Heat storage and exchange system, control method, control device and control system

Abstract

The invention provides a heat storage and exchange system, a control method, a control device and a control system.The heat storage and exchange system comprises a heat exchanger set, and air pipelines of a head-end heat exchanger, a tail-end heat exchanger and at least one intermediate heat exchanger are sequentially connected between an air compressor and an air storage device in series; the air pipeline of each heat exchanger is also communicated with an air compressor through a first regulating valve; a cooling pipeline of the head-end heat exchanger, a cooling pipeline of the at least one intermediate heat exchanger and the circulating pump are connected in series between the high-temperature tank and the low-temperature tank, and a second regulating valve communicated with the cooling pipeline of the head-end heat exchanger and a third regulating valve communicated with an inlet of the low-temperature tank are arranged at an outlet of the cooling pipeline of the at least one intermediate heat exchanger; through multi-stage heat exchange and / or multi-stage air inlet, the heat exchange temperature difference of the heat exchanger is small, and the temperature standard reaching rate of the heat exchange medium can be increased.

Description

Technical Field

[0001] This article relates to but is not limited to compressed air energy storage technology, and in particular to but is not limited to a heat storage and exchange system, a control method, a control device and a control system. Background Art

[0002] Since wind and solar power are volatile, intermittent, and random, their high proportion of access to the grid will bring about the risk of voltage and frequency fluctuations; in addition, with the continuous increase in social electricity consumption, the long-standing peak-valley load gap in the power system will further expand, causing great pressure on the safe and stable operation of the power system. Energy storage can controllably absorb, store, and release electric energy, thereby achieving the volatility smoothing of wind and solar power and peak-valley regulation of the power system. Therefore, energy storage is one of the key technologies supporting the transformation of the energy structure, among which the demand for clean, large-capacity, and long-term energy storage technology is the most urgent.

[0003] Compressed air energy storage is recognized as a large-capacity, long-term energy storage technology second only to pumped storage. At present, the working mode of the new compressed air energy storage system is as follows: when storing energy, the multi-stage compressor unit in series is driven by electric energy to absorb ambient air and compress it to high pressure, and a heat exchanger is set after each compressor to absorb and store the high-temperature compressed heat energy using a heat exchange medium, while cooling the compressed air. Therefore, the new compressed air energy storage system stores compressed heat energy and compressed air at the same time; when releasing energy, the compressed air released by the air storage device enters another heat exchanger to exchange heat with the heat exchange medium carrying compressed heat energy again, and becomes high-temperature compressed air after absorbing the compressed heat energy, and then enters the air expander to expand and do work, and drives the generator to generate electricity.

[0004] However, this new type of compressed air energy storage technology still faces some technical problems in the operation of the heat storage system when it is actually applied. First, in order to increase the intake temperature of the expander during energy release, the exhaust temperature of the compressor during energy storage must be increased, which leads to an increase in the heat exchange temperature difference of the heat exchanger after the compressor; since the compressed air energy storage system generally adopts a one-day start-stop operation mode, the large temperature difference caused by the start-stop will reduce the life of the heat exchanger; secondly, since the compressed air energy storage system generally adopts a one-day start-stop operation mode, after the heat exchanger has been shut down for a long time, factors such as heat leakage will cause the overall temperature of the heat exchanger to decrease. After the next unit is started, due to the heat capacity of the heat exchanger itself, the temperature of the heat exchanger heat exchange medium during the startup process and a period of time thereafter cannot reach the design temperature. This part of the heat exchange medium that does not meet the temperature standard will cause the system heat storage temperature to decrease; in addition, during the startup of the air compressor, the temperature of the compressor exhaust also gradually rises from low temperature to normal temperature. This process will also cause the heat exchange medium to fail to reach the design temperature during the startup of the unit, thereby causing the heat storage temperature to fail to meet the standard.

[0005] Therefore, it is urgent to design a compressed thermal energy storage and heat exchange system for new compressed air energy storage to solve the problem of reduced heat exchanger life caused by start-stop and the problem of heat storage temperature not meeting the standard during startup. Summary of the invention

[0006] The following is a summary of the subject matter described in detail herein. This summary is not intended to limit the scope of protection of the present disclosure.

[0007] The technical purpose to be achieved by the embodiments of the present disclosure is to provide a heat storage and exchange system, a control method, a control device and a control system to solve the problems of large heat exchange temperature difference and low heat storage temperature in the startup phase in the actual application of the current new compressed air energy storage technology.

[0008] In an embodiment of the present disclosure, a heat storage and exchange system for compressed air energy storage is provided, the heat storage and exchange system comprising: an air compressor, a heat exchanger group, a low temperature tank, a high temperature tank, a circulation pump, a first regulating valve and a second regulating valve;

[0009] The heat exchanger group includes: a head end heat exchanger, a terminal heat exchanger and an intermediate heat exchanger;

[0010] The head-end heat exchanger, the intermediate heat exchanger and the terminal heat exchanger are connected in series between the air compressor and the air storage device through an air pipeline;

[0011] A first regulating valve is provided on the air pipeline between the head-end heat exchanger and the air compressor;

[0012] A first tee is provided on the air pipeline between the head-end heat exchanger and the adjacent intermediate heat exchanger, on the air pipeline between two adjacent intermediate heat exchangers when there are more than two intermediate heat exchangers, and on the air pipeline between the terminal heat exchanger and the adjacent intermediate heat exchanger; one of the interfaces of the first tee is independently connected to the air compressor through the air pipeline and the first regulating valve;

[0013] The head-end heat exchanger, the intermediate heat exchanger and the circulating pump are connected in series between the inlet of the high-temperature tank and the outlet of the low-temperature tank through a cooling pipeline;

[0014] A second regulating valve and a second tee are provided on the cooling pipelines of the head-end heat exchanger and the adjacent intermediate heat exchanger, and one interface of the second tee is connected to the inlet of the low-temperature tank through a pipeline and a third regulating valve;

[0015] In some embodiments provided by the present disclosure, the cooling pipe of the terminal heat exchanger is connected to a cooling water circulation system, and the terminal heat exchanger exchanges heat independently.

[0016] In some embodiments provided in the present disclosure, the head-end heat exchanger is a heat exchanger in series that is directly connected to the heat exchanger of the air compressor, and the terminal heat exchanger is a heat exchanger in series that is directly connected to the air storage device.

