Compressed air energy storage device and control method

Abstract

The present application provides a compressed air energy storage heat storage device and a control method, wherein the compressed air energy storage heat storage device includes: a first pipeline, the first end of which is connected to the pipeline after the outlet heat exchanger of the second stage compressor of the compressed air energy storage, and is used to send the dry pressure gas sent out by the outlet heat exchanger of the second stage compressor into the gap between the double tank bodies of the double-layer heat storage spherical tank as a pressure-bearing gas source; a second pipeline, which is used to send the nitrogen produced by the nitrogen production system as a pressure-stabilizing gas source into the inner cavity of the double-layer heat storage spherical tank; a third pipeline is connected between the second end of the first pipeline and the second end of the second pipeline, and the third pipeline is used to send the nitrogen produced by the nitrogen production system as a pressure-bearing gas source into the gap between the double tank bodies of the double-layer heat storage spherical tank when the compressor of the compressed air energy storage is stopped. The above scheme achieves the purpose of simple and efficient air energy heat storage, and reduces the implementation cost while meeting the high pressure requirements.

Description

Technical Field

[0001] The present application belongs to the field of clean energy technology, and in particular relates to a compressed air energy and heat storage device and a control method. Background Art

[0002] The development of renewable and clean energy is a development trend in the energy field. Energy storage technology can smooth the output fluctuations of wind and solar power sources, improve and connect to the grid, and is a major component of power system construction. The demand for large-scale and long-term energy storage technology is particularly strong.

[0003] Compressed air energy storage is an important form of energy storage. It is another technology suitable for large-scale power energy storage besides pumped storage. Compressed air energy storage not only has the advantages of high energy storage, but also has the advantages of high energy density, high power density, low operating cost, and long service life. Compressed air energy storage technology mainly includes: traditional compressed air energy storage, adiabatic compressed air energy storage, isothermal compressed air energy storage, liquid compressed air energy storage, etc.

[0004] Taking the storage of electrical energy as an example, the compressed air energy storage system can be mainly divided into two basic working processes: energy storage and energy release. When storing energy, the electric motor drives the air compressor to absorb air from the environment, compress it to a high-pressure state and store it in the air storage reservoir. In this process, electrical energy is converted into the internal energy of the compressed air; when releasing energy, the compressed air stored in the air storage device enters the air turbine to expand and generate electricity, and the internal energy and potential energy contained in the compressed air are converted back into electrical energy.

[0005] However, in current engineering applications, medium-temperature thermal storage spherical tanks using water as the thermal storage medium all use single-layer steel structures, and the common materials are carbon steel or alloy steel. Limited by the physical properties of the thermal storage medium and the manufacturing level of large-capacity single-layer steel structure pressure spherical tanks, the maximum thermal storage temperature in actual engineering applications can only be around 220°C.

[0006] There is currently no effective solution to improve the performance of compressed air energy storage and heat storage devices and reduce production costs. Summary of the invention

[0007] The purpose of this application is to provide a compressed air energy storage and heat storage device and a control method, which can improve the performance of the compressed air energy storage and heat storage device and reduce production costs.

[0008] The present application provides a compressed air energy storage and heat storage device, comprising: a first pipeline, a double-layer heat storage spherical tank, a nitrogen production system, and a second pipeline, wherein:

[0009] The first pipeline has a first end connected to a pipeline behind the outlet heat exchanger of the second stage compressor of the compressed air energy storage, and a second end connected to the gap between the double-layer tank bodies of the double-layer heat storage spherical tank, and is used to deliver the dry pressurized gas delivered by the outlet heat exchanger of the second stage compressor into the gap between the double-layer tank bodies of the double-layer heat storage spherical tank as a pressurized gas source;

[0010] The second pipeline has a first end connected to the outlet of the nitrogen production system and a second end connected to the inner cavity of the double-layer thermal storage spherical tank, and is used to deliver the nitrogen produced by the nitrogen production system as a pressure-stabilizing gas source into the inner cavity of the double-layer thermal storage spherical tank;

[0011] A third pipeline is connected between the second end of the first pipeline and the second end of the second pipeline. The third pipeline is used to deliver the nitrogen produced by the nitrogen production system as a pressurized gas source into the gap between the double-layer tank bodies of the double-layer heat storage spherical tank when the compressor of the compressed air energy storage is shut down.

[0012] In one embodiment, the first pipeline is provided with: a first electric gate valve, a first check valve, a second electric gate valve, a first electric regulating valve, and a third electric gate valve in sequence; wherein the first electric gate valve is used to control the on-off of the inlet direction of the first pipeline, the first check valve is used to prevent the gas in the first pipeline from flowing back to the compressor, the second electric gate valve is used to control the on-off of the outlet direction of the first pipeline, the first electric regulating valve is used to adjust the gas supply pressure of the first pipeline, and the third electric gate valve is used to cut off the first electric regulating valve when the first electric regulating valve is overhauled;

[0013] The second pipeline is provided with: a second check valve, a fourth electric gate valve, a second electric regulating valve, and a fifth electric gate valve in sequence; wherein the second check valve is used to prevent the nitrogen in the second pipeline from flowing back, the fourth electric gate valve is used to control the on-off of the outlet direction of the second pipeline, the second electric regulating valve is used to adjust the pressure of the nitrogen supply of the second pipeline, and the fifth electric gate valve is used to cut off the second electric regulating valve when the second electric regulating valve is overhauled;

[0014] The third pipeline is provided with a third check valve and a sixth electric gate valve in sequence; wherein the third check valve is used to prevent gas reflux from causing air to enter the inner cavity of the double-layer heat storage spherical tank and cause corrosion of the inner cavity, and the sixth electric gate valve is used to control the on-off of the connectivity between the first pipeline and the second pipeline.

