Compressed air energy storage system comprising combined storage tank and control method of compressed air energy storage system

Abstract

The invention relates to the technical field of novel energy, in particular to a compressed air energy storage system comprising a combined storage tank and a control method thereof.The compressed air energy storage system comprises a compressor used for compressing air and a heat exchanger used for conveying a heat exchange medium and conducting heat exchange with the compressed air; the heat storage tank is used for storing heat generated in the heat exchange process of the heat exchange medium and the compressed air; the turbine is used for carrying out gas expansion on the compressed air subjected to heat exchange and releasing heat energy; and the combined storage tank is used for storing the cooled compressed air subjected to heat exchange with the heat exchange medium and the cooled heat exchange medium subjected to heat exchange with the compressed air. Compressed air and space can be fully utilized through the combined storage tank, meanwhile, the compression efficiency and stability of the compressor and the power capability of the compressed air of the system in the turbine expansion stage can be improved through the arrangement method of the vertical positions of the heat storage tank and the combined storage tank, and therefore the higher operation efficiency of the compressed air energy storage system is achieved.

Description

Technical Field

[0001] The present application relates to the field of new energy technologies, and in particular to a compressed air energy storage system including a combined storage tank and a control method thereof. Background Art

[0002] Since the "dual carbon" goal was proposed, my country's pace of green and low-carbon energy transformation has continued to accelerate, and renewable energy has developed rapidly. Compressed air energy storage, as a large-scale energy storage technology, uses electricity to compress and store air during low-load periods, and then releases the stored air to generate electricity during high-load periods, promoting the construction of new power systems and making important contributions to energy conservation and emission reduction.

[0003] Among the related technologies, compressed air energy storage technology, as an effective energy storage solution, has received extensive research attention. Unlike traditional compressed air energy storage technology abroad, the compressed air energy storage technology studied in China does not require natural gas re-combustion, stores and utilizes the heat generated during the compression process, heats the air during the expansion stage, and achieves efficient use of energy. However, compared with traditional compressed air energy storage technology, onshore compressed air energy storage technology still mostly uses a fixed volume storage method.

[0004] However, the traditional compressed air energy storage system in the relevant technology mostly uses fixed-volume storage as the gas storage method, and the storage volume remains fixed. During the air compression process, as the compressed air continues to flow in, the compressed air energy storage system will have low efficiency in the initial gas storage stage and increase energy consumption. The energy utilization rate is low, and it is difficult to meet the energy storage requirements of the power system, which needs to be solved urgently. Summary of the invention

[0005] The present application provides a compressed air energy storage system including a combined storage tank and a control method thereof, in order to solve the problems that the gas storage method of the compressed air energy storage system in the related art is mostly fixed-volume storage, the storage volume is fixed, and during the air compression process, as the compressed air continues to flow in, the compressed air energy storage system will have low efficiency in the initial gas storage stage and increase energy consumption, resulting in low energy utilization rate and difficulty in meeting the energy storage requirements of the power system.

[0006] The first aspect of the present application provides a compressed air energy storage system containing a combined storage tank, including: a compressor for compressing air, a heat exchanger for conveying a heat exchange medium for heat exchange with the compressed air; a heat storage tank for storing heat generated during the heat exchange process between the heat exchange medium and the compressed air; a turbine for expanding the compressed air after the heat exchange to release heat energy; and a combined storage tank for storing the cooled compressed air after heat exchange with the heat exchange medium and the cooled heat exchange medium after heat exchange with the compressed air.

[0007] Optionally, in one embodiment of the present application, the combined storage tank further includes: at least one working medium inlet and outlet for introducing or discharging the heat exchange medium; at least one compressed air inlet and outlet for introducing or discharging the compressed air; a cold storage space provided in the combined storage tank for storing the cooled heat exchange medium after heat exchange with the compressed air; a driving member for discharging the compressed air and the heat exchange medium; and an air storage space provided in the combined storage tank for storing the cooled compressed air after heat exchange with the heat exchange medium.

[0008] Optionally, in one embodiment of the present application, the driving member is a piston to perform an up and down movement action to discharge the compressed air and the heat exchange medium.

