A centralized carbon dioxide energy storage system in a central city and a method thereof

Abstract

The application belongs to the technical field of energy storage, and relates to a centralized carbon dioxide energy storage system for central urban areas and a method thereof, comprising a storage module, an energy storage and heating module, a power supply and cooling supply module in energy release, wherein the energy storage and heating module comprises a heat storage unit and a compressor, a cooler and a condenser connected in sequence; the power supply and cooling supply module in energy release comprises a cold storage unit and an evaporator, a heater, a turbine and a reheater connected in sequence. The application can set the storage module with the largest occupation area away from the community, set the energy storage and heating module and the power supply and cooling supply module in energy release at the user side, utilize long-distance transportation of carbon dioxide, realize centralized storage of working medium and distributed supply of energy, enable the system to cover all energy units in a large range, and greatly reduce the loss in the energy transmission process, thereby not only reducing the energy waste during power supply, heating and cooling, but also significantly improving the comprehensive energy utilization efficiency of the system.

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:

[0006] A centralized carbon dioxide energy storage system in a central urban area, comprising:

[0007] 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.

[0008] 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.

[0009] The energy-releasing power and cooling module is arranged at the user side, and the energy-releasing power and cooling module comprises a cold energy storage unit and, sequentially connected, an evaporator, a heater, a turbine and a reheater, the evaporator is connected with a liquid storage tank, the reheater is connected with a gas storage tank, the heater is connected with a heat storage unit, the reheater is connected with the cold energy storage unit, the evaporator is used for changing 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 for expanding the gaseous carbon dioxide after heating to drive the generator to generate power and supply the generated power to the user side, the reheater is connected with the cold energy storage unit, and the reheater is used for exchanging heat between the gaseous carbon dioxide after expansion and the cold storage medium in the cold energy storage unit to store the cold energy in the gaseous carbon dioxide after expansion in the cold energy storage unit, the cold energy storage unit is used for supplying cold energy to the user side, and the gaseous carbon dioxide after heat exchange is stored in the gas storage tank.

[0010] The application also has the characteristics that:

[0011] The low-temperature tank has a heat storage medium stored therein, the outlet of the low-temperature tank is connected with the first inlet of the cooler, and the first inlet of the low-temperature tank is connected with the first outlet of the heater.

[0012] The high-temperature tank has an inlet connected with the first outlet of the cooler, and the first outlet of the high-temperature tank is connected with the first inlet of the heater.

[0013] The heat supply heat exchanger has a first inlet connected with the second outlet of the high-temperature tank, and a first outlet connected with the second inlet of the low-temperature tank, and is used for supplying heat to the user side by using the heat in the heat storage medium.

[0014] The cold energy storage unit comprises:

[0015] The cold storage tank has a cold storage medium stored therein, the cold storage medium is water, the inlet of the cold storage tank is connected with the first outlet of the reheater, and the first inlet of the reheater is connected with a water source.

[0016] The refrigeration heat exchanger has a first inlet connected with the outlet of the cold storage tank, and a first outlet connected with the outside, and is used for supplying cold energy to the user side by using the cold energy in the water.

[0017] The first inlet of the condenser is connected with a water source, the first outlet of the condenser is connected with a first storage tank, the condenser is used for cooling the carbon dioxide after heat exchange by using water, and the water with the temperature increased is stored in the first storage tank, and the first storage tank is used for supplying heat to the user side by using the heat in the water.

[0018] 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.

[0019] 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.

[0020] A centralized carbon dioxide energy storage method in a central urban area comprises the following steps:

[0021] 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.

[0022] 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.

[0023] 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℃.

[0024] The central urban area centralized carbon dioxide energy storage system and method of the present invention have the following advantages:

[0025] 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

[0026] Figure 1 This is the overall layout diagram of the system of the present invention.

[0027] Figure 2 This is a schematic structural diagram of the heat storage and energy supply module in the present invention.

[0028] Figure 3 It is a structural diagram of the energy-releasing power supply and cooling module in the present invention.

[0029] Figure 4 It is a schematic diagram of the overall process of the present invention.

[0030] Reference numerals:

[0031] 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

[0032] 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.

[0033] 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.

[0034] 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.

[0035] 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.

[0036] 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.

[0037] 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.

[0038] 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.

[0039] 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.

[0040] 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.

[0041] 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.

[0042] 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 .

[0043] 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:

[0044] 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.

[0045] 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.

[0046] 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.

[0047] Working principle:

[0048] 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.

[0049] When the user side has a lower temperature hot water washing, washing and other low temperature heating demand, the signal processing center 50 receives the user side control signal and controls to close the first control valve 51, the second control valve 52, opens the third control valve 53, the water stored in the first storage tank 36 is used to supply the user side. When the user side has a higher temperature heating demand, the signal processing center 50 controls to close the third control valve 53, opens the second control valve 51, the second control valve 52, the normal temperature water of the user side enters the heat supply heat exchanger 35 and exchanges heat with the heat storage medium from the high temperature tank 34 to increase the temperature, the generated high temperature water is used for heating the user side, and the heat storage medium is returned to the low temperature tank 33 for storage. The signal processing center 50 can flexibly adjust the opening of the first control valve 51 and the second control valve 52 according to the actual heating power and temperature demand of the user side, so as to control the flow of water in the heat supply heat exchanger 35, realize the control of power and temperature.

