Redundant heat consumption device and method for compressed air energy storage system

Abstract

The invention discloses a redundant heat consumption device and method for a compressed air energy storage system, which is characterized in that a bypass cooling system is additionally arranged, a heat exchange device is adopted to consume redundant heat in a heat storage medium, the phenomenon that a thermodynamic parameter deviates from a preset threshold value is improved, and the compressed air energy storage system is always operated in a design state; the unit operation stability is improved.

Description

Technical Field

[0001] This invention relates to a device and method for absorbing redundant heat in a compressed air energy storage system, belonging to the technical field of compressed air energy storage systems. Background Technology

[0002] Non-combustion compressed air energy storage (CAES) technology is a large-scale physical energy storage solution based on thermodynamic cycles. Its technical system includes three core modules: air compression, gas storage, and expansion power generation. Unlike traditional combustion-based CAES, which relies on natural gas combustion to raise the turbine inlet temperature (efficiency 42%-55%, with carbon emissions and fuel dependence issues), the new technology achieves zero-carbon operation through thermodynamic optimization. During periods of low electricity load, multi-stage compressors pressurize air to 5-15 MPa, and the heat of compression is recovered in stages using phase change materials or molten salt systems. The high-pressure air is stored in underground salt caverns or artificial storage tanks. When releasing energy, the air is preheated through a thermal storage system to drive the turbine for power generation, eliminating the need for combustion chamber reheating.

[0003] The engineering application of non-combustion compressed air energy storage technology still faces many challenges. Large-capacity compressed air energy storage units that are already in operation, undergoing trial runs, or under construction primarily use composite heat storage media with good heat transfer performance and stable physical properties, such as water, molten salt, and heat transfer oil, to construct cascaded heat storage arrays. During the energy storage phase, the heat storage medium absorbs the high-quality compression heat generated by the compressor unit through a heat exchange device. During the energy release phase, the compression heat is fed back to high-pressure air through a heat exchanger, and the air then enters the turbine to expand and generate electricity to support the power balance of the power grid. Unlike the continuous and uninterrupted operation of thermal power units, compressed air energy storage units exhibit time-decoupled operation between the compression and expansion sides. Therefore, the energy balance of the heat storage system is mostly designed and calculated based on the unit operating under stable load. During actual operation, the unit is subject to adverse factors such as the start-up and shutdown characteristics of the main equipment, the dynamic response requirements of frequent grid dispatch, and the discontinuity of the unit during commissioning. This can lead to thermal redundancy in the thermal storage subsystem, which in turn causes the thermodynamic parameters of the energy storage / release process to deviate from the preset threshold. Consequently, the compressed air energy storage system deviates from its design state, affecting the stability of the unit's operation. Summary of the Invention

[0004] This invention provides a device and method for redundancy heat dissipation in a compressed air energy storage system, which solves the problems disclosed in the background art.

[0005] According to one aspect of this application, a redundant heat dissipation device is provided for dissipating redundant heat in the heat storage subsystem of a compressed air energy storage system. If the thermal storage subsystem is the first subsystem, the redundant heat absorption device includes a first heat exchange device. The first path of the first heat exchange device is connected in parallel with the inlet pipe of the low-temperature thermal storage medium tank in the first subsystem, and the second path of the first heat exchange device is externally connected to a first medium supply device. During redundant heat absorption, all the low-temperature thermal storage medium flowing into the low-temperature thermal storage medium tank passes through the first heat exchange device. The first subsystem is a thermal storage subsystem using water as the thermal storage medium. The temperature of the first medium is lower than the temperature of the low-temperature thermal storage medium. If the thermal storage subsystem is the second subsystem, the redundant heat absorption device includes a second heat exchange device. The inlet and outlet of the second path of the second heat exchange device are respectively connected to the outlet of the high-temperature thermal storage medium tank and the inlet of the low-temperature thermal storage medium tank in the second subsystem. The first path of the second heat exchange device is externally connected to a second medium supply device. During redundant heat absorption, all the high-temperature thermal storage medium output from the high-temperature thermal storage medium tank flows into the low-temperature thermal storage medium tank through the second path of the second heat exchange device. The second subsystem is a thermal storage subsystem using molten salt or heat transfer oil as the thermal storage medium. The temperature of the second medium is lower than the temperature of the high-temperature thermal storage medium.

