Centralized carbon dioxide energy storage system in central urban area and method thereof

Abstract

The invention belongs to the technical field of energy storage, and relates to a central urban area centralized carbon dioxide energy storage system and a method thereof.The central urban area centralized carbon dioxide energy storage system comprises a storage module and an energy storage heat supply module, and the energy storage heat supply module comprises a heat storage unit and a compressor, a cooler and a condenser which are sequentially connected; and the energy-releasing power supply and cold supply module comprises a cold energy storage unit, and an evaporator, a heater, a turbine and a reheater which are connected in sequence. The storage module with the largest occupied area can be arranged at the position far away from a community, the energy storage heat supply module and the energy release power supply and cold supply module are arranged on the user side, centralized storage of working media and distributed supply of energy are achieved through long-distance conveying of carbon dioxide, the system can cover all energy consumption units in a large range, and the energy utilization efficiency is improved. And power supply, heat supply and cold supply are close to the user side, so that the loss in the energy transmission process is greatly reduced, the energy waste during power supply, heat supply and cold supply is reduced, and the comprehensive energy utilization efficiency of the system is also remarkably improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of energy storage and relates to a centralized carbon dioxide energy storage system in a central urban area and a method thereof. Background Art

[0002] With the rapid development of cities, central urban areas are increasingly demanding efficient energy utilization and environmental sustainability. In the energy supply sector, large-scale energy storage systems, a key component in balancing energy supply and demand and ensuring a stable energy supply, face a severe layout dilemma. Large-scale energy storage systems store electricity or other forms of energy and can provide power, heating, and cooling when needed. However, large-scale energy storage systems occupy a large area, and land resources in central urban areas are scarce, making it difficult to provide sufficient space. Consequently, they are forced to be located in areas far from community areas.

[0003] At present, large-scale energy storage systems often adopt centralized power supply, heating and cooling when providing power, heating and cooling. Electricity, heat and cooling are transmitted over long distances from remote energy storage locations to users in the central urban area to provide power, heating and cooling to users in the central urban area. However, due to the long-distance transmission of electricity, heat and cooling, a large amount of electricity, heat and cooling is lost during the transmission process, which not only causes a large amount of energy waste, but also reduces energy utilization. Summary of the Invention

[0004] The object of the present invention is to provide a centralized carbon dioxide energy storage system and method for a central urban area, which can reduce energy waste and improve energy utilization during power supply, heating and cooling.

[0005] To achieve the above objectives, the present invention provides the following technical solutions: A centralized carbon dioxide energy storage system in a central urban area, comprising: The storage module is set up at a location far away from the community. The storage module includes a gas storage reservoir and a liquid storage tank. The gas storage reservoir is used to store gaseous carbon dioxide, and the liquid storage tank is used to store liquid carbon dioxide.

[0006] The energy storage heating module is provided on the user side and includes a heat storage unit and a compressor, a cooler, and a condenser connected in sequence. The compressor is connected to the gas storage reservoir, the condenser is connected to the liquid storage tank, and the cooler is connected to the heat storage unit. The compressor is used to compress gaseous carbon dioxide to generate compression heat. The cooler is used to exchange heat between the compressed gaseous carbon dioxide and the heat storage medium in the heat storage unit to store the compression heat in the heat storage unit. The heat storage unit is used to provide heat to the user side. The condenser is used to cool the carbon dioxide after heat exchange to turn it into liquid carbon dioxide, and then store the liquid carbon dioxide in the liquid storage tank. The energy-releasing power supply and cooling module is arranged on the user side. The energy-releasing power supply and cooling module includes a cold storage unit and an evaporator, a heater, a turbine and a reheater connected in sequence. The evaporator is connected to the liquid storage tank, the reheater is connected to the gas storage reservoir, the heater is connected to the heat storage unit, and the reheater is connected to the cold storage unit. The evaporator is used to convert liquid carbon dioxide into gaseous carbon dioxide. The heater uses the heat storage medium in the heat storage unit to heat the gaseous carbon dioxide. The turbine is used to expand the heated gaseous carbon dioxide to drive the generator to generate electricity and supply the generated electricity to the user side. The reheater is connected to the cold storage unit. The reheater is used to exchange heat between the gaseous carbon dioxide after expansion and the cold storage medium in the cold storage unit to store the cold in the gaseous carbon dioxide after expansion in the cold storage unit. The cold storage unit is used to provide cooling for the user side. The gaseous carbon dioxide after heat exchange enters the gas storage reservoir for storage.

[0007] The present invention is also characterized in that: The low temperature tank stores a heat storage medium therein, the outlet of the low temperature tank is connected to the first inlet of the cooler, and the first inlet of the low temperature tank is connected to the first outlet of the heater; The inlet of the high-temperature tank is connected to the first outlet of the cooler, and the first outlet of the high-temperature tank is connected to the first inlet of the heater.

