Park-level energy storage and heat release adjusting system and use method thereof

Abstract

The park-level energy storage and heat release adjusting system comprises a heat storage and heat release assembly and a cold storage assembly which are connected with a park, and the heat storage and heat release assembly comprises a first-level heat storage and heat release part, a second-level heat storage and heat release part and a third-level heat storage and heat release part which are sequentially connected; the first-stage heat storage and release part comprises a ground source heat heater, a first heat exchanger and a cold and hot water storage tank; the second-stage heat storage and release part comprises a solar heater, a second heat exchanger and a cold and hot conduction oil storage tank; the third-stage heat storage and release part comprises an electric heater, a direct injection heat exchanger and a cold and hot fused salt storage tank, the output of the direct injection heat exchanger is connected with a carbon dioxide gas storage tank, and the carbon dioxide gas storage tank is connected with the cold storage assembly. Carbon dioxide circulation of an underground field is established by utilizing the energy storage property of carbon dioxide in a liquid state and a gas state, a park-level cross-seasonal energy storage and heat release system is built, and the purposes of storing heat in summer and taking heat in winter and storing cold in winter and taking cold in summer are achieved.

Description

Technical Field

[0001] The present invention belongs to the technical field of compressed gas energy storage, and in particular relates to a park-level energy storage and heat release adjustment system. Background Art

[0002] Achieving the goals of carbon peak and carbon neutrality is not only a major policy for my country in the face of the severe situation of global climate warming, but also an inevitable need for my country as it is in the stage of transformation and upgrading of its economic structure and achieving sustainable development of the economic environment.

[0003] Interseasonal energy storage refers to the use of excess heat collected in summer or transitional seasons to compensate for insufficient winter heating, and the use of excess cold collected in winter or transitional seasons to provide cooling in summer, also known as long-term energy storage. Interseasonal energy storage can utilize and store low-grade heat, eliminating some of the need to generate new heat, thereby reducing total energy consumption; currently underground energy storage technology has become the most commonly used seasonal energy storage technology due to its large capacity, low environmental impact, ability to efficiently store renewable energy, and high technical maturity.

[0004] The current inter-seasonal energy storage systems’ energy storage media mainly include hot water storage, aquifer storage, gravel-water storage, and buried pipe storage. These energy storage media can only be used to store heat in summer and fail to make reasonable use of the cold in winter. At the same time, the current energy storage system does not make full use of clean energy, which is not conducive to achieving the carbon neutrality goal. How to use carbon dioxide in liquid and gaseous states to store energy and achieve inter-seasonal energy storage is an important task at this stage.

[0005] Therefore, a rationally designed park-level energy storage and heat release adjustment system is needed, which utilizes the energy storage properties of carbon dioxide in liquid and gaseous states, establishes an underground carbon dioxide circulation, and creates a park-level cross-seasonal energy storage and heat release system to achieve the purpose of storing heat in summer and extracting heat in winter, and storing cold in winter and extracting cold in summer. Summary of the invention

[0006] The technical problem to be solved by the present invention is to provide a park-level energy storage and heat release adjustment system in view of the deficiencies in the above-mentioned prior art. The system has a reasonable design and utilizes the energy storage properties of carbon dioxide in liquid and gaseous states to establish an underground carbon dioxide circulation, thereby creating a park-level cross-seasonal energy storage and heat release system, thereby achieving the purpose of storing heat in summer and taking heat in winter, storing cold in winter and taking cold in summer.

[0007] In order to solve the above technical problems, the technical solution adopted by the present invention is: a park-level energy storage heat release adjustment system, characterized in that: it includes a heat storage heat release component and a cold storage component connected to the park, the heat storage heat release component includes a first-stage heat storage heat release component, a second-stage heat storage heat release component and a third-stage heat storage heat release component connected in sequence, the first-stage heat storage heat release component includes a geothermal heater connected to the park outlet, a first heat exchanger connected to the output of the geothermal heater and a hot and cold water storage tank connected to the first heat exchanger;

[0008] The second stage heat storage and release component includes a solar heater connected to the first heat exchanger, a second heat exchanger connected to the outlet of the solar heater, and a cold and hot thermal oil storage tank connected to the second heat exchanger;

[0009] The third-stage heat storage and heat release component includes an electric heater connected to the second heat exchanger, a direct injection heat exchanger connected to the electric heater, and a cold and hot molten salt storage tank connected to the direct injection heat exchanger. The output of the direct injection heat exchanger is connected to a carbon dioxide gas storage tank, and the carbon dioxide gas storage tank is connected to the cold storage component.