[0009] Optionally, in one embodiment of the present application, the heat storage tank is arranged above the combined storage tank.

[0010] A second aspect of the present application provides a control method for a compressed air energy storage system including a combined storage tank, using the compressed air energy storage system including the combined storage tank, wherein the method comprises the following steps: using the compressor to compress the air to obtain compressed air that is initially pressurized and heated; subjecting the compressed air that is initially pressurized and heated to heat exchange with a heat exchange medium in the heat exchanger to obtain compressed air that is cooled and pressurized; subjecting the compressed air that is cooled and pressurized to heat exchange with the heat exchange medium again in the heat exchanger to obtain compressed air that is heated and pressurized for a second time; and expanding the compressed air that is heated and pressurized for a second time to release the heat energy of the compressed air that is heated and pressurized for a second time.

[0011] The third aspect of the present application provides an electronic device, comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement a control method for a compressed air energy storage system comprising a combined storage tank as described in the above embodiment.

[0012] A fourth aspect of the present application provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, which, when executed by a processor, implements the control method for a compressed air energy storage system containing a combined storage tank as described above.

[0013] The fifth aspect of the present application provides a computer program product, including a computer program, which, when executed, is used to implement the control method of the compressed air energy storage system containing the combined storage tank as described above.

[0014] The embodiment of the present application can combine the cold storage tank and the gas storage device in the compressed air energy storage system to form a combined storage tank, and set the positions of the heat storage tank and the combined storage tank so that the heat storage tank is higher and the combined storage tank is lower. In this way, the full utilization of compressed air and space is achieved through the combined storage tank. At the same time, the arrangement method of the upper and lower positions of the heat storage tank and the combined storage tank can improve the compression efficiency and stability of the compressor and the system's ability to do work in the compressed air during the turbine expansion stage, thereby achieving a higher operating efficiency of the compressed air energy storage system, and to a great extent meeting the higher requirements of the power system for energy storage. In this way, the problem that the traditional compressed air energy storage system structure in the related art is mostly fixed volume storage, and the storage volume is fixed and unchanged. During the air compression process, as the compressed air continues to flow in, the compressed air energy storage system will have a low efficiency in the initial air storage stage and will also increase energy consumption, resulting in a low energy utilization rate, and it is difficult to meet the requirements of the power system for energy storage.

[0015] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The above additional aspects and / or advantages of the present application will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0017] Figure 1 A schematic structural diagram of a compressed air energy storage system including a combined storage tank provided according to an embodiment of the present application;

[0018] Figure 2 This is a schematic structural diagram of a traditional non-supplementary combustion compressed air energy storage system according to an embodiment of the present application;

[0019] Figure 3 A schematic diagram of a combined storage tank for a compressed air energy storage system according to an embodiment of the present application;

[0020] Figure 4 This is a schematic diagram of the location layout of a compressed air energy storage and heat storage tank and a combined storage tank system according to an embodiment of the present application;

[0021] Figure 5 A flow chart of a control method for a compressed air energy storage system including a combined storage tank according to an embodiment of the present application;

[0022] Figure 6 It is a schematic diagram of the structure of an electronic device provided according to an embodiment of the present application.

[0023] Reference numerals:

[0024] 10- Compressed air energy storage system with combined storage tank: 100- compressor, 200- heat exchanger, 300- heat storage tank, 400- turbine and 500- combined storage tank; 601- memory, 602- processor and 603- communication interface. DETAILED DESCRIPTION

