Energy storage power generation system

Abstract

The invention relates to an energy storage power generation system. The energy storage power generation system comprises a first container, a second container, at least two heat exchangers, a compressor unit, a turbine unit and a generator. The first containing cavity communicates with an air inlet of the compressor unit, an air outlet of the compressor unit communicates with inlets of the first heat exchange channels of the at least two heat exchangers in sequence, and outlets of the first heat exchange channels of the at least two heat exchangers communicate with the second containing cavity in sequence. The second containing cavity sequentially communicates with inlets of the second heat exchange channels of the at least two heat exchangers. Outlets of the second heat exchange channels of the at least two heat exchangers communicate with an air inlet of the turbine unit in sequence. An air outlet of the turbine unit communicates with the first containing cavity. The first container is arranged underground, and the first container or more first containers with larger volume can be selected under the condition that the occupied area of the ground is not changed, so that the energy storage scale of the energy storage power generation system is favorably improved.

Description

Technical Field

[0001] This application relates to the field of power generation technology, and in particular to an energy storage power generation system. Background Technology

[0002] A power generation system typically includes a turbine and a generator. The working fluid of the turbine can be a gas, and the turbine expands the working fluid to do work, thereby driving the generator to generate electricity.

[0003] However, the power generation system in the relevant technology is limited by the area it occupies, which also limits the energy storage capacity of the power generation system in the relevant technology. Summary of the Invention

[0004] Therefore, it is necessary to address the issue of limited energy storage capacity in power generation systems in related technologies by providing an energy storage power generation system that can increase the energy storage capacity of the system without changing the ground footprint.

[0005] According to a first aspect of this application, an energy storage power generation system is provided, comprising:

[0006] The first container has a first receiving cavity for storing the gaseous working fluid;

[0007] The second container has a second receiving cavity for storing the liquid working fluid;

[0008] At least two heat exchangers, each heat exchanger having a first heat exchange channel and a second heat exchange channel for exchanging heat with the first heat exchange channel;

[0009] A compressor unit has an air inlet and an air outlet; a first receiving cavity is connected to the air inlet of the compressor unit, the air outlet of the compressor unit is sequentially connected to the inlet of the first heat exchange channel of at least two heat exchangers, and the outlet of the first heat exchange channel of at least two heat exchangers is sequentially connected to the second receiving cavity; the at least two heat exchangers are used to condense the working fluid flowing to the second container into a liquid working fluid;

[0010] A turbine unit has an inlet and an outlet; a second receiving cavity is sequentially connected to the inlets of the second heat exchange channels of at least two of the heat exchangers; the outlets of the second heat exchange channels of at least two of the heat exchangers are sequentially connected to the inlet of the turbine unit; the outlet of the turbine unit is connected to the first receiving cavity; the at least two heat exchangers are further used to vaporize the working fluid flowing out of the second container into a gaseous working fluid; and

[0011] A generator is connected to the turbine unit, which drives the generator to generate electricity.

[0012] The first container is located underground, while the second container, at least two heat exchangers, the compressor unit, the turbine unit, and the generator are all located on the ground.

[0013] According to a second aspect of this application, an energy storage power generation system is provided, comprising:

[0014] The first container has a first receiving cavity for storing the gaseous working fluid;

[0015] The second container has a second receiving cavity for storing the liquid working fluid;

[0016] At least two heat exchangers, the at least two heat exchangers including at least one first heat exchanger and at least one second heat exchanger; the first heat exchanger has a first heat exchange channel and a second heat exchange channel for exchanging heat with the first heat exchange channel; the second heat exchanger has a third heat exchange channel and a fourth heat exchange channel for exchanging heat with the third heat exchange channel.

[0017] A compressor unit has an air inlet and an air outlet; a first receiving cavity is connected to the air inlet of the compressor unit, the air outlet of the compressor unit is connected to the inlet of the first heat exchange channel of the first heat exchanger, and the outlet of the first heat exchange channel of the first heat exchanger is connected to the second receiving cavity; the at least one first heat exchanger is used to condense the working fluid flowing to the second container into a liquid working fluid.

[0018] A heat storage container; the heat storage container is connected to the second heat exchange channel of all the first heat exchangers and the fourth heat exchange channel of all the second heat exchangers respectively, so as to receive the working fluid flowing out of the second heat exchange channel of all the first heat exchangers, and to supply the working fluid to the fourth heat exchange channel of all the second heat exchangers.

[0019] A turbine unit has an inlet and an outlet; a second receiving cavity is connected to the inlet of the third heat exchange channel of all the second heat exchangers, and the outlet of the third heat exchange channel of all the second heat exchangers is connected to the inlet of the turbine unit; the outlet of the turbine unit is connected to the first receiving cavity; the at least one second heat exchanger is used to vaporize the working fluid flowing out of the second container into a gaseous working fluid; and

[0020] A generator is connected to the turbine unit, which drives the generator to generate electricity.