[0010] The above-mentioned park-level energy storage and heat release adjustment system is characterized in that: the cold and hot water storage tank is provided with a first fluid booster pump, and the output of the first fluid booster pump is connected to the park through a hot water pipeline;

[0011] The cold and hot thermal oil storage tanks are provided with a thermal oil pump, the output of which is connected to the park through an oil pipeline, and the solar panel connected to the solar heater is arranged on the ground;

[0012] The cold and hot molten salt storage tanks are provided with a first molten salt pump, and the output of the first molten salt pump is connected to the park through a molten salt pipeline.

[0013] The above-mentioned park-level energy storage and heat release adjustment system is characterized in that: the direct injection heat exchanger includes a box body, a carbon dioxide pipeline arranged on the box body and connected to the outlet of the electric heater and a plurality of injection branches connected to the carbon dioxide pipeline and extending into the box body, and a molten salt pipeline running through the box body, the inlet and outlet of the molten salt pipeline extend out of the box body, the cold warehouse outlet of the cold and hot molten salt storage tanks is provided with a second molten salt pump, the inlet of the molten salt pipeline is connected to the outlet of the second molten salt pump, and the outlet of the molten salt pipeline is connected to the hot warehouse of the cold and hot molten salt storage tanks.

[0014] The above-mentioned park-level energy storage and heat release adjustment system is characterized in that: the box is connected to a carbon dioxide outlet pipe and a clean gas pipeline, and the carbon dioxide outlet pipe is connected to a carbon dioxide gas storage tank;

[0015] The bottom of the injection branch pipe is close to the molten salt pipeline, and a nozzle is arranged at the bottom of the injection branch pipe.

[0016] The above-mentioned park-level energy storage and heat release adjustment system is characterized in that: the cold storage component includes a refrigeration heat exchanger, a compressor, a ground source condenser, a throttle valve and a carbon dioxide storage tank connected in sequence, the carbon dioxide storage tank is connected to the park through a carbon dioxide pipeline, the air inlet of the refrigeration heat exchanger is connected to the carbon dioxide gas storage tank, the hot compartment of the cold and hot thermal oil storage tank is connected to the liquid inlet of the refrigeration heat exchanger through a delivery booster pump, the air outlet of the refrigeration heat exchanger is connected to the compressor, the liquid outlet of the refrigeration heat exchanger is connected to the cold compartment of the cold and hot thermal oil storage tank, the outlet of the compressor is connected to the air inlet of the ground source condenser, the air outlet of the ground source condenser is connected to the inlet of the throttle valve, and the outlet of the throttle valve is connected to the carbon dioxide storage tank.

[0017] At the same time, a method for using the park-level energy storage heat release adjustment system is provided, characterized in that the method comprises the following steps:

[0018] First-stage energy storage and heat release: operate the geothermal heater, which performs the first-stage heating on the carbon dioxide released by the summer cooling at the park outlet to obtain the first-stage heated carbon dioxide gas; wherein the temperature of the first-stage heated carbon dioxide gas does not exceed 100°C;

[0019] The carbon dioxide gas heated in the first stage is input through the air inlet of the first heat exchanger, and the cold water in the cold compartment of the cold and hot water storage tank is input through the liquid inlet of the first heat exchanger. The carbon dioxide gas heated in the first stage heats the cold water to form hot water and is output through the liquid outlet of the first heat exchanger to enter the hot compartment of the cold and hot water storage tank. The hot water in the hot compartment is transported to the park through the hot water pipeline for winter hot water supply and winter heating under the action of the first fluid booster pump, and the carbon dioxide gas after the first stage of heat release is obtained through the air outlet of the first heat exchanger.

