Carbon dioxide transcritical cycle comprehensive energy storage device
Through the integrated energy storage device of carbon dioxide transcritical cycle, the problem of large energy conversion loss in the existing technology is solved, and efficient storage and conversion of cold, heat and electricity is achieved, adapting to the hot and cold needs of different application areas and reducing energy surplus.
Patent Information
- Application Number
- CN202422595349.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-25
- Publication Date
- 2025-07-22
- Estimated Expiration
- 2034-10-25
AI Technical Summary
The existing physical energy storage technology relies on geological conditions, and has large losses in the energy conversion process and dissipation of heat energy and cold volume, making it difficult to achieve efficient comprehensive storage and conversion of cold, heat and electricity.
The integrated energy storage device of carbon dioxide transcritical cycle is adopted to compress and expand carbon dioxide through booster components and expansion work components, heat exchangers are used to store heat and cold energy, and to operate alternately through positive and reverse cycles to achieve efficient conversion and storage of cold, heat and electricity.
It realizes efficient storage and conversion of cold, hot and electrical energy, reduces energy losses, flexibly allocates hot and cold demands, achieves dynamic energy balance, and adapts to the needs of different application areas.
Smart Images
Figure CN223136221U_ABST
Abstract
Description
Technical Field
[0001] The utility model specifically relates to the technical field of energy, specifically a carbon dioxide transcritical cycle integrated energy storage device. Background Technique
[0002] The carbon dioxide transcritical cycle is a special thermal cycle process. It takes electric energy as the input form, cold and heat energy as the storage forms, and cold, heat, electric energy and other forms of energy as the output forms, realizing the comprehensive storage of cold, heat and electricity, multi-energy combined supply and efficient conversion;
[0003] Traditional pumped-storage and compressed air energy storage technologies usually rely on geological conditions to convert potential energy into electric energy. This method is not only limited by geographical conditions and has high construction costs, but also has large energy losses in the energy conversion process.
[0004] However, existing physical energy storage technologies usually rely on geological conditions and mainly store potential energy and kinetic energy such as potential difference and pressure difference. These forms of energy are difficult to be directly and efficiently utilized by humans and must be converted through multiple conversions of electric energy - potential energy - electric energy, resulting in large energy losses in the energy conversion process. For example, pumped-storage energy storage and compressed air energy storage mainly applied to the power generation side, and flywheel energy storage mostly used on the grid side. In addition, existing thermal energy storage technologies require two sets of systems to store cold or heat separately, resulting in problems such as dissipation of thermal energy and cold energy and lack of electricity storage function. Content of the Utility Model
[0005] The purpose of the utility model is to provide a carbon dioxide transcritical cycle integrated energy storage device, which takes electric energy as the input form, cold and heat energy as the storage forms, and cold, heat, electric energy and other forms of energy as the output forms, providing users with an efficient integrated energy of cold, heat and electricity, and realizing the efficient storage and conversion of energy through the alternating operation of coupling the positive cycle and the reverse cycle, so as to solve the technical problems proposed in the above background technique.
[0006] To achieve the above purpose, the utility model provides the following technical solutions:
[0007] The carbon dioxide transcritical cycle integrated energy storage device includes a platform, on which a pressurizing component is fixedly connected. An electric motor providing power is arranged at the end of the pressurizing component, and the output shaft of the electric motor is in transmission connection with the input shaft of the pressurizing component through a coupling;
[0008] An expansion work component corresponding to the pressurizing component is also fixedly connected to the platform. A generator for converting energy is arranged on the side of the expansion work component, and the input shaft of the generator is in transmission connection with the output shaft of the expansion work component through a coupling;
[0009] On both sides of the described platform, a low-temperature heat exchanger and a high-temperature heat exchanger are respectively fixedly connected, and a cooling pipeline and a heating pipeline are respectively symmetrically and fixedly connected to the low-temperature heat exchanger and the high-temperature heat exchanger.
[0010] As a further technical solution of the present utility model, a first compression pipeline is fixedly connected to the side of the pressurizing component, and the other end of the first compression pipeline is fixedly connected to the end of the high-temperature heat exchanger;
[0011] The pressurizing component is communicated with the high-temperature heat exchanger through the first compression pipeline.