[0025] Embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0026] The following describes a compressed air energy storage system and its control method containing a combined storage tank in an embodiment of the present application with reference to the accompanying drawings. In view of the fact that the gas storage method of the traditional compressed air energy storage system in the related art mentioned in the above background technology is mostly fixed volume storage, and the storage volume is fixed. During the compressed air process, as the compressed air continues to flow in, the compressed air energy storage system will have low efficiency in the initial gas storage stage and increase energy consumption. The energy utilization rate is low, and it is difficult to meet the requirements of the power system for energy storage. The present application provides a compressed air energy storage system containing a combined storage tank, which can combine the cold storage tank and the gas storage device in the traditional non-supplementary compressed air energy storage system to form a combined storage tank, and set the positions of the heat storage tank and the combined storage tank so that the heat storage tank is higher and the combined storage tank is lower. In this way, the full utilization of compressed air and space is achieved through the combined storage tank. At the same time, the arrangement method of the upper and lower positions of the heat storage tank and the combined storage tank can improve the compression efficiency of the compressor and the stability of the gas storage and release stages, thereby achieving a higher operating efficiency of the compressed air energy storage system, and greatly meeting the higher requirements of the power system for energy storage. This solves the problem that the traditional compressed air energy storage system in the relevant technology mostly uses fixed-volume storage as the gas storage method, and the storage volume remains fixed. During the air compression process, as the compressed air continues to flow in, the compressed air energy storage system will have low efficiency in the initial gas storage stage and increase energy consumption, resulting in low energy utilization rate and difficulty in meeting the energy storage requirements of the power system.

[0027] Specifically, Figure 1 A schematic structural diagram of a compressed air energy storage system including a combined storage tank provided in an embodiment of the present application.

[0028] like Figure 1 As shown, the compressed air energy storage system 10 including the combined storage tank includes: a compressor 100 , a heat exchanger 200 , a heat storage tank 300 , a turbine 400 and a combined storage tank 500 .

[0029] The compressor 100 is used to compress air.

[0030] In some embodiments, in the compressed air energy storage system 10 with a combined storage tank of the present application, the compressor 100 is one of the important components of the compressed air energy storage system 10 with a combined storage tank. There are many types of compressors 100, such as piston compressors, screw compressors, centrifugal compressors, and the like.

[0031] When the compressed air energy storage system 10 with a combined storage tank in the embodiment of the present application is working, electric energy can be used to drive the motor and the compressor 100 to operate, so that the air is gradually compressed. After the compressor 100 compresses the normal pressure air to a high pressure state, a large amount of energy can be stored. When the air is compressed, the distance between its molecules decreases and the internal energy increases. This part of the energy can be released through expansion when needed.

[0032] Furthermore, the embodiment of the present application can adjust the compression ratio and compression amount as needed through the compressor 100 to adapt to different energy storage cycles and energy requirements, store a large amount of energy in a relatively small space, improve energy storage efficiency and achieve long-term energy storage.

[0033] For example, in the process of compressing air using the compressor 100, the pressure and temperature of the air will increase accordingly. For example, in the operation of some compressed air energy storage systems 10 with combined storage tanks, the compressor 100 may compress the air to a pressure of 70 to 100 bar, and the temperature of the air will also increase significantly, possibly reaching 1000°C.

[0034] In the embodiment of the present application, a compressor 100 can be provided in a compressed air energy storage system including a combined storage tank. Through the operation of the compressor 100, a large amount of air energy can be stored in high-pressure air and released through expansion when needed, thereby providing stable and reliable energy support.

[0035] The heat exchanger 200 is used to transport a heat exchange medium to perform heat exchange with the compressed air.

[0036] In certain embodiments, the compressed air energy storage system 10 containing a combined storage tank in the present application may be provided with a heat exchanger 200, and the heat exchanger 200 may transport a working medium such as a heat exchange medium to exchange heat with the high-temperature and high-pressure air compressed by the compressor 100, thereby cooling the compressed high-temperature and high-pressure air, thereby reducing the temperature of the compressed air for easy storage.

[0037] Moreover, in the compressed air energy storage system 10 including the combined storage tank, the heat exchanger 200 can recover the heat generated by the compressor 100 and transfer it to the compressed air, so that the temperature of the compressed air increases. In this way, when the compressed air is released for power generation, more energy output can be obtained, thereby improving the energy storage and power generation efficiency of the system.