[0015] In one embodiment, the compressed air energy storage device further includes: a first pressure monitor, a second pressure monitor, a first safety valve, and a second safety valve, wherein the first safety valve is connected to the third electric gate valve, and the second safety valve is connected to the fifth electric gate valve, wherein:

[0016] The first pressure monitor is used to monitor the air pressure of the gap between the double-layer tank bodies of the double-layer thermal storage spherical tank as the real-time gap pressure value, and when the real-time gap pressure value is greater than the upper limit of the gap pressure, control the first safety valve to open to release pressure to the air;

[0017] The second pressure monitor is used to monitor the air pressure in the inner cavity of the double-layer heat storage spherical tank as the real-time pressure value in the cavity. When the real-time pressure value in the cavity is greater than the upper limit value of the pressure in the cavity, the second safety valve is controlled to open to release pressure to the air.

[0018] In one embodiment, the compressed air energy storage device further includes: a first pressure monitor and a second pressure monitor, wherein:

[0019] The first pressure monitor is used to monitor the air pressure of the gap between the double-layer tank bodies of the double-layer thermal storage spherical tank as the real-time gap pressure value, and when the real-time gap pressure value is less than the lower limit of the gap pressure, the monitored real-time gap pressure value is sent to the distributed control system to control the valve in the first pipeline and replenish air in the gap between the double-layer tank bodies of the double-layer thermal storage spherical tank;

[0020] The second pressure monitor is used to monitor the air pressure in the inner cavity of the double-layer heat storage spherical tank as the real-time pressure value in the cavity. When the real-time pressure value in the cavity is less than the lower limit value of the pressure in the cavity, the monitored real-time pressure value in the cavity is sent to the distributed control system to control the valve in the second pipeline and replenish air in the inner cavity of the double-layer heat storage spherical tank.

[0021] In one embodiment, the inner cavity of the double-layer heat storage spherical tank stores high-pressure saturated water and nitrogen, the double-layer tank bodies of the double-layer heat storage spherical tank are filled with pressurized dry air and / or nitrogen, support connectors are evenly arranged between the double-layer tank bodies of the double-layer heat storage spherical tank, and the outer wall of the outer tank body of the double-layer heat storage spherical tank is installed with a support base and a thermal insulation layer.

[0022] A control method based on the compressed air energy storage and heat storage device comprises:

[0023] Determine the stage of compressed air energy storage as the target stage;

[0024] The control strategy corresponding to the target stage is called up to control the valves in the first pipeline and the valves in the second pipeline in the compressed air energy storage device to realize the gas injection control of the gap between the double-layer tank bodies of the double-layer heat storage spherical tank and the inner cavity of the double-layer heat storage spherical tank.

[0025] In one embodiment, the compressed air energy storage stages include: a compression energy storage stage, a shutdown energy storage stage, an expansion energy release stage, and a shutdown stage after energy release.

[0026] In one embodiment, the control strategy corresponding to the target stage is called to control the valve in the first pipeline and the valve in the second pipeline in the compressed air energy storage device to achieve gas injection control of the gap between the double-layer tank bodies of the double-layer thermal storage spherical tank and the inner cavity of the double-layer thermal storage spherical tank, including:

[0027] In the case where the target stage is the compression energy storage stage, after the air compressor is started, the first electric gate valve, the first check valve, the second electric gate valve, the first electric regulating valve and the third electric gate valve are controlled to be opened, so that the dry pressurized gas sent out of the outlet heat exchanger of the second stage compressor of the compressed air energy storage flows through the first electric gate valve, the first check valve, the second electric gate valve, the first electric regulating valve, the third electric gate valve and the first safety valve in sequence as a pressurized gas source and is sent into the gap between the double-layer tank bodies of the double-layer heat storage spherical tank;

[0028] The air pressure of the gap between the double-layer tank bodies of the double-layer thermal storage spherical tank is monitored by a first pressure monitor as a real-time gap pressure value. When the real-time gap pressure value reaches a gap full air threshold, the real-time gap pressure value is sent to a distributed control system, and the first electric gate valve, the second electric gate valve and the third electric gate valve are closed in linkage through the distributed control system;

[0029] The air pressure of the gap between the double-layer tank bodies of the double-layer heat storage spherical tank is continuously monitored by the first pressure monitor as the real-time gap pressure value. When the real-time gap pressure value is less than the lower limit of the gap pressure, the real-time gap pressure value is sent to the distributed control system, and the first electric gate valve, the second electric gate valve and the third electric gate valve are opened through the distributed control system to inject air into the gap between the double-layer tank bodies of the double-layer heat storage spherical tank. When the real-time gap pressure value is greater than the upper limit of the gap pressure, the first safety valve is automatically opened to deflate the gap between the double-layer tank bodies of the double-layer heat storage spherical tank, so as to maintain the air pressure of the gap between the double-layer tank bodies of the double-layer heat storage spherical tank between the lower limit of the gap pressure and the upper limit of the gap pressure, wherein the gap full air threshold is greater than the lower limit of the gap pressure and less than the upper limit of the gap pressure.