[0020] Second stage energy storage and heat release: The solar panel is used to make the solar heater work, and the carbon dioxide gas after the first stage heat release is heated by the solar heater in the second stage to obtain the second stage heated carbon dioxide gas; wherein the temperature of the second stage heated carbon dioxide gas is 100°C to 300°C;

[0021] The carbon dioxide gas heated in the second stage is input through the air inlet of the second heat exchanger, and the cold and hot oil in the cold bin of the cold and hot thermal oil storage tank is input through the liquid inlet of the second heat exchanger. The carbon dioxide gas heated in the second stage heats the cold thermal oil to form hot thermal oil and is output through the liquid outlet of the second heat exchanger to enter the hot bin of the cold and hot thermal oil storage tank for storage. The hot thermal oil in the hot bin is transported to the winter heating of the park and the carbon dioxide heat source compensation through the oil pipeline under the action of the thermal oil pump, and the carbon dioxide gas after the second stage heat release is obtained through the air outlet of the second heat exchanger.

[0022] The third stage of energy storage and heat release: the electric heater is operated to work, and the carbon dioxide gas after the second stage of heat release is heated by the electric heater for the third stage to obtain the third stage heated carbon dioxide gas; wherein the temperature of the third stage heated carbon dioxide gas is greater than 300°C;

[0023] The carbon dioxide gas heated in the third stage is input through the air inlet of the direct injection heat exchanger, and the cold molten salt in the cold bin of the cold and hot molten salt storage tank is input through the inlet of the direct injection heat exchanger. The carbon dioxide gas heated in the third stage heats the cold molten salt to form hot molten salt and is output through the outlet of the direct injection heat exchanger to enter the hot bin of the cold and hot molten salt storage tank for storage. The hot molten salt in the hot bin is transported to the park for winter heating through the molten salt pipeline under the action of the first molten salt pump, and the carbon dioxide gas after the third stage heat release is obtained through the air outlet of the direct injection heat exchanger.

[0024] The carbon dioxide gas after the third stage heat release in winter passes through the refrigeration heat exchanger and the compressor to output high-temperature and high-pressure carbon dioxide gas. The high-temperature and high-pressure carbon dioxide gas is cooled by the ground source condenser and reduced in pressure through the throttle valve. It is self-condensed into liquid carbon dioxide and transported to the carbon dioxide storage tank for energy storage. The liquid carbon dioxide in the carbon dioxide storage tank is transported to the park through the carbon dioxide pipeline for summer cooling.

[0025] Compared with the prior art, the present invention has the following advantages:

[0026] 1. The present invention uses carbon dioxide as a park-level object to store and release energy. To ensure safety, except for the park, solar panels and necessary pipelines on the ground, the heat storage and release components and the cold storage components are all below 6m underground, realizing the establishment of carbon dioxide circulation in the underground field.

[0027] 2. In the present invention, in summer, the cold storage component supplies cold to the park, and the heat storage and heat release component recovers hot carbon dioxide from the park and stores heat using natural heat; in winter, the heat storage and heat release component supplies heat to the park, and the cold storage component condenses the carbon dioxide from the heat storage and heat release component into carbon dioxide liquid using natural cold and stores it.

[0028] 3. The present invention is provided with a first-stage heat storage and heat release component, a second-stage heat storage and heat release component and a third-stage heat storage and heat release component for selective step-by-step storage and release of heat, and heat of different temperatures is supplied to different use occasions. The cold storage component is used to store cold in winter and to provide cooling for the park in summer.

[0029] In summary, the present invention is reasonably designed, and utilizes the energy storage property of carbon dioxide in liquid and gaseous states to establish an underground carbon dioxide circulation, create a park-level cross-seasonal energy storage and heat release system, and achieve the purpose of storing heat in summer and taking heat in winter, and storing cold in winter and taking cold in summer.

[0030] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of the structure of the present invention.

[0032] Figure 2 It is a schematic diagram of the structure of the direct injection heat exchanger of the present invention.