[0038] Also, when releasing compressed air, if the temperature is too high, it may cause damage to the system or create danger. By using the heat exchanger 200, the temperature can be reduced to a safe range, thereby enhancing the safety and stability of the compressed air energy storage system 10 containing a combined storage tank. Moreover, when the compressed air energy storage system 10 containing a combined storage tank releases compressed air and converts it into electrical energy, the temperature will drop. This temperature difference can be used as direct energy, but most of it will be lost. By providing a heat exchanger 200, the heat between the compressed air and the surrounding environment can be exchanged, so that the temperature difference is reduced, thereby reducing energy loss.

[0039] The embodiment of the present application may be provided with a heat exchanger 200. By properly designing and using the heat exchanger 200, the compressed air energy storage system 10 including the combined storage tank may be operated more efficiently, stably and reliably.

[0040] The heat storage tank 300 is used to store the heat generated during the heat exchange process between the heat exchange medium and the compressed air.

[0041] Based on the relevant descriptions of other embodiments, it can be understood that in the process of air compression by the compressor 100, the air is compressed to a high temperature and high pressure state, which will generate a large amount of heat. If this heat is not processed, it will be lost to the environment and wasted, which becomes a waste of energy. Therefore, the present application can set a heat storage tank 300 in the compressed energy storage system 10 to store the heat generated by the heat exchange medium and the compressed air during the heat exchange process.

[0042] For example, the heat storage tank 300 can store the heat generated by the compressor 100 during the air compression process. Through the heat recovery and reuse of the heat storage tank 300, the compressed air energy storage system 10 containing the combined storage tank can quickly release the large amount of heat energy stored in the heat storage tank 300 when needed to preheat the air entering the expander or perform other heat energy utilization, thereby improving the energy conversion efficiency of the entire system and reducing the operating cost of the compressed air energy storage system 10 containing the combined storage tank to a certain extent.

[0043] Furthermore, the heat storage tank 300 can also enable the compressed air energy storage system 10 containing a combined storage tank in the embodiment of the present application to operate more stably under different working conditions. For example, during periods of low electricity demand, the compressed air energy storage system 10 containing a combined storage tank can store more thermal energy; and during periods of peak electricity demand or high electricity prices, the compressed air energy storage system 10 containing a combined storage tank can release the stored thermal energy to generate electricity, thereby meeting the dispatching needs of the power grid. In addition, the heat storage tank 300 can also serve as a buffer device for the system to balance the heat fluctuations inside the compressed air energy storage system 10 containing a combined storage tank, thereby improving the flexibility and response speed of the compressed air energy storage system 10 containing a combined storage tank.

[0044] The embodiment of the present application can make the compressed air energy storage system 10 including the combined storage tank more efficient in utilizing energy and reducing energy waste and environmental pollution by reasonably designing and using the heat storage tank 300.

[0045] The turbine 400 is used to expand the compressed air after heat exchange to release heat energy.

[0046] As a possible implementation method, in the compressed air energy storage system 10 with a combined storage tank in the embodiment of the present application, after the compressor 100 compresses the air, a turbine 400 may be provided to cooperate with the compressor 100. The turbine 400 in the embodiment of the present application may be, but is not limited to, understood as an expander that converts compressed air into mechanical energy.

[0047] For example, in the energy storage stage, after the compressor 100 compresses the air, the compressed air energy storage system 10 containing the combined storage tank is cooled and stored. When energy release is required, the low-temperature and high-pressure air passes through the heat exchanger 200 and exchanges heat with the heat exchange medium transported by the heat storage tank 300 to achieve heat energy release. After the heat exchange, the heat exchange medium with a reduced temperature is transported back to other components in the compressed air energy storage system 10 containing the combined storage tank, and the compressed air regains part of the heat energy and the temperature rises. Next, the high-temperature and high-pressure air enters the expander, releases energy through the gas expansion process, and drives the generator to generate electricity. This can effectively improve the energy conversion efficiency and output efficiency of the compressed air energy storage system 10 containing the combined storage tank in the embodiment of the present application.

[0048] Additionally, the turbine 400 in the embodiment of the present application can also be flexibly adjusted according to the needs of the power grid and the state of the compressed air energy storage system 10 with the combined storage tank. For example, when a large amount of electrical energy is needed, the turbine 400 can quickly respond and release the stored energy to drive the generator to generate electricity to meet the electrical energy demand.