[0017] In some embodiments provided by the present disclosure, the heat storage and exchange system further includes:

[0018] A first one-way valve, wherein the first one-way valve is arranged on air ducts of two adjacent heat exchangers;

[0019] The flow direction of the first one-way valve is a first direction from the air compressor to the air storage device.

[0020] In some embodiments provided by the present disclosure, the heat storage and exchange system further includes:

[0021] A second one-way valve is provided on a cooling pipeline between the low-temperature tank and the intermediate heat exchanger at the end along the first direction;

[0022] The flow direction of the second one-way valve is a second direction from the low-temperature tank to the high-temperature tank.

[0023] In some embodiments provided by the present disclosure, the heat storage and exchange system further includes:

[0024] A fourth regulating valve is arranged in the cooling pipe between two adjacent intermediate heat exchangers;

[0025] A fifth regulating valve has one end connected to the outlet of the cooling pipe of the intermediate heat exchanger and the other end connected to the inlet of the circulating pump.

[0026] The heat exchangers disclosed in the present invention can be divided into two categories. One category is the head-end heat exchanger and the intermediate heat exchanger. This type of heat exchanger enables the cooling medium to exchange heat with the compressed air step by step, and is used to extract the heat in the compressed air and store it in a high-temperature storage tank. This type of heat exchanger can be set to a single stage or multiple stages; the second type of heat exchanger is the terminal heat exchanger, which can also be set to a single stage or multiple stages, and both further cool the compressed air through an external cooling water circulation system.

[0027] In another aspect, a control method of a heat storage and exchange system is provided in an embodiment of the present disclosure. Using the above-mentioned heat storage and exchange system, the control method includes:

[0028] Acquire the start / stop conditions of the air compressor, the circulation pump, the first regulating valve, the second regulating valve, the third regulating valve, the fourth regulating valve and the fifth regulating valve of the heat storage and exchange system at the current moment, and the switch degrees of the first regulating valve, the second regulating valve, the third regulating valve, the fourth regulating valve and the fifth regulating valve;

[0029] Determining a corresponding target control strategy according to the start and stop conditions of the heat storage and exchange system;

[0030] The target control strategy includes: a first control strategy and a second control strategy, wherein the first control strategy is to control the heat exchange of the heat exchanger group at multiple stages, and the second control strategy is to control the heat exchange and air intake of the heat exchanger group at multiple stages;

[0031] According to the target control strategy, the start and stop of the air compressor and the circulation pump and the switching states and switching degrees of the first regulating valve, the second regulating valve, the third regulating valve, the fourth regulating valve and the fifth regulating valve are controlled.

[0032] In some embodiments provided by the present disclosure, according to the start and stop conditions of the heat storage and exchange system, a corresponding target control strategy is determined, including:

[0033] When the start-stop situation is the first start or the start-stop interval is greater than a preset duration, determining that the target control strategy is the first control strategy;

[0034] When the start-stop interval is less than or equal to the preset duration, the target control strategy is determined to be the second control strategy.

[0035] In some embodiments provided by the present disclosure, the first control strategy includes:

[0036] Only the first regulating valve corresponding to the head-end heat exchanger is controlled to be fully opened, and the other first regulating valves, the second regulating valves, the third regulating valves, the fourth regulating valves, the fifth regulating valves and the circulating pump are closed;

[0037] Starting the air compressor and the circulating pump, and simultaneously opening the fifth regulating valve, and simultaneously opening the terminal heat exchanger and its corresponding cooling water circulation system;

[0038] When the inlet air temperature of the last intermediate heat exchanger in the first direction reaches the second preset temperature, the fifth regulating valve is closed, and the fourth regulating valve and the third regulating valve are opened;

[0039] When the air inlet temperature of the first intermediate heat exchanger in the first direction reaches the third preset temperature, the opening of the third regulating valve is gradually reduced, and the opening of the second regulating valve is gradually opened, and the openings of the third regulating valve and the second regulating valve are controlled until the difference between the outflow temperature of the heat exchange medium of the head-end heat exchanger and the exhaust temperature of the compressor is close to the design end difference of the heat exchanger, the third regulating valve is closed, the second regulating valve is fully opened, the air compressor is started, and the system enters a stable operation state.

[0040] In some embodiments provided by the present disclosure, the second control strategy includes:

[0041] Only the first regulating valve corresponding to the terminal heat exchanger is controlled to be fully opened, and the other first regulating valves, the second regulating valves, the third regulating valves, the fourth regulating valves, the fifth regulating valves and the circulating pump are closed;

[0042] Start the air compressor and simultaneously open the terminal heat exchanger and its corresponding cooling water circulation system (heat is exchanged in the terminal heat exchanger to control the compressed air discharge temperature to be stable);

[0043] When the inlet air temperature of the terminal heat exchanger reaches 60° C., close the first regulating valve corresponding to the terminal heat exchanger, start the circulation pump, open the first regulating valve corresponding to the last intermediate heat exchanger in the first direction, and open the fifth regulating valve;

[0044] When the air intake temperature of the last intermediate heat exchanger in the first direction reaches the second preset temperature, the fifth regulating valve is closed, and the fourth regulating valve and the third regulating valve are opened; the first regulating valve corresponding to the last intermediate heat exchanger in the first direction is closed; the first regulating valve corresponding to the first intermediate heat exchanger in the first direction is opened, and the third regulating valve is opened;

[0045] When the air intake temperature of the first intermediate heat exchanger in the first direction reaches the third preset temperature, the first intermediate heat exchanger in the first direction is closed; the first regulating valve of the head-end heat exchanger is opened, the opening of the third regulating valve is gradually reduced, and the opening of the second regulating valve is gradually opened, and the openings of the third regulating valve and the second regulating valve are controlled until the difference between the outflow temperature of the heat exchange medium of the head-end heat exchanger and the exhaust temperature of the compressor is close to the design end difference of the heat exchanger, the third regulating valve is closed, the second regulating valve is fully opened, the air compressor is started, and the system enters a stable operation state.

[0046] In some embodiments provided by the present disclosure, the number of the intermediate heat exchangers is three or more, and the intermediate heat exchangers other than the intermediate heat exchanger at the head end of the first direction are all provided with corresponding fifth regulating valves, which are recorded as the nth intermediate heat exchanger and the fifth regulating valve n;

[0047] When the nth intermediate heat exchanger reaches the second preset temperature n corresponding to the nth intermediate heat exchanger, the fifth regulating valve n corresponding to the nth intermediate heat exchanger is closed, and the fifth regulating valve n-1 corresponding to the n-1th intermediate heat exchanger is opened.