[0008] The heating heat exchanger has a first inlet connected to the second outlet of the high-temperature tank, and the first outlet of the heating heat exchanger is connected to the second inlet of the low-temperature tank. The heating heat exchanger is used to utilize the heat in the heat storage medium to provide heat to the user side.

[0009] The cold storage unit includes: The cold storage tank stores a cold storage medium therein, which is water. The inlet of the cold storage tank is connected to the first outlet of the reheater, and the first inlet of the reheater is connected to a water source.

[0010] The refrigeration heat exchanger has a first inlet connected to the outlet of the cold storage tank, and a first outlet connected to the outside world. The refrigeration heat exchanger is used to utilize the cold energy in the water to provide cooling for the user side.

[0011] The first inlet of the condenser is connected to a water source, and the first outlet of the condenser is connected to a first storage tank. The condenser is used to cool the carbon dioxide after heat exchange with water, and store the water with increased temperature in the first storage tank. The first storage tank is used to use the heat in the water to provide heating to the user side.

[0012] The first inlet of the evaporator is connected to a water source, and the first outlet of the evaporator is connected to the inlet of a second storage tank. The evaporator is used to use water and liquid carbon dioxide to exchange heat, so that the water temperature is reduced and then stored in the second storage tank. The second storage tank is used to use the cold energy in the water to provide cooling to the user side.

[0013] The gas storage reservoir is connected to a carbon capture device, which is used to capture gaseous carbon dioxide in industrial waste gas and store the captured gaseous carbon dioxide in the gas storage reservoir.

[0014] A centralized carbon dioxide energy storage method in a central urban area comprises the following steps: The normal temperature and pressure carbon dioxide in the gas storage is introduced into the compressor for compression, and the normal temperature and pressure carbon dioxide becomes high temperature and high pressure carbon dioxide. The high temperature and high pressure carbon dioxide enters the cooler for heat exchange with the heat storage medium from the heat storage unit, and the high temperature and high pressure carbon dioxide becomes normal temperature and high pressure carbon dioxide. After the heat storage medium is heated, the stored heat is used to provide heat to the user side. The normal temperature and high pressure carbon dioxide enters the condenser for cooling and becomes liquid carbon dioxide and is stored in the liquid storage tank, completing energy storage and heating.

[0015] The liquid carbon dioxide in the storage tank is introduced into the evaporator for heat exchange, so that the liquid carbon dioxide becomes normal temperature and high pressure carbon dioxide. The normal temperature and high pressure carbon dioxide enters the heater and the heat storage medium of the heat storage unit for heat exchange, and the normal temperature and high pressure carbon dioxide becomes high temperature and high pressure carbon dioxide. The high temperature and high pressure carbon dioxide enters the turbine for expansion and work to drive the generator to generate electricity and supply the generated electricity to the user side. After the high temperature and high pressure carbon dioxide expands and does work, it becomes low temperature and normal pressure carbon dioxide. The low temperature and normal pressure carbon dioxide enters the reheater and exchanges heat with the cold storage medium in the cold storage unit. The low temperature and normal pressure carbon dioxide becomes normal temperature and normal pressure carbon dioxide and is stored in the gas storage reservoir. After the cold storage medium is cooled, the stored cold is used to supply cooling to the user side, completing energy release, power supply and cooling.

[0016] The temperature of high-temperature and high-pressure carbon dioxide is 200℃~250℃ and the pressure is 5.0MPa~7.3MPa, the pressure of normal-temperature and high-pressure carbon dioxide is 5.0MPa~7.3MPa, the temperature of liquid carbon dioxide is 14.0℃~30.5℃ and the pressure is 5.0MPa~7.3MPa, and the temperature of low-temperature and normal-pressure carbon dioxide is -10℃~5℃.

[0017] The central urban area centralized carbon dioxide energy storage system and method of the present invention have the following advantages: Through the coordination of the storage module, the energy storage and heating module, and the energy release power supply and cooling module, the present invention can set the storage module that occupies the largest area at a location far away from the community, and set the energy storage and heating module and the energy release power supply and cooling module on the user side. By utilizing the long-distance transmission of carbon dioxide, centralized storage of working fluids and distributed supply of energy are realized, so that the system can cover all energy-consuming units in a large area, and the power supply, heating and cooling are close to the user side, which greatly reduces the loss in the energy transmission process. It not only reduces the waste of energy during power supply, heating and cooling, but also significantly improves the comprehensive energy utilization efficiency of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is the overall layout diagram of the system of the present invention.

[0019] Figure 2 This is a schematic structural diagram of the heat storage and energy supply module in the present invention.

[0020] Figure 3 It is a structural diagram of the energy-releasing power supply and cooling module in the present invention.

[0021] Figure 4 It is a schematic diagram of the overall process of the present invention.