[0021] The first container is located underground, while the second container, at least two heat exchangers, the heat storage container, the compressor unit, the turbine unit, and the generator are all located on the ground.

[0022] In one embodiment, the outlet of the fourth heat exchange channel of the second heat exchanger is connected to the inlet of the second heat exchange channel of the first heat exchanger.

[0023] In one embodiment, the energy storage power generation system includes a plurality of the first containers;

[0024] The first receiving cavities of multiple first containers are connected in parallel to the air inlet of the compressor unit;

[0025] The first receiving cavities of multiple first containers are connected in parallel to the air outlet of the turbine unit.

[0026] In one embodiment, the energy storage power generation system further includes a first pipe, a second pipe, a third pipe, a first valve, and a second valve;

[0027] The first receiving cavities of multiple first containers are connected in parallel to the first pipe;

[0028] The first pipe is connected to the air inlet of the compressor unit via the second pipe;

[0029] The first pipe is connected to the air outlet of the turbine unit through the third pipe;

[0030] The first valve is installed on the second pipeline;

[0031] The second valve is located on the third pipeline.

[0032] In one embodiment, the energy storage power generation system further includes:

[0033] The first pump is used to pump the working fluid flowing to the second container;

[0034] The second pump is used to pump the working fluid out of the second container.

[0035] In one embodiment, the first container is an underground mine shaft, an underground salt cavern, or a flexible airbag; and / or

[0036] The first container is used to store the working fluid at normal temperature and pressure.

[0037] In one embodiment, the energy storage power generation system further includes an electric motor and a power supply;

[0038] The power supply is electrically connected to the motor to supply power to the motor;

[0039] The generator is electrically connected to the power supply to store electrical energy in the power supply.

[0040] The electric motor is connected to the compressor unit to drive the compressor unit.

[0041] In one embodiment, the energy storage power generation system includes a plurality of the second containers;

[0042] The second receiving cavities of a plurality of second containers are arranged in parallel and are sequentially connected to the outlets of the first heat exchange channels of at least two of the heat exchangers;

[0043] The second containment cavities of a plurality of second containers are arranged in parallel and are sequentially connected to the inlet of the second heat exchange channel of at least two of the heat exchangers.

[0044] In one embodiment, the at least two heat exchangers include two first heat exchangers and one second heat exchanger;

[0045] The first heat exchange channel of one of the first heat exchangers, the first heat exchange channel of the second heat exchanger, and the first heat exchange channel of the other first heat exchanger are connected in series.

[0046] The second heat exchange channel of one of the first heat exchangers, the second heat exchange channel of the second heat exchanger, and the second heat exchange channel of the other first heat exchanger are connected in series.

[0047] In the technical solution of this application, since the first container is located underground, while the second container, at least two heat exchangers, compressor unit, turbine unit, and generator are all located on the ground, the first container for storing the gaseous working fluid has a larger volume than the second container used to store the liquid working fluid. By placing the larger first container underground, it is possible to select a larger first container or more first containers without changing the ground area occupied, thus increasing the energy storage capacity of the energy storage power generation system. Furthermore, storing the gaseous working fluid underground avoids human contact with the first container, thereby improving the safety of the energy storage power generation system. In addition, this application can also realize the application of energy storage power generation systems with larger gas storage capacity (e.g., 6 million cubic meters), improving the feasibility of energy storage power generation systems. Attached Figure Description

[0048] Figure 1 A schematic diagram of the structure of an energy storage power generation system according to an embodiment of this application is shown.

[0049] Figure 2 A schematic diagram of the structure of an energy storage power generation system according to another embodiment of this application is shown.

[0050] Figure 3 A schematic diagram of the turbine and regenerator in one embodiment of this application is shown.

[0051] Reference numerals: 10, Energy storage and power generation system; 110, First container; 120, Second container; 210, Heat exchanger; 211, First heat exchanger; 212, Second heat exchanger; 220, Thermal storage container; 300, Compressor unit; 400, Turbine unit; 410, Turbine; 420, Regenerator; 500, Generator; 610, First pipeline; 620, Second pipeline; 630, Third pipeline; 640, Fourth pipeline; 650, Fifth pipeline; 710, First valve; 720, Second valve; 730, Third valve; 740, Fourth valve; 810, First pump; 820, Second pump; 900, Electric motor; Q1, First receiving cavity; Q2, Second receiving cavity; H1, First heat exchange channel; H2, Second heat exchange channel; H3, Third heat exchange channel; H4, Fourth heat exchange channel; H5, Fifth heat exchange channel; H6, Sixth heat exchange channel. Detailed Implementation

[0052] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0053] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0054] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0055] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0056] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0057] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0058] Figure 1 A schematic diagram of the structure of an energy storage power generation system 10 according to an embodiment of this application is shown.