[0030] In one embodiment, when the target stage is the compression energy storage stage, after the air compressor is started, the method further includes:

[0031] Start the nitrogen generation system, and the nitrogen generated by the nitrogen generation system flows sequentially through the second check valve, the fourth electric gate valve, the second electric regulating valve, the fifth electric gate valve and the second safety valve into the inner cavity of the double-layer heat storage spherical tank;

[0032] The air pressure in the inner cavity of the double-layer heat storage spherical tank is monitored by a second pressure monitor as a real-time pressure value in the cavity. When the real-time pressure value in the cavity reaches a full-gas threshold in the cavity, the real-time pressure value in the cavity is sent to the distributed control system, and the fourth electric gate valve and the fifth electric gate valve are closed in linkage through the distributed control system;

[0033] The air pressure of the inner cavity of the double-layer heat storage spherical tank is continuously monitored as the real-time pressure value in the cavity by the second pressure monitor. When the real-time pressure value in the cavity is less than the lower limit value of the pressure in the cavity, the real-time pressure value in the cavity is sent to the distributed control system, and the fourth electric gate valve and the fifth electric gate valve are opened through the distributed control system to inject air into the inner cavity of the double-layer heat storage spherical tank. When the real-time pressure value in the cavity is greater than the upper limit value of the pressure in the cavity, the second safety valve is automatically opened to deflate the inner cavity of the double-layer heat storage spherical tank to maintain the air pressure in the inner cavity of the double-layer heat storage spherical tank between the lower limit value of the pressure in the cavity and the upper limit value of the pressure in the cavity, wherein the full air threshold value in the cavity is greater than the lower limit value of the pressure in the cavity and less than the upper limit value of the pressure in the cavity.

[0034] In one embodiment, the control strategy corresponding to the target stage is called to control the valve in the first pipeline and the valve in the second pipeline in the compressed air energy storage device to achieve gas injection control of the gap between the double-layer tank bodies of the double-layer thermal storage spherical tank and the inner cavity of the double-layer thermal storage spherical tank, including:

[0035] When the target stage is the shutdown energy storage stage, the air compressor is in a shutdown state or a standby state, and the first electric gate valve, the first check valve, the second electric gate valve, the first electric regulating valve, the third electric gate valve and the first safety valve are in a closed state;

[0036] The air pressure of the gap between the double-layer tank bodies of the double-layer heat storage spherical tank is continuously monitored by the first pressure monitor. When the real-time gap pressure value is less than the lower limit of the gap pressure, the real-time gap pressure value is sent to the distributed control system, and the fourth electric gate valve, the fifth electric gate valve and the sixth electric gate valve are opened in linkage with the distributed control system to inject gas into the gap between the double-layer tank bodies of the double-layer heat storage spherical tank through the nitrogen generated by the nitrogen production system; when the real-time gap pressure value is greater than the upper limit of the gap pressure, the first safety valve is automatically opened to deflate the gap between the double-layer tank bodies of the double-layer heat storage spherical tank, so as to maintain the air pressure of the gap between the double-layer tank bodies of the double-layer heat storage spherical tank between the lower limit of the gap pressure and the upper limit of the gap pressure;

[0037] The air pressure in the inner cavity of the double-layer heat storage spherical tank is continuously monitored as the real-time pressure value in the cavity by the second pressure monitor. When the real-time pressure value in the cavity is less than the lower limit value of the pressure in the cavity, the real-time pressure value in the cavity is sent to the distributed control system, and the fourth electric gate valve and the fifth electric gate valve are opened in linkage with the distributed control system to inject gas into the inner cavity of the double-layer heat storage spherical tank with nitrogen generated by the nitrogen production system; when the real-time pressure value in the cavity is greater than the upper limit value of the pressure in the cavity, the second safety valve is automatically opened to deflate the inner cavity of the double-layer heat storage spherical tank to maintain the air pressure in the inner cavity of the double-layer heat storage spherical tank between the lower limit value of the pressure in the cavity and the upper limit value of the pressure in the cavity.

[0038] In one embodiment, the control strategy corresponding to the target stage is called to control the valve in the first pipeline and the valve in the second pipeline in the compressed air energy storage device to achieve gas injection control of the gap between the double-layer tank bodies of the double-layer thermal storage spherical tank and the inner cavity of the double-layer thermal storage spherical tank, including:

[0039] When the target stage is the expansion energy release stage or the shutdown stage after energy release, the air compressor is in a shutdown state or a standby state, and the first electric gate valve, the first check valve, the second electric gate valve, the first electric regulating valve, the third electric gate valve and the first safety valve are controlled to be in a closed state;

[0040] The second check valve, the fourth electric gate valve, the second electric regulating valve, the fifth electric gate valve and the second safety valve are controlled to be in a closed state.

[0041] The compressed air energy storage heat storage device and control method provided in the present application are provided with a first pipeline, a double-layer heat storage spherical tank, a nitrogen making system, and a second pipeline. The first end of the first pipeline is connected to the pipeline after the outlet heat exchanger of the second-stage compressor of the compressed air energy storage, and the second end is connected to the gap between the double-layer tank bodies of the double-layer heat storage spherical tank, and is used to send the dry pressurized gas sent out by the outlet heat exchanger of the second-stage compressor into the gap between the double-layer tank bodies of the double-layer heat storage spherical tank as a pressure-bearing gas source; the first end of the second pipeline is connected to the outlet of the nitrogen making system, and the second end is connected to the inner cavity of the double-layer heat storage spherical tank, and is used to send the nitrogen produced by the nitrogen making system as a pressure-stabilizing gas source into the inner cavity of the double-layer heat storage spherical tank; a third pipeline is connected between the second end of the first pipeline and the second end of the second pipeline, and the third pipeline is used to send the nitrogen produced by the nitrogen making system as a pressure-bearing gas source into the gap between the double-layer tank bodies of the double-layer heat storage spherical tank when the compressor of the compressed air energy storage is stopped. The above scheme solves the problem of low bearing pressure of the existing single-layer heat storage spherical tank. By setting the first pipeline, the gas of the compressor can be used to fill the gap between the double layers of the double-layer heat storage spherical tank. By setting the third pipeline, nitrogen can be used for filling when the compressor is not working, which effectively saves energy consumption, achieves the purpose of simple and efficient air energy heat storage, and reduces the implementation cost while meeting the high pressure demand. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0043] Figure 1 This is a schematic diagram of the architecture of an embodiment of a high-efficiency heat storage device and control system for a compressed air energy storage power station provided by the present application;

[0044] Figure 2 It is a structural schematic diagram of the compressed air energy storage and heat storage device provided in this application;

[0045] Figure 3 It is a method flow chart of an embodiment of a control method based on a compressed air energy storage and heat storage device provided by the present application;

[0046] Figure 4 It is a hardware structure block diagram of an electronic device based on a control method of a compressed air energy storage and heat storage device provided in the present application;

[0047] Figure 5It is a schematic diagram of the module structure of an embodiment of a control device based on a compressed air energy storage and heat storage device provided in the present application. DETAILED DESCRIPTION

[0048] In order to enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of this application.

