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] The present invention relates to a redundant heat dissipation device and method for a compressed air energy storage system, belonging to the technical field of compressed air energy storage systems. Background Art

[0002] Non-supplementary compressed air energy storage (CAES) technology is a large-scale physical energy storage solution based on thermodynamic cycles. Its technical system comprises three core modules: air compression, gas storage, and expansion power generation. Unlike traditional supplementary-fired CAES, which relies on natural gas combustion to raise turbine inlet temperature (with an efficiency of 42%-55%, subject to carbon emissions and fuel dependency), this new technology achieves zero-carbon operation through thermodynamic optimization. During periods of low power load, a multi-stage compressor pressurizes air to 5-15 MPa, recovering the heat of compression in a cascade using phase change materials or molten salt systems. The high-pressure air is stored in underground salt caverns or artificial tanks. During energy release, the heat storage system preheats the air to drive the turbine for power generation, eliminating the need for reheating in the combustion chamber.

[0003] Currently, the engineering application of non-supplementary fired compressed air energy storage technology still faces many challenges. The heat storage medium of large-capacity compressed air energy storage units that have been put into production, trial operation or are under construction mostly uses composite heat storage media with good heat transfer performance and stable physical properties such as water, molten salt, and thermal oil to construct a cascade heat storage array. During the energy storage stage, the heat storage medium is used to absorb the high-quality compression heat generated by the compressor unit through a heat exchanger. During the energy release stage, the compression heat is fed back to the high-pressure air through a heat exchanger. The air enters the turbine and expands to generate electricity to support the power balance of the power grid. Different from the continuous and uninterrupted operation characteristics of thermal power units, the compression and expansion sides of compressed air energy storage units have the operating characteristics of temporal decoupling. Therefore, the energy balance of the heat storage system is mostly designed and calculated based on the unit operating at a stable load. During actual operation, the unit is subject to unfavorable factors such as the start-stop characteristics of the host equipment, the dynamic response requirements of frequent grid scheduling, and the discontinuity of the unit during commissioning, which leads to heat redundancy in the heat storage subsystem, further causing the thermodynamic parameters of the storage / release process to deviate from the preset threshold, and then causing the compressed air energy storage system to deviate from the design state, affecting the stability of the unit operation. Summary of the Invention

[0004] The present invention provides a redundant heat dissipation device and method for a compressed air energy storage system, which solves the problems disclosed in the background technology.

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

[0006] Furthermore, the inlet of the first path of the first heat exchange device is provided with a first partition device, a first regulating device and a second partition device in sequence; the outlet of the first path of the first heat exchange device is provided with a third partition device; A fourth partition device is provided on the low-temperature heat storage medium tank inlet pipeline between the first connection point and the second connection point; wherein the first connection point is the connection point between the inlet of the first path of the first heat exchange device and the low-temperature heat storage medium tank inlet pipeline, and the second connection point is the connection point between the outlet of the first path of the first heat exchange device and the low-temperature heat storage medium tank inlet pipeline; The inlet and outlet of the second path of the first heat exchange device are respectively provided with a fifth partition device and a sixth partition device.

[0007] Furthermore, the first medium providing 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 cooling subsystem circulation pump 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 exchange device is provided with a seventh partition device; the outlet of the second path of the second heat exchange device is provided with an eighth partition device, a second regulating device and a ninth partition device in sequence; In the high-temperature heat storage medium tank outlet pipeline, a tenth partition device is provided downstream of the third connection point; wherein the third connection point is the connection point between the inlet of the second path of the second heat exchange device and the high-temperature heat storage medium tank outlet pipeline; The inlet and outlet of the first path of the second heat exchange device are respectively provided with an eleventh partition device and a twelfth partition device.

[0010] Furthermore, if the compressed air energy storage system includes a first subsystem and a 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 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 externally connected to the heating pipe network.

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

[0012] According to another aspect of the present application, a redundant heat dissipation method is provided, wherein the redundant heat dissipation device is used to dissipate redundant heat, and the method comprises: If the heat storage subsystem is the first subsystem, controlling the low-temperature heat storage medium flowing into the low-temperature heat storage medium tank to pass through the first heat exchange device, and controlling the flow rate of the low-temperature heat storage medium in the first path of the first heat exchange device to maintain the temperature of the low-temperature heat storage medium input into the low-temperature heat storage medium tank at a first preset value; If the heat storage subsystem is the second subsystem, the high-temperature heat storage medium output from 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, and the flow rate of the high-temperature heat storage medium in the second path of the second heat exchange device is controlled to maintain the temperature of the low-temperature heat storage medium input into the low-temperature heat storage medium tank at a second preset value.