[0033] Description of reference numerals:

[0034] 1—park; 2—solar panels; 3—ground source heat heater;

[0035] 4—first heat exchanger; 5—cold and hot water storage tank; 6—first fluid booster pump;

[0036] 7—solar heater; 8—second heat exchanger; 9—cold and hot thermal oil storage tanks;

[0037] 10—heat transfer oil pump; 11—transport booster pump; 12—electric heater;

[0038] 13—direct injection heat exchanger; 13-1—tank; 13-2—carbon dioxide pipeline;

[0039] 13-3—clean gas pipeline; 13-4—molten salt pipeline; 13-5—injection branch pipe;

[0040] 13-6—nozzle; 13-7—carbon dioxide outlet pipe; 14—cold and hot molten salt storage tanks;

[0041] 15—first molten salt pump; 16—carbon dioxide gas storage tank;

[0042] 17—refrigeration heat exchanger; 18—compressor; 19—ground source condenser;

[0043] 20—throttle valve; 21—carbon dioxide storage tank; 22—second molten salt pump. DETAILED DESCRIPTION

[0044] like Figure 1 and Figure 2 As shown, the present invention includes a heat storage and heat release component and a cold storage component connected to the park 1, the heat storage and heat release component includes a first-stage heat storage and heat release component, a second-stage heat storage and heat release component and a third-stage heat storage and heat release component connected in sequence, the first-stage heat storage and heat release component includes a geothermal heater 3 connected to the outlet of the park 1, a first heat exchanger 4 connected to the output of the geothermal heater 3 and a cold and hot water storage tank 5 connected to the first heat exchanger 4;

[0045] The second stage heat storage and release component includes a solar heater 7 connected to the first heat exchanger 4, a second heat exchanger 8 connected to the outlet of the solar heater 7, and a cold and hot thermal oil storage tank 9 connected to the second heat exchanger 8;

[0046] The third-stage heat storage and heat release component includes an electric heater 12 connected to the second heat exchanger 8, a direct injection heat exchanger 13 connected to the electric heater 12, and a cold and hot molten salt storage tank 14 connected to the direct injection heat exchanger 13. The output of the direct injection heat exchanger 13 is connected to a carbon dioxide gas storage tank 16, and the carbon dioxide gas storage tank 16 is connected to the cold storage component.

[0047] In this embodiment, the cold and hot water storage tank 5 is provided with a first fluid booster pump 6, and the output of the first fluid booster pump 6 is connected to the park 1 through a hot water pipeline;

[0048] The hot and cold thermal oil storage tanks 9 are provided with a thermal oil pump 10, the output of which is connected to the park 1 through an oil pipeline, and the solar panel 2 connected to the solar heater 7 is arranged on the ground;

[0049] The cold and hot molten salt storage tanks 14 are provided with a first molten salt pump 15 , and the output of the first molten salt pump 15 is connected to the park 1 through a molten salt pipeline.

[0050] In this embodiment, the direct injection heat exchanger 13 includes a box body 13-1, a carbon dioxide pipeline 13-2 arranged on the box body 13-1 and connected to the outlet of the electric heater 12, and a plurality of injection branches 13-5 connected to the carbon dioxide pipeline 13-2 and extending into the box body 13-1, and a molten salt pipeline 13-4 running through the box body 13-1, the inlet and outlet of the molten salt pipeline 13-4 extend out of the box body 13-1, and the cold storage outlet of the cold and hot molten salt storage tank 14 is provided with a second molten salt pump 22, the inlet of the molten salt pipeline 13-4 is connected to the outlet of the second molten salt pump 22, and the outlet of the molten salt pipeline 13-4 is connected to the hot storage of the cold and hot molten salt storage tank 14.

[0051] In this embodiment, the box 13-1 is connected to a carbon dioxide outlet pipe 13-7 and a clean gas pipeline 13-3, and the carbon dioxide outlet pipe 13-7 is connected to a carbon dioxide gas storage tank 16;

[0052] The bottom of the injection branch pipe 13-5 is close to the molten salt pipeline 13-4, and a nozzle 13-6 is provided at the bottom of the injection branch pipe 13-5.

[0053] In this embodiment, the cold storage component includes a refrigeration heat exchanger 17, a compressor 18, a ground source condenser 19, a throttle valve 20 and a carbon dioxide storage tank 21 connected in sequence. The carbon dioxide storage tank 21 is connected to the park 1 through a carbon dioxide pipeline, the air inlet of the refrigeration heat exchanger 17 is connected to the carbon dioxide gas storage tank 16, the hot compartment of the cold and hot thermal oil storage tank 9 is connected to the liquid inlet of the refrigeration heat exchanger 17 through a delivery booster pump 11, the air outlet of the refrigeration heat exchanger 17 is connected to the compressor 18, the liquid outlet of the refrigeration heat exchanger 17 is connected to the cold compartment of the cold and hot thermal oil storage tank 9, the outlet of the compressor 18 is connected to the air inlet of the ground source condenser 19, the air outlet of the ground source condenser 19 is connected to the inlet of the throttle valve 20, and the outlet of the throttle valve 20 is connected to the carbon dioxide storage tank 21.