[0048] In another aspect, a control device is provided in an embodiment of the present disclosure. The heat storage and exchange system described above comprises:

[0049] A first control module, used to obtain the start and stop status of the heat storage and exchange system;

[0050] A second control module is used to determine a corresponding target control strategy according to the start and stop conditions of the heat storage and exchange system, wherein the target control strategy includes: a first control strategy and a second control strategy, wherein the first control strategy is a multi-stage control of heat exchange of a heat exchanger group, and the second control strategy is a multi-stage control of heat exchange and air intake of the heat exchanger group;

[0051] The third control module is used to control the start and stop of the circulation pump and the switch status and switch degree of multiple regulating valves according to the target control strategy.

[0052] On the other hand, a control system is provided in an embodiment of the present disclosure, which includes a processor, a memory, and a computer program stored in the memory and executable on the processor, and the computer program implements the steps of the above-mentioned control method of the heat storage and exchange system when executed by the processor.

[0053] On the other hand, a computer-readable storage medium is provided in an embodiment of the present disclosure, wherein a computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, the steps of the control method of the heat storage and exchange system are implemented.

[0054] The heat storage and exchange system, control method, control device and control system provided by the embodiments of the present disclosure have at least the following beneficial effects:

[0055] The present invention provides multiple heat exchangers to perform multi-stage heat exchange on compressed air, so that the heat exchange temperature difference of each heat exchanger is small, reducing the thermal impact of the heat exchanger caused by the temperature difference, so that the heat exchanger has the ability to cope with the problem of large temperature difference alternation. At the same time, by providing a reflux cooling channel and controlling the flow of the heat exchange medium through a regulating valve, it is beneficial to improve the temperature compliance rate of the heat exchange medium entering the high-temperature tank during the heat exchange process. In addition, the multi-stage air intake of compressed air can be achieved through the first regulating valve, and the compressed air of different temperature sections discharged from the air compressor that is restarted after a short shutdown is matched with the heat exchangers and heat exchange media at different temperature ends, which is also beneficial to improve the temperature compliance rate of the heat exchange medium entering the high-temperature tank during the heat exchange process.

[0056] Other features and advantages of the present disclosure will be described in the following description, and partly become apparent from the description, or be understood by implementing the present disclosure. Other advantages of the present disclosure can be invented and obtained by the schemes described in the description. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] The accompanying drawings are used to provide an understanding of the technical solution of the present disclosure and constitute a part of the specification. Together with the embodiments of the present disclosure, they are used to explain the technical solution of the present disclosure and do not constitute a limitation on the technical solution of the present disclosure.

[0058] Figure 1 It is a schematic diagram of the structure of the heat storage and exchange system disclosed in the present invention.

[0059] Reference numerals:

[0060] 1. Air compressor; 2. Head-end heat exchanger; 3. Terminal heat exchanger; 401. The first intermediate heat exchanger in the first direction; 402. The last intermediate heat exchanger in the first direction; 5. Low-temperature tank; 6. High-temperature tank; 7. Circulation pump; 8. First regulating valve; 9. Second regulating valve; 10. Third regulating valve; 11. Fourth regulating valve; 12. Fifth regulating valve; 13. Air storage device; 14. Cooling water circulation system; 15. First one-way valve; 16. Second one-way valve. DETAILED DESCRIPTION

[0061] To make the purpose, technical solution and advantages of the present disclosure more clear, the embodiments of the present disclosure are described in detail below. It should be noted that the embodiments and features in the embodiments of the present disclosure can be combined with each other arbitrarily without conflict.

[0062] The heat storage and exchange system provided by the present invention performs multi-stage heat exchange on compressed air by setting up multiple heat exchangers, so that the heat exchange temperature difference of each heat exchanger is small, reducing the thermal impact of the heat exchanger caused by the temperature difference, so that the heat exchanger has the ability to cope with the problem of large temperature difference alternation. At the same time, by setting a reflux cooling channel and controlling the flow of the heat exchange medium through a regulating valve, it is beneficial to improve the temperature compliance rate of the heat exchange medium entering the high-temperature tank during the heat exchange process. In addition, multi-stage air intake of compressed air can be achieved through the first regulating valve, and the compressed air of different temperature sections discharged from the air compressor that is restarted after a short shutdown is matched with the heat exchangers and heat exchange media at different temperature ends, which is also beneficial to improve the temperature compliance rate of the heat exchange medium entering the high-temperature tank during the heat exchange process.

[0063] The preset time duration in the present disclosure is based on the temperature setting of a reference heat exchanger, preferably the time duration for the reference heat exchanger to drop from the design temperature to the reference temperature, wherein the reference temperature is preferably half of the design temperature.

[0064] The high temperature tank and the low temperature tank in the present disclosure are both used to store heat exchange medium, and the temperature of the heat exchange medium in the high temperature tank is higher than the temperature of the heat exchange medium in the low temperature tank. The heat storage condition of the high temperature tank is that the temperature is higher than a preset heat storage temperature, and the heat storage temperature is preferably different from the exhaust temperature of the air compressor during normal operation by a preset terminal difference.

[0065] like Figure 1 As shown, in the embodiment of the present disclosure, a heat storage and exchange system for compressed air energy storage is exemplarily provided, and the heat storage and exchange system includes: an air compressor 1, a heat exchanger group, a low temperature tank 5, a high temperature tank 6, a circulation pump 7, a first regulating valve 8 and a second regulating valve 9;

[0066] The heat exchanger group includes: a head end heat exchanger 2, a terminal heat exchanger 3 and an intermediate heat exchanger;

[0067] The head-end heat exchanger 2, the intermediate heat exchanger and the terminal heat exchanger 3 are connected in series between the air compressor 1 and the air storage device 13 through an air pipeline;

[0068] A first regulating valve 8 is provided on the air pipeline between the head-end heat exchanger 2 and the air compressor 1;

[0069] The air pipeline between the head-end heat exchanger 2 and the adjacent intermediate heat exchanger, the air pipeline between two adjacent intermediate heat exchangers, and the air pipeline between the terminal heat exchanger 3 and the adjacent intermediate heat exchanger are all provided with a first three-way connection; one of the interfaces of the first three-way connection is independently connected to the air compressor 1 through the air pipeline and the first regulating valve 8;

[0070] The head-end heat exchanger 2, the intermediate heat exchanger and the circulating pump 7 are connected in series between the inlet of the high-temperature tank 6 and the outlet of the low-temperature tank 5 through a cooling pipe;

[0071] A second regulating valve 9 and a second tee are provided on the cooling pipes of the head-end heat exchanger 2 and the adjacent intermediate heat exchanger, and one of the interfaces of the second tee is connected to the inlet of the low-temperature tank 5 through a pipe and a third regulating valve 10;

[0072] Exemplarily, the first end and the second end of the first tee are used for connecting adjacent heat exchangers in series, and the third end is independently connected to the air compressor 1 through an air pipeline and a first regulating valve 8 .