[0050] When the user side only has power demand, the signal processing center 50 controls to close 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 storage tank 3 is delivered to the user side through the liquid main line to supply power and cooling module. The liquid carbon dioxide enters the evaporator 40 and exchanges heat with the normal temperature water. The liquid carbon dioxide becomes gaseous normal temperature high pressure carbon dioxide, and the normal temperature water is stored in the second storage tank 46 after the temperature is reduced. The normal temperature high pressure carbon dioxide enters the heater 41 and exchanges heat with the heat storage medium from the high temperature tank 34 to increase the temperature. The heat storage medium is stored in the low temperature tank 33 after the temperature is reduced. The normal temperature high pressure carbon dioxide becomes high temperature high pressure carbon dioxide and enters the turbine 42 to expand and do work to drive the generator to generate electricity and supply power to the user side. The high temperature high pressure carbon dioxide becomes low temperature normal pressure carbon dioxide after expansion and work. The low temperature normal pressure carbon dioxide enters the reheater 43 and exchanges heat with the normal temperature water. The low temperature normal pressure carbon dioxide becomes normal temperature normal pressure carbon dioxide and is delivered to the gas storage 2 through the gas main line. The normal temperature water becomes cold water and is stored in the cold storage tank 44.

[0051] When the user side has a lower temperature cooling demand, the signal processing center 50 controls to close the seventh control valve 57 and the eighth control valve 58, and opens the sixth control valve 56 to supply cold to the user side by using the cold in the water stored in the second storage tank 46. When the user side has a lower temperature cooling demand, the signal processing center 50 controls to close the sixth control valve 56, and opens the seventh control valve 57 and the eighth control valve 58. The normal temperature water output by the user side enters the refrigeration heat exchanger 45 and exchanges heat with the cold water from the cold storage tank 44. The normal temperature water is supplied to the user side after the temperature is reduced, and the heat absorbing and temperature increasing cold water is discharged to the environment or recycled. The signal processing center 50 can flexibly adjust the opening of the seventh control valve 57 and the eighth control valve 58 according to the actual cooling temperature demand of the user side, so as to control the flow of water in the refrigeration heat exchanger 45 and realize the control of the cooling temperature.

[0052] The central city centralized carbon dioxide energy storage system and method of the present application has other advantages as follows:

[0053] First, the present application places the storage unit in a location away from the city and close to a large carbon emission source such as a factory, which can save carbon dioxide on site, allowing the carbon capture device to quickly capture a large amount of carbon dioxide, saving the cost of carbon dioxide transportation, improving the efficiency of carbon dioxide collection, and reducing the adverse effects on the central city.

[0054] Second, the conventional energy storage system only considers single power output, and the present application can realize the coordinated supply of heat, electricity and cold based on the actual power supply, cooling, heating, demand of users, and meet the energy demand of users in various application scenarios. At the same time, the system can realize the energy demand of users in various application scenarios according to the energy demand of different time periods and different intensities through flexible module combination and regulation mechanism.

[0055] Third, the present application can realize the energy demand of users in various application scenarios according to the energy demand of different time periods and different intensities through flexible module combination and joint regulation of multiple control valves, and can adjust the output ratio of the three kinds of energy and the supply temperature of cold and heat according to the actual demand, greatly improving the flexibility of the system. For example, in hot summer, the system can strengthen the refrigeration function, and reasonably allocate electric energy and waste heat resources; in cold winter, it focuses on heating, and also considers power supply. Through such design, the adaptability of the system is effectively improved, which can seamlessly connect the diversified needs of users in various scenarios.

[0056] Fourth, the present application can comprehensively utilize sensible heat and latent heat to ensure sufficient energy supply and improve energy utilization rate. Under the traditional energy utilization architecture, the energy conversion and utilization mode is relatively single, it is difficult to fully tap the potential of energy, resulting in non-negligible energy loss. Compared with the traditional energy utilization architecture, the present application innovatively utilizes sensible heat and latent heat. During the system operation, carbon dioxide is used as the core working medium. In 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 is accumulated. With the help of the condenser, the sensible heat is transferred to the circulating water in the form of heat exchange, and the generated heat accurately matches the heating demand of residents, commercial hot water supply and other heat demand, realizing efficient resource utilization of sensible heat. In the evaporator link, liquid carbon dioxide undergoes gasification phase change, which absorbs a large amount of environmental heat, which is essentially an effective utilization of latent heat, thereby achieving efficient refrigeration effect. In different stages of energy storage and release, the change of sensible heat and latent heat associated with the state of carbon dioxide is accurately captured and fully utilized through the carefully designed heat exchange network and energy recovery system.

[0057] 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; 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. A refrigeration heat exchanger (45), wherein a first inlet is connected to an 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 to the user side; 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.

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 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.

4. 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).

5. 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.

6. A centralized carbon dioxide energy storage method in a central urban area according to claim 5, 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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