[0022] Reference numerals: 1. Carbon capture device, 2. Gas storage, 3. Liquid storage tank, 10. Local user side, 11. Local energy storage and heating module, 12. Local energy release, power supply and cooling module, 20. Remote user side, 21. Remote energy storage and heating module, 22. Remote energy release, power supply and cooling module, 30. Compressor, 31. Cooler, 32. Condenser, 33. Low-temperature tank, 34. High-temperature tank, 35. Heating heat exchanger, 36. First storage tank, 40. Evaporator, 41. Heater, 42. Turbine, 43. Reheater, 44. Cold storage tank, 45. Refrigeration heat exchanger, 46. Second storage tank, 50. Signal processing center, 51. First control valve, 52. Second control valve, 53. Third control valve, 54. Fourth control valve, 55. Fifth control valve, 56. Sixth control valve, 57. Seventh control valve, 58. Eighth control valve. DETAILED DESCRIPTION

[0023] The technical solutions in the present invention will be described clearly and in detail below with reference to the accompanying drawings. In the description of the embodiments of the present invention, unless otherwise specified, " / " means or, for example, A / B can mean A or B: "and / or" in the text is only a description of the association relationship of associated objects, indicating that there can be three relationships, such as A and / or B, which can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, in the description of the embodiments of the present invention, "multiple" refers to two or more than two. The following terms "first" and "second" are used for descriptive purposes only and cannot be understood as implying or suggesting relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features.

[0024] like Figure 1 、 Figure 2 、 Figure 3As shown, the present invention provides a centralized carbon dioxide energy storage system in a central urban area, including a storage module, an energy storage and heating module, and an energy release, power supply, and cooling module. The storage module is arranged at a location far away from the community. The storage module includes a gas storage reservoir 2 and a liquid storage tank 3. The gas storage reservoir 2 is used to store gaseous carbon dioxide, and the liquid storage tank 3 is used to store liquid carbon dioxide. The energy storage and heating module is arranged on the user side. The energy storage and heating module includes a heat storage unit and a compressor 30, a cooler 31, and a condenser 32 connected in sequence. The compressor 30 is connected to the gas storage reservoir 2, the condenser 32 is connected to the liquid storage tank 3, and the cooler 31 is connected to the heat storage unit. The compressor 30 is used to compress gaseous carbon dioxide to generate compression heat. The cooler 31 is used to exchange heat between the compressed gaseous carbon dioxide and the heat storage medium in the heat storage unit to store the compression heat in the heat storage unit. The heat storage unit is used to provide heat to the user side. The condenser 32 is used to cool the carbon dioxide after heat exchange to turn it into liquid carbon dioxide, and to convert the liquid The liquid carbon dioxide is stored in the liquid storage tank 3, and the energy-releasing power supply and cooling module is arranged on the user side. The energy-releasing power supply and cooling module includes a cold storage unit and an evaporator 40, a heater 41, a turbine 42 and a reheater 43 connected in sequence. The evaporator 40 is connected to the liquid storage tank 3, the reheater 43 is connected to the gas storage reservoir 2, the heater 41 is connected to the heat storage unit, and the reheater 43 is connected to the cold storage unit. The evaporator 40 is used to convert liquid carbon dioxide into gaseous carbon dioxide, the heater 41 uses the heat storage medium in the heat storage unit to heat the gaseous carbon dioxide, the turbine 42 is used to expand the heated gaseous carbon dioxide to drive the generator to generate electricity and supply the generated electricity to the user side, the reheater 43 is used to exchange heat between the gaseous carbon dioxide after the expansion and the cold storage medium in the cold storage unit, and store the cold in the gaseous carbon dioxide after the expansion and work in the cold storage unit. The cold storage unit is used to provide cooling for the user side, and the gaseous carbon dioxide after heat exchange enters the gas storage reservoir 2 for storage. The present invention places the storage module that occupies the largest area at a location far away from the community, and places the energy storage heating module and the energy release power supply and cooling module on the user side. By utilizing the long-distance transmission of carbon dioxide, the centralized storage of working fluids and the distributed supply of energy are achieved, so that the system can cover all energy-consuming units in a large area. The power supply, heating and cooling are close to the user side, which greatly reduces the loss during energy transmission. It not only reduces the energy waste during power supply, heating and cooling, but also significantly improves the overall energy utilization efficiency of the system.