[0012] As a further technical solution of the present utility model, a second compression pipeline is fixedly connected to the side of the pressurizing component away from the first compression pipeline, and the other end of the second compression pipeline is fixedly connected to the end of the low-temperature heat exchanger;
[0013] The pressurizing component is communicated with the low-temperature heat exchanger through the second compression pipeline.
[0014] As a further technical solution of the present utility model, a first expansion pipeline is fixedly connected to the end of the expansion work component, and the other end of the first expansion pipeline is fixedly connected to the end of the high-temperature heat exchanger away from the first compression pipeline;
[0015] The expansion work component is communicated with the high-temperature heat exchanger through the first expansion pipeline.
[0016] As a further technical solution of the present utility model, a second expansion pipeline is fixedly connected to the side of the expansion work component, and the other end of the second expansion pipeline is fixedly connected to the end of the low-temperature heat exchanger away from the second compression pipeline;
[0017] The expansion work component is communicated with the low-temperature heat exchanger through the second expansion pipeline.
[0018] As a further technical solution of the present utility model, a corresponding cold storage balance component and a heat storage balance component are respectively provided at the ends of the cooling pipeline away from the low-temperature heat exchanger and the heating pipeline away from the high-temperature heat exchanger.
[0019] As a further technical solution of the present utility model, the heat storage balance component includes a heat storage tank, a first valve, a first heat exchanger and a first pump. The heat storage tank is communicated with the first heat exchanger through a pipeline, and a first valve and a first pump are also fixedly connected to the pipeline;
[0020] The high-temperature heat exchanger is communicated with the heat storage tank through the heating pipeline.
[0021] As a further technical solution of the present utility model, the cold storage balance component includes a cold storage tank, a second valve, a second heat exchanger and a second pump. The cold storage tank is communicated with the second heat exchanger through a pipeline, and a second valve and a second pump are also fixedly connected to the pipeline;
[0022] The low-temperature heat exchanger is connected to the cold storage tank through a cooling pipeline.
[0023] Compared with the prior art, the beneficial effects of the present utility model are as follows:
[0024] 1. In the present utility model, the pressurizing component and the expansion work component respectively compress and expand carbon dioxide. Through the reverse cycle of the system, carbon dioxide is compressed and expanded, and the heat energy and cold energy generated during the compression and expansion of carbon dioxide in the cycle are stored by using a heat exchanger. The stored cold energy and heat energy can be used in other occasions;
[0025] 2. In the present utility model, the low-temperature heat exchanger and the expansion work component respectively exchange the excess cold energy and heat energy with carbon dioxide. Moreover, the energy in carbon dioxide is utilized by using the pressurizing component and the expansion work component. Through the forward cycle of the system, carbon dioxide is expanded, and the generator is driven to generate electricity during the expansion process, and the energy is converted into electrical energy for output. The output electrical energy can be used in other occasions;
[0026] 3. In the present utility model, when the heat energy is in excess, the heat storage medium can flow through the heat exchanger under the push of a pump by opening a valve, and exchange heat with the heat exchange medium at the hot end, releasing the excess heat energy into the environment. With the expansion of the application area, it is easier to achieve balance in the matching of cold and heat demands. The system can more flexibly allocate the cold and heat demands among users in the area. Utilizing the complementarity of demands is conducive to achieving dynamic balance of energy and reducing the situation of partial energy excess. Description of the Drawings
[0027] Figure 1 It is a schematic diagram of the carbon dioxide transcritical integrated energy storage technology of the present utility model.
[0028] Figure 2 It is a schematic diagram of the carbon dioxide transcritical reverse cycle in the present utility model.
[0029] Figure 3 It is a schematic diagram of the carbon dioxide transcritical forward cycle in the present utility model.
[0030] Figure 4 It is a schematic diagram of the usage state structure of the present utility model.
[0031] Figure 5 It is in the present utility model Figure 4 Another perspective view.
