through the second heat exchanger, the other path of the cooling medium flows through the third heat exchanger, and the two paths of the cooling medium are connected with the cooling station together.
The industrial steam supply unit comprises a desalting water tank, a booster water pump and a first heat exchanger; the demineralized water of the demineralized water tank flows through the booster water pump and the first heat exchanger in sequence, and the first heat exchanger heats and vaporizes the demineralized water in the demineralized water tank.
The molten salt heat storage unit comprises a low-temperature molten salt pump, a low-temperature molten salt storage tank, a seventh heat exchanger and a high-temperature molten salt storage tank; and the low-temperature molten salt of the low-temperature molten salt storage tank sequentially flows through the seventh heat exchanger and the high-temperature molten salt storage tank through the low-temperature molten salt pump.
The new energy electric power consumption unit is connected with the energy storage unit through the electrically-driven compressor; the new energy power absorption unit is connected with the molten salt heat storage unit through a seventh heat exchanger; the new energy electric power consumption unit comprises a wind power plant, a photovoltaic power station, a transformer, a seventh heat exchanger and an electric drive compressor; the electricity of the wind power plant and the photovoltaic power plant is supplied to the seventh heat exchanger and the electrically driven compressor through the transformer respectively.
The energy release unit is connected with the high-temperature molten salt storage tank and the low-temperature molten salt storage tank of the molten salt heat storage unit through the fourth heat exchanger; the centralized heat supply unit is connected with the high-temperature molten salt storage tank and the low-temperature molten salt storage tank of the molten salt heat storage unit through a sixth heat exchanger; the industrial steam supply unit is connected with the high-temperature molten salt storage tank and the low-temperature molten salt storage tank of the molten salt heat storage unit through the first heat exchanger.
A cold-heat combined supply and energy storage method based on carbon dioxide compression coupling molten salt heat storage comprises the following steps:
the new energy electric power consumption process: electricity of the wind power plant and the photovoltaic power plant is respectively supplied to the seventh heat exchanger and the electrically driven compressor through the transformer;
the molten salt heat storage process: the low-temperature molten salt at the outlet of the low-temperature molten salt storage tank is driven by a low-temperature molten salt pump, enters a seventh heat exchanger, is heated by electric energy, and enters a high-temperature molten salt storage tank for storage after being heated;
energy storage process: the carbon dioxide in the carbon dioxide storage tank enters an electrically-driven compressor to realize boosting and heating, enters a fifth heat exchanger in a high-pressure and high-temperature state, transfers heat energy to low-temperature heat supply network circulating water pressurized by a heat supply network circulating water pump at an outlet of a heat supply station, enters a refrigeration expansion machine in a high-pressure and normal-temperature state to be decompressed and liquefied, and enters a liquid carbon dioxide storage tank;
the energy release process is as follows: one path of carbon dioxide in the liquid carbon dioxide storage tank is boosted by the second low-temperature booster pump and then enters the third heat exchanger to transfer cold energy to the cold supply station; then absorbing the heat of the high-temperature molten salt at the outlet of the high-temperature molten salt storage tank at the fourth heat exchanger, and entering a carbon dioxide turbine generator in a high-pressure and high-temperature state to do work and generate power after the temperature is raised; the other path of cold energy enters a third heat exchanger after being boosted by a second low-temperature booster pump and is transmitted to a cold supply station; the outlet of the second heat exchanger is mixed with the outlet of the carbon dioxide turbine generator and jointly enters a carbon dioxide storage tank; the high-temperature molten salt at the outlet of the high-temperature molten salt storage tank at the stage is pressurized by a high-temperature molten salt pump, enters a fourth heat exchanger to release heat, and then returns to the low-temperature molten salt storage tank to be stored;