[0073] Exemplarily, the first and second ends of the second tee are used to connect to the cooling pipe between the head-end heat exchanger 2 and the intermediate heat exchanger, and the third end is connected to the inlet of the low-temperature tank 5 through the pipe and the third regulating valve.

[0074] Exemplarily, the cooling pipe of the terminal heat exchanger is connected to the cooling water circulation system, and the terminal heat exchanger exchanges heat independently.

[0075] For example, the number of the head-end heat exchangers may be one or more than two; the number of the intermediate heat exchangers may be one or more than two; the number of the terminal heat exchangers may be one or more than two; for example, Figure 1 As shown, the number of the head-end heat exchanger is one; the number of the intermediate heat exchangers is more than two; and the number of the terminal heat exchanger is one.

[0076] Exemplarily, the head-end heat exchanger is a heat exchanger in the series that is directly connected to the heat exchanger of the air compressor, and the terminal heat exchanger is a heat exchanger in the series that is directly connected to the air storage device.

[0077] For example, Figure 1 As shown, the heat storage and exchange system also includes:

[0078] The first one-way valve 15 is arranged on the air ducts of two adjacent heat exchangers; the two adjacent heat exchangers can be two different head-end heat exchangers, can be a head-end heat exchanger and an intermediate heat exchanger, can be two different intermediate heat exchangers, can be an intermediate heat exchanger and a terminal heat exchanger, and can be two different terminal heat exchangers.

[0079] The flow direction of the first one-way valve 15 is a first direction from the air compressor 1 to the air storage device 13 .

[0080] For example, Figure 1 As shown, the heat storage and exchange system also includes:

[0081] A second one-way valve 12 is provided on a cooling pipeline between the low-temperature tank 5 and the intermediate heat exchanger at the end along the first direction;

[0082] The flow direction of the second one-way valve 12 is a second direction from the low-temperature tank 5 to the high-temperature tank.

[0083] For example, Figure 1 As shown, the heat storage and exchange system also includes:

[0084] A fourth regulating valve 11 is arranged in the cooling pipe between two adjacent intermediate heat exchangers;

[0085] The fifth regulating valve 12 has one end connected to the outlet of the cooling pipe of the intermediate heat exchanger, and the other end connected to the inlet of the circulation pump 7. The fourth regulating valve can close the connection of the cooling medium of the two intermediate heat exchangers, but will not affect the circulation of the cooling medium through the fifth regulating valve and the circulation pump. The circulation pump 7 is arranged between the inlet of the cooling pipe of the last intermediate heat exchanger 402 in the first direction and the outlet of the low-temperature tank 5.

[0086] The heat exchangers disclosed in the present invention can be divided into two categories. One category is the head-end heat exchanger and the intermediate heat exchanger. This type of heat exchanger enables the cooling medium to exchange heat with the compressed air step by step, and is used to extract the heat in the compressed air and store it in a high-temperature storage tank. This type of heat exchanger can be set to a single stage or multiple stages; the second type of heat exchanger is the terminal heat exchanger, which can also be set to a single stage or multiple stages, and both further cool the compressed air through an external cooling water circulation system.

[0087] On the other hand, the present disclosure exemplarily provides a control method for a heat storage and exchange system, which can be used as described above. Figure 1 The heat storage and exchange system shown, the control method includes:

[0088] Obtaining the start and stop conditions of the air compressor 1, the circulation pump 7, the first regulating valve 8, the second regulating valve 9, the third regulating valve 10, the fourth regulating valve 11 and the fifth regulating valve 12 of the heat storage and exchange system at the current moment, and the switching degree of the first regulating valve 8, the second regulating valve 9, the third regulating valve 10, the fourth regulating valve 11 and the fifth regulating valve 12;

[0089] Determining a corresponding target control strategy according to the start and stop conditions of the heat storage and exchange system;

[0090] The target control strategy includes: a first control strategy and a second control strategy, wherein the first control strategy is to control the heat exchange of the heat exchanger group at multiple stages, and the second control strategy is to control the heat exchange and air intake of the heat exchanger group at multiple stages;

[0091] According to the target control strategy, the start and stop of the air compressor 1 and the circulation pump 7 and the switching states and switching degrees of the first regulating valve 8, the second regulating valve 9, the third regulating valve 10, the fourth regulating valve 11 and the fifth regulating valve 12 are controlled.

[0092] Exemplarily, according to the start and stop conditions of the heat storage and exchange system, determining a corresponding target control strategy includes:

[0093] When the start-stop situation is the first start or the start-stop interval is greater than a preset duration, determining that the target control strategy is the first control strategy;

[0094] When the start-stop interval is less than or equal to the preset duration, the target control strategy is determined to be the second control strategy.

[0095] Exemplarily, the first control strategy includes:

[0096] Only the first regulating valve 8 (RV1) corresponding to the head-end heat exchanger 2 is controlled to be fully opened to realize the flow of compressed air to the air storage device, and the other first regulating valves, the second regulating valve 9, the third regulating valve 10, the fourth regulating valve 11, the fifth regulating valve 12 and the circulation pump 7 are closed;

[0097] Start the air compressor 1 and the circulating pump 7, open the fifth regulating valve 12 at the same time, and open the terminal heat exchanger 3 and its corresponding cooling water circulation system 14 at the same time. At this time, heat is circulated and exchanged in the terminal heat exchanger 3 and the last intermediate heat exchanger 402 in the first direction; part of the heat exchange medium in the low-temperature tank can enter the last intermediate heat exchanger 402 in the first direction, and exchange heat with the compressed air to reduce the temperature of the compressed air, which is beneficial to improving the heat exchange efficiency of the terminal heat exchanger and the cooling water circulation system, and at the same time avoiding the heat exchange medium that does not meet the heat storage conditions of the high-temperature tank from entering the high-temperature tank, and by circulating heat exchange in the last intermediate heat exchanger 402 in the first direction without entering the cooling tank, it is beneficial to improve the efficiency of the last intermediate heat exchanger 402 in the first direction to reach the corresponding design temperature.