[0059] Please see Figure 1 One embodiment of this application provides an energy storage power generation system 10, including a first container 110, a second container 120, at least two heat exchangers 210, a compressor unit 300, a turbine unit 400, and a generator 500.

[0060] The first container 110 has a first cavity Q1 for storing a gaseous working medium, and the second container 120 has a second cavity Q2 for storing a liquid working medium. The working medium may be carbon dioxide or air.

[0061] Heat exchanger 210 has a first heat exchange channel H1 and a second heat exchange channel H2 for exchanging heat with the first heat exchange channel H1. Compressor unit 300 has an inlet and an outlet. First receiving cavity Q1 is connected to the inlet of compressor unit 300. The outlet of compressor unit 300 is sequentially connected to the inlet of the first heat exchange channel H1 of at least two heat exchangers 210. The outlet of the first heat exchange channel H1 of at least two heat exchangers 210 is sequentially connected to the second receiving cavity Q2. At least two heat exchangers 210 are used to condense the working fluid flowing to the second container 120 into a liquid working fluid.

[0062] The turbine unit 400 has an inlet and an outlet. The second receiving cavity Q2 is sequentially connected to the inlet of the second heat exchange channel H2 of at least two heat exchangers 210. The outlet of the second heat exchange channel H2 of at least two heat exchangers 210 is sequentially connected to the inlet of the turbine unit 400. The outlet of the turbine unit 400 is connected to the first receiving cavity Q1. The at least two heat exchangers 210 are also used to vaporize the working fluid flowing out of the second container 120 into a gaseous working fluid.

[0063] Generator 500 is connected to turbine unit 400, which is used to drive generator 500 to generate electricity.

[0064] The energy storage and power generation system 10 of this application operates as follows: The gaseous working fluid (such as air or carbon dioxide) in the first containment chamber Q1 flows into the compressor unit 300. The compressor unit 300 compresses this gaseous working fluid, generating heat during the compression process (forming compression heat). This allows high-temperature gaseous working fluid to flow out from the outlet of the compressor unit 300. This high-temperature gaseous working fluid sequentially flows into the first heat exchange channel H1 of at least two heat exchangers 210 and then into the second containment chamber Q2. Conversely, the liquid working fluid (at a lower temperature) in the second containment chamber Q2 sequentially flows into the second heat exchange channel H2 of at least two heat exchangers 210. The working fluid can exchange heat in at least two heat exchangers 210, allowing the gaseous working fluid flowing from the first heat exchange channel H1 of the heat exchanger 210 to the second receiving cavity Q2 to condense into a liquid working fluid. Alternatively, the liquid working fluid flowing from the first heat exchange channel H1 of the heat exchanger 210 to the second receiving cavity Q2 can pass through the second heat exchange channel H2 of at least two heat exchangers 210 and absorb the heat of compression to vaporize into a gaseous working fluid. Afterward, the vaporized working fluid can flow into the turbine unit 400 and expand to do work through the turbine unit 400. During this process, the turbine unit 400 can drive the generator 500 to generate electricity. In this way, the energy storage power generation system 10 can be used for cyclic power generation.

[0065] Since the first container 110 is located underground, while the second container 120, at least two heat exchangers 210, compressor unit 300, turbine unit 400, and generator 500 are all located above ground, the first container 110, which stores the gaseous working fluid, has a larger volume than the second container 120, which stores the liquid working fluid. By placing the larger first container 110 underground, it is possible to use a larger volume of first containers 110 or more first containers 110 without changing the ground area occupied, thus increasing the energy storage capacity of the energy storage power generation system 10. Furthermore, storing the gaseous working fluid underground avoids human contact with the first container 110, thereby improving the safety of the energy storage power generation system 10. In addition, this application can also realize the application of energy storage power generation systems 10 with larger gas storage capacity (e.g., 6 million cubic meters), improving the feasibility of the energy storage power generation system 10.

[0066] The heat exchanger 210, compressor unit 300, turbine unit 400 and generator 500 are located on the ground to facilitate their maintenance and repair.

[0067] Considering that liquid working fluids usually need to be stored in high-pressure tanks, the second container 120 is designed as a high-pressure container, and it is safer to place the second container 120 on the ground.

[0068] Figure 2 A schematic diagram of the structure of an energy storage power generation system 10 according to another embodiment of this application is shown.

[0069] Please see Figure 2 Another embodiment of this application provides an energy storage power generation system 10, including a first container 110, a second container 120, at least two heat exchangers 210, a heat storage container 220, a second compressor unit 300, a turbine unit 400, and a generator 500.

[0070] The first container 110 has a first cavity Q1 for storing a gaseous working medium, and the second container 120 has a second cavity Q2 for storing a liquid working medium. The working medium may be carbon dioxide or air.