the centralized heating process: the outlet heat supply circulating water of the heat supply station is pressurized by a heat network circulating water pump and then divided into two paths, one path of the heat supply circulating water enters a sixth heat exchanger to absorb heat and then returns to the heat supply station, and the heat source is high-temperature molten salt at the outlet of a high-temperature molten salt storage tank; the other path of the heat is fed into a fifth heat exchanger to absorb heat and then returns to the heat supply station, and the heat source is high-pressure high-temperature carbon dioxide at the outlet of the electrically-driven compressor; the high-temperature molten salt at the outlet of the high-temperature molten salt storage tank at the stage is pressurized by a high-temperature molten salt pump, enters a sixth heat exchanger, releases heat and returns to the low-temperature molten salt storage tank for storage;
a centralized cooling process: the cold supply medium at the outlet of the cold supply station is boosted by the circulating pump and then divided into two paths, and one path enters the second heat exchanger to absorb cold energy and return to the cold supply station after being cooled; the other path enters a third heat exchanger to absorb cold energy and return to a cold supply station after being cooled; in the stage, the carbon dioxide at the outlet of the first low-temperature booster pump releases cold energy in the second heat exchanger, and enters the carbon dioxide storage tank for storage in a supercritical gas state; the carbon dioxide at the outlet of the second low-temperature booster pump is heated by high-temperature molten salt and then enters a carbon dioxide turbine generator in a high-temperature and high-pressure state to generate power;
industrial steam supply process: the desalted water at the outlet of the desalted water tank enters a booster water pump to be pressurized and enters a first heat exchanger to be heated and vaporized; and the high-temperature molten salt at the outlet of the high-temperature molten salt storage tank at the stage enters the sixth heat exchanger after being pressurized by the high-temperature molten salt pump, and returns to the low-temperature molten salt storage tank for storage after releasing heat.
Compared with the prior art, the invention has the following beneficial effects:
the invention provides a cold-heat combined supply and energy storage system and method based on carbon dioxide compression coupling molten salt heat storage, which constructs a compression heating and expansion refrigerating system taking carbon dioxide as a medium and wind energy and solar power as driving sources, is coupled with a molten salt heat storage system taking wind-solar power as a driving source, and has the functions of centralized heat supply, steam supply and cold supply for urban areas and industrial parks, and energy storage and power generation. The system can effectively save coal resources, reduce environmental pollution, protect the environment, and simultaneously can meet the requirements of heating, centralized cooling, industrial steam supply and the like of residents.
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 embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a schematic diagram of an embodiment of a co-generation and energy storage system based on carbon dioxide compression coupling molten salt heat storage.
Wherein: 1-a wind power plant, 2-a photovoltaic power plant, 3-a transformer, 4-an electrically driven compressor, 5-a fifth heat exchanger, 6-a heat supply station, 7-a heat supply network circulating water pump, 8-a refrigeration expander, 9-a liquid carbon dioxide storage tank, 10-a first low-temperature booster pump, 11-a second heat exchanger, 12-a circulating pump, 13-a cooling station, 14-a carbon dioxide storage tank, 15-a second low-temperature booster pump, 16-a third heat exchanger, 17-a fourth heat exchanger, 18-a carbon dioxide turbine generator, 19-a high-temperature molten salt storage tank, 20-a high-temperature molten salt pump, 21-a low-temperature molten salt storage tank, 22-a low-temperature molten salt pump, 23-a demineralized water tank, 24-a booster water pump, 25-a first heat exchanger, 26-a sixth heat exchanger, 27-seventh heat exchanger, 28-nineteenth valve group, 29-eighteenth valve group, 30-fifth valve group, 31-eighth valve group, 32-third valve group, 33-sixth valve group, 34-seventh valve group, 35-fourth valve group, 36-ninth valve group, 37-tenth valve group, 38-eleventh valve group, 39-twelfth valve group, 40-thirteenth valve group, 41-fourteenth valve group, 42-fifteenth valve group, 43-sixteenth valve group, 44-seventeenth valve group, 45-second valve group, 46-first valve group.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the embodiments of the present invention, it should be noted that if the terms "upper", "lower", "horizontal", "inner", etc. are used for indicating the orientation or positional relationship based on the orientation or positional relationship shown in the drawings or the orientation or positional relationship which is usually arranged when the product of the present invention is used, the description is merely for convenience and simplicity, and the indication or suggestion that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, cannot be understood as limiting the present invention. Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.