[0025] like Figure 1As shown, the energy storage and heating module includes a local energy storage and heating module 11 and a remote energy storage and heating module 21, and the energy release power supply and cooling module includes a local energy release power supply and cooling module 12 and a remote energy release power supply and cooling module 22. The local energy storage and heating module 11 and the local energy release power supply and cooling module 12 are arranged at a position close to the local user side 10, and the remote energy storage and heating module 21 and the remote energy release power supply and cooling module 22 are arranged at a position close to the remote user side 20. The inlet of the local energy storage and heating module 11 and the inlet of the remote energy storage and heating module 21 are connected to the gas storage reservoir 2 through a gas main pipeline. The gas main pipeline is used to transport the gaseous carbon dioxide in the gas storage reservoir 2 to the local energy storage and heating module 11 and the remote energy storage and heating module 21. The outlet of the local energy storage and heating module 11 and the outlet of the remote energy storage and heating module 21 are connected to the gas storage reservoir 2. It is connected to the liquid storage tank 3 through a liquid main pipeline. The liquid main pipeline is used to transport the liquid carbon dioxide generated by the local energy storage and heating module 11 and the remote energy storage and heating module 21 to the liquid storage tank 3 for storage. The inlet of the local energy release power supply and cooling module 12 and the inlet of the remote energy release power supply and cooling module 22 are connected to the liquid storage tank 3 through a liquid main pipeline. The liquid main pipeline is used to transport the liquid carbon dioxide in the liquid storage tank 3 to the local energy release power supply and cooling module 12 and the remote energy release power supply and cooling module 22. The outlet of the local energy release power supply and cooling module 12 and the outlet of the remote energy release power supply and cooling module 22 are connected to the gas storage reservoir 2 through a gas main pipeline. The gas main pipeline is used to transport the gaseous carbon dioxide generated by the local energy release power supply and cooling module 12 and the remote energy release power supply and cooling module 22 to the gas storage reservoir 2 for storage.

[0026] like Figure 2 As shown, the heat storage unit includes a low-temperature tank 33, a high-temperature tank 34 and a heat supply heat exchanger 35. The low-temperature tank 33 stores a heat storage medium. The outlet of the low-temperature tank 33 is connected to the first inlet of the cooler 31, the first inlet of the low-temperature tank 33 is connected to the first outlet of the heater 41, the inlet of the high-temperature tank 34 is connected to the first outlet of the cooler 31, the first outlet of the high-temperature tank 34 is connected to the first inlet of the heater 41, the first inlet of the heat supply heat exchanger 35 is connected to the second outlet of the high-temperature tank 34, the first outlet of the heat supply heat exchanger 35 is connected to the second inlet of the low-temperature tank 33, and the heat supply heat exchanger 35 is used to use the heat in the heat storage medium to provide heat to the user side.

[0027] like Figure 3 As shown, the cold storage unit includes a cold storage tank 44 and a refrigeration heat exchanger 45. The cold storage tank 44 stores a cold storage medium, which is water. The inlet of the cold storage tank 44 is connected to the first outlet of the reheater 43. The first inlet of the reheater 43 is connected to a water source. The first inlet of the refrigeration heat exchanger 45 is connected to the outlet of the cold storage tank 44. The first outlet of the refrigeration heat exchanger 45 is connected to the outside world. The refrigeration heat exchanger 45 is used to use the cold in the water to provide cooling for the user side.

[0028] like Figure 2 As shown, the first inlet of the condenser 32 is connected to a water source, and the first outlet of the condenser 32 is connected to a first storage tank 36. The condenser 32 is used to cool the carbon dioxide after heat exchange with water, and store the water with increased temperature in the first storage tank 36. The first storage tank 36 is used to use the heat in the water to provide heating to the user side.

[0029] like Figure 3 As shown, the first inlet of the evaporator 40 is connected to a water source, and the first outlet of the evaporator 40 is connected to the inlet of the second storage tank 46. The evaporator 40 is used to use water and liquid carbon dioxide to exchange heat, so that the water temperature is reduced and then stored in the second storage tank 46. The second storage tank 46 is used to use the cold energy in the water to provide cooling to the user side.

[0030] like Figure 2 、 Figure 3 As shown, the outlet of the gas storage reservoir 2 is connected to the inlet of the compressor 30, the outlet of the compressor 30 is connected to the second inlet of the cooler 31, the second outlet of the cooler 31 is connected to the second inlet of the condenser 32, the second outlet of the condenser 32 is connected to the inlet of the liquid storage tank 3, the outlet of the liquid storage tank 3 is connected to the second inlet of the evaporator 40, the second outlet of the evaporator 40 is connected to the second inlet of the heater 41, the second outlet of the heater 41 is connected to the inlet of the turbine 42, the outlet of the turbine 42 is connected to the second inlet of the reheater 43, and the second outlet of the reheater 43 is connected to the inlet of the gas storage reservoir 2.