[0071] At least two heat exchangers 210 include at least one first heat exchanger 211 and at least one second heat exchanger 212. The first heat exchanger 211 has a first heat exchange channel H1 and a second heat exchange channel H2 for exchanging heat with the first heat exchange channel H1. The second heat exchanger 212 has a third heat exchange channel H3 and a fourth heat exchange channel H4 for exchanging heat with the third heat exchange channel H3. The compressor unit 300 has an inlet and an outlet. A first receiving cavity Q1 is connected to the inlet of the compressor unit 300, and the outlet of the compressor unit 300 is connected to the inlet of the first heat exchange channel H1 of the first heat exchanger 211. The outlet of the first heat exchange channel H1 of the first heat exchanger 211 is connected to the second receiving cavity Q2. At least one first heat exchanger 211 is used to condense the working fluid flowing to the second container 120 into a liquid working fluid.

[0072] The heat storage container 220 is connected to the second heat exchange channel H2 of all the first heat exchangers 211 and the fourth heat exchange channel H4 of all the second heat exchangers 212, respectively, to receive the working fluid flowing out of the second heat exchange channel H2 of all the first heat exchangers 211, and to supply the working fluid to the fourth heat exchange channel H4 of all the second heat exchangers 212.

[0073] The turbine unit 400 has an inlet and an outlet. The second receiving cavity Q2 is connected to the inlet of the third heat exchange channel H3 of all the second heat exchangers 212. The outlets of the third heat exchange channels H3 of all the second heat exchangers 212 are sequentially connected to the inlet of the turbine unit 400. The outlet of the turbine unit 400 is connected to the first receiving cavity Q1. At least one second heat exchanger 212 is used to vaporize the working fluid flowing out of the second container 120 into a gaseous working fluid.

[0074] Generator 500 is connected to turbine unit 400, which is used to drive generator 500 to generate electricity.

[0075] Optionally, multiple first heat exchangers 211 may be provided, and the multiple first heat exchangers 211 may be arranged in series or in parallel.

[0076] Optionally, multiple second heat exchangers 212 may be provided, and the multiple second heat exchangers 212 may be arranged in series or in parallel.

[0077] The energy storage process of the energy storage power generation system 10 can be carried out when there is sufficient wind and solar resources and high power generation but low power consumption. The energy storage process of the energy storage power generation system 10 of this application is as follows: the gaseous working fluid (such as air or carbon dioxide) in the first containment chamber Q1 flows into the compressor unit 300. The compressor unit 300 compresses this gaseous working fluid. During the compression process, heat is generated (forming compression heat), so that high-temperature gaseous working fluid can flow out from the outlet of the compressor unit 300. This high-temperature gaseous working fluid will flow into the first heat exchange channel H1 of at least one first heat exchanger 211 and flow to the second containment chamber Q2. In addition, the working fluid in the second heat exchange channel H2 of the first heat exchanger 211 can absorb this compression heat and store the working fluid that has absorbed the compression heat in the heat storage container 220. This process is the process of converting electrical energy into the internal energy, pressure potential energy and thermal energy of the working fluid (such as air or carbon dioxide).

[0078] The energy storage power generation system 10 can release energy when wind and solar resources are scarce and power generation is low, but electricity consumption is high. The energy release process of the energy storage power generation system 10 in this application is as follows:

[0079] The liquid working fluid (lower temperature) in the second containment chamber Q2 flows into the third heat exchange channel H3 of the second heat exchanger 212. The working fluid (higher temperature) flowing from the heat storage container 220 into the fourth heat exchange channel H4 of the second heat exchanger 212 can exchange heat with the liquid working fluid (lower temperature) in the third heat exchange channel H3, causing the working fluid flowing from the third heat exchange channel H3 of the second heat exchanger 212 to the turbine unit 400 to vaporize into a gaseous working fluid. After that, the vaporized working fluid can flow into the turbine unit 400 and expand to do work through the turbine unit 400. During this process, the turbine unit 400 can drive the generator 500 to generate electricity. In this way, the energy storage power generation system 10 can be used for cyclic power generation.

[0080] Since the first container 110 is located underground, while the second container 120, at least two heat exchangers 210, the heat storage container 220, the compressor unit 300, the turbine unit 400, and the generator 500 are all located above ground, the first container 110, which stores the gaseous working fluid, has a larger volume than the second container 120, which stores the liquid working fluid. By placing the larger first container 110 underground, it is possible to use a larger volume of first containers 110 or more first containers 110 without changing the ground area occupied, thus increasing the energy storage capacity of the energy storage power generation system 10. Furthermore, storing the gaseous working fluid underground avoids human contact with the first container 110, thereby improving the safety of the energy storage power generation system 10. In addition, this application can also realize the application of energy storage power generation systems 10 with larger gas storage capacity (e.g., 6 million cubic meters), improving the feasibility of the energy storage power generation system 10.