[0054] In this embodiment, carbon dioxide gas and carbon dioxide liquid are used as heat storage and cold storage media during specific implementation.

[0055] In this embodiment, during specific implementation, at least one valve and a plurality of pipeline connections may be provided in the heat storage and heat release component and the cold storage component.

[0056] In this embodiment, during specific implementation, a first-stage heat storage and heat release component, a second-stage heat storage and heat release component, and a third-stage heat storage and heat release component are provided for selective step-by-step storage and release of heat, and heat at different temperatures is supplied to different use occasions. The cold storage component is used to store cold in winter and to provide cold for the park 1 in summer.

[0057] In this embodiment, during implementation, in summer, the cold storage component supplies cold to Park 1, and the heat storage and heat release component recovers hot carbon dioxide from Park 1 and stores heat using natural heat; in winter, the heat storage and heat release component supplies heat to Park 1 in winter, and the cold storage component condenses the carbon dioxide from the heat storage and heat release component into carbon dioxide liquid using natural cold and stores it.

[0058] In this embodiment, during specific implementation, the heat of the geothermal heater 3 comes from the heat stored in the soil in summer, and the geothermal heat temperature is lower than the outside temperature. Therefore, the temperature at which the geothermal heater 3 heats carbon dioxide is limited, and higher temperatures require the use of solar energy or electricity to obtain heat; the cold energy of the ground source condenser 19 comes from the cold energy carried by the soil in winter, and the geothermal cold temperature is lower than the outside temperature. Because the critical point temperature of carbon dioxide is 31.3°C, the cold energy of the ground source condenser is sufficient to condense carbon dioxide.

[0059] In this embodiment, during the specific implementation, the hot and cold water storage tanks 5, the hot and cold thermal oil storage tanks 9, and the hot and cold molten salt storage tanks 14 have hot storage and cold storage for storing hot and cold media respectively, and have corresponding valves. Different valves are opened during different energy storage and heat release processes to form a heat circulation of the heat transfer medium.

[0060] In this embodiment, during the specific implementation, carbon dioxide is used as a park-level object to store and release energy. To ensure safety, except for the park 1, solar panels 2 and necessary pipelines, etc., which are on the ground, the heat storage and release components and the cold storage components are all below 6m underground.

[0061] In this embodiment, during the specific implementation, the high-temperature carbon dioxide that stores thermal energy in the summer can also be used for power generation. Equipped with a corresponding turbine device, the high-temperature carbon dioxide power generation can not only supply power to the park 1 during the peak period of electricity consumption, but also supply power to the electrical equipment within the system, thereby improving energy utilization and being more economical.

[0062] In this embodiment, during specific implementation, the carbon dioxide energy storage and heat release system can store heat and release cold in summer, and store cold and release heat in winter, so as to achieve the purpose of matching the demand for cold and heat energy with the seasonal supply.

[0063] In this embodiment, during specific implementation, the temperature of the carbon dioxide gas at room temperature and pressure in the carbon dioxide gas storage tank 16 is less than 31.3° C., and the pressure is less than 7.38 MPa.

[0064] In this embodiment, during the specific implementation, the refrigeration heat exchanger 17 and the compressor 18 are set to output high-temperature and high-pressure carbon dioxide gas with a temperature greater than 31.3°C and a pressure greater than 7.38Mpa, that is, supercritical carbon dioxide gas. The high-temperature and high-pressure carbon dioxide gas is cooled by the ground source condenser 19, and the carbon dioxide is depressurized by the throttle valve 20. The supercritical carbon dioxide gas is self-condensed into liquid carbon dioxide and transported to the carbon dioxide storage tank 21 for energy storage.