[0031] like Figure 2 、 Figure 3As shown, the present invention provides a centralized carbon dioxide energy storage system in a central urban area, which also includes a signal processing center 50. The signal processing center 50 is arranged on the user side, the first inlet of the heating heat exchanger 35 is provided with a first control valve 51, the second inlet of the heating heat exchanger 35 is connected to the first outlet of the user side, the second outlet of the heating heat exchanger 35 is connected to the first inlet of the user side, the second inlet of the heating heat exchanger 35 is provided with a second control valve 52, the outlet of the first storage tank 36 is provided with a third control valve 53, the outlet of the liquid storage tank 3 is provided with a fourth control valve 54, the first inlet of the heater 41 is provided with a fifth control valve 55, the outlet of the second storage tank 46 is provided with a sixth control valve 56, the second inlet of the cooling heat exchanger 45 is connected to the second outlet of the user side, and the second outlet of the cooling heat exchanger 45 is connected to the second outlet of the user side. The second inlet is connected, the second inlet of the refrigeration heat exchanger 45 is provided with a seventh control valve 57, and the first inlet of the refrigeration heat exchanger 45 is provided with an eighth control valve 58. The signal processing center 50 is electrically connected to the first control valve 51, the second control valve 52, the third control valve 53, the fourth control valve 54, the fifth control valve 55, the sixth control valve 56, the seventh control valve 57, and the eighth control valve 58 respectively. The signal processing center 50 is used to receive the control signal from the user side and convert the control signal into a valve opening signal. The opening of the first control valve 51, the second control valve 52, the third control valve 53, the fourth control valve 54, the fifth control valve 55, the sixth control valve 56, the seventh control valve 57, and the eighth control valve 58 is controlled by the valve opening signal, thereby regulating the working status of the energy storage heating module, the energy release power supply and the cooling module.

[0032] Among them, a distributed photovoltaic power generation module is provided on the user side, which is electrically connected to the compressor 30. The distributed photovoltaic power generation module is used to utilize solar energy to generate electricity and supply the generated electricity to the compressor 30 to drive the compressor 30 to operate.

[0033] like Figure 1 As shown, the gas storage reservoir 2 is connected to a carbon capture device 1 , which is used to capture gaseous carbon dioxide in industrial waste gas and store the captured gaseous carbon dioxide in the gas storage reservoir 2 .

[0034] like Figure 4 As shown, the present invention also provides a centralized carbon dioxide energy storage method in a central urban area, comprising the following steps: The normal temperature and pressure carbon dioxide in the gas storage reservoir 2 is introduced into the compressor 30 for compression, and the normal temperature and pressure carbon dioxide becomes high temperature and high pressure carbon dioxide. The high temperature and high pressure carbon dioxide enters the cooler 31 for heat exchange with the heat storage medium from the heat storage unit, and the high temperature and high pressure carbon dioxide becomes normal temperature and high pressure carbon dioxide. After the heat storage medium is heated, the heat stored in it is used to provide heat to the user side. The normal temperature and high pressure carbon dioxide enters the condenser 32 for cooling and cooling, and the normal temperature and high pressure carbon dioxide becomes liquid carbon dioxide and is stored in the liquid storage tank 3, completing energy storage and heating.

[0035] The liquid carbon dioxide in the liquid storage tank 3 is introduced into the evaporator 40 for heat exchange, so that the liquid carbon dioxide becomes normal temperature and high pressure carbon dioxide, and the normal temperature and high pressure carbon dioxide enters the heater 41 for heat exchange with the heat storage medium of the heat storage unit, and the normal temperature and high pressure carbon dioxide becomes high temperature and high pressure carbon dioxide, and the high temperature and high pressure carbon dioxide enters the turbine 42 for expansion and work to drive the generator to generate electricity and supply the generated electricity to the user side, and the high temperature and high pressure carbon dioxide expands and does work to become low temperature and normal pressure carbon dioxide, and the low temperature and normal pressure carbon dioxide enters the reheater 43 for heat exchange with the cold storage medium in the cold storage unit, and the low temperature and normal pressure carbon dioxide becomes normal temperature and normal pressure carbon dioxide and is stored in the gas storage reservoir 2. After the cold storage medium is cooled, the stored cold is used to supply cold to the user side, completing energy release, power supply and cold supply.

[0036] Among them, the temperature of high-temperature and high-pressure carbon dioxide is 200℃~250℃ and the pressure is 5.0MPa~7.3MPa, the temperature of normal-temperature and high-pressure carbon dioxide is 25℃ and the pressure is 5.0MPa~7.3MPa, the temperature of liquid carbon dioxide is 14.0℃~30.5℃ and the pressure is 5.0MPa~7.3MPa, and the temperature of low-temperature and normal-pressure carbon dioxide is -10℃~5℃ and the pressure is 101.3kPa.