[0081] The heat exchanger 210, compressor unit 300, turbine unit 400 and generator 500 are located on the ground to facilitate their maintenance and repair.

[0082] Considering that liquid working fluids usually need to be stored in high-pressure tanks, the second container 120 is designed as a high-pressure container, and it is safer to place the second container 120 on the ground.

[0083] Optionally, an insulation layer is provided on the outer wall of the heat storage container 220. The insulation layer is used to keep the working medium stored in the heat storage container 220 warm, so as to better utilize the working medium stored in the heat storage container 220 to vaporize the working medium flowing out of the second container 120.

[0084] Specifically, such as Figure 2 In the embodiment shown, the outlet of the fourth heat exchange channel H4 of the second heat exchanger 212 is connected to the inlet of the second heat exchange channel H2 of the first heat exchanger 211.

[0085] Thus, after the high-temperature working fluid in the fourth heat exchange channel H4 of the second heat exchanger 212 heats the working fluid flowing from the third heat exchange channel H3 of the second heat exchanger 212 to the turbine unit 400, the high-temperature working fluid in the fourth heat exchange channel H4 will cool down. The cooled working fluid can flow into the second heat exchange channel H2 of the first heat exchanger 211, so that the working fluid flowing from the first heat exchange channel H1 of the first heat exchanger 211 to the second receiving cavity Q2 will condense into a liquid working fluid. In this way, the use of cold storage containers can be reduced, thereby reducing the cost and ground area occupied by the energy storage power generation system 10.

[0086] In some embodiments, such as Figure 1 and Figure 2 As shown, the energy storage power generation system 10 includes a plurality of first containers 110, the first receiving cavities Q1 of the plurality of first containers 110 are connected in parallel to the air inlet of the compressor unit 300, and the first receiving cavities Q1 of the plurality of first containers 110 are connected in parallel to the air outlet of the turbine unit 400.

[0087] For example, the first container 110 has 4 or 5 containers.

[0088] Setting up multiple first containers 110 can increase the gas storage capacity of the energy storage power generation system 10, which is beneficial for realizing the application of the energy storage power generation system 10 with a larger gas storage capacity.

[0089] In some embodiments, such as Figure 1 and Figure 2As shown, the energy storage and power generation system 10 also includes a first pipe 610, a second pipe 620, a third pipe 630, a first valve 710, and a second valve 720. The first receiving cavities Q1 of multiple first containers 110 are connected in parallel to the first pipe 610. The first pipe 610 is connected to the air inlet of the compressor unit 300 via the second pipe 620, and the first pipe 610 is connected to the air outlet of the turbine unit 400 via the third pipe 630. The first valve 710 is located on the second pipe 620, and the second valve 720 is located on the third pipe 630.

[0090] When the energy storage power generation system 10 is performing energy storage operations, the first valve 710 can be opened and the second valve 720 can be closed. When the energy storage power generation system 10 is performing energy release operations, the second valve 720 can be opened and the first valve 710 can be closed. This allows for convenient separate energy storage and energy release operations.

[0091] In some embodiments, such as Figure 1 and Figure 2 As shown, the energy storage and power generation system 10 also includes a first pump 810 and a second pump 820. The first pump 810 is used to pump the working medium flowing to the second container 120, and the second pump 820 is used to pump the working medium out of the second container 120.

[0092] Thus, the first pump 810 can be used to transport the condensed working fluid flowing to the second container 120 to the second receiving chamber Q2 of the second container 120, thereby achieving the preservation of the low-temperature, high-pressure, and liquid working fluid. The second pump 820 can also be used to transport the liquid working fluid preserved in the second receiving chamber Q2 of the second container 120 to at least two heat exchangers 210 or at least one second heat exchanger 212, thereby facilitating the vaporization of the working fluid and the subsequent delivery of the vaporized working fluid to the turbine unit 400.

[0093] The energy storage and power generation system 10 also includes a fourth pipe 640, a fifth pipe 650, a third valve 730, and a fourth valve 740. Specifically, as... Figure 1 In the embodiment shown, the fourth pipe 640 is connected between the outlet of the first heat exchange channel H1 of the heat exchanger 210 and the second receiving cavity Q2, the fifth pipe 650 is connected between the second receiving cavity Q2 and the inlet of the second heat exchange channel H2 of the heat exchanger 210, the third valve 730 and the first pump 810 are provided on the fourth pipe 640, and the fourth valve 740 and the second pump 820 are provided on the fifth pipe 650.