[0006] Furthermore, the inlet of the first heat exchanger is sequentially equipped with a first isolation device, a first regulating device, and a second isolation device; the outlet of the first heat exchanger is equipped with a third isolation device. A fourth isolation device is installed on the inlet pipe of the low-temperature heat storage medium tank between the first connection and the second connection; wherein, the first connection is the connection between the inlet of the first path of the first heat exchange device and the inlet pipe of the low-temperature heat storage medium tank, and the second connection is the connection between the outlet of the first path of the first heat exchange device and the inlet pipe of the low-temperature heat storage medium tank. The inlet and outlet of the second path of the first heat exchanger are respectively equipped with a fifth isolation device and a sixth isolation device.

[0007] Furthermore, the first medium supply device is a cooling subsystem in the compressed air energy storage system, and the inlet and outlet of the second path of the first heat exchange device are respectively connected to the outlet of the circulating pump of the cooling subsystem and the inlet of the cooling tower.

[0008] Furthermore, the first heat exchange device is a shell-and-tube heat exchanger.

[0009] Furthermore, the inlet of the second path of the second heat exchanger is equipped with a seventh isolation device; the outlet of the second path of the second heat exchanger is equipped with an eighth isolation device, a second regulating device and a ninth isolation device in sequence. In the outlet pipeline of the high-temperature heat storage medium tank, a tenth isolation device is installed downstream of the third connection; wherein, the third connection is the connection between the inlet of the second path of the second heat exchange device and the outlet pipeline of the high-temperature heat storage medium tank. The inlet and outlet of the first path of the second heat exchanger are respectively equipped with an eleventh isolation device and a twelfth isolation device.

[0010] Furthermore, if the compressed air energy storage system includes a first subsystem and a second subsystem; The second medium supply device is the first subsystem. The inlet of the first path of the second heat exchange device is connected to the outlet of the high-temperature heat storage medium tank in the first subsystem, and the outlet of the first path of the second heat exchange device is connected to the external heating network.

[0011] Furthermore, the second heat exchange device is a cooling steam generator.

[0012] According to another aspect of this application, a method for redundant heat dissipation is provided, which uses the aforementioned redundant heat dissipation device to dissipate redundant heat, the method comprising: If the thermal storage subsystem is the first subsystem, control all the low-temperature thermal storage medium flowing into the low-temperature thermal storage medium tank to pass through the first heat exchange device, control the flow rate of the low-temperature thermal storage medium in the first path of the first heat exchange device, and keep the temperature of the low-temperature thermal storage medium entering the low-temperature thermal storage medium tank at the first preset value. If the thermal storage subsystem is the second subsystem, the high-temperature thermal storage medium output from the high-temperature thermal storage medium tank is controlled to flow into the low-temperature thermal storage medium tank through the second path of the second heat exchange device. The flow rate of the high-temperature thermal storage medium in the second path of the second heat exchange device is controlled to maintain the temperature of the low-temperature thermal storage medium input into the low-temperature thermal storage medium tank at the second preset value.

[0013] The beneficial effects achieved by the present invention are as follows: By adding a bypass cooling system and using a heat exchange device to absorb the redundant heat in the heat storage medium, the present invention improves the phenomenon of thermodynamic parameters deviating from the preset threshold, ensures that the compressed air energy storage system always operates in the design state, and improves the operational stability of the unit. Attached Figure Description

[0014] Figure 1 A schematic diagram of the redundant heat dissipation device when the thermal storage subsystem is the first subsystem; Figure 2 A schematic diagram of the redundant heat dissipation device when the thermal storage subsystem is the second subsystem; Figure 3 This is a schematic diagram of a compressed air energy storage system. Detailed Implementation

[0015] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this application or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0016] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this application.

[0017] At the same time, it should be understood that, for ease of description, the dimensions of the various parts shown in the accompanying drawings are not drawn according to actual scale.

[0018] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.

[0019] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0020] It should be noted that similar symbols and letters in the following figures represent similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures.

[0021] Furthermore, in the description of the embodiments of this application, the terms "first," "second," etc., are used only for distinguishing descriptions and should not be construed as indicating or implying relative importance. Therefore, features defined with "first" or "second" may explicitly or implicitly include one or more features.

[0022] To address the problem of heat redundancy in the thermal storage subsystem of existing compressed air energy storage systems, this application proposes a redundant heat absorption device to absorb redundant heat in the thermal storage subsystem of the compressed air energy storage system. Specifically, the redundant heat is absorbed through a heat exchange device.