[0037] Working principle: When the user side only has a demand for electricity consumption, a signal is sent through the signal processing center 50 to control the closing of the first control valve 51, the second control valve 52 and the third control valve 53. The normal temperature and pressure carbon dioxide in the gas storage reservoir 2 is transported to the energy storage and heating module through the gas main pipeline. The distributed photovoltaic power generation module arranged on the user side generates electricity and drives the compressor 30 to compress the normal temperature and pressure gaseous carbon dioxide into high-temperature and high-pressure carbon dioxide. The high-temperature and high-pressure carbon dioxide enters the cooler 31 and exchanges heat with the heat storage medium from the low-temperature tank 33. After the temperature of the heat storage medium rises, it enters the high-temperature tank 34 for storage. The high-temperature and high-pressure carbon dioxide becomes normal temperature and high-pressure carbon dioxide and enters the condenser 32 for heat exchange with normal temperature water. The normal temperature and high-pressure carbon dioxide becomes liquid carbon dioxide and is transported to the liquid storage tank 3 through the liquid main pipeline for storage. After the temperature of the normal temperature water rises, it enters the first storage tank 36 for storage.

[0038] When a user needs warm water for hand washing or laundry at a lower temperature, the signal processing center 50 receives a control signal from the user and controls the closing of the first and second control valves 51 and 52, and the opening of the third control valve 53. The water stored in the first storage tank 36 is then supplied to the user. When a user needs heat at a higher temperature, such as for heating, the signal processing center 50 controls the closing of the third control valve 53 and the opening of the second and second control valves 51 and 52. The ambient temperature water from the user enters the heat exchanger 35, where it exchanges heat with the heat storage medium from the high-temperature tank 34 and is heated. The resulting high-temperature water is then used for heating the user, while the heat storage medium, which has been cooled by heat, is returned to the low-temperature tank 33 for storage. The signal processing center 50 can flexibly adjust the openings of the first and second control valves 51 and 52 based on the user's actual heating power and temperature requirements, thereby controlling the flow of water in the heat exchanger 35 and achieving power and temperature control.

[0039] When the user side only has electricity demand, the signal processing center 50 controls the closing of the sixth control valve 56, the seventh control valve 57, and the eighth control valve 58, and opens the fourth control valve 54 and the fifth control valve 55. The liquid carbon dioxide in the liquid storage tank 3 is transported to the energy release power supply and cooling module on the user side through the liquid main pipeline. The liquid carbon dioxide enters the evaporator 40 and exchanges heat with the room temperature water. The liquid carbon dioxide becomes gaseous room temperature and high pressure carbon dioxide. After the room temperature water temperature drops, it enters the second storage tank 46 for storage. The room temperature and high pressure carbon dioxide enters the heater 41 and exchanges heat with the water from the high temperature. The heat storage medium in tank 34 is heated by heat exchange, and after the temperature of the heat storage medium drops, it enters the low-temperature tank 33 for storage. The normal-temperature and high-pressure carbon dioxide becomes high-temperature and high-pressure carbon dioxide, enters the turbine 42 for expansion and work, drives the generator to generate electricity, and supplies the generated electricity to the user side. After the high-temperature and high-pressure carbon dioxide expands and works, it becomes low-temperature and normal-pressure carbon dioxide. The low-temperature and normal-pressure carbon dioxide enters the reheater 43 for heat exchange with normal-temperature water. The low-temperature and normal-pressure carbon dioxide becomes normal-temperature and normal-pressure carbon dioxide and is transported to the gas storage reservoir 2 for storage through the gas main pipeline. The normal-temperature water becomes cold water and enters the cold storage tank 44 for storage.

[0040] When the user demands a lower cooling temperature, the signal processing center 50 controls the closing of the seventh and eighth control valves 57 and 58, and the opening of the sixth control valve 56, utilizing the cold water stored in the second storage tank 46 to supply cooling to the user. When the user demands an even lower cooling temperature, the signal processing center 50 controls the closing of the sixth control valve 56 and the opening of the seventh and eighth control valves 57 and 58. The ambient temperature water output from the user enters the refrigeration heat exchanger 45, where it exchanges heat with the cold water from the cold storage tank 44 for cooling. After the ambient temperature water cools, it supplies cooling to the user. The cold water, which has absorbed heat and heated up, is discharged to the environment or recycled for reuse. The signal processing center 50 can flexibly adjust the opening of the seventh and eighth control valves 57 and 58 based on the actual cooling temperature demanded by the user, thereby controlling the flow of water in the refrigeration heat exchanger 45 and achieving control over the cooling temperature.

[0041] Other advantages of the central urban area centralized carbon dioxide energy storage system and method of the present invention are as follows: First, the present invention places the storage unit away from the urban area and close to large carbon emission sources such as factories, which can store carbon dioxide on site and enable the carbon capture equipment to quickly capture a large amount of carbon dioxide, saving carbon dioxide transportation costs, improving carbon dioxide collection efficiency, and reducing adverse effects on the central urban area.