[0094] Specifically, such as Figure 2In the embodiment shown, the fourth pipe 640 is connected between the outlet of the first heat exchange channel H1 of the first heat exchanger 211 and the second receiving cavity Q2, the fifth pipe 650 is connected between the second receiving cavity Q2 and the inlet of the third heat exchange channel H3 of the second heat exchanger 212, the third valve 730 and the first pump 810 are provided on the fourth pipe 640, and the fourth valve 740 and the second pump 820 are provided on the fifth pipe 650.

[0095] Thus, when the energy storage power generation system 10 is performing energy storage operations, the first valve 710 and the third valve 730 can be opened, while the second valve 720 and the fourth valve 740 can be closed. When the energy storage power generation system 10 is performing energy release operations, the second valve 720 and the fourth valve 740 can be opened, while the first valve 710 and the third valve 730 can be closed. This allows for convenient separate energy storage and energy release operations.

[0096] It should be noted that, specifically, as Figure 1 In the illustrated embodiment, before energy storage operations are performed and the second valve 720 and the fourth valve 740 are closed, the condensed working fluid in the second receiving cavity Q2 has been transported to the second heat exchange channel H2 of the multiple heat exchangers 210 (in preparation for energy storage operations). During energy storage operations, this portion of the second heat exchange channel H2 of the heat exchangers 210 can be heated and vaporized to prepare for energy release operations.

[0097] In some embodiments, the first container 110 is an underground mine, an underground salt cavern, or a flexible airbag.

[0098] A suitable-sized and well-sealed mine cavern or salt cavern can be selected underground as needed to store the gaseous working medium. Alternatively, a flexible airbag can be selected to store the gaseous working medium, thereby saving ground space and reducing costs. In addition, the flexibility of the flexible airbag can improve the pressure resistance and storage safety of the first container 110.

[0099] In some embodiments, the first container 110 is used to store a working fluid at normal temperature and pressure, thereby improving the storage safety of the first container 110.

[0100] In some embodiments, the energy storage power generation system 10 further includes a motor 900, and a generator 500 are respectively used for electrical connection to the power grid. The power grid is used to supply power to the motor 900, and the generator 500 is used to store electrical energy in the power grid. The motor 900 is connected to the compressor unit 300 to drive the compressor unit 300.

[0101] When wind and solar resources are abundant and power generation is high while power consumption is low, the power grid can be used to supply power to the motor 900, which in turn drives the compressor unit 300 to work, thereby realizing the energy storage operation of the energy storage power generation system 10. Alternatively, when wind and solar resources are scarce and power generation is low while power consumption is high, the energy storage power generation system 10 can release energy, allowing the generator 500 to store electrical energy in the grid. In this way, cyclical power consumption and power generation operations can be realized.

[0102] Specifically, such as Figure 1 In the embodiment shown, the energy storage power generation system 10 includes a plurality of second containers 120, the second accommodating cavities Q2 of the plurality of second containers 120 are arranged in parallel and are sequentially connected to the outlets of the first heat exchange channels H1 of at least two heat exchangers 210, and the second accommodating cavities Q2 of the plurality of second containers 120 are arranged in parallel and are sequentially connected to the inlets of the second heat exchange channels H2 of at least two heat exchangers 210.

[0103] For example, the number of second containers 120 is 2, 3 or 4.

[0104] Setting up multiple second containers 120 can increase the liquid storage capacity of the energy storage power generation system 10, which is beneficial for realizing the application of the energy storage power generation system 10 with a larger liquid storage capacity.

[0105] Specifically, such as Figure 1 In the illustrated embodiment, at least two heat exchangers 210 include two first heat exchangers 211 and one second heat exchanger 212. The first heat exchange channel H1 of one first heat exchanger 211, the first heat exchange channel H1 of the second heat exchanger 212, and the first heat exchange channel H1 of the other first heat exchanger 211 are connected in series. The second heat exchange channel H2 of one first heat exchanger 211, the second heat exchange channel H2 of the second heat exchanger 212, and the second heat exchange channel H2 of the other first heat exchanger 211 are also connected in series. The second heat exchanger 212 is a regenerative heat exchanger.

[0106] In this way, the second heat exchanger 212 can be used to store the heat of compression, thereby facilitating the heating and vaporization of the liquid working fluid in the second receiving cavity Q2 using the second heat exchanger 212.

[0107] Specifically, such as Figure 2In the illustrated embodiment, the energy storage power generation system 10 includes a plurality of second containers 120, the second receiving cavities Q2 of the plurality of second containers 120 are arranged in parallel and connected between a fourth pipe 640 and a fifth pipe 650. The end of the fourth pipe 640 away from the second containers 120 is connected to the outlet of the first heat exchange channel H1 of the first heat exchanger 211, and the end of the fifth pipe 650 away from the second containers 120 is connected to the inlet of the third heat exchange channel H3 of the second heat exchanger 212. A first pump 810 and a third valve 730 are provided on the fourth pipe 640, and a second pump 820 and a fourth valve 740 are provided on the fifth pipe 650.