[0023] The heat storage media in compressed air energy storage systems mainly include water, molten salt, and heat transfer oil. Due to the different heat storage media, the redundant heat dissipation devices are slightly different. The redundant heat dissipation device for water has one structure, while the redundant heat dissipation devices for molten salt and heat transfer oil have another structure.

[0024] For ease of description, the thermal storage subsystem using water as the thermal storage medium is defined as the first subsystem, and the thermal storage subsystem using molten salt or heat transfer oil as the thermal storage medium is defined as the second subsystem. The aforementioned redundant heat dissipation device may include at least: If the thermal storage subsystem is the first subsystem, the redundant heat absorption device includes a first heat exchange device. The first path of the first heat exchange device is connected in parallel with the inlet pipe of the low-temperature thermal storage medium tank in the first subsystem, and the second path of the first heat exchange device is externally connected to a first medium supply device. When the redundant heat is absorbed, all the low-temperature thermal storage medium flowing into the low-temperature thermal storage medium tank passes through the first heat exchange device. The temperature of the first medium is lower than the temperature of the low-temperature thermal storage medium.

[0025] To control the flow direction of the low-temperature thermal storage medium and the temperature during redundant heat dissipation, in some embodiments, the first heat exchange device can be equipped with an isolation device and a regulating device. The specific structure can be as follows: The first heat exchanger's first path inlet is sequentially equipped with a first isolation device 11, a first regulating device 32, and a second isolation device 12; the first heat exchanger's first path outlet is equipped with a third isolation device 13. A fourth isolation device 14 is installed on the inlet pipe of the cryogenic storage medium tank between the first connection point and the second connection point; wherein, the first connection point is the connection between the inlet of the first heat exchanger's first path and the inlet pipe of the cryogenic storage medium tank, and the second connection point is the connection between the outlet of the first heat exchanger's first path and the inlet pipe of the cryogenic storage medium tank. The inlet and outlet of the first heat exchanger's second path are respectively equipped with a fifth isolation device 15 and a sixth isolation device 16.

[0026] When no redundant heat is absorbed, the fourth isolation device 14 is opened (i.e., the pipeline is connected), and the first isolation device 11, the second isolation device 12, the third isolation device 13, the fifth isolation device 15 and the sixth isolation device 16 are all closed. At this time, the first heat exchange device does not work.

[0027] When redundant heat is absorbed, the fourth isolation device 14 is closed, and the first isolation device 11, the second isolation device 12, the third isolation device 13, the fifth isolation device 15 and the sixth isolation device 16 are all opened. At this time, the first heat exchange device works and further reduces the temperature of the low-temperature heat storage medium through heat exchange.

[0028] It should be noted that the first medium supply device is mainly a first medium circulation device. The first medium is a coolant, such as cooling water. The coolant circulation device can continuously circulate the low-temperature coolant to the second path of the first heat exchange device, thereby realizing the heat exchange between the coolant and the low-temperature heat storage medium.

[0029] It should be noted that the current compressed air energy storage system has a built-in cooling subsystem, and the coolant is cooling water. In order to save costs, in some embodiments, the cooling subsystem in the compressed air energy storage system can be directly used as the first medium supply device. The inlet and outlet of the second path of the first heat exchange device are respectively connected to the outlet of the circulating pump 6 of the cooling subsystem and the inlet of the cooling tower 5.

[0030] The first heat exchange device mentioned above can be a common shell-and-tube heat exchanger, specifically defined as bypass heat exchanger 26, see [link to relevant documentation]. Figure 1 The first subsystem includes a low-temperature water tank 28 and a high-temperature water tank 29. The output end of the low-temperature water tank 28 is connected to the second inlet of the compression-side water-air heat exchanger 3. The second outlet of the compression-side water-air heat exchanger 3 is connected to the inlet of the high-temperature water tank 29. The outlet of the high-temperature water tank 29 is connected to the second inlet of the expansion-side water-air heat exchanger 8. The second outlet of the expansion-side water-air heat exchanger 8 is connected to one end of the fourth isolation device 14 and one end of the second isolation device 12. The other end of the second isolation device 12 is connected in sequence to the first regulating device 32, the first isolation device 11, and the first inlet of the bypass heat exchanger 26. The first outlet of the bypass heat exchanger 26 is connected to one end of the third isolation device 13. The other end of the third isolation device 13 is connected to the other end of the fourth isolation device 14 and the inlet of the low-temperature water tank 28. The second inlet of the bypass heat exchanger 26 is connected to the outlet of the circulating pump 6 through the fifth isolation device 15. The second outlet of the bypass heat exchanger 26 is connected to the inlet of the cooling tower 5 through the sixth isolation device 16.