Furthermore, the term "horizontal", if present, does not mean that the component is required to be absolutely horizontal, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the embodiments of the present invention, it should be further noted that unless otherwise explicitly stated or limited, the terms "disposed," "mounted," "connected," and "connected" should be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The invention is described in further detail below with reference to the accompanying drawings:
referring to fig. 1, the invention discloses a cold-heat co-generation and energy storage system based on carbon dioxide compression coupling molten salt heat storage, which specifically comprises:
the electric energy generated by the wind power plant 1 and the photovoltaic power plant 2 drives the electrically-driven carbon dioxide compressor 4 and the seventh heat exchanger 27 through the transformer 3.
Carbon dioxide from the outlet of the carbon dioxide storage tank 14 enters the electrically-driven compressor 4 to realize pressure rise and temperature rise in the states of supercritical pressure (7.3MPa +0.2MPa) and normal temperature (31 ℃ plus 2 ℃), enters the fifth heat exchanger 5 in a high-pressure high-temperature state, transfers heat energy to low-temperature heat supply network circulating water pressurized by the heat supply network circulating water pump 7 at the outlet of the heat supply station 6, enters the refrigeration expander 8 in a high-pressure normal-temperature state to be depressurized and liquefied, and enters the liquid carbon dioxide storage tank 9.
The outlet circulating water of the heat supply station 6 is pressurized by a heat supply network circulating water pump 7 and then divided into two paths, one path enters a sixth heat exchanger 26 through a fifth valve group 30 to absorb heat and then returns to the heat supply station 6 through a nineteenth valve group 28, and the heat source is high-temperature molten salt at the outlet of a high-temperature molten salt storage tank 19; the other path enters the fifth heat exchanger 5 through an eighth valve group 31 to absorb heat and then returns to the heat supply station 6 through an eighteenth valve group 29, and the heat source is high-pressure high-temperature carbon dioxide at the outlet of the electrically driven compressor 4.
The outlet of the liquid carbon dioxide storage tank 9 is divided into two paths, wherein one path of the liquid carbon dioxide storage tank is boosted by a first low-temperature booster pump 10 and then enters a second heat exchanger 11 to transmit cold energy to a cold supply station 13; and the other path of the cold energy is boosted by a third valve group 32 and a second low-temperature booster pump 15 and then enters a third heat exchanger 16 to be transmitted to the cold supply station 13. The outlet of the second heat exchanger 11 and the outlet of the carbon dioxide turbine generator 18 are mixed and jointly enter the carbon dioxide storage tank 14. The carbon dioxide entering the carbon dioxide storage tank 14 is in a supercritical state, the pressure is more than or equal to 7.5MPa, and the temperature is more than or equal to 33 ℃.
The cold source of the cold supply station 13 has two paths, the cold supply medium at the outlet of the cold supply station 13 is boosted by the circulating pump 12 and then divided into two paths, and one path enters the second heat exchanger 11 to absorb cold energy and cool and then returns to the cold supply station 13; the other path enters the third heat exchanger 16 through a seventh valve group 34 to absorb cold energy and return to the cold supply station 13 after being cooled.
Industrial steam supply system: the desalted water from the desalted water tank 23 enters the booster water pump 24 through the sixteenth valve set 43, is pressurized, enters the first heat exchanger 25, is heated and vaporized, and is supplied out in a superheated steam state under certain pressure and temperature parameters.
After the liquid carbon dioxide at the outlet of the liquid carbon dioxide storage tank 9 is pressurized by the second low-temperature booster pump 15, the low-temperature cold energy is released by the third heat exchanger 16, the high-temperature molten salt heat at the outlet of the high-temperature molten salt storage tank 19 is absorbed by the fourth heat exchanger 17, and the heated liquid carbon dioxide enters the carbon dioxide turbine generator 18 in a high-pressure and high-temperature state to do work for power generation, so that the storage and release of new energy electric power such as wind, light and the like are realized. The carbon dioxide at the outlet of the carbon dioxide turbine generator 18 is in a supercritical state, the pressure is more than or equal to 7.5MPa, and the temperature is more than or equal to 33 ℃.