[0108] Setting up multiple second containers 120 can increase the liquid storage capacity of the energy storage power generation system 10, which is beneficial for realizing the application of the energy storage power generation system 10 with a larger liquid storage capacity.

[0109] Specifically, such as Figure 1 In the illustrated embodiment, the turbine unit 400 may include a plurality of turbines 410 and a plurality of regenerators 420 corresponding one-to-one with the plurality of turbines 410 (e.g., Figure 3 As shown, each turbine 410 has an inlet, an outlet, and an outlet. The outlets of the second heat exchange channels H2 of at least two heat exchangers 210 are sequentially connected to the inlet of the upstream turbine 410 among all turbines 410. Among two adjacent turbines 410, the outlet of one turbine 410 is connected to the inlet of the other turbine 410. The outlet of the downstream turbine 410 among all turbines 410 is connected to the first receiving cavity Q1. The regenerator 420 has a fifth heat exchange channel H5 and a sixth heat exchange channel H6 that exchanges heat with the fifth heat exchange channel H5. The outlet of the turbine 410 is connected to the inlet of the corresponding fifth heat exchange channel H5 of the regenerator 420. The outlets of the fifth heat exchange channels H5 of all regenerators 420 are connected to the first receiving cavity Q1. The sixth heat exchange channel H6 of the regenerator 420 is connected in series and is connected between the outlet of the second heat exchange channel H2 of at least two heat exchangers 210 and the air inlet of the upstream turbine 410 among all turbines 410.

[0110] In this way, a portion of the high-temperature and gaseous working fluid can be extracted from the exhaust port of the turbine 410, and the working fluid flowing from the second heat exchange channel H2 of the heat exchanger 210 to the exhaust port of the turbine 410 at the upstream end can be heated by multiple regenerators 420, thereby achieving staged heating and thus improving power generation efficiency.

[0111] Specifically, such as Figure 2 In the illustrated embodiment, the turbine unit 400 may include a plurality of turbines 410 and a plurality of regenerators 420 corresponding one-to-one with the plurality of turbines 410 (e.g., Figure 3As shown, each turbine 410 has an inlet, an outlet, and an outlet. The outlet of the third heat exchange channel H3 of at least one second heat exchanger 212 is connected to the inlet of the upstream turbine 410 among all turbines 410. Among two adjacent turbines 410, the outlet of one turbine 410 is connected to the inlet of the other turbine 410. The outlet of the downstream turbine 410 among all turbines 410 is connected to the first receiving cavity Q1. The regenerator 420 has a fifth heat exchange channel H5 and a sixth heat exchange channel H6 that exchanges heat with the fifth heat exchange channel H5. The outlet of the turbine 410 is connected to the inlet of the corresponding fifth heat exchange channel H5 of the regenerator 420. The outlet of the fifth heat exchange channel H5 of all regenerators 420 is connected to the first receiving cavity Q1. The sixth heat exchange channel H6 of the regenerator 420 is connected in series and is connected between the outlet of the third heat exchange channel H3 of at least one second heat exchanger 212 and the air inlet of the upstream turbine 410 among all turbines 410.

[0112] Similarly, a portion of the high-temperature, gaseous working fluid can be extracted from the exhaust port of the turbine 410, and multiple regenerators 420 can be used to heat the working fluid flowing from the third heat exchange channel H3 of the second heat exchanger 212 to the exhaust port of the turbine 410 at the upstream end, thereby achieving staged heating and thus improving power generation efficiency.

[0113] It should be noted that all turbines 410 of the turbine unit 400 are connected to the generator 500, and each turbine 410 is used to drive the generator 500 to generate electricity.

[0114] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0115] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. An energy storage power generation system, characterized in that, include: The first container has a first receiving cavity for storing the gaseous working fluid; The second container has a second receiving cavity for storing the liquid working fluid; At least two heat exchangers, each heat exchanger having a first heat exchange channel and a second heat exchange channel for exchanging heat with the first heat exchange channel; A compressor unit has an air inlet and an air outlet; a first receiving cavity is connected to the air inlet of the compressor unit, the air outlet of the compressor unit is sequentially connected to the inlet of the first heat exchange channel of at least two heat exchangers, and the outlet of the first heat exchange channel of at least two heat exchangers is sequentially connected to the second receiving cavity; the at least two heat exchangers are used to condense the working fluid flowing to the second container into a liquid working fluid; A turbine unit has an inlet and an outlet; a second receiving cavity is sequentially connected to the inlets of the second heat exchange channels of at least two of the heat exchangers; the outlets of the second heat exchange channels of at least two of the heat exchangers are sequentially connected to the inlet of the turbine unit; the outlet of the turbine unit is connected to the first receiving cavity; the at least two heat exchangers are further used to vaporize the working fluid flowing out of the second container into a gaseous working fluid; and A generator is connected to the turbine unit, which drives the generator to generate electricity. The first container is located underground, while the second container, at least two heat exchangers, the compressor unit, the turbine unit, and the generator are all located on the ground.