[0031] When absorbing redundant heat, first open the fifth isolation device 15 and the sixth isolation device 16 to establish cooling water circulation, then open the first isolation device 11, the second isolation device 12 and the third isolation device 13, and close the fourth isolation device 14. By adjusting the opening degree of the first regulating device 32, the temperature of the hot water stored at the first outlet of the bypass heat exchanger 26 is controlled to be maintained at the first preset value, such as 59°C.

[0032] If the thermal storage subsystem is the second subsystem, the redundant heat absorption device includes a second heat exchanger. The inlet and outlet of the second heat exchanger are respectively connected to the outlet of the high-temperature thermal storage medium tank and the inlet of the low-temperature thermal storage medium tank in the second subsystem. The first path of the second heat exchanger is externally connected to a second medium supply device. During redundant heat absorption, all the high-temperature thermal storage medium output from the high-temperature thermal storage medium tank flows into the low-temperature thermal storage medium tank through the second path of the second heat exchanger. The temperature of the second medium is lower than that of the high-temperature thermal storage medium.

[0033] To control the flow direction of the high-temperature heat storage medium and the temperature during redundant heat absorption, in some embodiments, the second heat exchange device can be equipped with an isolation device and a regulating device. The specific structure can be as follows: The inlet of the second path of the second heat exchanger is equipped with a seventh isolation device 17; the outlet of the second path of the second heat exchanger is equipped with an eighth isolation device 18, a second regulating device 33, and a ninth isolation device 19 in sequence. In the outlet pipeline of the high-temperature heat storage medium tank, a tenth isolation device 20 is installed downstream of the third connection; wherein, the third connection is the connection between the inlet of the second path of the second heat exchanger and the outlet pipeline of the high-temperature heat storage medium tank; the inlet and outlet of the first path of the second heat exchanger are equipped with an eleventh isolation device 21 and a twelfth isolation device 22, respectively.

[0034] When no redundant heat is absorbed, the tenth isolation device 20 is open, and the seventh isolation device, the eighth isolation device 18, the ninth isolation device 19, the eleventh isolation device 21 and the twelfth isolation device 22 are all closed. At this time, the second heat exchange device does not work.

[0035] When redundant heat is absorbed, the tenth isolation device 20 is closed, and the seventh isolation device, the eighth isolation device 18, the ninth isolation device 19, the eleventh isolation device 21 and the twelfth isolation device 22 are all opened. At this time, the second heat exchange device works and transforms the high-temperature heat storage medium into a low-temperature heat storage medium through heat exchange.

[0036] It should be noted that the second medium supply device is mainly a second medium circulation device, and the second medium can be water. If the compressed air energy storage system includes a first subsystem and a second subsystem, in order to save costs, in some embodiments, the first subsystem can be used as the second medium supply device, the inlet of the first path of the second heat exchange device is connected to the outlet of the high-temperature heat storage medium tank in the first subsystem, and the outlet of the first path of the second heat exchange device is connected to the external heating network.

[0037] The second heat exchange device mentioned above can be a common shell-and-tube heat exchanger, or it can be a cooling steam generator 27. The cooling steam generator 27 is more effective, therefore the second heat exchange device here is the cooling steam generator 27. See [link to relevant documentation]. Figure 2Using molten salt as the heat storage medium, the second system includes a low-temperature salt tank 31 and a high-temperature salt tank 30. The output end of the low-temperature salt tank 31 is connected to the second inlet of the compression-side salt-gas heat exchanger 2, and the second outlet of the compression-side salt-gas heat exchanger 2 is connected to the inlet of the high-temperature salt tank 30. The outlets of the high-temperature salt tank 30 are connected to one end of the seventh isolation device 17 and one end of the tenth isolation device 20, respectively. The other end of the seventh isolation device 17 is connected to the second inlet of the cooling steam generator 27, and the outlet of the second outlet of the cooling steam generator 27 is connected to the eighth isolation device 18 in sequence. The inlet of the second regulating device 33, the ninth isolation device 19 and the low-temperature salt tank 31, and the other end of the tenth isolation device 20 are connected to the second inlet of the expansion side salt-gas heat exchanger 9. The second outlet of the expansion side salt-gas heat exchanger 9 is connected to the inlet of the ninth isolation device 19 and the low-temperature salt tank 31 respectively. The inlet of the first path of the cooling steam generator 27 is connected to the outlet of the high-temperature water tank 29 through the eleventh isolation device 21. The outlet of the first path of the cooling steam generator 27 is connected to the heating network in sequence through the twelfth isolation device 22 and the check device 25.