The specific working mode is as follows:
the molten salt heat storage process: the fifteenth valve group 42 and the seventeenth valve group 44 are opened, the low-temperature molten salt pump 22 operates, the low-temperature molten salt at the outlet of the low-temperature molten salt storage tank 21 is driven by the low-temperature molten salt pump 22, enters the seventh heat exchanger 27, is heated by the electric energy of the wind power plant 1 and the photovoltaic power plant 2, and enters the high-temperature molten salt storage tank 19 through the seventeenth valve group 44 after being heated for storage. And (5) emptying the low-temperature molten salt storage tank 21, and fully storing the high-temperature molten salt storage tank 19, and determining that the molten salt heat storage process is finished.
Energy storage process: the first valve set 46 is open and the second valve set 45 is closed. Carbon dioxide from the outlet of the carbon dioxide storage tank 14 enters the electrically-driven compressor 4 to realize pressure rise and temperature rise in the states of supercritical pressure (7.3MPa +0.2MPa) and normal temperature (31 ℃ plus 2 ℃), enters the fifth heat exchanger 5 in a high-pressure high-temperature state, transfers heat energy to low-temperature heat supply network circulating water pressurized by the heat supply network circulating water pump 7 at the outlet of the heat supply station 6, enters the refrigeration expander 8 in a high-pressure normal-temperature state to be depressurized and liquefied, and enters the liquid carbon dioxide storage tank 9. The electric energy of the wind power plant 1 and the electric energy of the photovoltaic power plant 2 are stored in the liquid carbon dioxide storage tank 9 by low-temperature liquid carbon dioxide except for transferring the compressed heat energy to the heating plant 6.
The energy release process is as follows: fourth valve set 35 and second valve set 45 are open. The outlet of the liquid carbon dioxide storage tank 9 enters the second low-temperature booster pump 15 through the second valve group 45 and the third valve group 32, after being boosted, the liquid carbon dioxide enters the third heat exchanger 16, and then the cold energy is transmitted to the cold supply station 13. And then the heat of the high-temperature molten salt at the outlet of the high-temperature molten salt storage tank 19 is absorbed by the fourth heat exchanger 17, and the high-temperature molten salt enters the carbon dioxide turbine generator 18 in a high-pressure and high-temperature state to do work for power generation after being heated, so that the storage and release of new energy power such as wind, light and the like are realized. A second cryogenic booster pump 15 and a fourth heat exchanger 17 regulate the pressure and problem, respectively, of the carbon dioxide at the inlet of the carbon dioxide turbo generator 18. The carbon dioxide at the outlet of the carbon dioxide turbine generator 18 is in a supercritical state, the pressure is more than or equal to 7.5MPa, and the temperature is more than or equal to 33 ℃. At this stage, the fifteenth valve group 42 and the fifteenth valve group 44 are closed, and the high-temperature molten salt at the outlet of the high-temperature molten salt storage tank 19 is pressurized by the high-temperature molten salt pump 20, enters the fourth heat exchanger 17 through the tenth valve group 37 to release heat, and then returns to the low-temperature molten salt storage tank 21 through the twelfth valve group 39 to be stored.
Centralized heat supply: the heat source has two paths, the outlet heat supply circulating water of the heat supply station 6 is pressurized by the heat supply network circulating water pump 7 and then divided into two paths, one path enters the sixth heat exchanger 26 through the fifth valve group 30 to absorb heat and then returns to the heat supply station 6 through the nineteenth valve group 28, and the heat source is high-temperature molten salt at the outlet of the high-temperature molten salt storage tank 19; the other path enters the fifth heat exchanger 5 through an eighth valve group 31 to absorb heat and then returns to the heat supply station 6 through an eighteenth valve group 29, and the heat source is high-pressure high-temperature carbon dioxide at the outlet of the electrically driven compressor 4. At this stage, the fifteenth valve group 42 and the seventeenth valve group 44 are closed, and the high-temperature molten salt at the outlet of the high-temperature molten salt storage tank 19 is pressurized by the high-temperature molten salt pump 20, enters the sixth heat exchanger 26 through the ninth valve group 36 to release heat, and then returns to the low-temperature molten salt storage tank 21 through the eleventh valve group 38 to be stored.