2. An energy storage power generation system, characterized in that, include: The first container has a first receiving cavity for storing the gaseous working fluid; The second container has a second receiving cavity for storing the liquid working fluid; At least two heat exchangers, the at least two heat exchangers including at least one first heat exchanger and at least one second heat exchanger; the first heat exchanger has a first heat exchange channel and a second heat exchange channel for exchanging heat with the first heat exchange channel; the second heat exchanger has a third heat exchange channel and a fourth heat exchange channel for exchanging heat with the third heat exchange channel. A compressor unit has an air inlet and an air outlet; a first receiving cavity is connected to the air inlet of the compressor unit, the air outlet of the compressor unit is connected to the inlet of the first heat exchange channel of the first heat exchanger, and the outlet of the first heat exchange channel of the first heat exchanger is connected to the second receiving cavity; the at least one first heat exchanger is used to condense the working fluid flowing to the second container into a liquid working fluid. A heat storage container; the heat storage container is connected to the second heat exchange channel of all the first heat exchangers and the fourth heat exchange channel of all the second heat exchangers respectively, so as to receive the working fluid flowing out of the second heat exchange channel of all the first heat exchangers, and to supply the working fluid to the fourth heat exchange channel of all the second heat exchangers. A turbine unit has an inlet and an outlet; a second receiving cavity is connected to the inlet of the third heat exchange channel of all the second heat exchangers, and the outlet of the third heat exchange channel of all the second heat exchangers is connected to the inlet of the turbine unit; the outlet of the turbine unit is connected to the first receiving cavity; the at least one second heat exchanger is used to vaporize the working fluid flowing out of the second container into a gaseous working fluid; and A generator is connected to the turbine unit, which drives the generator to generate electricity. The first container is located underground, while the second container, at least two heat exchangers, the heat storage container, the compressor unit, the turbine unit, and the generator are all located on the ground.

3. The energy storage power generation system according to claim 2, characterized in that, The outlet of the fourth heat exchange channel of the second heat exchanger is connected to the inlet of the second heat exchange channel of the first heat exchanger.

4. The energy storage power generation system according to any one of claims 1-3, characterized in that, The energy storage power generation system includes multiple first containers; The first receiving cavities of multiple first containers are connected in parallel to the air inlet of the compressor unit; The first receiving cavities of multiple first containers are connected in parallel to the air outlet of the turbine unit.

5. The energy storage and power generation system according to claim 4, characterized in that, The energy storage power generation system also includes a first pipeline, a second pipeline, a third pipeline, a first valve, and a second valve; The first receiving cavities of multiple first containers are connected in parallel to the first pipe; The first pipe is connected to the air inlet of the compressor unit via the second pipe; The first pipe is connected to the air outlet of the turbine unit through the third pipe; The first valve is installed on the second pipeline; The second valve is located on the third pipeline.

6. The energy storage and power generation system according to claim 5, characterized in that, The energy storage power generation system also includes: The first pump is used to pump the working fluid flowing to the second container; The second pump is used to pump the working fluid out of the second container.

7. The energy storage power generation system according to any one of claims 1-3, characterized in that, The first container is an underground mine shaft, an underground salt cavern, or a flexible airbag; and / or The first container is used to store the working fluid at normal temperature and pressure.

8. The energy storage power generation system according to any one of claims 1-3, characterized in that, The energy storage power generation system also includes an electric motor and a power supply unit; The power supply is electrically connected to the motor to supply power to the motor; The generator is electrically connected to the power supply to store electrical energy in the power supply. The electric motor is connected to the compressor unit to drive the compressor unit.

9. The energy storage and power generation system according to claim 1, characterized in that, The energy storage power generation system includes multiple second containers; The second receiving cavities of a plurality of second containers are arranged in parallel and are sequentially connected to the outlets of the first heat exchange channels of at least two of the heat exchangers; The second containment cavities of a plurality of second containers are arranged in parallel and are sequentially connected to the inlet of the second heat exchange channel of at least two of the heat exchangers.

10. The energy storage and power generation system according to claim 1, characterized in that, The at least two heat exchangers include two first heat exchangers and one second heat exchanger; The first heat exchange channel of one of the first heat exchangers, the first heat exchange channel of the second heat exchanger, and the first heat exchange channel of the other first heat exchanger are connected in series. The second heat exchange channel of one of the first heat exchangers, the second heat exchange channel of the second heat exchanger, and the second heat exchange channel of the other first heat exchanger are connected in series.

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