[0049] Adiabatic compressed air energy storage can minimize heat exchange between the air compressor and the environment and reduce heat dissipation by taking good thermal insulation measures, so as to be as close to the adiabatic compression process as possible. At the same time, by increasing the single-stage compression ratio of the air compressor, higher temperature compressed air and higher grade compression heat energy can be obtained, and the pressure potential energy and compression heat energy can be decoupled and stored. During the energy release process, the stored compression heat energy can be used to heat the air turbine inlet air, realizing non-supplementary compressed air energy storage without the need for additional fuel.

[0050] According to the different heat storage temperatures, adiabatic compressed air energy storage has three different technical routes: high temperature, medium-high temperature, and medium temperature. Among them, the exhaust temperature of the compressor of the high-temperature adiabatic compressed air energy storage system can reach above 600°C, which can improve the energy storage efficiency of the system. However, the sealing structure and lubrication structure inside the high-temperature air compressor currently have major technical bottlenecks, and the solid packed bed is prone to temperature gradients and uneven heat exchange. Therefore, the current high-temperature adiabatic compressed air energy storage system is difficult to achieve engineering application. The heat storage temperature of the medium-high temperature adiabatic compressed air energy storage system is generally around 300°C. The commonly used heat storage medium is thermal oil or molten salt. The equipment technology is mature, the cost is reasonable, and it is easy to apply in engineering. The heat storage temperature of the medium-temperature adiabatic compressed air energy storage system is generally around 200°C, and the heat storage medium is water. The key equipment technology is mature, the cost is reasonable, and it is easy to apply in engineering. The medium-temperature route has a low initial investment and a simple and mature process solution, so it is widely used.

[0051] For example, the medium-temperature non-supplementary adiabatic compressed air energy storage technology route can be adopted in the system, and the heat storage system uses the double tank method to realize the storage process of thermal energy. The low-temperature heat medium water circulation pump pumps the cold water in the low-temperature spherical tank into the air compression side air-water heat exchanger, absorbs the compression heat of the first three stages of the air compressor, and stores the hot water after heat absorption and heating in the high-temperature and high-pressure spherical tank to complete the heat storage process; during the air expansion process, the high-temperature heat medium water circulation pump pumps the hot water in the high-temperature and high-pressure spherical tank into the air expansion side air-water heat exchanger, releases heat to heat the compressed air, increases the inlet air temperature of the expander, and stores the low-temperature water after heat release and cooling in the low-temperature spherical tank to complete the heat release process. From the working principle of the adiabatic compressed air energy storage system, it can be seen that the heat storage temperature affects the intake temperature of the expansion process. According to the theory of classical thermodynamics, the intake temperature of the expander is positively correlated with the expansion power output of the unit. Therefore, the increase in the system heat storage temperature will increase the output power of the expansion process, thereby improving the overall energy efficiency of the system.

[0052] For compressed air energy storage systems, the subsystems that have a greater impact on efficiency are mainly the air compression subsystem, gas storage subsystem, heat storage and exchange subsystem, and expansion and power generation subsystem. Among them, the efficiency of the air compression subsystem and the expansion and power generation subsystem is mainly limited by the working principle and manufacturing capacity of the air compressor and air turbine, and the room for improvement is relatively limited; large-scale compressed air energy storage power stations all use underground gas storage (salt caverns, artificial chambers, etc.) for gas storage. The efficiency of the gas storage subsystem is greatly affected by external conditions. The heat storage and exchange subsystem will directly affect the conversion efficiency of thermal energy in energy conversion, and the impact on the overall efficiency of the system is relatively obvious.

[0053] At present, the medium-temperature route heat storage spherical tank with water as the heat storage medium in the heat storage and exchange subsystem adopts a single-layer steel structure heat storage spherical tube. Limited by the physical properties of the heat storage medium and the manufacturing level of large-capacity single-layer steel structure pressure spherical tanks, the current maximum heat storage temperature in actual engineering applications is about 220°C. Through the water thermodynamic parameter table, it can be found that the saturated pressure corresponding to 220°C saturated water is 2.32MPa.a, and the corresponding saturated pressure increases with the temperature. According to the relevant specifications of pressure vessels, if the pressure needs to be increased, the wall thickness of the heat storage spherical tank needs to be increased. However, due to the influence of multiple factors such as manufacturing and processing capabilities, material stress fatigue, welding process requirements, and manufacturing costs, the heat storage temperature in actual applications is within 230°C.

[0054] In this example, a compressed air energy storage heat storage device and a control method are provided, in which the outlet gas of the air compressor is used as the pressurized gas source of the heat storage device, and the valve operation is implemented through the DCS (Distributed Control System) to achieve integrated centralized control at the plant level, thereby achieving the purpose of safe and stable operation, and can greatly increase the heat storage temperature, improve the system efficiency and the economy of the power station.

[0055] Specifically, in this example, a high-efficiency heat storage device and control system for a compressed air energy storage power station are provided, such as Figure 1 As shown, it may include: an air compression subsystem (pressure air source), a heat storage spherical tank 7, an electric gate valve 1, a check valve 2, an electric gate valve 3, an electric regulating valve 4, an electric gate valve 5, a safety valve 6, a nitrogen making system 8, a check valve 9, an electric gate valve 10, an electric regulating valve 11, an electric gate valve 12, a safety valve 13, a check valve 14, an electric gate valve 15, a pressure monitoring device 16 and a pressure monitoring device 17, and a number of pipelines.