Centralized cooling: the cold source of the cold supply station 13 has two paths, the cold supply medium at the outlet of the cold supply station 13 is boosted by the circulating pump 12 and then divided into two paths, and one path enters the second heat exchanger 11 to absorb cold energy and cool and then returns to the cold supply station 13; the other path enters the third heat exchanger 16 through a seventh valve group 34 to absorb cold energy and return to the cold supply station 13 after being cooled. At this stage, the first cryo booster pump 10 and the second cryo booster pump 15 are both running, but the functions are not the same. The carbon dioxide at the outlet of the first low-temperature booster pump 10 releases cold energy in the second heat exchanger 11, and enters the carbon dioxide storage tank 14 in a supercritical gas state for storage; the outlet pressure of the second low-temperature booster pump 15 is higher than the supercritical state point more, and the second low-temperature booster pump enters the carbon dioxide turbine generator 18 to do work and generate power in a high-temperature and high-pressure state after being heated by high-temperature molten salt.
Industrial steam supply process: the desalted water from the desalted water tank 23 enters the booster water pump 24 through the sixteenth valve set 43, is pressurized, enters the first heat exchanger 25, is heated and vaporized, and is supplied out in a superheated steam state under certain pressure and temperature parameters. At this stage, the fifteenth valve group 42 and the seventeenth valve group 44 are closed, and the high-temperature molten salt at the outlet of the high-temperature molten salt storage tank 19 is pressurized by the high-temperature molten salt pump 20, enters the sixth heat exchanger 26 through the ninth valve group 36 to release heat, and then returns to the low-temperature molten salt storage tank 21 through the eleventh valve group 38 to be stored. The booster pump 24 adopts an electric frequency conversion configuration to adjust the industrial steam supply pressure at the outlet of the first heat exchanger 25 so as to meet the production requirements of user enterprises.
The invention provides a method for using carbon dioxide as a compression expansion cycle medium and coupling a molten salt heat storage system, which uses new energy electric power such as wind, light and the like to centrally supply heat and cool for urban areas and industrial parks, has an energy storage function, and improves the high-proportion consumption of the new energy electric power under the condition of zero carbon emission.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. Cold and hot confession and energy storage system jointly based on carbon dioxide compression coupling fused salt heat-retaining, its characterized in that includes: the system comprises a centralized heat supply unit, a centralized cold supply unit, an industrial steam supply unit, a molten salt heat storage unit, an energy release unit and an energy storage unit;
the energy storage unit is connected with the heat supply unit through a fifth heat exchanger (5); the energy release unit is connected with the centralized cooling unit through a second heat exchanger (11) and a third heat exchanger (16); the energy storage unit is connected with the energy release unit through a liquid carbon dioxide storage tank (9); the energy release unit is connected with the molten salt heat storage unit through a fourth heat exchanger (17); the centralized heat supply unit is connected with the molten salt heat storage unit through a sixth heat exchanger (26); the industrial steam supply unit is connected with the molten salt heat storage unit through a first heat exchanger (25).
2. The co-generation and energy-storage system based on carbon dioxide compression coupling molten salt heat storage according to claim 1, characterized in that the energy-storage unit comprises a carbon dioxide storage tank (14), an electrically-driven compressor (4), a fifth heat exchanger (5), a refrigeration expander (8) and a liquid carbon dioxide storage tank (9); and carbon dioxide in the carbon dioxide storage tank (14) sequentially flows through the electrically-driven compressor (4), the fifth heat exchanger (5), the refrigeration expander (8) and the liquid carbon dioxide storage tank (9).