[0065] In this embodiment, during the specific implementation, an injection branch pipe 13-5 and a molten salt pipeline 13-4 are set, the injection branch pipe 13-5 is a gas pipeline, and heat exchange is transmitted through air; the direct injection heat exchanger 13 adopts a carbon dioxide direct injection method, the molten salt pipeline is molten salt, and the introduced carbon dioxide contacts the molten salt pipeline for heat exchange.

[0066] The box body 8-1 is provided with a well-sealed outer wall. At the same time, in order to ensure the safety of the direct injection method, when the carbon dioxide concentration inside the box body 8-1 is too high or the temperature is too low, people should be restricted from approaching. At the same time, the inlet and outlet of the box body 8-1 should be provided with valves, which can be opened or closed according to the specific situation.

[0067] In this embodiment, a method for using a park-level energy storage heat release adjustment system includes the following steps:

[0068] First-stage energy storage and heat release: operate the geothermal heater 3, which performs first-stage heating on the carbon dioxide released by the summer cooling at the outlet of the park 1, to obtain first-stage heated carbon dioxide gas; wherein the temperature of the first-stage heated carbon dioxide gas does not exceed 100°C;

[0069] The carbon dioxide gas heated in the first stage is input through the air inlet of the first heat exchanger 4, and the cold water in the cold compartment of the cold and hot water storage tank 5 is input through the liquid inlet of the first heat exchanger 4. The carbon dioxide gas heated in the first stage heats the cold water to form hot water and is output through the liquid outlet of the first heat exchanger 4 to enter the hot compartment of the cold and hot water storage tank 5. The hot water in the hot compartment is transported to the park 1 through the hot water pipeline under the action of the first fluid booster pump 6 to supply hot water and heating in winter, and the carbon dioxide gas after the first stage of heat release is obtained through the air outlet of the first heat exchanger 4.

[0070] Second stage energy storage and heat release: The solar panel 2 is used to make the solar heater 7 work, and the carbon dioxide gas after the first stage heat release is heated by the solar heater 7 to obtain the second stage heated carbon dioxide gas; wherein the temperature of the second stage heated carbon dioxide gas is 100°C to 300°C;

[0071] The carbon dioxide gas heated in the second stage is input through the air inlet of the second heat exchanger 8, and the cold and hot oil in the cold bin of the cold and hot oil storage tank 9 is input through the liquid inlet of the second heat exchanger 8. The carbon dioxide gas heated in the second stage heats the cold oil to form hot oil and outputs it through the liquid outlet of the second heat exchanger 8 to enter the hot bin of the cold and hot oil storage tank 9 for storage. The hot oil in the hot bin is transported to the winter heating and carbon dioxide heat source compensation of the park 1 through the oil pipeline under the action of the heat oil pump 10, and the carbon dioxide gas after the second stage heat release is obtained through the air outlet of the second heat exchanger 8.

[0072] The third stage of energy storage and heat release: the electric heater 12 is operated to work, and the carbon dioxide gas after the second stage of heat release is heated by the electric heater 12 to obtain the third stage of heated carbon dioxide gas; wherein the temperature of the third stage of heated carbon dioxide gas is greater than 300°C;

[0073] The carbon dioxide gas heated in the third stage is input through the air inlet of the direct injection heat exchanger 13, and the cold molten salt in the cold bin of the cold and hot molten salt storage tank 14 is input through the inlet of the direct injection heat exchanger 13. The carbon dioxide gas heated in the third stage heats the cold molten salt to form hot molten salt and outputs through the outlet of the direct injection heat exchanger 13 to enter the hot bin of the cold and hot molten salt storage tank 14 for storage. The hot molten salt in the hot bin is transported to the park 1 for winter heating through the molten salt pipeline under the action of the first molten salt pump 15, and the carbon dioxide gas after the third stage heat release is obtained through the air outlet of the direct injection heat exchanger 13;

[0074] The carbon dioxide gas after the third stage heat release in winter passes through the refrigeration heat exchanger 17 and the compressor 18 to output high-temperature and high-pressure carbon dioxide gas. The high-temperature and high-pressure carbon dioxide gas is cooled by the ground source condenser 19 and reduced in pressure by the throttle valve 20. It is self-condensed into liquid carbon dioxide and transported to the carbon dioxide storage tank 21 for energy storage. The liquid carbon dioxide in the carbon dioxide storage tank 21 is transported to the park 1 through the carbon dioxide pipeline for summer cooling.