[0056] Among them, the heat storage spherical tank 7 is the main body of the heat storage device; the electric gate valve 1 is used to open and close the compressed air main plant; the check valve 2 is used to prevent the gas backflow from affecting the operation of the compression system; the electric gate valve 3 is used to open and close the heat storage spherical tank; the electric regulating valve 4 is used to adjust the gas supply pressure; the electric gate valve 5 is used for valve adjustment, maintenance and cut-off. In normal operation, the electric gate valve 5 is normally open; the safety valve 6 is used to prevent gas overpressure and release pressure to the air when overpressure occurs; the nitrogen making system 8 is used to provide a stable pressure gas source for the inner cavity of the heat storage spherical tank; the check valve 9 is used to prevent the stable pressure nitrogen from flowing back; the electric gate valve Valve 10 is used to close, open and shut down the heat storage spherical tank nearby; electric regulating valve 11 is used to adjust the nitrogen supply pressure; electric gate valve 12 is used to adjust the valve for maintenance and shut off, and the electric gate valve 12 is normally open under normal operating conditions; safety valve 13 is used to prevent gas overpressure and release pressure to the air when overpressure occurs; check valve 14 is used to prevent gas reflux from causing air to enter the inner cavity of the heat storage spherical tank and aggravate the corrosion of the inner cavity of the spherical tank; electric gate valve 15 is used to open and close the connecting pipe between the nitrogen pipeline and the air pipeline; pressure monitoring device 16 is used to monitor the pressure between the double-layer tank bodies and feed back the detected pressure signal to DCS.

[0057] In one embodiment, the heat storage spherical tank 7 is a double-layer structured pressurized heat storage spherical tank. The inner tank body cavity of the heat storage spherical tank 7 stores high-pressure saturated water and pressure-stabilized nitrogen. The outer tank body wall is installed with a support base and an insulation layer. Pressurized dry air or nitrogen is filled between the double-layer tank bodies. Support connectors are evenly distributed between the two layers. The support connectors evenly share the loads of the outer spherical tank, the insulation layer, the pipeline valve load, wind load, snow load, and other loads.

[0058] Taking a 300MW compressed air energy storage power station as an example, an air supply pipeline is added to the pipeline after the outlet heat exchanger of the second-stage air compressor. The air supply pipeline is equipped with an electric gate valve 1, a check valve 2, an electric gate valve 3, an electric regulating valve 4, an electric gate valve 5, and a safety valve 6 in sequence to inject pressurized air into the gap between the double-layer tanks.

[0059] Taking a storage cycle of a compressed air energy storage power station as an example, it is divided into a compressed energy storage stage, a shutdown energy storage stage, an expansion energy release stage, and a shutdown stage after energy release. These stages are described as follows:

[0060] 1) Compression energy storage stage:

[0061] After the air compressor is started, open the electric gate valve 1, electric gate valve 3, electric regulating valve 4, and electric gate valve 5. The outlet pressure of the second-stage compressor of the air compressor is 2.6MPa.g. After part of the air is heated and dried by the heat exchanger, it flows through the electric gate valve 1, check valve 2, electric gate valve 3, electric regulating valve 4, electric gate valve 5, and safety valve 6 in sequence and is injected into the gap between the double-layer tank bodies. The outlet pressure of the electric regulating valve 4 is set to 2.3MPa.g, and the pipeline resistance after the electric regulating valve 4 is temporarily set to 0.1MPa. When the pressure monitoring device 16 monitors that the air pressure between the double-layer tank bodies of the heat storage spherical tank reaches the first rated pressure value (that is, the gap full gas threshold, for example: 2.2MPa.g), the pressure signal is fed back to the DCS system, and the electric gate valve 1, electric gate valve 3, and electric gate valve 5 are closed in conjunction to complete the gas injection process.

[0062] Furthermore, the pressure signal of the pressure monitoring device 16 is continuously collected. When the pressure is lower than the lower limit of the gap pressure, the electric gate valve 1, the electric gate valve 3, and the electric gate valve 5 are opened through the DCS system to supplement the pressure; when the pressure is higher than the upper limit of the gap pressure, the safety valve 6 automatically opens to release pressure to the air and maintains the pressure at the rated pressure value. Among them, the gap full gas threshold is greater than the lower limit of the gap pressure and less than the upper limit of the gap pressure. For example, the gap full gas threshold is 2.2MPa.g, the lower limit of the gap pressure is 2MPa.g, and the upper limit of the gap pressure is 2.3MPa.g. However, it is worth noting that the gap full gas threshold, the lower limit of the gap pressure, and the upper limit of the gap pressure given in this example are only an exemplary description. In actual implementation, the numerical value can be selected as needed.

[0063] At the same time, the nitrogen filling process of the inner cavity of the heat storage spherical tank is carried out synchronously, the nitrogen making system 8 is started, and the nitrogen at the outlet of the nitrogen making system 8 flows through the check valve 9, the electric gate valve 10, the electric regulating valve 11, the electric gate valve 12, and the safety valve 13, and is injected into the inner cavity of the heat storage spherical tank. The outlet pressure of the electric regulating valve 11 is set to 4.7MPa.g, and the pipeline resistance after the electric regulating valve 11 is temporarily set to 0.1MPa. The pressure monitoring device 17 monitors the inner cavity pressure of the heat storage spherical tank to reach the second rated pressure value (that is, the full gas threshold in the cavity, for example: 2.4MPa.g, that is, the gap full gas threshold plus the full gas threshold in the cavity is equal to 4.6MPa.g), and the pressure signal is fed back to the DCS system, and the electric gate valve 10 and the electric gate valve 12 are closed in linkage to complete the nitrogen injection process.