[0049] The embodiment of the present application may provide a turbine 400 in the compressed air energy storage system 10 including the combined storage tank. By properly designing and using the turbine 400, efficient conversion and storage of energy may be achieved, thereby making the compressed air energy storage system 10 including the combined storage tank in the embodiment of the present application operate more efficiently, stably and reliably.

[0050] The combined storage tank 500 is used to store the cooled compressed air after heat exchange with the heat exchange medium and the cooled heat exchange medium after heat exchange with the compressed air.

[0051] Those skilled in the art can understand that conventional onshore compressed air storage containers are generally fixed-volume storage containers. When there is a large gap between the pressure in the air tank and the preset storage pressure, in order to adapt to the large pressure difference, the compressor unit needs to consume electricity and time to establish the bottom air pressure in the early stage, which increases the operating cost. At the same time, during the turbine expansion stage, as the pressure in the tank continues to drop, the ability of air to drive the turbine to do work also gradually decreases, resulting in a large amount of air remaining in the tank that cannot be used.

[0052] As a possible implementation method, the embodiment of the present application can reduce the energy loss in the above situation with the structure of the combined storage tank, improve the energy utilization efficiency, and relatively reduce the space occupation. The combined storage tank 500 in the embodiment of the present application can combine the cold storage tank and the gas storage tank of the traditional compressed air energy storage system containing the combined storage tank into one tank, so as to fully utilize the space in the combined storage tank 500.

[0053] Next, the combined storage tank in the embodiment of the present application is further described.

[0054] Optionally, in one embodiment of the present application, the combined storage tank 500 further includes: at least one working medium inlet and outlet for introducing or discharging heat exchange medium; at least one compressed air inlet and outlet for introducing or discharging compressed air; a cold storage space provided in the cold storage tank for storing the cooled heat exchange medium after the compressed air is heat exchanged; a driving member for discharging compressed air and heat exchange medium; and an air storage space provided in the heat storage tank 300 for storing the cooled compressed air after heat exchange with the heat exchange medium. The driving member is a piston to perform the up and down movement action of discharging the compressed air and the heat exchange medium.

[0055] In the actual implementation process, the main structure of the combined storage tank in the present application includes but is not limited to: at least one heat exchange medium inlet and outlet, at least one compressed air inlet and outlet, a cold storage space arranged in the cold storage tank, a driving member and a gas storage space arranged in the heat storage tank.

[0056] Among them, at least one working medium inlet and outlet is used to introduce or discharge heat exchange medium; at least one compressed air inlet and outlet is used to introduce or discharge compressed air; the cold storage space is used to store the cooled heat exchange medium after heat exchange with compressed air; the driving member is used to discharge compressed air and heat exchange medium, which can be but is not limited to being set as a piston to discharge compressed air and heat exchange medium by performing up and down movement of the piston; the air storage space is used to store the cooled compressed air after heat exchange with the heat exchange medium.

[0057] For example, Figure 2 This is a schematic structural diagram of a conventional non-supplementary combustion compressed air energy storage system according to an embodiment of the present application. Figure 3 This is a schematic diagram of a compressed air energy storage combined storage tank according to an embodiment of the present application. Figure 2 As shown, the conventional compressed air energy storage system includes a compressor 1, a heat exchanger 2, a heat storage tank 3, an air storage tank 4, a turbine 5 and a cold storage tank 6. Figure 3 As shown, in the embodiment of the present application, the gas storage tank 4 and the cold storage tank 6 are combined into a combined storage tank, which can be divided into two upper and lower spaces, the upper end is the cold storage space, the lower end is the gas storage space, and the middle is a movable piston device.

[0058] like Figure 3 As shown, in the initial stage, the piston is at the lower end of the combined storage tank 500. In the compression and heat storage stage, the compressed air enters the air storage space 4-5. Due to the resistance between the upper piston and the tank wall and the gravity of the heat exchange medium, the energy consumption of establishing the bottom air pressure in the early stage of the compressor can be greatly reduced, thereby improving energy utilization efficiency.