[0098] When the air intake temperature of the last intermediate heat exchanger in the first direction reaches the second preset temperature or the compressor exhaust temperature reaches the second preset temperature, the fifth regulating valve is closed, and the fourth regulating valve and the third regulating valve are opened. At this time, heat circulates in the two intermediate heat exchangers and the terminal heat exchanger 3 for heat exchange; heat exchange between the heat exchange medium and the compressed air is achieved through the two intermediate heat exchangers. At this time, the heat exchange medium is still not sent to the high-temperature tank, which is beneficial to avoid the heat exchange medium that does not meet the heat storage conditions of the high-temperature tank from entering the high-temperature tank.

[0099] Exemplarily, the second preset temperature may be 240°C.

[0100] When the air inlet temperature of the first intermediate heat exchanger in the first direction reaches the third preset temperature or the exhaust temperature of the air compressor 1 reaches the third preset temperature, the opening of the third regulating valve 10 is gradually reduced, and the opening of the second regulating valve 9 is gradually opened. The openings of the third regulating valve 10 and the second regulating valve 9 are controlled until the difference between the outflow temperature of the heat exchange medium of the head-end heat exchanger 2 and the exhaust temperature of the compressor is close to the design end difference of the heat exchanger. The third regulating valve 10 is closed, the second regulating valve 9 is fully opened, the air compressor 1 is started, and the system enters a stable operation state.

[0101] Exemplarily, the third preset temperature may be 420°C.

[0102] Illustratively, in the present disclosure, “close to,” “about,” “approximately,” or “approximately” refers to ±30%, ±20%, ±10%, or ±5% of the number.

[0103] For example, Figure 1 As shown, when the first control strategy is used, the heat storage system can be started for the first time or after a long-term shutdown, and the temperature of each heat exchanger is close to room temperature or lower than 1 / 2 of the designed operating temperature. The first control strategy is described in detail in the following embodiments:

[0104] During the startup of the air compressor 1, it takes some time for the exhaust temperature of the air compressor 1 to gradually rise from the ambient temperature to the designed exhaust temperature (for example, 600°C). Each heat exchanger is in a cold state, and the heat exchanger's own structure and the original heat exchange medium in the heat exchanger are at a low temperature level, with an initial startup heat capacity. If the normal operation stage is entered directly, that is, the first air channel and the first cooling channel are opened, and the compressed air is subjected to multi-stage heat exchange, the temperature of the heat exchange medium after heat exchange will not be able to reach the heat storage condition of the high-temperature tank 6 due to the low initial exhaust temperature. The first control strategy allows the heat exchange medium with a lower temperature to reflux instead of entering the high-temperature tank 6, which is beneficial to ensure the heat storage efficiency.

[0105] Before the air compressor 1 is started, the first regulating valve 8 (RV1) corresponding to the head-end heat exchanger is fully opened, and other valves are closed.

[0106] After the air compressor 1 is started, the compressed air enters the air storage device 13 (or the next compressor) through the first regulating valve 8 (RV1) corresponding to the head-end heat exchanger and the compressed air passage formed by the intermediate heat exchanger and the terminal heat exchanger in series. During the flow process, the compressed air exchanges heat with the low-temperature side fluid of each heat exchanger in turn.

[0107] When the air compressor 1 is started, the circulating water on the low-temperature side of the terminal heat exchanger 3 is started, and the compressed air discharge temperature is stabilized by regulating the circulating water flow. At the same time, the circulating pump 7 is started, the fifth regulating valve 12 is opened, and the low-temperature heat exchange medium in the low-temperature tank 5 is pumped to the low-temperature side of the last intermediate heat exchanger 402 in the first direction through the circulating pump 7, and after heat exchange with the compressed air on the high-temperature side, it is returned to the inlet of the circulating pump 7 through the heat exchange medium loop formed by the fifth regulating valve 12. Part of the heat exchange medium in the low-temperature tank can enter the intermediate heat exchanger and exchange heat with the compressed air to reduce the temperature of the compressed air, which is beneficial to improve the heat exchange efficiency of the terminal heat exchanger and the cooling water circulation system, and at the same time prevent the heat exchange medium that does not meet the heat storage conditions of the high-temperature tank from entering the high-temperature tank.

[0108] As the compression process proceeds, the exhaust temperature of the air compressor 1 gradually increases. When the intake temperature of the last intermediate heat exchanger 402 in the first direction reaches the second preset temperature (for example, 240°C), the fifth regulating valve 12 is closed, and the fourth regulating valve 11 and the third regulating valve 10 are opened at the same time. The heat exchange medium returns to the low-temperature tank 5 through the heat exchange medium loop formed by the first intermediate heat exchanger 401 in the first direction, the last intermediate heat exchanger 402 in the first direction and the third regulating valve 10. Since the volume of the heat exchange medium in the low-temperature tank 7 is relatively large, the short-term reflux of a small amount of medium and low-temperature heat exchange medium will not cause a significant change in the temperature in the low-temperature tank 7.

[0109] As the exhaust temperature of the air compressor 1 gradually increases, when the inlet temperature of the first intermediate heat exchanger in the first direction increases to the third preset temperature (420°C), the opening of the third regulating valve 10 is gradually closed, and the second regulating valve 9 is opened and gradually increases. By controlling the openings of the third regulating valve 10 and the second regulating valve 9, the difference between the outflow temperature of the heat exchange medium of the head-end heat exchanger 2 and the exhaust temperature of the air compressor is close to the design end difference of the heat exchanger, until the third regulating valve 10 is completely closed and the second regulating valve 9 is fully opened, the air compressor is started, and the system enters a stable operation state.

[0110] During the startup of the air compressor 1 of this embodiment, the compressed air can pass through each heat exchanger step by step and release heat, first satisfying the heat absorption required by the heat capacity of each heat exchanger itself, and starting the heat exchanger step by step from low temperature to high temperature through the exhaust temperature level, thereby avoiding the heat exchange medium from directly entering the high temperature tank when the compressed air temperature does not meet the standard. At the same time, by dividing the heat exchanger into 4 heat exchangers in series, the maximum temperature difference of each heat exchanger is controlled below 180°C, which greatly reduces the temperature rise gradient during the startup process and reduces the expansion of the heat exchange pipeline caused by the temperature rise, thereby eliminating the influence of frequent start-stop and alternating stress on the life of the heat exchanger.