[0064] During implementation, the cavity full gas threshold is slightly higher than the void full gas threshold (for example: the cavity full gas threshold is 2.4MPa.g, and the void full gas threshold is 2.2MPa.g). This is mainly because the diameter of the inner spherical tank is slightly smaller than the diameter of the outer spherical tank. Slightly increasing the inner cavity pressure can make the wall thickness of the outer and inner spherical tanks close or even the same, which is beneficial to the procurement and processing of raw materials.

[0065] Furthermore, the pressure signal of the pressure monitoring device 17 is continuously collected. When the pressure is lower than the lower limit of the cavity pressure, the electric gate valve 10 and the electric gate valve 12 are opened through the DCS system to supplement the pressure. When the pressure is higher than the upper limit of the cavity pressure, the safety valve 13 is automatically opened to release pressure to the air to maintain the pressure between the lower limit of the cavity pressure and the upper limit of the cavity pressure.

[0066] Based on the saturated water thermodynamic parameter table, it can be seen that the saturated temperature corresponding to saturated water of 4.7MPa.a is about 260°C. Therefore, through the method of this example, a heat storage temperature of 260°C can be achieved.

[0067] In this case, taking the 300MW compressed air energy storage project as an example, when the heat storage temperature is 260℃, the inner tank body of the double-layer pressure-bearing spherical tank has a pressure bearing capacity greater than 2.3MPa.g, a thickness of a1mm, and the outer tank body has a pressure bearing capacity greater than 2.2MPa.g, a thickness of a2mm. If a single-layer spherical tank body is used, the pressure bearing capacity needs to be greater than 4.6MPa.g, and the thickness is a3. a3 is significantly greater than a1+a2, and when the thickness is a3, the uneven heating of the spherical tank will be more obvious. The heating uniformity of the spherical tank with a thickness of a1 or a2 is significantly better than that of the single-layer spherical tank with a thickness of a3, and the manufacturing difficulty is relatively low. Therefore, the heat storage temperature can be effectively increased through the method of this example, and the implementation cost can be reduced while ensuring that the spherical tank is heated evenly.

[0068] 2) Shutdown energy storage stage:

[0069] During the shutdown energy storage stage, the air compressor is in shutdown or standby state, and the electric gate valve 1, the check valve 2, the electric gate valve 3, the electric regulating valve 4, the electric gate valve 5, and the safety valve 6 are in closed state.

[0070] The pressure signal of the pressure monitoring device 16 is continuously collected. When the pressure is lower than the lower limit of the void pressure, the electric gate valves 10, 12 and 15 are opened through the DCS system to inject nitrogen to supplement the pressure. When the pressure is higher than the upper limit of the void pressure, the safety valve 13 is automatically opened to release pressure to the air to maintain the pressure between the lower limit of the void pressure and the upper limit of the void pressure.

[0071] The pressure signal of the pressure monitoring device 17 is continuously collected. When the pressure is lower than the lower limit of the cavity pressure, the electric gate valve 10 and the electric gate valve 12 are opened through the DCS system to inject nitrogen to supplement the pressure; when the pressure is higher than the upper limit of the cavity pressure, the safety valve 13 is automatically opened to release pressure to the air to maintain the pressure between the lower limit of the cavity pressure and the upper limit of the cavity pressure.

[0072] That is, during the shutdown energy storage stage, the air pressure between the double-layer tank body of the thermal storage spherical tank and the pressure in the inner cavity of the thermal storage spherical tank are maintained by the nitrogen production system. This can ensure that when the compressor is shut down, the air pressure between the thermal storage spherical tank and the double-layer tank body can also be kept stable.

[0073] 3) Expansion energy release stage and shutdown stage after energy release:

[0074] The pressure signals of the pressure monitoring device 16 and the pressure monitoring device 17 are continuously collected, the air compressor is in shutdown or standby state, and the pipeline electric gate valve 1, check valve 2, electric gate valve 3, electric regulating valve 4, electric gate valve 5, and safety valve 6 are in closed state. The saturated pressure decreases as the temperature of the high-pressure hot water storage water decreases, and the pipeline check valve 9, electric gate valve 10, electric regulating valve 11, electric gate valve 12, and safety valve 13 are in closed state.

[0075] In the above example, a high-efficiency heat storage device suitable for a compressed air energy storage power station is provided. The heat storage device adopts a double-layer tank structure, which increases the upper pressure limit of the device. Furthermore, the compression system of the compressed air energy storage and the heat storage system are coupled and utilized. The dry hot air at the outlet of the second compressor is used as the pressure-bearing air source for the gap between the double-layer tanks of the heat storage spherical tank. This can effectively avoid corrosion problems and improve the thermal insulation performance, making the compressed air energy system more reasonable, simple to arrange and easy to operate. Furthermore, the method for controlling the pressure between the double-layer tanks is connected to the nitrogen pressure stabilization system. Nitrogen can be used as a supplementary working fluid between the double-layer tanks. The pressure signal is connected to the power station DCS system to realize centralized control and regulation of the power station. It also increases the upper limit of heat storage when compressed air energy storage uses water as the medium, improves the operating efficiency of the energy storage power station, and better plays the advantages of low investment cost and simple system of water heat storage.