[0059] When the pressure in the gas storage space reaches a certain value, the piston is pushed upward, and the heat exchange medium is discharged through the working medium inlet and outlet 4-1 for heat exchange. In the expansion and energy release stage, the compressed air inlet and outlet 4-2 are opened, and the compressed air and the heat exchange medium transported from the heat storage tank are heat exchanged and expanded, and the cooled heat exchange medium is transported back to the cold storage space of the combined storage tank 500. The gas storage space gradually becomes smaller due to the gravity of the heat exchange medium at the upper end pushing the piston downward, so that the compressed air is continuously discharged until the end, so that the compressed air is fully utilized, effectively improving the efficiency of the compressed air energy storage system 10 containing the combined storage tank.

[0060] Optionally, in one embodiment of the present application, the heat storage tank is arranged above the combined storage tank.

[0061] In other embodiments, considering that the piston in the combined storage tank 500 can move up and down, the changes in the gas storage space and the cold storage space will affect the gravitational potential energy of the combined storage tank 500, and thus have a certain impact on the overall compressed air energy storage system 10 containing the combined storage tank. In order to ensure the stable operation of the compressed air energy storage system 10 containing the combined storage tank, the embodiment of the present application can set the heat storage tank 300 above the combined storage tank 500.

[0062] Figure 4 This is a schematic diagram of the location layout of the compressed air energy storage tank and combined storage tank system in one embodiment of the present application. Figure 4As shown, H is the vertical height between the heat storage tank and the combined storage tank. During the compression stage, compressed air continuously enters the gas storage space to push the piston upward, forcing the heat exchange medium with a lower temperature to be discharged for heat absorption. At this time, the compressor back pressure gradually decreases due to the continuous reduction of the medium above the piston, which will cause a part of the energy loss. In the embodiment of the present application, the heat storage tank can be arranged above the combined storage tank, so that the pressure above the piston can remain almost unchanged, ensuring the stable working state of the compressor, so that the system efficiency is improved, and at the same time, the medium in the heat tank can be used to provide the conditions for converting the gravitational potential energy into kinetic energy for the combined storage tank below.

[0063] According to the compressed air energy storage system with a combined storage tank proposed in the embodiment of the present application, the cold storage tank and the gas storage device in the traditional non-supplementary compressed air energy storage system can be combined to form a combined storage tank, and the positions of the heat storage tank and the combined storage tank are set so that the heat storage tank is higher and the combined storage tank is lower. In this way, the full utilization of compressed air and space is achieved through the combined storage tank. At the same time, the arrangement method of the upper and lower positions of the heat storage tank and the combined storage tank can improve the compression efficiency of the compressor and the stability of the gas storage and release stages, thereby achieving a higher operating efficiency of the compressed air energy storage system, and to a great extent meeting the higher requirements of the power system for energy storage. In this way, the problem that the gas storage method of the traditional compressed air energy storage system in the related art is mostly fixed volume storage, and the storage volume is fixed and unchanged, and the compressed air continues to flow in during the air compression process, will cause the compressed air energy storage system to have low efficiency in the initial gas storage stage and increase energy consumption, and the energy utilization rate is low, and it is difficult to meet the requirements of the power system for energy storage.

[0064] Next, a flow chart of a control method for a compressed air energy storage system including a combined storage tank proposed in accordance with an embodiment of the present application is described with reference to the accompanying drawings.

[0065] Figure 5 It is a flow chart of a control method of a compressed air energy storage system including a combined storage tank according to an embodiment of the present application.

[0066] like Figure 5 As shown, the flow chart of the control method of the compressed air energy storage system including the combined storage tank includes the following steps:

[0067] Step S501, compressing air using a compressor to obtain compressed air after initial pressurization and temperature increase;

[0068] Step S502, exchanging heat between the compressed air after initial pressurization and temperature increase and the heat exchange medium in a heat exchanger to obtain compressed air after temperature reduction and pressure increase;

[0069] Step S503, exchanging heat again between the compressed air that has been cooled and pressurized and the heat exchange medium in a heat exchanger to obtain compressed air that has been heated and pressurized for a second time;

[0070] Step S504, expanding the compressed air that has been heated and pressurized twice to release the heat energy of the compressed air that has been heated and pressurized twice.