[0032] In the figure:
[0033] Low-temperature heat exchanger - 1, cooling supply pipeline - 11, pressurizing component - 2, first compression pipeline - 21, second compression pipeline - 22, electric motor - 3, high-temperature heat exchanger - 4, heat supply pipeline - 41, expansion work component - 5, first expansion pipeline - 51, second expansion pipeline - 52, generator - 6, platform - 7, heat storage tank - C1, first valve - C2, first heat exchanger - C3, first pump - C4, cold storage tank - D1, second valve - D2, second heat exchanger - D3, second pump - D4. Specific embodiments
[0034] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.
[0035] Please refer to Figures 1-5 , the embodiment of the present invention provides a carbon dioxide transcritical cycle integrated energy storage device, including a platform 7, a pressurizing component 2 fixedly connected to the platform 7, a power-providing electric motor 3 provided at the end of the pressurizing component 2, and the output shaft of the electric motor 3 is in transmission connection with the input shaft of the pressurizing component 2 through a coupling;
[0036] An expansion work component 5 corresponding to the pressurizing component 2 is also fixedly connected to the platform 7, a generator 6 for converting energy is provided on the side of the expansion work component 5, and the input shaft of the generator 6 is in transmission connection with the output shaft of the expansion work component 5 through a coupling;
[0037] On both sides of the platform 7, a low-temperature heat exchanger 1 and a high-temperature heat exchanger 4 are respectively fixedly connected, and a cooling supply pipeline 11 and a heat supply pipeline 41 are symmetrically and fixedly connected to the low-temperature heat exchanger 1 and the high-temperature heat exchanger 4 respectively.
[0038] In this embodiment, a first compression pipeline 21 is fixedly connected to the side of the pressurizing component 2, and the other end of the first compression pipeline 21 is fixedly connected to the end of the high-temperature heat exchanger 4;
[0039] The pressurizing component 2 is connected to the high-temperature heat exchanger 4 through the first compression pipeline 21.
[0040] In this embodiment, a second compression pipeline 22 is fixedly connected to the side of the pressurizing component 2 away from the first compression pipeline 21, and the other end of the second compression pipeline 22 is fixedly connected to the end of the low-temperature heat exchanger 1;
[0041] The pressurizing component 2 is connected to the low-temperature heat exchanger 1 through the second compression pipeline 22.
[0042] In this embodiment, a first expansion pipeline 51 is fixedly connected to the end of the expansion work component 5, and the other end of the first expansion pipeline 51 is fixedly connected to the end of the high-temperature heat exchanger 4 away from the first compression pipeline 21;
[0043] The expansion work component 5 is communicated with the high-temperature heat exchanger 4 through the first expansion pipeline 51.
[0044] In this embodiment, a second expansion pipeline 52 is fixedly connected to the side of the expansion work component 5, and the other end of the second expansion pipeline 52 is fixedly connected to the end of the low-temperature heat exchanger 1 away from the second compression pipeline 22;
[0045] The expansion work component 5 is communicated with the low-temperature heat exchanger 1 through the second expansion pipeline 52.
[0046] In this embodiment, a corresponding cold storage balance component and a heat storage balance component are respectively provided at the ends of the cooling pipeline 11 away from the low-temperature heat exchanger 1 and the heating pipeline 41 away from the high-temperature heat exchanger 4.
[0047] In this embodiment, the heat storage balance component includes a heat storage tank C1, a first valve C2, a first heat exchanger C3 and a first pump C4. The heat storage tank C1 is communicated with the first heat exchanger C3 through a pipeline, and a first valve C2 and a first pump C4 are also fixedly connected to the pipeline;
[0048] The high-temperature heat exchanger 4 is communicated with the heat storage tank C1 through the heating pipeline 41.
[0049] In this embodiment, the cold storage balance component includes a cold storage tank D1, a second valve D2, a second heat exchanger D3 and a second pump D4. The cold storage tank D1 is communicated with the second heat exchanger D3 through a pipeline, and a second valve D2 and a second pump D4 are also fixedly connected to the pipeline;
[0050] The low-temperature heat exchanger 1 is communicated with the cold storage tank D1 through the cooling pipeline 11.