[0076] In this example, a compressed air energy storage device is provided, such as Figure 2 As shown, it may include: a first pipeline 201, a double-layer heat storage spherical tank 202, a nitrogen production system 203, and a second pipeline 204, wherein:

[0077] The first pipeline 201 has a first end connected to the pipeline after the outlet heat exchanger 206 of the second stage compressor of the compressed air energy storage, and a second end connected to the gap between the double-layer tank bodies of the double-layer heat storage spherical tank, and is used to send the dry pressurized gas sent out by the outlet heat exchanger of the second stage compressor into the gap between the double-layer tank bodies of the double-layer heat storage spherical tank as a pressurized gas source;

[0078] The second pipeline 204 has a first end connected to the outlet of the nitrogen production system and a second end connected to the inner cavity of the double-layer thermal storage spherical tank, and is used to deliver the nitrogen produced by the nitrogen production system as a pressure-stabilizing gas source into the inner cavity of the double-layer thermal storage spherical tank;

[0079] A third pipeline 205 is connected between the second end of the first pipeline 201 and the second end of the second pipeline 204. The third pipeline is used to deliver the nitrogen produced by the nitrogen production system as a pressurized gas source into the gap between the double-layer tank bodies of the double-layer thermal storage spherical tank when the compressor of the compressed air energy storage is shut down.

[0080] In order to achieve effective control of the pipelines, various valves are set on the first pipeline, the second pipeline and the third pipeline to match and meet the control requirements. Specifically:

[0081] 1) The first pipeline may be provided with: a first electric gate valve, a first check valve, a second electric gate valve, a first electric regulating valve, and a third electric gate valve in sequence; wherein the first electric gate valve is used to control the on-off of the inlet direction of the first pipeline, the first check valve is used to prevent the gas in the first pipeline from flowing back to the compressor, the second electric gate valve is used to control the on-off of the outlet direction of the first pipeline, the first electric regulating valve is used to adjust the gas supply pressure of the first pipeline, and the third electric gate valve is used to cut off the first electric regulating valve when the first electric regulating valve is overhauled;

[0082] 2) The second pipeline may be provided with: a second check valve, a fourth electric gate valve, a second electric regulating valve, and a fifth electric gate valve in sequence; wherein the second check valve is used to prevent the nitrogen in the second pipeline from flowing back, the fourth electric gate valve is used to control the on-off of the outlet direction of the second pipeline, the second electric regulating valve is used to adjust the pressure of the nitrogen supply of the second pipeline, and the fifth electric gate valve is used to cut off the second electric regulating valve when it is under maintenance;

[0083] 3) A third check valve and a sixth electric gate valve may be sequentially arranged on the third pipeline; wherein the third check valve is used to prevent gas reflux from causing air to enter the inner cavity of the double-layer heat storage spherical tank and cause corrosion of the inner cavity, and the sixth electric gate valve is used to control the on-off of the connectivity between the first pipeline and the second pipeline.

[0084] Considering that the compressed air energy storage device has a need for gas injection, gas injection involves the question of whether the pressure exceeds or is sufficient. For this purpose, a pressure gauge and a safety valve can be set to monitor the pressure, and when the pressure is too high, the gas is released. For this purpose, the compressed air energy storage device can also include: a first pressure monitor, a second pressure monitor, a first safety valve, and a second safety valve, wherein the first safety valve is connected to the third electric gate valve, and the second safety valve is connected to the fifth electric gate valve; wherein the first pressure monitor is used to monitor the air pressure of the gap between the double-layer tank bodies of the double-layer heat storage spherical tank as the real-time pressure value of the gap, and when the real-time pressure value of the gap is greater than the upper limit value of the gap pressure, the first safety valve is controlled to open to release the pressure to the air; the second pressure monitor is used to monitor the air pressure of the inner cavity of the double-layer heat storage spherical tank as the real-time pressure value in the cavity, and when the real-time pressure value in the cavity is greater than the upper limit value of the cavity pressure, the second safety valve is controlled to open to release the pressure to the air.

[0085] Considering that the compressed air energy storage and heat storage device has a need for gas injection, gas injection involves the question of whether the pressure exceeds or is sufficient. For this reason, a pressure gauge can be set to monitor the pressure and perform gas injection when the pressure is insufficient. For this reason, the compressed air energy storage and heat storage device can also include: a first pressure monitor, which is used to monitor the air pressure of the gap between the double-layer tank bodies of the double-layer heat storage spherical tank as the real-time pressure value of the gap. When the real-time pressure value of the gap is less than the lower limit of the gap pressure, the monitored real-time pressure value of the gap is sent to the distributed control system to control the valve in the first pipeline and replenish the air between the double-layer tank bodies of the double-layer heat storage spherical tank; a second pressure monitor, which is used to monitor the air pressure of the inner cavity of the double-layer heat storage spherical tank as the real-time pressure value in the cavity. When the real-time pressure value in the cavity is less than the lower limit of the pressure in the cavity, the monitored real-time pressure value in the cavity is sent to the distributed control system to control the valve in the second pipeline and replenish the air in the inner cavity of the double-layer heat storage spherical tank.

[0086] The inner cavity of the double-layer heat storage spherical tank stores high-pressure saturated water and nitrogen, the double-layer tank bodies of the double-layer heat storage spherical tank are filled with pressurized dry air and / or nitrogen, and supporting connectors can be evenly arranged between the double-layer tank bodies of the double-layer heat storage spherical tank. The outer wall of the outer tank body of the double-layer heat storage spherical tank can be installed with a supporting base and a thermal insulation layer.

[0087] Based on the above compressed air energy storage and heat storage device, a control method is provided. Figure 3It is a method flow chart of an embodiment of the control method provided by the present application. Although the present application provides method operation steps or device structures as shown in the following embodiments or drawings, more or fewer operation steps or module units may be included in the method or device based on routine or no creative labor. In the steps or structures where there is no necessary causal relationship logically, the execution order of these steps or the module structure of the device is not limited to the execution order or module structure described in the embodiments of the present application and shown in the drawings. When the method or module structure is applied to an actual device or terminal product, it can be connected according to the method or module structure shown in the embodiment or drawings for sequential execution or parallel execution (for example, a parallel processor or a multi-threaded processing environment, or even a distributed processing environment).