[0111] In this embodiment, the first one-way valve 15 is provided to allow the compressed air to flow in a predetermined direction, and the second one-way valve 16 is provided to allow the heat exchange medium to flow in a predetermined direction.

[0112] Exemplarily, the second control strategy includes:

[0113] Only the first regulating valve 8 (RV4) corresponding to the terminal heat exchanger 3 is controlled to be fully opened, and the other first regulating valves, the second regulating valve 9, the third regulating valve 10, the fourth regulating valve 11, the fifth regulating valve 12 and the circulating pump 7 are closed;

[0114] The air compressor 1 is started, and the compressed air enters the air storage device through the first regulating valve 8 (RV4) corresponding to the terminal heat exchanger 3 and the terminal heat exchanger 3. At the same time, the terminal heat exchanger 3 and its corresponding cooling water circulation system 14 are opened, and heat is exchanged in the terminal heat exchanger 3, so that after the air compressor is started, the compressed air can be circulated to the air storage device through the heat exchange of the terminal heat exchanger, and the discharge temperature of the compressed air is controlled to be stable;

[0115] When the air inlet temperature of the terminal heat exchanger 3 reaches the first preset temperature or the exhaust temperature of the air compressor reaches the first preset temperature, the first regulating valve 8 (RV1) corresponding to the terminal heat exchanger 3 is closed, the circulation pump 7 is started, the first regulating valve 8 (RV3) corresponding to the last intermediate heat exchanger 402 in the first direction is opened, and the fifth regulating valve 12 is opened. At this time, heat is exchanged in the terminal heat exchanger 3 and the last intermediate heat exchanger 402 in the first direction;

[0116] Exemplarily, the first preset temperature in the second control strategy may be 60°C.

[0117] When the air intake temperature of the last intermediate heat exchanger 402 in the first direction reaches the second preset temperature or the exhaust temperature of the compressor reaches the second preset temperature, the fifth regulating valve is closed, and the fourth regulating valve and the third regulating valve are opened; the first regulating valve 8 (RV3) corresponding to the last intermediate heat exchanger in the first direction is closed; the first regulating valve 8 (RV2) corresponding to the first intermediate heat exchanger 401 in the first direction is opened, and the third regulating valve 10 is opened, and at this time, heat is circulated and exchanged in the two intermediate heat exchangers and the terminal heat exchanger 3;

[0118] Exemplarily, the second preset temperature in the second control strategy has the same value range as the second preset temperature in the first control strategy.

[0119] When the air inlet temperature of the first intermediate heat exchanger in the first direction reaches the third preset temperature or the exhaust temperature of the air compressor reaches the third preset temperature, close the regulating valve 8 (RV2) corresponding to the first intermediate heat exchanger in the first direction; open the first regulating valve 8 (RV1) of the head-end heat exchanger, gradually reduce the opening of the third regulating valve 10, gradually open the opening of the second regulating valve 9, control the opening of the third regulating valve 10 and the second regulating valve 9, until the difference between the outflow temperature of the heat exchange medium of the head-end heat exchanger 2 and the exhaust temperature of the air compressor 1 is close to the design end difference of the heat exchanger, close the third regulating valve 10, fully open the second regulating valve 9, the air compressor 1 is started, and the system enters a stable operation state.

[0120] Exemplarily, the third preset temperature in the second control strategy has the same value range as the third preset temperature in the first control strategy.

[0121] For example, Figure 1 As shown, when the second control strategy is used, the heat storage system can be restarted after a short shutdown. The temperature of each heat exchanger is close to the normal operating temperature or higher than 1 / 2 of the designed operating temperature, and the initial exhaust temperature of the air compressor 1 is low. If it directly enters the normal operating stage, the temperature of the heat exchange medium after heat exchange will not reach the heat storage condition of the high-temperature tank 6 due to the low initial exhaust temperature, and the temperature of the heat exchanger will be reduced. The second control strategy can reduce the heat exchange of compressed air and avoid the heat exchange medium directly entering the high-temperature tank 6, which is beneficial to ensure the heat storage efficiency. The second control strategy is detailed in the following embodiments:

[0122] During the startup of the air compressor 1, since it takes a while for the exhaust temperature of the air compressor 1 to gradually rise from the ambient temperature to the designed exhaust temperature (e.g. 600°C), each heat exchanger is in a steady state or hot state, the heat exchanger's own structure and the original heat exchange medium in the heat exchanger are at a medium-high temperature level, and the initial startup heat capacity is small.

[0123] Before the air compressor 1 is started, the first regulating valve 8 (RV4) corresponding to the terminal heat exchanger is fully opened, and other valves are closed.

[0124] After the air compressor 1 is started, the compressed air enters the air storage device 13 (or the next compressor) through the first regulating valve 8 (RV4) corresponding to the terminal heat exchanger and the terminal heat exchanger 3. During the flow, the compressed air exchanges heat with the low-temperature side fluid of the terminal heat exchanger.

[0125] When the air compressor 1 is started, the circulating water on the low temperature side of the terminal heat exchanger 3 is started, and the discharge temperature of the compressed air is stabilized by adjusting the circulating water flow rate.

[0126] When the air intake temperature of the terminal heat exchanger 3 or the exhaust temperature of the air compressor 1 reaches 60°C, the circulating pump 7 starts, and the first regulating valve 8 (RV3) and the fifth regulating valve 10 corresponding to the last intermediate heat exchanger 402 in the first direction open and close the first regulating valve 8 (RV4) corresponding to the terminal heat exchanger 3. The compressed air enters the subsequent process through the compressed air passage formed by the last intermediate heat exchanger 402 in the first direction and the terminal heat exchanger 3 in series. The low-temperature heat exchange medium in the low-temperature tank 5 is pumped to the low-temperature side of the last intermediate heat exchanger 402 in the first direction through the circulating pump 7, and after heat exchange with the compressed air on the high-temperature side, it returns to the inlet of the circulating pump 7 through the heat exchange medium loop formed by the fifth regulating valve 10.