[0051] By adopting the above technical solution, the high-temperature heat exchanger 4 sends thermal energy into the heat storage tank C1 through the heating pipeline 41 for storage. The thermal energy stored in the heat storage tank C1 can be used for heating users. When there is excess thermal energy, the first valve C2 can be opened, and the heat storage medium flows through the first heat exchanger C3 under the push of the first pump C4 and exchanges heat with the heat transfer medium at the hot end to release the excess thermal energy into the environment; on the contrary, when there is excess cold energy, the second valve D2 can be opened, so that the cold storage medium flows through the second heat exchanger D3 under the push of the second pump D4 and exchanges cold energy with the heat transfer medium at the cold end to release the excess cold energy into the environment. As the application area expands, it is easier to achieve balance in the matching of heating and cooling demands. Utilizing the complementarity of demands is conducive to achieving dynamic balance of energy and reducing the situation of partial energy surplus. Specific embodiments
[0053] Embodiment 1
[0054] Reverse cycle: The motor 3 drives the supercharging component 2 to rotate through a coupling. Carbon dioxide enters the supercharging component 2 from the low-temperature heat exchanger 1 through the second compression pipeline 22 for compression. The compressed carbon dioxide flows through the high-temperature heat exchanger 4 through the first compression pipeline 21 and exchanges heat with the energy storage medium. And the energy storage medium in the high-temperature heat exchanger 4 will store the heat energy into the heat storage tank C1 through the heat supply pipeline 41;
[0055] Then the compressed carbon dioxide enters the expansion work component 5 through the first expansion pipeline 51. The expansion work component 5 will expand the compressed carbon dioxide. The expanded carbon dioxide enters the low-temperature heat exchanger 1 through the second expansion pipeline 52 and exchanges heat with the energy storage medium. And the energy storage medium in the low-temperature heat exchanger 1 will store the cold energy into the cold storage tank D1 through the cold supply pipeline 11.
[0056] Embodiment 2
[0057] Forward cycle: The carbon dioxide working medium is pumped into the low-temperature heat exchanger 1 by the supercharging component for heat exchange. Subsequently, the carbon dioxide that absorbs heat and increases in temperature enters the expansion work component 5 through the pipeline and expands, driving the turbine in the expansion work component 5 to rotate, so that the expansion work component 5 drives the generator 6 to rotate for power generation. The low-temperature carbon dioxide working medium after the expansion process enters the high-temperature heat exchanger 4 for heat exchange, so that the heat energy is further cooled, and the carbon dioxide working medium condenses into a low-pressure cold working medium, completing the forward cycle, and converting the stored heat energy and cold energy into electrical energy output.
[0058] The working principle of the present utility model is: In the reverse cycle, the system converts the input electrical energy into cold energy and heat energy output and stores them. The supercharging component 2 is driven by the motor 3 to compress the carbon dioxide working medium at normal temperature and pressure to high temperature and high pressure. Subsequently, it enters the high-temperature heat exchanger 4 through the first compression pipeline 21 for heat exchange, converting electrical energy into heat energy and storing it in the heat storage tank C1. The stored heat energy can be supplied to users subsequently. The carbon dioxide working medium with heat energy in the heat exchange process enters the expansion work component 5 through the second expansion pipeline 52 for expansion. The low-temperature and low-pressure carbon dioxide working medium exchanges heat through the low-temperature heat exchanger 1, converting electrical energy into cold energy and storing it in the cold storage tank 8. The stored cold energy can be supplied to users subsequently;
[0059] When there is an excess of thermal energy, the first valve C2 can be opened, and the heat storage medium flows through the first heat exchanger C3 under the drive of the first pump C4, and exchanges heat with the heat exchange medium at the hot end to release the excess thermal energy into the environment; conversely, when there is an excess of cold energy, the second valve D2 can be opened to allow the cold storage medium to flow through the second heat exchanger D3 under the drive of the second pump D4, and exchange cold energy with the heat exchange medium at the cold end to release the excess cold energy into the environment. With the expansion of the application area, it is easier to achieve balance in the matching of heating and cooling demands. Utilizing the complementarity of demands is conducive to achieving dynamic energy balance and reducing the situation of partial energy excess.