[0071] It should be noted that the aforementioned explanation of the embodiment of the compressed air energy storage system containing a combined storage tank is also applicable to the control method of the compressed air energy storage system containing a combined storage tank in this embodiment, and will not be repeated here.

[0072] According to the control method of the compressed air energy storage system containing a combined storage tank proposed in the embodiment of the present application, the cold storage tank and the gas storage device in the traditional non-supplementary compressed air energy storage system can be combined to form a combined storage tank, and the positions of the heat storage tank and the combined storage tank are set so that the heat storage tank is higher and the combined storage tank is lower. In this way, the full utilization of compressed air and space is achieved through the combined storage tank. At the same time, the arrangement method of the upper and lower positions of the heat storage tank and the combined storage tank can improve the compression efficiency of the compressor and the stability of the gas storage and release stages, thereby achieving a higher operating efficiency of the compressed air energy storage system, and to a great extent meeting the higher requirements of the power system for energy storage. In this way, the problem that the gas storage method of the traditional compressed air energy storage system in the related art is mostly fixed volume storage, and the storage volume is fixed and unchanged, and the compressed air continues to flow in during the air compression process, will cause the compressed air energy storage system to have low efficiency in the initial gas storage stage and increase energy consumption, and the energy utilization rate is low, and it is difficult to meet the requirements of the power system for energy storage.

[0073] Figure 6 A schematic diagram of the structure of an electronic device provided in an embodiment of the present application. The electronic device may include:

[0074] A memory 601 , a processor 602 , and a computer program stored in the memory 601 and executable on the processor 602 .

[0075] When the processor 602 executes the program, the control method of the compressed air energy storage system including the combined storage tank provided in the above embodiment is implemented.

[0076] Furthermore, the electronic device further comprises:

[0077] The communication interface 603 is used for communication between the memory 601 and the processor 602 .

[0078] The memory 601 is used to store computer programs that can be executed on the processor 602 .

[0079] The memory 601 may include a high-speed RAM memory, and may also include a non-volatile memory (non-volatile memory), such as at least one disk memory.

[0080] If the memory 601, the processor 602 and the communication interface 603 are implemented independently, the communication interface 603, the memory 601 and the processor 602 can be connected to each other through a bus and communicate with each other. The bus can be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus or an Extended Industry Standard Architecture (EISA) bus. The bus can be divided into an address bus, a data bus, a control bus, etc. For ease of representation, Figure 6 Only one thick line is used in the diagram, but this does not mean that there is only one bus or only one type of bus.

[0081] Optionally, in a specific implementation, if the memory 601, the processor 602 and the communication interface 603 are integrated on a chip, the memory 601, the processor 602 and the communication interface 603 can communicate with each other through an internal interface.

[0082] The processor 602 may be a central processing unit (CPU), or an application specific integrated circuit (ASIC), or one or more integrated circuits configured to implement the embodiments of the present application.

[0083] An embodiment of the present application also provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the control method of the compressed air energy storage system containing a combined storage tank as described above.

[0084] An embodiment of the present application also provides a computer program product, including a computer program, which can run computer instructions. When the computer instructions are executed by a processor, the control method of the compressed air energy storage system containing the combined storage tank provided in the embodiment of the present application is implemented.

[0085] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or N embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0086] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, "N" means at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0087] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, fragment or portion of code comprising one or N executable instructions for implementing the steps of a custom logical function or process, and the scope of the preferred embodiments of the present application includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in reverse order depending on the functions involved, which should be understood by technicians in the technical field to which the embodiments of the present application belong.