[0042] Second, while conventional energy storage systems only consider a single electrical energy output, the present invention can coordinate the supply of heat, electricity, and cooling based on the user's actual power supply, cooling, and heating needs, meeting the user's energy needs in various application scenarios. Furthermore, through flexible module combinations and control mechanisms, the present system can meet the user's energy needs in various application scenarios, tailored to the energy needs of different time periods and intensities.

[0043] Third, the present invention can meet the energy needs of users in various application scenarios through flexible module combinations and the joint regulation of multiple control valves, based on energy demand at different times and intensities. It can also adjust the output ratio of the three energy sources and the supply temperatures of cold and hot energy according to actual needs, significantly improving the flexibility of the system. For example, in the hot summer, the system can enhance the cooling function while rationally allocating electricity and waste heat resources; in the cold winter, it focuses on ensuring heating while taking into account the power supply. This design effectively improves the adaptability of the system, enabling it to seamlessly meet the diverse needs of users in various scenarios.

[0044] Fourth, the present invention can comprehensively utilize sensible heat and latent heat to ensure sufficient energy supply and improve energy utilization. Under the traditional energy utilization framework, the energy conversion and utilization mode is relatively simple, making it difficult to fully tap the full potential of energy, resulting in a significant energy loss problem. In comparison, the present invention carries out innovative and coordinated utilization of sensible heat and latent heat. When the system is in operation, carbon dioxide is used as the core working fluid. During the compression process, carbon dioxide reaches a high temperature and high pressure state through the action of the compressor, at which time a large amount of sensible heat accumulates. With the help of the condenser, this sensible heat is transferred to the circulating water in the form of heat exchange. The heat generated is precisely matched to the heat demand of residential heating, commercial hot water supply, etc., realizing efficient resource utilization of sensible heat. In the evaporator link, the liquid carbon dioxide undergoes a gasification phase change. This process absorbs a large amount of ambient heat, which is essentially an effective utilization of latent heat, thereby achieving an efficient refrigeration effect. In the different stages of energy storage and release, the changes in sensible heat and latent heat associated with the change of carbon dioxide state are accurately captured and fully utilized through a carefully designed heat exchange network and energy recovery system.

[0045] It will be understood that the present invention is described by way of some embodiments, and it will be appreciated by those skilled in the art that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. In addition, under the teachings of the present invention, these features and embodiments may be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of the present invention are intended to be protected by the present invention.

Claims

1. A centralized carbon dioxide energy storage system in a central urban area, characterized by: include: A storage module is provided at a location away from the community, the storage module comprising a gas storage reservoir (2) and a liquid storage tank (3), the gas storage reservoir (2) being used to store gaseous carbon dioxide, and the liquid storage tank (3) being used to store liquid carbon dioxide; An energy storage heating module is provided on the user side. The energy storage heating module includes a heat storage unit and a compressor (30), a cooler (31) and a condenser (32) connected in sequence. The compressor (30) is connected to the gas storage reservoir (2), the condenser (32) is connected to the liquid storage tank (3), and the cooler (31) is connected to the heat storage unit. The compressor (30) is used to compress gaseous carbon dioxide to generate compression heat. The cooler (31) is used to exchange heat between the compressed gaseous carbon dioxide and the heat storage medium in the heat storage unit to store the compression heat in the heat storage unit. The heat storage unit is used to provide heat to the user side. The condenser (32) is used to cool the carbon dioxide after heat exchange to convert it into liquid carbon dioxide, and store the liquid carbon dioxide in the liquid storage tank (3). The energy-releasing power supply and cooling module is arranged on the user side. The energy-releasing power supply and cooling module includes a cold storage unit and an evaporator (40), a heater (41), a turbine (42) and a reheater (43) connected in sequence. The evaporator (40) is connected to the liquid storage tank (3), the reheater (43) is connected to the gas storage reservoir (2), the heater (41) is connected to the heat storage unit, and the reheater (43) is connected to the cold storage unit. The evaporator (40) is used to convert liquid carbon dioxide into gaseous carbon dioxide. The heater (41) uses the heat in the heat storage unit to generate heat. The heat storage medium heats the gaseous carbon dioxide, the turbine (42) is used to expand the heated gaseous carbon dioxide to drive the generator to generate electricity and supply the generated electricity to the user side, the reheater (43) is connected to the cold storage unit, the reheater (43) is used to exchange heat between the gaseous carbon dioxide after the expansion and the cold storage medium in the cold storage unit, and store the cold in the gaseous carbon dioxide after the expansion and the cold storage unit. The cold storage unit is used to supply cold to the user side, and the gaseous carbon dioxide after the heat exchange enters the gas storage reservoir (2) for storage.