[0038] When absorbing redundant heat, first close the tenth isolation device 20, then open the seventh isolation device 17, the eighth isolation device 18 and the ninth isolation device 19 to establish molten salt circulation. After that, open the eleventh isolation device 21, the twelfth isolation device 22 and the check device 25. By adjusting the opening of the second regulating device 33, control the molten salt temperature at the second outlet of the cooling steam generator 27 to maintain at the second preset value, such as 180°C.

[0039] It should be noted that all the above-mentioned isolation devices are isolation valves, the regulating devices are regulating valves, and the check device 25 is a check valve.

[0040] The aforementioned redundant heat absorption device is equipped with a bypass cooling system, which uses a heat exchange device to absorb the redundant heat in the heat storage medium, improves the phenomenon of thermodynamic parameters deviating from the preset threshold, ensures that the compressed air energy storage system always operates in the design state, and improves the unit's operational stability.

[0041] An embodiment of this application also provides a method for redundant heat dissipation, specifically a method for redundant heat dissipation using the aforementioned redundant heat dissipation device, which may include at least the following steps: If the thermal storage subsystem is the first subsystem, control all the low-temperature thermal storage medium flowing into the low-temperature thermal storage medium tank to pass through the first heat exchange device, control the flow rate of the low-temperature thermal storage medium in the first path of the first heat exchange device, and maintain the temperature of the low-temperature thermal storage medium entering the low-temperature thermal storage medium tank at the first preset value.

[0042] by Figure 1Taking the structure as an example, when absorbing redundant heat, the fifth isolation device 15 and the sixth isolation device 16 are opened first to establish the cooling water circulation. Then, the first isolation device 11, the second isolation device 12 and the third isolation device 13 are opened, and the fourth isolation device 14 is closed. By adjusting the opening degree of the first regulating device 32, the cooling water temperature of the first outlet of the bypass heat exchanger 26 is controlled to be maintained at the first preset value.

[0043] If the thermal storage subsystem is the second subsystem, the high-temperature thermal storage medium output from the high-temperature thermal storage medium tank is controlled to flow into the low-temperature thermal storage medium tank through the second path of the second heat exchange device. The flow rate of the high-temperature thermal storage medium in the second path of the second heat exchange device is controlled to maintain the temperature of the low-temperature thermal storage medium input into the low-temperature thermal storage medium tank at the second preset value.

[0044] by Figure 2 Taking the structure as an example, when absorbing redundant heat, the tenth isolation device 20 is closed first, and the seventh isolation device 17, the eighth isolation device 18 and the ninth isolation device 19 are opened. After establishing the molten salt circulation, the eleventh isolation device 21, the twelfth isolation device 22 and the backstop device 25 are opened. By adjusting the opening degree of the second regulating device 33, the molten salt temperature at the second outlet of the cooling steam generator 27 is controlled to be maintained at the second preset value.

[0045] The above-mentioned method for absorbing redundant heat improves the phenomenon of thermodynamic parameters deviating from the preset threshold by adding a bypass cooling system and using a heat exchange device to absorb redundant heat in the heat storage medium, ensuring that the compressed air energy storage system always operates in the design state and improving the stability of unit operation.

[0046] See Figure 3 The embodiments of this application also disclose a complete compressed air energy storage system, specifically by adding the aforementioned redundant heat dissipation device to the existing compressed air energy storage system.

[0047] The compressor 1, the first path of the compression-side salt-gas heat exchanger 2, the first path of the compression-side water-gas heat exchanger 3, the first path of the compression-side cooler 4, and one end of the thirteenth isolation device 23 (i.e., the thirteenth isolation valve) are connected in sequence. The outlet of the second path of the compression-side cooler 4 is connected in sequence to the cooling tower 5 and the circulating pump 6. The outlet of the circulating pump 6 is connected to the inlet of the second path of the compression-side cooler 4. The other end of the thirteenth isolation device 23 is connected to the inlet of the gas storage tank 7. The outlet of the gas storage tank 7 is connected in sequence to the fourteenth isolation device 24 (i.e., the fourteenth isolation valve), the first path of the expansion-side water-gas heat exchanger 8, the first path of the expansion-side salt-gas heat exchanger 9, and the turbine 10.