[0013] The beneficial effects achieved by the present invention are as follows: By adding a bypass cooling system and adopting a heat exchange device to dissipate the redundant heat in the heat storage medium, the present invention improves the phenomenon of thermodynamic parameters deviating from the preset threshold value, ensures that the compressed air energy storage system always operates in the designed state, and improves the operating stability of the unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 Schematic diagram of the structure of the redundant heat absorption device when the heat storage subsystem is the first subsystem; Figure 2 Schematic diagram of the structure of the redundant heat absorption device when the heat storage subsystem is the second subsystem; Figure 3 Schematic diagram of the structure of the compressed air energy storage system. DETAILED DESCRIPTION

[0015] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. It is obvious that the embodiments described are only part of the embodiments of the present application, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

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

[0017] At the same time, it should be understood that for the convenience of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship.

[0018] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, 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 limiting. Therefore, other examples of the exemplary embodiments may have different values.

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

[0021] At the same time, in the description of the embodiments of this application, the terms "first" and "second" are used only to distinguish the description and should not be understood as indicating or implying relative importance. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more features.

[0022] In order to solve the problem caused by heat redundancy in the heat storage subsystem of the existing compressed air energy storage system, the present application proposes a redundant heat absorption device to absorb the redundant heat in the heat storage subsystem of the compressed air energy storage system, specifically, to absorb the redundant heat through a heat exchange device.

[0023] The heat storage media in the compressed air energy storage system mainly include water, molten salt, thermal oil, etc. Due to the different heat storage media, there are slight differences in the redundant heat absorption devices. Among them, the redundant heat absorption device corresponding to water has one structure, and the redundant heat absorption device corresponding to molten salt and thermal oil has another structure.

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

[0025] In order to control the flow direction of the low-temperature heat storage medium and the temperature during the redundant heat absorption, in some embodiments, the first heat exchange device may be equipped with a partition device and a regulating device. The specific structure may be as follows: The inlet of the first circuit of the first heat exchanger is sequentially installed with a first partition device 11, a first regulating device 32, and a second partition device 12; the outlet of the first circuit of the first heat exchanger is installed with a third partition device 13. A fourth partition device 14 is installed on the low-temperature heat storage medium tank inlet pipeline between the first connection point and the second connection point; the first connection point is the connection between the inlet of the first circuit of the first heat exchanger and the low-temperature heat storage medium tank inlet pipeline, and the second connection point is the connection between the outlet of the first circuit of the first heat exchanger and the low-temperature heat storage medium tank inlet pipeline. A fifth partition device 15 and a sixth partition device 16 are installed at the inlet and outlet of the second circuit of the first heat exchanger, respectively.

[0026] When redundant heat absorption is not performed, the fourth partition device 14 is opened (i.e., the pipeline is connected), the first partition device 11, the second partition device 12, the third partition device 13, the fifth partition device 15 and the sixth partition device 16 are all closed, and the first heat exchange device does not work.

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

[0028] It should be noted that the first medium providing device is mainly a first medium circulation device, and 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 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 its own cooling subsystem, and the coolant uses 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 providing device, and the inlet and outlet of the second path of the first heat exchange device are respectively connected to the outlet of the cooling subsystem circulation pump 6 and the inlet of the cooling tower 5.

[0030] The first heat exchange device can be a common shell and tube heat exchanger, specifically defined as a bypass heat exchanger 26, see 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-gas heat exchanger 3, the second outlet of the compression-side water-gas 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-gas heat exchanger 8, the second outlet of the expansion-side water-gas heat exchanger 8 is respectively connected to one end of the fourth partition device 14 and one end of the second partition device 12, the other end of the second partition device 12 is connected in sequence to the first regulating device 32, the first partition 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 partition device 13, the other end of one end of the third partition device 13 is respectively connected to the other end of the fourth partition 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 circulation pump 6 through the fifth partition device 15, and the second outlet of the bypass heat exchanger 26 is connected to the inlet of the cooling tower 5 through the sixth partition device 16.

[0031] When absorbing redundant heat, first open the fifth partition device 15 and the sixth partition device 16. After the cooling water circulation is established, open the first partition device 11, the second partition device 12 and the third partition device 13, close the fourth partition device 14, and control the temperature of the hot water stored at the first outlet of the bypass heat exchanger 26 to maintain at a first preset value, such as 59°C, by adjusting the opening of the first regulating device 32.

[0032] If the heat 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 heat storage medium tank and the inlet of the low-temperature heat storage medium tank in the second subsystem, and 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 heat storage medium output from the high-temperature heat storage medium tank flows into the low-temperature heat storage medium tank through the second path of the second heat exchange device; wherein the temperature of the second medium is lower than that of the high-temperature heat storage medium.

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

[0034] When redundant heat absorption is not performed, the tenth partition device 20 is opened, the seventh partition device, the eighth partition device 18, the ninth partition device 19, the eleventh partition device 21 and the twelfth partition device 22 are all closed, and the second heat exchange device does not work.