[0075] In summary, the present invention is reasonably designed, and utilizes the energy storage property of carbon dioxide in liquid and gaseous states to establish an underground carbon dioxide circulation, create a park-level cross-seasonal energy storage and heat release system, and achieve the purpose of storing heat in summer and taking heat in winter, and storing cold in winter and taking cold in summer.

[0076] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any way. Any simple modification, change and equivalent structural change made to the above embodiment based on the technical essence of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A park-level energy storage and heat release adjustment system, characterized in that: It comprises a heat storage and heat release component and a cold storage component connected to a park (1) and located underground, the heat storage and heat release component comprising a first-stage heat storage and heat release component, a second-stage heat storage and heat release component and a third-stage heat storage and heat release component connected in sequence, the first-stage heat storage and heat release component comprising a geothermal heater (3) connected to the outlet of the park (1), a first heat exchanger (4) connected to the output of the geothermal heater (3) and a cold and hot water storage tank (5) connected to the first heat exchanger (4); The second-stage heat storage and release component comprises a solar heater (7) connected to the first heat exchanger (4), a second heat exchanger (8) connected to the outlet of the solar heater (7), and a cold and hot thermal oil storage tank (9) connected to the second heat exchanger (8); The third-stage heat storage and heat release component comprises an electric heater (12) connected to the second heat exchanger (8), a direct injection heat exchanger (13) connected to the electric heater (12), and a cold and hot molten salt storage tank (14) connected to the direct injection heat exchanger (13); the output of the direct injection heat exchanger (13) is connected to a carbon dioxide gas storage tank (16), and the carbon dioxide gas storage tank (16) is connected to a cold storage component.

2. A park-level energy storage and heat release adjustment system according to claim 1, characterized in that: The hot and cold water storage tank (5) is provided with a first fluid booster pump (6), and the output of the first fluid booster pump (6) is connected to the park (1) through a hot water pipeline; The cold and hot thermal oil storage tanks (9) are provided with thermal oil pumps (10), the output of the thermal oil pumps (10) is connected to the park (1) through an oil pipeline, and the solar panels (2) connected to the solar heaters (7) are arranged on the ground; The cold and hot molten salt storage tanks (14) are provided with a first molten salt pump (15), and the output of the first molten salt pump (15) is connected to the park (1) through a molten salt pipeline.

3. A park-level energy storage and heat release adjustment system according to claim 1, characterized in that: The direct injection heat exchanger (13) comprises a housing (13-1), a carbon dioxide pipeline (13-2) arranged on the housing (13-1) and connected to the outlet of the electric heater (12), and a plurality of injection branches (13-5) connected to the carbon dioxide pipeline (13-2) and extending into the housing (13-1), and a molten salt pipeline (13-4) running through the housing (13-1), wherein the inlet and outlet of the molten salt pipeline (13-4) extend out of the housing (13-1), and a second molten salt pump (22) is arranged at the outlet of the cold chamber of the hot and cold molten salt storage tank (14), the inlet of the molten salt pipeline (13-4) is connected to the outlet of the second molten salt pump (22), and the outlet of the molten salt pipeline (13-4) is connected to the hot chamber of the hot and cold molten salt storage tank (14).

4. A park-level energy storage and heat release adjustment system according to claim 3, characterized in that: The box body (13-1) is connected to a carbon dioxide outlet pipe (13-7) and a clean gas pipeline (13-3), and the carbon dioxide outlet pipe (13-7) is connected to a carbon dioxide gas storage tank (16); The bottom of the injection branch pipe (13-5) is close to the molten salt pipeline (13-4), and a nozzle (13-6) is arranged at the bottom of the injection branch pipe (13-5).