[0048] The output end of the low-temperature water tank 28 is connected to the second inlet of the compression-side water-air heat exchanger 3. The second outlet of the compression-side water-air heat exchanger 3 is connected to the inlet of the high-temperature water tank 29. The outlet of the high-temperature water tank 29 is connected to the second inlet of the expansion-side water-air heat exchanger 8. The second outlet of the expansion-side water-air heat exchanger 8 is connected to one end of the fourth isolation device 14 and one end of the second isolation device 12. The other end of the second isolation device 12 is connected in sequence to the first regulating device 32, the first isolation device 11, and the first inlet of the bypass heat exchanger 26. The first outlet of the bypass heat exchanger 26 is connected to one end of the third isolation device 13. The other end of the third isolation device 13 is connected to the other end of the fourth isolation device 14 and the inlet of the low-temperature water tank 28. The second inlet of the bypass heat exchanger 26 is connected to the outlet of the circulating pump 6 through the fifth isolation device 15. The second outlet of the bypass heat exchanger 26 is connected to the inlet of the cooling tower 5 through the sixth isolation device 16.

[0049] The output end of the low-temperature salt tank 31 is connected to the second inlet of the compression-side salt-gas heat exchanger 2. The second outlet of the compression-side salt-gas heat exchanger 2 is connected to the inlet of the high-temperature salt tank 30. The outlet of the high-temperature salt tank 30 is connected to one end of the seventh isolation device 17 and one end of the tenth isolation device 20. The other end of the seventh isolation device 17 is connected to the second inlet of the cooling steam generator 27. The outlet of the second outlet of the cooling steam generator 27 is connected in sequence to the eighth isolation device 18, the second regulating device 33, the ninth isolation device 19 and the inlet of the low-temperature salt tank 31. The other end of the tenth isolation device 20 is connected to the second inlet of the expansion-side salt-gas heat exchanger 9. The second outlet of the expansion-side salt-gas heat exchanger 9 is connected to the ninth isolation device 19 and the inlet of the low-temperature salt tank 31. The first inlet of the cooling steam generator 27 is connected to the outlet of the high-temperature water tank 29 through the eleventh isolation device 21. The first outlet of the cooling steam generator 27 is connected to the heating network through the twelfth isolation device 22 and the check device 25.

[0050] When the above-mentioned compressed air energy storage system is running, the two subsystems activate the corresponding redundant heat dissipation devices as needed based on whether the temperature of the heat storage medium deviates from the design value. The working process of the redundant heat dissipation devices will not be repeated here. The working process of the entire system on the compression side and expansion side is as follows: Compressor 1 compresses the intake air to obtain high-pressure gas. The high-pressure gas is sequentially fed into the compression-side salt-gas heat exchanger 2, the compression-side water-gas heat exchanger 3, and the compression-side cooler 4 for cooling, and then fed into the gas storage tank 7. The high-pressure gas stored in the gas storage tank 7 is sequentially fed into the expansion-side water-gas heat exchanger 8 and the expansion-side salt-gas heat exchanger 9 for heating, and then fed into the turbine 10. The high-temperature and high-pressure gas enters the turbine 10 to expand and do work, and the cooled air after doing work is discharged into the atmosphere. Among them, the first subsystem and the second subsystem exchange heat with the air during the compression-side cooling and expansion-side heating processes.

[0051] The above system is equipped with a redundant heat absorption device. By adding a bypass cooling system, the redundant heat in the heat storage medium can be absorbed by the heat exchange device, which can improve the phenomenon of thermodynamic parameters deviating from the preset threshold, ensure that the compressed air energy storage system always operates in the design state, and improve the stability of unit operation.

[0052] The above description is only a preferred embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of this invention, and these improvements and modifications should also be considered within the scope of protection of this invention.