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

[0036] It should be noted that the second medium supply device is primarily 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, to save costs, in some embodiments, the first subsystem can serve as the second medium supply device, with the inlet of the first circuit of the second heat exchange device connected to the outlet of the high-temperature heat storage medium tank in the first subsystem, and the outlet of the first circuit of the second heat exchange device connected to an external heating network.

[0037] The second heat exchange device can be a common shell and tube heat exchanger or a cooling steam generator 27. The cooling steam generator 27 has a better effect. Therefore, the second heat exchange device here is the cooling steam generator 27. Figure 2, using 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, 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 respectively connected to one end of the seventh partition device 17 and one end of the tenth partition device 20, the other end of the seventh partition device 17 is connected to the inlet of the second route of the cooling steam generator 27, and the outlet of the second route of the cooling steam generator 27 is sequentially connected to the eighth partition device 18 , the second regulating device 33, the ninth partition device 19 and the inlet of the low-temperature salt tank 31, the other end of the tenth partition device 20 is connected to the second inlet of the expansion side salt-gas heat exchanger 9, and the second outlet of the expansion side salt-gas heat exchanger 9 is respectively connected to the inlet of the ninth partition device 19 and 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 partition device 21, and the first outlet of the cooling steam generator 27 is connected to the heating network through the twelfth partition device 22 and the check device 25 in sequence.

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

[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 above-mentioned redundant heat absorption device is equipped with a bypass cooling system, and a heat exchange device is used to absorb the redundant heat in the heat storage medium, thereby improving the phenomenon of thermodynamic parameters deviating from the preset threshold value, ensuring that the compressed air energy storage system always operates in the designed state, and improving the operating stability of the unit.

[0041] The embodiments of the present application further provide a redundant heat dissipation method, specifically a method for dissipating redundant heat using the redundant heat dissipation device described above. The method may include at least the following steps: If the heat storage subsystem is the first subsystem, 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, and the flow rate of the low-temperature heat storage medium in the first path of the first heat exchange device is controlled to maintain the temperature of the low-temperature heat storage medium input into the low-temperature heat storage medium tank at a first preset value.

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

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

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

[0045] The above redundant heat absorption method adds a bypass cooling system and adopts a heat exchange device to absorb the redundant heat in the heat storage medium, thereby improving the phenomenon of thermodynamic parameters deviating from the preset threshold, ensuring that the compressed air energy storage system always operates in the designed state, and improving the operating stability of the unit.

[0046] See also Figure 3 The embodiment of the present application also discloses a complete compressed air energy storage system, specifically adding the above-mentioned redundant heat absorption device to the existing compressed air energy storage system.

[0047] The compressor 1, the first line of the compression-side salt-gas heat exchanger 2, the first line of the compression-side water-gas heat exchanger 3, the first line of the compression-side cooler 4, and one end of the thirteenth isolating device 23 (i.e., the thirteenth isolating valve) are connected in sequence. The outlet of the second line 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 line of the compression-side cooler 4. The other end of the thirteenth isolating device 23 is connected to the inlet of the gas storage reservoir 7. The outlet of the gas storage reservoir 7 is connected in sequence to the fourteenth isolating device 24 (i.e., the fourteenth isolating valve), the first line of the expansion-side water-gas heat exchanger 8, the first line 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-gas heat exchanger 3, the second outlet of the compression-side water-gas 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-gas heat exchanger 8, the second outlet of the expansion-side water-gas heat exchanger 8 is respectively connected to one end of the fourth partition device 14 and one end of the second partition device 12, the other end of the second partition device 12 is connected to the first regulating device 32, the first partition device 11 and the first inlet of the bypass heat exchanger 26 in sequence, the first outlet of the bypass heat exchanger 26 is connected to one end of the third partition device 13, the other end of one end of the third partition device 13 is respectively connected to the other end of the fourth partition 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 circulation pump 6 through the fifth partition device 15, and the second outlet of the bypass heat exchanger 26 is connected to the inlet of the cooling tower 5 through the sixth partition 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, 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 outlet of the high-temperature salt tank 30 is respectively connected to one end of the seventh partition device 17 and one end of the tenth partition device 20. The other end of the seventh partition device 17 is connected to the second inlet of the cooling steam generator 27. The second outlet of the cooling steam generator 27 is connected to the eighth partition device 18, the second regulating device 33, the ninth partition device 19 and the inlet of the low-temperature salt tank 31 in sequence. The other end of the tenth partition 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 respectively connected to the ninth partition 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 partition device 21. The first outlet of the cooling steam generator 27 is connected to the heating pipe network through the twelfth partition device 22 and the check device 25 in sequence.