[0060] For those skilled in the art, it is obvious that the present utility model is not limited to the details of the above exemplary embodiments, and the present utility model can be implemented in other specific forms without departing from the spirit or basic characteristics of the present utility model. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present utility model is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be encompassed within the present utility model. Any reference signs in the claims should not be regarded as limiting the claims involved.
[0061] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.
Claims
1. Carbon dioxide transcritical cycle integrated energy storage device, characterized in that: It includes a platform (7), on which a pressurizing component (2) is fixedly connected. At the end of the pressurizing component (2), there is a motor (3) providing power, and the output shaft of the motor (3) is in transmission connection with the input shaft of the pressurizing component (2) through a coupling; On the platform (7), there is also a fixedly connected expansion work component (5) corresponding to the pressurizing component (2). On the side of the expansion work component (5), there is a generator (6) for converting energy, and the input shaft of the generator (6) is in transmission connection with the output shaft of the expansion work component (5) through a coupling; On both sides of the platform (7), a low-temperature heat exchanger (1) and a high-temperature heat exchanger (4) are respectively fixedly connected, and a cold supply pipe (11) and a heat supply pipe (41) are symmetrically and fixedly connected to the low-temperature heat exchanger (1) and the high-temperature heat exchanger (4) respectively.
2. The integrated energy storage device based on the carbon dioxide transcritical cycle according to claim 1, wherein: On the side of the pressurizing component (2), a first compression pipe (21) is fixedly connected, and the other end of the first compression pipe (21) is fixedly connected to the end of the high-temperature heat exchanger (4); The pressurizing component (2) is connected to the high-temperature heat exchanger (4) through the first compression pipe (21).
3. The integrated energy storage device with a carbon dioxide transcritical cycle according to claim 2, wherein: On the side of the pressurizing component (2) away from the first compression pipe (21), a second compression pipe (22) is fixedly connected, and the other end of the second compression pipe (22) is fixedly connected to the end of the low-temperature heat exchanger (1); The pressurizing component (2) is connected to the low-temperature heat exchanger (1) through the second compression pipe (22).
4. The integrated energy storage device based on the carbon dioxide transcritical cycle according to claim 1, wherein: At the end of the expansion work component (5), a first expansion pipe (51) is fixedly connected, and the other end of the first expansion pipe (51) is fixedly connected to the end of the high-temperature heat exchanger (4) away from the first compression pipe (21); The expansion work component (5) is connected to the high-temperature heat exchanger (4) through the first expansion pipe (51).
5. The integrated energy storage device with a carbon dioxide transcritical cycle according to claim 4, characterized in that: On the side of the expansion work component (5), a second expansion pipe (52) is fixedly connected, and the other end of the second expansion pipe (52) is fixedly connected to the end of the low-temperature heat exchanger (1) away from the second compression pipe (22); The expansion work component (5) is connected to the low-temperature heat exchanger (1) through the second expansion pipe (52).
6. The integrated energy storage device based on carbon dioxide transcritical cycle according to claim 1, wherein: At the ends of the cold supply pipe (11) away from the low-temperature heat exchanger (1) and the heat supply pipe (41) away from the high-temperature heat exchanger (4), there are respectively corresponding cold storage balance components and heat storage balance components.
7. The integrated energy storage device based on the carbon dioxide transcritical cycle according to claim 6, characterized in that: The heat storage balance component includes a heat storage tank (C1), a first valve (C2), a first heat exchanger (C3) and a first pump (C4). The heat storage tank (C1) is connected to the first heat exchanger (C3) through a pipe, and a first valve (C2) and a first pump (C4) are also fixedly connected to the pipe; The high-temperature heat exchanger (4) is connected to the heat storage tank (C1) through the heat supply pipe (41).
8. The integrated energy storage device based on the carbon dioxide transcritical cycle according to claim 6, wherein: The cold storage balance component includes a cold storage tank (D1), a second valve (D2), a second heat exchanger (D3) and a second pump (D4). The cold storage tank (D1) is connected to the second heat exchanger (D3) through a pipe, and a second valve (D2) and a second pump (D4) are also fixedly connected to the pipe; The low-temperature heat exchanger (1) is connected to the cold storage tank (D1) through a cooling supply pipe (11).