[0127] As the compression process proceeds, the exhaust temperature of the air compressor 1 gradually increases. When the intake temperature of the last intermediate heat exchanger 402 in the first direction reaches the second preset temperature (for example, 240°C), the fifth regulating valve 12 is closed, and the fourth regulating valve 11 and the third regulating valve 10 are opened at the same time. The first regulating valve 8 (RV3) is closed, and the first regulating valve 8 (RV2) corresponding to the first intermediate heat exchanger 401 in the first direction is opened at the same time. The compressed air enters the subsequent process through the first intermediate heat exchanger 401 in the first direction, the last intermediate heat exchanger in the first direction, and the high-temperature side of the terminal heat exchanger 3 connected in series. The heat exchange medium returns to the low-temperature tank 5 through the heat exchange medium loop formed by the first intermediate heat exchanger 401 in the first direction, the low-temperature side of the last intermediate heat exchanger 402 in the first direction and the fifth regulating valve 12. Since the volume of the heat exchange medium in the low-temperature tank 5 is large, the short-term reflux of a small amount of medium and low-temperature heat exchange medium will not cause a significant change in the temperature in the low-temperature tank 5.

[0128] As the compression process proceeds, the exhaust temperature of the air compressor 1 gradually increases. When the inlet temperature of the first intermediate heat exchanger in the first direction increases to the third preset temperature (420°C), the first regulating valve 8 (RV2) is closed, and the first regulating valve 8 (RV1) is opened at the same time. The opening of the third regulating valve 10 is gradually reduced, and the second regulating valve 9 is opened and gradually increased. By controlling the openings of the third regulating valve 10 and the second regulating valve 9, the difference between the outflow temperature of the heat exchange medium of the head-end heat exchanger 2 and the exhaust temperature of the air compressor 1 is made close to the design end difference of the heat exchanger, until the third regulating valve 10 is completely closed and the second regulating valve 9 is fully opened, the air compressor 1 is started, and the system enters a stable operation state.

[0129] During the startup of the air compressor 1 of this embodiment, the heat exchanger is started step by step from low temperature to high temperature by adjusting the exhaust temperature level from low temperature to high temperature, which prevents the heat exchange medium from directly entering the high temperature tank when the compressed air temperature does not meet the standard, and also prevents the low temperature air from flowing through the high temperature heat exchanger, causing the temperature of the heat exchanger and the original heat exchange medium to decrease. At the same time, by dividing the heat exchanger into 4 heat exchangers in series, the maximum temperature difference of each heat exchanger is controlled below 180°C, which greatly reduces the temperature rise gradient during the startup process and reduces the expansion of the heat exchange pipeline caused by temperature rise, thereby eliminating the influence of frequent start-stop and alternating stress on the life of the heat exchanger.

[0130] In this embodiment, the first one-way valve 15 is provided to allow the compressed air to flow in a predetermined direction, and the second one-way valve 16 is provided to allow the heat exchange medium to flow in a predetermined direction.

[0131] Exemplarily, the number of the intermediate heat exchangers may be more than three, and each intermediate heat exchanger except the intermediate heat exchanger at the head end in the first direction may be provided with a corresponding fifth regulating valve, which is recorded as the nth intermediate heat exchanger and the fifth regulating valve n;

[0132] When controlling the intermediate heat exchanger: when the nth intermediate heat exchanger reaches the second preset temperature n corresponding to the nth intermediate heat exchanger (the number of second preset temperatures n is not greater than the sum of the number of intermediate heat exchangers other than the head end), close the fifth regulating valve n corresponding to the nth intermediate heat exchanger, and open the fifth regulating valve n-1 corresponding to the n-1th intermediate heat exchanger (i.e., the adjacent intermediate heat exchanger upstream along the first direction) (heat circulates and exchanges heat in the nth intermediate heat exchanger and the n-1th intermediate heat exchanger through a circulating pump) (open the nth intermediate heat exchanger in sequence so that heat circulates and exchanges heat in multiple nth intermediate heat exchangers through a circulating pump until the intake air temperature of the 1st intermediate heat exchanger reaches the third preset temperature).

[0133] In another aspect, a control device is provided in an embodiment of the present disclosure. The heat storage and exchange system described above comprises:

[0134] A first control module, used to obtain the start and stop status of the heat storage and exchange system;

[0135] A second control module is used to determine a corresponding target control strategy according to the start and stop conditions of the heat storage and exchange system, wherein the target control strategy includes: a first control strategy and a second control strategy, wherein the first control strategy is a multi-stage control of heat exchange of a heat exchanger group, and the second control strategy is a multi-stage control of heat exchange and air intake of the heat exchanger group;

[0136] The third control module is used to control the start and stop of the circulation pump and the switch status and switch degree of multiple regulating valves according to the target control strategy.

[0137] On the other hand, a control system is provided in an embodiment of the present disclosure, which includes a processor, a memory, and a computer program stored in the memory and executable on the processor, and the computer program implements the steps of the above-mentioned control method of the heat storage and exchange system when executed by the processor.

[0138] On the other hand, a computer-readable storage medium is provided in an embodiment of the present disclosure, wherein a computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, the steps of the control method of the heat storage and exchange system are implemented.

Claims

1. A heat storage and exchange system for compressed air energy storage, characterized in that: The heat storage and exchange system comprises: an air compressor, a heat exchanger group, a low temperature tank, a high temperature tank, a circulation pump, a first regulating valve and a second regulating valve; The heat exchanger group includes: a head end heat exchanger, a terminal heat exchanger and an intermediate heat exchanger; The head-end heat exchanger, the intermediate heat exchanger and the terminal heat exchanger are connected in series between the air compressor and the air storage device through an air pipeline; A first regulating valve is provided on the air pipeline between the head-end heat exchanger and the air compressor; A first tee is provided on the air pipeline between the head-end heat exchanger and the adjacent intermediate heat exchanger, on the air pipeline between two adjacent intermediate heat exchangers when there are more than two intermediate heat exchangers, and on the air pipeline between the terminal heat exchanger and the adjacent intermediate heat exchanger; one of the interfaces of the first tee is independently connected to the air compressor through the air pipeline and the first regulating valve; The head-end heat exchanger, the intermediate heat exchanger and the circulating pump are connected in series between the inlet of the high-temperature tank and the outlet of the low-temperature tank through a cooling pipeline; A second regulating valve and a second tee are provided on the cooling pipes of the head-end heat exchanger and the adjacent intermediate heat exchanger, and one interface of the second tee is connected to the inlet of the low-temperature tank through a pipe and a third regulating valve.

2. The heat storage and exchange system according to claim 1, characterized in that: The heat storage and exchange system further comprises: A first one-way valve, wherein the first one-way valve is arranged on air ducts of two adjacent heat exchangers; The flow direction of the first one-way valve is a first direction from the air compressor to the air storage device.