2. A centralized carbon dioxide energy storage system in a central urban area according to claim 1, characterized in that: The heat storage unit comprises: A low-temperature tank (33) stores a heat storage medium therein, wherein the outlet of the low-temperature tank (33) is connected to the first inlet of the cooler (31), and the first inlet of the low-temperature tank (33) is connected to the first outlet of the heater (41); A high-temperature tank (34), the inlet of which is connected to the first outlet of the cooler (31), and the first outlet of the high-temperature tank (34) is connected to the first inlet of the heater (41); A heat supply heat exchanger (35) has a first inlet connected to the second outlet of the high-temperature tank (34), and a first outlet of the heat supply heat exchanger (35) is connected to the second inlet of the low-temperature tank (33). The heat supply heat exchanger (35) is used to utilize the heat in the heat storage medium to provide heat to the user side.

3. The centralized carbon dioxide energy storage system in a central urban area according to claim 1, characterized in that: The cold storage unit comprises: A cold storage tank (44) stores a cold storage medium therein, wherein the cold storage medium is water. The inlet of the cold storage tank (44) is connected to the first outlet of the reheater (43), and the first inlet of the reheater (43) is connected to a water source. The refrigeration heat exchanger (45) has a first inlet connected to the outlet of the cold storage tank (44), and a first outlet of the refrigeration heat exchanger (45) is connected to the outside world. The refrigeration heat exchanger (45) is used to utilize the cold energy in the water to provide cooling for the user side.

4. The centralized carbon dioxide energy storage system in a central urban area according to claim 1, characterized in that: The first inlet of the condenser (32) is connected to a water source, and the first outlet of the condenser (32) is connected to a first storage tank (36). The condenser (32) is used to cool the carbon dioxide after heat exchange using water, and store the water with increased temperature in the first storage tank (36). The first storage tank (36) is used to use the heat in the water to provide heat to the user side.

5. The centralized carbon dioxide energy storage system in a central urban area according to claim 1, characterized in that: The first inlet of the evaporator (40) is connected to a water source, and the first outlet of the evaporator (40) is connected to the inlet of a second storage tank (46). The evaporator (40) is used to use water to exchange heat with liquid carbon dioxide, so that the water temperature is reduced and then stored in the second storage tank (46). The second storage tank (46) is used to use the coldness in the water to provide cooling for the user side.

6. The centralized carbon dioxide energy storage system in a central urban area according to claim 1, characterized in that: The gas storage reservoir (2) is connected to a carbon capture device (1), and the carbon capture device (1) is used to capture gaseous carbon dioxide in industrial waste gas and store the captured gaseous carbon dioxide in the gas storage reservoir (2).

7. A centralized carbon dioxide energy storage method in a central urban area, characterized in that: The system according to claim 1 comprises the following steps: The normal temperature and pressure carbon dioxide in the gas storage reservoir (2) is introduced into the compressor (30) for compression, and the normal temperature and pressure carbon dioxide is converted into high temperature and high pressure carbon dioxide. The high temperature and high pressure carbon dioxide enters the cooler (31) and performs heat exchange with the heat storage medium from the heat storage unit, and the high temperature and high pressure carbon dioxide is converted into normal temperature and high pressure carbon dioxide. After the heat storage medium is heated, the heat stored in it is used to provide heat to the user side. The normal temperature and high pressure carbon dioxide enters the condenser (32) for cooling, and the normal temperature and high pressure carbon dioxide is converted into liquid carbon dioxide and stored in the liquid storage tank (3), completing energy storage and heat supply; The liquid carbon dioxide in the liquid storage tank (3) is introduced into the evaporator (40) for heat exchange, so that the liquid carbon dioxide becomes normal temperature and high pressure carbon dioxide. The normal temperature and high pressure carbon dioxide enters the heater (41) and exchanges heat with the heat storage medium of the heat storage unit. The normal temperature and high pressure carbon dioxide becomes high temperature and high pressure carbon dioxide. The high temperature and high pressure carbon dioxide enters the turbine (42) and expands to drive the generator to generate electricity and supply the generated electricity to the user side. After the high temperature and high pressure carbon dioxide expands and does work, it becomes low temperature and normal pressure carbon dioxide. The low temperature and normal pressure carbon dioxide enters the reheater (43) and exchanges heat with the cold storage medium in the cold storage unit. The low temperature and normal pressure carbon dioxide becomes normal temperature and normal pressure carbon dioxide and is stored in the gas storage reservoir (2). After the cold storage medium is cooled, the stored cold is used to supply cold to the user side, completing energy release, power supply and cold supply.

8. The centralized carbon dioxide energy storage method in a central urban area according to claim 7, characterized in that: The temperature of the high-temperature and high-pressure carbon dioxide is 200°C~250°C and the pressure is 5.0MPa~7.3MPa, the pressure of the normal-temperature and high-pressure carbon dioxide is 5.0MPa~7.3MPa, the temperature of the liquid carbon dioxide is 14.0°C~30.5°C and the pressure is 5.0MPa~7.3MPa, and the temperature of the low-temperature and normal-pressure carbon dioxide is -10°C~5°C.

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