5. A park-level energy storage and heat release adjustment system according to claim 1, characterized in that: The cold storage component comprises a refrigeration heat exchanger (17), a compressor (18), a ground source condenser (19), a throttle valve (20) and a carbon dioxide storage tank (21) which are connected in sequence. The carbon dioxide storage tank (21) is connected to the park (1) via a carbon dioxide pipeline. The air inlet of the refrigeration heat exchanger (17) is connected to the carbon dioxide gas storage tank (16). The hot chamber of the cold and hot thermal oil storage tank (9) is connected to the liquid inlet of the refrigeration heat exchanger (17) via a delivery booster pump (11). The air outlet of the refrigeration heat exchanger (17) is connected to the compressor (18). The liquid outlet of the refrigeration heat exchanger (17) is connected to the cold chamber of the cold and hot thermal oil storage tank (9). The outlet of the compressor (18) is connected to the air inlet of the ground source condenser (19). The air outlet of the ground source condenser (19) is connected to the inlet of the throttle valve (20). The outlet of the throttle valve (20) is connected to the carbon dioxide storage tank (21).

6. A method for using the park-level energy storage and heat release adjustment system as claimed in claim 1, characterized in that: The method comprises the following steps: First-stage energy storage and heat release: operating the geothermal heater (3), the geothermal heater (3) performs first-stage heating on the carbon dioxide released by the summer cooling outlet of the park (1), thereby obtaining first-stage heated carbon dioxide gas; wherein the temperature of the first-stage heated carbon dioxide gas does not exceed 100° C.; The carbon dioxide gas heated in the first stage is input through the air inlet of the first heat exchanger (4), and the cold water in the cold compartment of the cold and hot water storage tank (5) is input through the liquid inlet of the first heat exchanger (4). The carbon dioxide gas heated in the first stage heats the cold water to form hot water, which is output through the liquid outlet of the first heat exchanger (4) and enters the hot compartment of the cold and hot water storage tank (5). The hot water in the hot compartment is transported to the park (1) through the hot water pipeline under the action of the first fluid booster pump (6) to supply hot water and heating in winter, and the carbon dioxide gas after the first stage of heat release is obtained through the air outlet of the first heat exchanger (4); Second stage energy storage and heat release: the solar panel (2) is used to operate the solar heater (7), and the carbon dioxide gas after the first stage heat release is heated by the solar heater (7) to obtain second stage heated carbon dioxide gas; wherein the temperature of the second stage heated carbon dioxide gas is 100° C. to 300° C.; The carbon dioxide gas heated in the second stage is input through the air inlet of the second heat exchanger (8), and the cold and hot oil in the cold bin of the cold and hot oil storage tank (9) is input through the liquid inlet of the second heat exchanger (8). The carbon dioxide gas heated in the second stage heats the cold oil to form hot oil, which is output through the liquid outlet of the second heat exchanger (8) and enters the hot bin of the cold and hot oil storage tank (9) for storage. The hot oil in the hot bin is transported to the park (1) through the oil pipeline for winter heating and carbon dioxide heat source compensation under the action of the heat oil pump (10), and the carbon dioxide gas after the second stage heat release is obtained through the air outlet of the second heat exchanger (8); The third stage of energy storage and heat release: the electric heater (12) is operated to heat the carbon dioxide gas after the second stage of heat release through the electric heater (12) to obtain the third stage of heated carbon dioxide gas; wherein the temperature of the third stage of heated carbon dioxide gas is greater than 300° C.; The carbon dioxide gas heated in the third stage is input through the air inlet of the direct injection heat exchanger (13), and the cold molten salt in the cold bin of the cold and hot molten salt storage tank (14) is input through the inlet of the direct injection heat exchanger (13). The carbon dioxide gas heated in the third stage heats the cold molten salt to form hot molten salt, which is output through the outlet of the direct injection heat exchanger (13) and enters the hot bin of the cold and hot molten salt storage tank (14) for storage. The hot molten salt in the hot bin is transported to the park (1) for winter heating through the molten salt pipeline under the action of the first molten salt pump (15), and the carbon dioxide gas after the third stage heat release is obtained through the air outlet of the direct injection heat exchanger (13); The carbon dioxide gas after the third stage of heat release in winter passes through a refrigeration heat exchanger (17) and a compressor (18) to output high-temperature and high-pressure carbon dioxide gas. The high-temperature and high-pressure carbon dioxide gas is cooled by a ground source condenser (19) and is depressurized by a throttle valve (20). It is self-condensed into liquid carbon dioxide and transported to a carbon dioxide storage tank (21) for energy storage. The liquid carbon dioxide in the carbon dioxide storage tank (21) is transported to the park (1) through a carbon dioxide pipeline for summer cooling.

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