Claims

1. A redundant heat sink device, comprising: To accommodate redundant heat in a heat storage subsystem of a compressed air energy storage system; If the heat storage subsystem is a first subsystem, the redundant heat accommodation device comprises a first heat exchange device, a first path of the first heat exchange device is connected in parallel with an inlet pipeline of a low-temperature heat storage medium tank in the first subsystem, and a second path of the first heat exchange device is externally connected with a first medium providing device; during the accommodation of the redundant heat, low-temperature heat storage medium flowing into the low-temperature heat storage medium tank all passes through the first heat exchange device; wherein the first subsystem is a heat storage subsystem with water as the heat storage medium; the temperature of the first medium is lower than the temperature of the low-temperature heat storage medium; If the heat storage subsystem is a second subsystem, the redundant heat accommodation device comprises a second heat exchange device, an inlet of a second path of the second heat exchange device is connected with an outlet of a high-temperature heat storage medium tank in the second subsystem, and an outlet of the second path is connected with an inlet of a low-temperature heat storage medium tank in the second subsystem, and a first path of the second heat exchange device is externally connected with a second medium providing device; during the accommodation of the redundant heat, high-temperature heat storage medium output by the high-temperature heat storage medium tank all flows into the low-temperature heat storage medium tank through the second path of the second heat exchange device; wherein the second subsystem is a heat storage subsystem with molten salt or heat-conducting oil as the heat storage medium; the temperature of the second medium is lower than the temperature of the high-temperature heat storage medium.

2. The apparatus of claim 1, wherein, An inlet of the first path of the first heat exchange device is provided with a first blocking device, a first adjusting device and a second blocking device in sequence; and an outlet of the first path of the first heat exchange device is provided with a third blocking device. A fourth blocking device is arranged on the inlet pipeline of the low-temperature heat storage medium tank between a first connection position and a second connection position; wherein the first connection position is a connection position of the inlet of the first path of the first heat exchange device and the inlet pipeline of the low-temperature heat storage medium tank, and the second connection position is a connection position of the outlet of the first path of the first heat exchange device and the inlet pipeline of the low-temperature heat storage medium tank. An inlet of the second path of the first heat exchange device is provided with a fifth blocking device, and an outlet of the second path is provided with a sixth blocking device.

3. The apparatus of claim 1, wherein, The first medium providing device is a cooling subsystem in the compressed air energy storage system, and the inlet and the outlet of the second path of the first heat exchange device are connected with an outlet of a circulating pump of the cooling subsystem and an inlet of a cooling tower respectively.

4. The device of any one of claims 1 to 3, wherein, The first heat exchange device is a tube-shell heat exchanger.

5. The apparatus of claim 1, wherein, An inlet of the second path of the second heat exchange device is provided with a seventh blocking device, and an outlet of the second path is provided with an eighth blocking device, a second adjusting device and a ninth blocking device in sequence. A tenth blocking device is arranged downstream of a third connection position in the outlet pipeline of the high-temperature heat storage medium tank; wherein the third connection position is a connection position of the inlet of the second path of the second heat exchange device and the outlet pipeline of the high-temperature heat storage medium tank. An inlet of the first path of the second heat exchange device is provided with an eleventh blocking device, and an outlet of the first path is provided with a twelfth blocking device.

6. The apparatus of claim 1, wherein, If the compressed air energy storage system comprises the first subsystem and the second subsystem; The second medium providing device is the first subsystem, the inlet of the first path of the second heat exchange device is connected with the outlet of the high-temperature heat storage medium tank in the first subsystem, and the outlet of the first path of the second heat exchange device is externally connected with a heat supply pipe network.

7. The apparatus of any one of claims 1, 5-6, wherein, The second heat exchange device is a cooling steam generator.

8. A method of redundant heat sinking, comprising: The device of any one of claims 1-7 is used for accommodating redundant heat, and the method comprises: If the heat storage subsystem is the first subsystem, all of the low-temperature heat storage medium flowing into the low-temperature heat storage medium tank is controlled to pass through the first heat exchange device, the flow of the low-temperature heat storage medium in the first path of the first heat exchange device is controlled, and the temperature of the low-temperature heat storage medium input into the low-temperature heat storage medium tank is maintained at a first preset value; If the heat storage subsystem is the second subsystem, all of the high-temperature heat storage medium output by the high-temperature heat storage medium tank is controlled to flow into the low-temperature heat storage medium tank through the second path of the second heat exchange device, the flow of the high-temperature heat storage medium in the second path of the second heat exchange device is controlled, and the temperature of the low-temperature heat storage medium input into the low-temperature heat storage medium tank is maintained at a second preset value.

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