3. The co-generation and energy-storage system based on carbon dioxide compression coupling molten salt heat storage according to claim 1, wherein the energy release unit comprises a second low-temperature booster pump (15), a first low-temperature booster pump (10), a second heat exchanger (11), a third heat exchanger (16), a fourth heat exchanger (17) and a carbon dioxide turbine generator (18);
the energy storage unit is connected with the energy release unit through a liquid carbon dioxide storage tank (9); one path of carbon dioxide in the liquid carbon dioxide storage tank (9) sequentially flows through a second low-temperature booster pump (15), a third heat exchanger (16), a fourth heat exchanger (17), a carbon dioxide turbine generator (18) and a carbon dioxide storage tank (14); the other path of the gas flows through a first low-temperature booster pump (10), a second heat exchanger (11) and a carbon dioxide storage tank (14) in sequence.
4. The co-generation and energy-storage system based on carbon dioxide compression coupling molten salt heat storage according to claim 1, wherein the central heating unit comprises a heating plant (6), a heat network circulating water pump (7) and a sixth heat exchanger (26); the heat supply circulating water of the heat supply station (6) is divided into two paths after passing through a heat supply network circulating water pump (7), and one path of the heat supply circulating water sequentially flows through a sixth heat exchanger (26) and the heat supply station (6); the other path of the heat flows through a fifth heat exchanger (5) and a heat supply station (6) in sequence.
5. The co-generation and energy-storage system based on carbon dioxide compression coupling molten salt heat storage according to claim 1, wherein the centralized cooling unit comprises a cooling station (13), a circulating pump (12), a second heat exchanger (11) and a third heat exchanger (16); the cooling medium of the cooling station (13) is divided into two paths after passing through the circulating pump (12), one path of the cooling medium flows through the second heat exchanger (11), the other path of the cooling medium flows through the third heat exchanger (16), and the two paths of the cooling medium are connected with the cooling station (13) together.
6. The co-generation and energy storage system based on carbon dioxide compression coupling molten salt heat storage according to claim 1, wherein the industrial steam supply unit comprises a desalted water tank (23), a booster water pump (24) and a first heat exchanger (25); the demineralized water in the demineralized water tank (23) flows through the booster water pump (24) and the first heat exchanger (25) in sequence, and the first heat exchanger (25) heats and vaporizes the demineralized water in the demineralized water tank (23).
7. The carbon dioxide compression coupling molten salt heat storage-based combined cooling and heating and energy storage system according to claim 1, wherein the molten salt heat storage unit comprises a low-temperature molten salt pump (22), a low-temperature molten salt storage tank (21), a seventh heat exchanger (27) and a high-temperature molten salt storage tank (19); and the low-temperature molten salt in the low-temperature molten salt storage tank (21) flows through a seventh heat exchanger (27) and the high-temperature molten salt storage tank (19) in sequence through a low-temperature molten salt pump (22).
8. The co-generation and energy storage system based on carbon dioxide compression coupling molten salt heat storage according to claim 1, further comprising a new energy power consumption unit; the new energy electric power consumption unit is connected with the energy storage unit through an electrically-driven compressor (4); the new energy power consumption unit is connected with the molten salt heat storage unit through a seventh heat exchanger (27); the new energy power consumption unit comprises a wind power plant (1), a photovoltaic power station (2), a transformer (3), a seventh heat exchanger (27) and an electric drive compressor (4); the electricity of the wind power plant (1) and the photovoltaic power plant (2) is respectively supplied to the seventh heat exchanger (27) and the electric drive compressor (4) through the transformer (3).
9. The carbon dioxide compression coupling molten salt heat storage-based combined cooling and heating and energy storage system according to claim 7, wherein the energy release unit is connected with a high-temperature molten salt storage tank (19) and a low-temperature molten salt storage tank (21) of the molten salt heat storage unit through a fourth heat exchanger (17); the centralized heat supply unit is connected with a high-temperature molten salt storage tank (19) and a low-temperature molten salt storage tank (21) of the molten salt heat storage unit through a sixth heat exchanger (26); the industrial steam supply unit is connected with a high-temperature molten salt storage tank (19) and a low-temperature molten salt storage tank (21) of the molten salt heat storage unit through a first heat exchanger (25).