[0088] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as an ordered list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by an instruction execution system, device or apparatus (such as a computer-based system, a system including a processor, or other system that can fetch instructions from an instruction execution system, device or apparatus and execute instructions), or in combination with these instruction execution systems, devices or apparatuses. For the purpose of this specification, "computer-readable medium" can be any device that can contain, store, communicate, propagate or transmit a program for use by an instruction execution system, device or apparatus, or in combination with these instruction execution systems, devices or apparatuses. More specific examples of computer-readable media (a non-exhaustive list) include the following: an electrical connection with one or N wirings (electronic devices), a portable computer disk box (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), a fiber optic device, and a portable compact disk read-only memory (CDROM). In addition, the computer-readable medium may even be paper or other suitable medium on which the program is printed, since the program may be obtained electronically by optically scanning the paper or other medium and then editing, interpreting or processing in other suitable ways as necessary and then storing it in a computer memory.

[0089] It should be understood that the various parts of the present application can be implemented by hardware, software, firmware or a combination thereof. In the above embodiment, the N steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. If implemented by hardware, as in another embodiment, it can be implemented by any one or a combination of multiple of the following technologies known in the art: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0090] A person skilled in the art may understand that all or part of the steps in the method for implementing the above-mentioned embodiment may be completed by instructing related hardware through a program, and the program may be stored in a computer-readable storage medium, which, when executed, includes one or a combination of the steps of the method embodiment.

[0091] In addition, each functional unit in each embodiment of the present application may be integrated into a processing module, or each unit may exist physically separately, or two or more units may be integrated into one module. The above-mentioned integrated module may be implemented in the form of hardware or in the form of a software functional module. If the integrated module is implemented in the form of a software functional module and sold or used as an independent product, it may also be stored in a computer-readable storage medium.

[0092] The storage medium mentioned above may be a read-only memory, a magnetic disk or an optical disk, etc. Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limiting the present application. A person of ordinary skill in the art may change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A compressed air energy storage system comprising a combined storage tank, characterized in that: include: Compressors for compressed air, A heat exchanger, used for conveying a heat exchange medium to perform heat exchange with the compressed air; A heat storage tank, used to store heat generated during the heat exchange process between the heat exchange medium and the compressed air; A turbine is used to expand the compressed air after heat exchange to release heat energy; The combined storage tank is used to store the cooled compressed air after heat exchange with the heat exchange medium and the cooled heat exchange medium after heat exchange with the compressed air.

2. The compressed air energy storage system according to claim 1, characterized in that: The combined storage tank further comprises: At least one working medium inlet and outlet for introducing or discharging the heat exchange medium; At least one compressed air inlet and outlet for introducing or exhausting the compressed air; A cold storage space provided in the combined storage tank for storing the heat exchange medium cooled after the compressed air is heat exchanged; A driving member, used for discharging the compressed air and the heat exchange medium; The air storage space arranged in the combined storage tank is used to store the cooled compressed air after heat exchange with the heat exchange medium.

3. The compressed air energy storage system according to claim 2, characterized in that: The driving member is a piston to perform an up-and-down movement to discharge the compressed air and the heat exchange medium.

4. The compressed air energy storage system according to claim 1, characterized in that: The heat storage tank is arranged above the combined storage tank.

5. A control method for a compressed air energy storage system containing a combined storage tank, characterized in that: Using the compressed air energy storage system comprising a combined storage tank as described in any one of claims 1 to 4, wherein the method comprises the following steps: Compressing the air with the compressor to obtain compressed air after initial pressure increase and temperature increase; The compressed air after the initial pressurization and temperature increase is heat exchanged with the heat exchange medium in the heat exchanger to obtain compressed air with reduced temperature and increased pressure; The compressed air that has been cooled and pressurized is again subjected to heat exchange with the heat exchange medium in the heat exchanger to obtain compressed air that has been heated and pressurized for a second time; The compressed air that has been heated and pressurized twice is expanded to release heat energy of the compressed air that has been heated and pressurized twice.

6. An electronic device, characterized in that: include: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the control method for the compressed air energy storage system containing a combined storage tank as described in claim 5.

7. A computer-readable storage medium having a computer program stored thereon, characterized in that: The program is executed by a processor to implement the control method of the compressed air energy storage system containing a combined storage tank as described in claim 5.

8. A computer program product, comprising a computer program, characterized in that When the computer program is executed, it is used to implement the control method of the compressed air energy storage system containing the combined storage tank as described in claim 5.

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