[0050] When the compressed air energy storage system is in operation, the two subsystems activate the corresponding redundant heat absorption device as needed based on whether the temperature of the heat storage medium deviates from the design value. The working process of the redundant heat absorption device will not be repeated here; the working process of the compression side and the expansion side of the entire system is as follows: the compressor 1 compresses the inhaled air to obtain high-pressure gas, which is sequentially input into the compression side salt-air heat exchanger 2, the compression side water-air heat exchanger 3, and the compression side cooler 4 for cooling, and then input into the gas storage reservoir 7; the high-pressure gas stored in the gas storage reservoir 7 is sequentially input into the expansion side water-air heat exchanger 8 and the expansion side salt-air heat exchanger 9 for heating, and then input into the turbine 10. The high-temperature and high-pressure gas enters the turbine 10 to expand and perform work, and the cold air after the work is discharged into the atmosphere; wherein, the first subsystem and the second subsystem both exchange heat with the air during the compression side cooling and expansion side heating processes.

[0051] A redundant heat absorption device has been added to the above system. By adding a bypass cooling system and using a heat exchange device to absorb the redundant heat in the heat storage medium, the phenomenon of thermodynamic parameters deviating from the preset threshold can be improved, ensuring that the compressed air energy storage system always operates in the designed state and improving the operating stability of the unit.

[0052] The above is only a preferred embodiment of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A redundant heat dissipation device, characterized in that: Used to absorb redundant heat in the thermal storage subsystem of the compressed air energy storage system; If the heat storage subsystem is the first subsystem, the redundant heat absorption device includes a first heat exchange device, a first path of the first heat exchange device is connected in parallel with the inlet pipeline of the low-temperature heat storage medium tank of the first subsystem, and a second path of the first heat exchange device is externally connected to a first medium supply device; during redundant heat absorption, all low-temperature heat storage medium flowing into the low-temperature heat storage medium tank passes through the first heat exchange device; wherein the first subsystem is a heat storage subsystem using water as the heat storage medium; and the temperature of the first medium is lower than that of the low-temperature heat storage medium; If the heat 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 heat storage medium tank and the inlet of the low-temperature heat storage medium tank in the second subsystem, and 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 heat storage medium output from the high-temperature heat storage medium tank 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 using molten salt or heat transfer oil as the heat storage medium; and the temperature of the second medium is lower than that of the high-temperature heat storage medium.

2. The device according to claim 1, characterized in that The inlet of the first path of the first heat exchange device is provided with a first partition device, a first regulating device and a second partition device in sequence; the outlet of the first path of the first heat exchange device is provided with a third partition device; A fourth partition device is provided on the low-temperature heat storage medium tank inlet pipeline between the first connection point and the second connection point; wherein the first connection point is the connection point between the inlet of the first path of the first heat exchange device and the low-temperature heat storage medium tank inlet pipeline, and the second connection point is the connection point between the outlet of the first path of the first heat exchange device and the low-temperature heat storage medium tank inlet pipeline; The inlet and outlet of the second path of the first heat exchange device are respectively provided with a fifth partition device and a sixth partition device.

3. The device according to claim 1, characterized in that The first medium providing device is the 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 connected to the outlet of the cooling subsystem circulation pump and the inlet of the cooling tower respectively.

4. The device according to any one of claims 1 to 3, characterized in that The first heat exchange device is a shell and tube heat exchanger.

5. The device according to claim 1, characterized in that The inlet of the second path of the second heat exchange device is provided with a seventh partition device; the outlet of the second path of the second heat exchange device is provided with an eighth partition device, a second regulating device and a ninth partition device in sequence; In the high-temperature heat storage medium tank outlet pipeline, a tenth partition device is provided downstream of the third connection point; wherein the third connection point is the connection point between the inlet of the second path of the second heat exchange device and the high-temperature heat storage medium tank outlet pipeline; The inlet and outlet of the first path of the second heat exchange device are respectively provided with an eleventh partition device and a twelfth partition device.

6. The device according to claim 1, characterized in that If the compressed air energy storage system includes a first subsystem and a 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 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 externally connected to the heating pipe network.

7. The device according to any one of claims 1, 5 to 6, characterized in that: The second heat exchange device is a cooling steam generator.

8. A method for absorbing redundant heat, characterized in that: The device according to any one of claims 1 to 7 is used to dissipate redundant heat, the method comprising: If the heat storage subsystem is the first subsystem, controlling the low-temperature heat storage medium flowing into the low-temperature heat storage medium tank to pass through the first heat exchange device, and controlling the flow rate of the low-temperature heat storage medium in the first path of the first heat exchange device to maintain the temperature of the low-temperature heat storage medium input into the low-temperature heat storage medium tank at a first preset value; If the heat storage subsystem is the second subsystem, the high-temperature heat storage medium output from 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, and the flow rate of the high-temperature heat storage medium in the second path of the second heat exchange device is controlled to maintain the temperature of the low-temperature heat storage medium input into the low-temperature heat storage medium tank at a second preset value.

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