10. A cold and heat cogeneration and energy storage method based on carbon dioxide compression coupling molten salt heat storage by adopting the system of any one of claims 1 to 9, which is characterized by comprising the following steps:
the new energy electric power consumption process: the electricity of the wind power plant (1) and the photovoltaic power plant (2) is respectively supplied to a seventh heat exchanger (27) and an electrically driven compressor (4) through a transformer (3);
the molten salt heat storage process: the low-temperature molten salt at the outlet of the low-temperature molten salt storage tank (21) is driven by a low-temperature molten salt pump (22), enters a seventh heat exchanger (21), is heated by electric energy, and enters a high-temperature molten salt storage tank (19) for storage after being heated;
energy storage process: carbon dioxide in a carbon dioxide storage tank (14) enters an electrically-driven compressor (4) to realize pressure rise and temperature rise, enters a fifth heat exchanger (5) in a high-pressure high-temperature state, transfers heat energy to low-temperature heat supply network circulating water pressurized by a heat supply network circulating water pump (7) at an outlet of a heat supply station (6), enters a refrigeration expander (8) in a high-pressure normal-temperature state to be depressurized and liquefied, and enters a liquid carbon dioxide storage tank (9);
the energy release process is as follows: one path of carbon dioxide in the liquid carbon dioxide storage tank (9) enters a third heat exchanger (16) after being boosted by a second low-temperature booster pump (15) and then is transmitted to a cold supply station (13); then absorbing the heat of the high-temperature molten salt at the outlet of the high-temperature molten salt storage tank (19) in the fourth heat exchanger (17), and entering a carbon dioxide turbine generator (18) in a high-pressure and high-temperature state to do work and generate power after the temperature is increased; the other path of the cold energy enters a third heat exchanger (16) after being boosted by a second low-temperature booster pump (15) and is transmitted to a cold supply station (13); the outlet of the second heat exchanger (11) is mixed with the outlet of the carbon dioxide turbine generator (18) and jointly enters the carbon dioxide storage tank (14); the high-temperature molten salt at the outlet of the high-temperature molten salt storage tank (19) at the stage is pressurized by a high-temperature molten salt pump (20), enters a fourth heat exchanger (17) to release heat, and then returns to the low-temperature molten salt storage tank (21) to be stored;
the centralized heating process: the outlet heat supply circulating water of the heat supply station (6) is pressurized by a heat supply network circulating water pump (7) and then divided into two paths, one path of the circulating water enters a sixth heat exchanger (26) to absorb heat and then returns to the heat supply station (6), and the heat source is high-temperature molten salt at the outlet of a high-temperature molten salt storage tank (19); the other path of the heat is fed into a fifth heat exchanger (5) to absorb heat and then returns to a heat supply station (6), and a heat source is high-pressure high-temperature carbon dioxide at the outlet of the electrically driven compressor (4); the high-temperature molten salt at the outlet of the high-temperature molten salt storage tank (19) at the stage is pressurized by a high-temperature molten salt pump (20), enters a sixth heat exchanger (26) to release heat, and then returns to the low-temperature molten salt storage tank (21) for storage;
a centralized cooling process: the cold supply medium at the outlet of the cold supply station (13) is pressurized by the circulating pump (12) and then divided into two paths, one path enters the second heat exchanger (11) to absorb cold energy and cool, and then returns to the cold supply station (13); the other path of the cold energy enters a third heat exchanger (16) to absorb the cold energy and return to a cold supply station (13) after being cooled; at the stage, the carbon dioxide at the outlet of the first low-temperature booster pump (10) releases cold energy in the second heat exchanger (11) and enters a carbon dioxide storage tank (14) for storage in a supercritical gas state; the carbon dioxide at the outlet of the second low-temperature booster pump (15) is heated by high-temperature molten salt and then enters a carbon dioxide turbine generator (18) in a high-temperature and high-pressure state to generate power;
industrial steam supply process: the desalted water at the outlet of the desalted water tank (23) enters a booster water pump (24) to be pressurized and enters a first heat exchanger (25) to be heated and vaporized; the high-temperature molten salt at the outlet of the high-temperature molten salt storage tank (19) at the stage enters a sixth heat exchanger (26) after being pressurized by a high-temperature molten salt pump (20), and returns to the low-temperature molten salt storage tank (21) for storage after releasing heat.
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