3. The heat storage and exchange system according to claim 2, characterized in that: The heat storage and exchange system further comprises: A second one-way valve is provided on a cooling pipeline between the low-temperature tank and the intermediate heat exchanger at the end along the first direction; The flow direction of the second one-way valve is a second direction from the low-temperature tank to the high-temperature tank.

4. The heat storage and exchange system according to any one of claims 1 to 3, characterized in that: The heat storage and exchange system further comprises: A fourth regulating valve is arranged in a cooling pipe between two adjacent intermediate heat exchangers; A fifth regulating valve has one end connected to the outlet of the cooling pipe of the intermediate heat exchanger and the other end connected to the inlet of the circulating pump.

5. A method for controlling a heat storage and exchange system, using the heat storage and exchange system according to claim 4, characterized in that: The control method comprises: Acquire the start / stop conditions of the air compressor, the circulation pump, the first regulating valve, the second regulating valve, the third regulating valve, the fourth regulating valve and the fifth regulating valve of the heat storage and exchange system at the current moment, and the switch degrees of the first regulating valve, the second regulating valve, the third regulating valve, the fourth regulating valve and the fifth regulating valve; Determining a corresponding target control strategy according to the start and stop conditions of the heat storage and exchange system; The target control strategy includes: a first control strategy and a second control strategy, wherein the first control strategy is to control the heat exchange of the heat exchanger group at multiple stages, and the second control strategy is to control the heat exchange and air intake of the heat exchanger group at multiple stages; According to the target control strategy, the start and stop of the air compressor and the circulation pump and the switching states and switching degrees of the first regulating valve, the second regulating valve, the third regulating valve, the fourth regulating valve and the fifth regulating valve are controlled.

6. The control method according to claim 5, characterized in that: According to the start and stop conditions of the heat storage and exchange system, a corresponding target control strategy is determined, including: When the start-stop situation is the first start or the start-stop interval is greater than a preset duration, determining that the target control strategy is the first control strategy; When the start-stop interval is less than or equal to the preset duration, the target control strategy is determined to be the second control strategy.

7. The control method according to claim 6, characterized in that: The first control strategy includes: Only the first regulating valve corresponding to the head-end heat exchanger is controlled to be fully opened, and the other first regulating valves, the second regulating valves, the third regulating valves, the fourth regulating valves, the fifth regulating valves and the circulating pump are closed; Starting the air compressor and the circulation pump, and simultaneously opening the fifth regulating valve, and simultaneously opening the terminal heat exchanger and its corresponding cooling water circulation system; When the inlet air temperature of the last intermediate heat exchanger in the first direction reaches the second preset temperature, the fifth regulating valve is closed, and the fourth regulating valve and the third regulating valve are opened; When the air inlet temperature of the first intermediate heat exchanger in the first direction reaches the third preset temperature, the opening of the third regulating valve is gradually reduced, and the opening of the second regulating valve is gradually opened, and the openings of the third regulating valve and the second regulating valve are controlled until the difference between the outflow temperature of the heat exchange medium of the head-end heat exchanger and the exhaust temperature of the compressor is close to the design end difference of the heat exchanger, the third regulating valve is closed, the second regulating valve is fully opened, the air compressor is started, and the system enters a stable operation state.

8. The control method according to claim 6, characterized in that: The second control strategy includes: Only the first regulating valve corresponding to the terminal heat exchanger is controlled to be fully opened, and the other first regulating valves, the second regulating valves, the third regulating valves, the fourth regulating valves, the fifth regulating valves and the circulating pump are closed; Starting the air compressor and simultaneously opening the terminal heat exchanger and its corresponding cooling water circulation system; When the air inlet temperature of the terminal heat exchanger reaches the first preset temperature or the exhaust temperature of the air compressor reaches the first preset temperature, the first regulating valve corresponding to the terminal heat exchanger is closed, the circulation pump is started, the first regulating valve corresponding to the last intermediate heat exchanger in the first direction is opened, and the fifth regulating valve is opened; When the air intake temperature of the last intermediate heat exchanger in the first direction reaches the second preset temperature or the exhaust temperature of the compressor reaches the second preset temperature, the fifth regulating valve is closed, and the fourth regulating valve and the third regulating valve are opened; the first regulating valve corresponding to the last intermediate heat exchanger in the first direction is closed; the first regulating valve corresponding to the first intermediate heat exchanger in the first direction is opened, and the third regulating valve is opened; When the air inlet temperature of the first intermediate heat exchanger in the first direction reaches the third preset temperature or the exhaust temperature of the air compressor reaches the third preset temperature, close the first intermediate heat exchanger in the first direction; open the first regulating valve of the head-end heat exchanger, gradually reduce the opening of the third regulating valve, gradually open the opening of the second regulating valve, control the openings of the third regulating valve and the second regulating valve, until the difference between the outflow temperature of the heat exchange medium of the head-end heat exchanger and the exhaust temperature of the compressor is close to the design end difference of the heat exchanger, close the third regulating valve, fully open the second regulating valve, the air compressor is started, and the system enters a stable operation state.

9. The control method according to claim 7 or 8, characterized in that: The number of the intermediate heat exchangers is more than three, and the intermediate heat exchangers other than the intermediate heat exchanger at the head end of the first direction are all provided with corresponding fifth regulating valves, which are recorded as the nth intermediate heat exchanger and the fifth regulating valve n; When the nth intermediate heat exchanger reaches the second preset temperature n corresponding to the nth intermediate heat exchanger, the fifth regulating valve n corresponding to the nth intermediate heat exchanger is closed, and the fifth regulating valve n-1 corresponding to the n-1th intermediate heat exchanger is opened.

10. A control device, applied to the heat storage and exchange system according to any one of claims 1 to 4, characterized in that: The control device comprises: A first control module, used to obtain the start and stop status of the heat storage and exchange system; A second control module is used to determine a corresponding target control strategy according to the start and stop conditions of the heat storage and exchange system, wherein the target control strategy includes: a first control strategy and a second control strategy, wherein the first control strategy is a multi-stage control of heat exchange of a heat exchanger group, and the second control strategy is a multi-stage control of heat exchange and air intake of the heat exchanger group; The third control module is used to control the start and stop of the circulation pump and the switch status and switch degree of multiple regulating valves according to the target control strategy.

11. A control system, characterized in that: The control system includes a processor, a memory, and a computer program stored in the memory and executable on the processor. When the computer program is executed by the processor, the steps of the control method of the heat storage and exchange system as described in any one of claims 5 to 9 are implemented.

12. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the control method of the heat storage and exchange system according to any one of claims 5 to 9 are implemented.

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