[0088] Specifically, Figure 3 As shown, the above control method may include the following steps:

[0089] Step 301: Determine a compressed air energy storage stage as a target stage;

[0090] Step 302: Retrieve the control strategy corresponding to the target stage, and control the valve in the first pipeline and the valve in the second pipeline in the compressed air energy storage device to achieve air injection control of the gap between the double-layer tank bodies of the double-layer heat storage spherical tank and the inner cavity of the double-layer heat storage spherical tank.

[0091] The above-mentioned compressed air energy storage stages may include: a compression energy storage stage, a shutdown energy storage stage, an expansion energy release stage, and a shutdown stage after energy release. Specifically, for different stages, control may be performed in the following manner:

[0092] 1) When the target stage is the compression energy storage stage, after the air compressor is started, the first electric gate valve, the first check valve, the second electric gate valve, the first electric regulating valve and the third electric gate valve are controlled to be opened, so that the dry pressurized gas sent out by the outlet heat exchanger of the second stage compressor of the compressed air energy storage flows through the first electric gate valve, the first check valve, the second electric gate valve, the first electric regulating valve, the third electric gate valve and the first safety valve in sequence as a pressurized gas source and is sent into the gap between the double-layer tank bodies of the double-layer heat storage spherical tank;

[0093] The air pressure of the gap between the double-layer tank bodies of the double-layer thermal storage spherical tank is monitored by a first pressure monitor as a real-time gap pressure value. When the real-time gap pressure value reaches a gap full air threshold, the real-time gap pressure value is sent to a distributed control system, and the first electric gate valve, the second electric gate valve and the third electric gate valve are closed in linkage through the distributed control system;

[0094] The air pressure of the gap between the double-layer tank bodies of the double-layer heat storage spherical tank is continuously monitored by the first pressure monitor as the real-time gap pressure value. When the real-time gap pressure value is less than the lower limit of the gap pressure, the real-time gap pressure value is sent to the distributed control system, and the first electric gate valve, the second electric gate valve and the third electric gate valve are opened through the distributed control system to inject air into the gap between the double-layer tank bodies of the double-layer heat storage spherical tank. When the real-time gap pressure value is greater than the upper limit of the gap pressure, the first safety valve is automatically opened to deflate the gap between the double-layer tank bodies of the double-layer heat storage spherical tank, so as to maintain the air pressure of the gap between the double-layer tank bodies of the double-layer heat storage spherical tank between the lower limit of the gap pressure and the upper limit of the gap pressure, wherein the gap full air threshold is greater than the lower limit of the gap pressure and less than the upper limit of the gap pressure.

[0095] Furthermore, when the target stage is the compression energy storage stage, after the air compressor is started, the following steps may also be included:

[0096] Start the nitrogen generation system, and the nitrogen generated by the nitrogen generation system flows sequentially through the second check valve, the fourth electric gate valve, the second electric regulating valve, the fifth electric gate valve and the second safety valve into the inner cavity of the double-layer heat storage spherical tank;

[0097] The air pressure in the inner cavity of the double-layer heat storage spherical tank is monitored by a second pressure monitor as a real-time pressure value in the cavity. When the real-time pressure value in the cavity reaches a full-gas threshold in the cavity, the real-time pressure value in the cavity is sent to the distributed control system, and the fourth electric gate valve and the fifth electric gate valve are closed in linkage through the distributed control system;

[0098] The air pressure of the inner cavity of the double-layer heat storage spherical tank is continuously monitored as the real-time pressure value in the cavity by the second pressure monitor. When the real-time pressure value in the cavity is less than the lower limit value of the pressure in the cavity, the real-time pressure value in the cavity is sent to the distributed control system, and the fourth electric gate valve and the fifth electric gate valve are opened through the distributed control system to inject air into the inner cavity of the double-layer heat storage spherical tank. When the real-time pressure value in the cavity is greater than the upper limit value of the pressure in the cavity, the second safety valve is automatically opened to deflate the inner cavity of the double-layer heat storage spherical tank to maintain the air pressure in the inner cavity of the double-layer heat storage spherical tank between the lower limit value of the pressure in the cavity and the upper limit value of the pressure in the cavity, wherein the full air threshold value in the cavity is greater than the lower limit value of the pressure in the cavity and less than the upper limit value of the pressure in the cavity.

[0099] 2) When the target stage is the shutdown energy storage stage, the air compressor is in a shutdown state or a standby state, and the first electric gate valve, the first check valve, the second electric gate valve, the first electric regulating valve, the third electric gate valve and the first safety valve are in a closed state;

[0100] The air pressure of the gap between the double-layer tank bodies of the double-layer heat storage spherical tank is continuously monitored by the first pressure monitor. When the real-time gap pressure value is less than the lower limit of the gap pressure, the real-time gap pressure value is sent to the distributed control system, and the fourth electric gate valve, the fifth electric gate valve and the sixth electric gate valve are opened in linkage with the distributed control system to inject gas into the gap between the double-layer tank bodies of the double-layer heat storage spherical tank through the nitrogen generated by the nitrogen production system; when the real-time gap pressure value is greater than the upper limit of the gap pressure, the first safety valve is automatically opened to deflate the gap between the double-layer tank bodies of the double-layer heat storage spherical tank, so as to maintain the air pressure of the gap between the double-layer tank bodies of the double-layer heat storage spherical tank between the lower limit of the gap pressure and the upper limit of the gap pressure;

[0101] The air pressure in the inner cavity of the double-layer heat storage spherical tank is continuously monitored as the real-time pressure value in the cavity by the second pressure monitor. When the real-time pressure value in the cavity is less than the lower limit value of the pressure in the cavity, the real-time pressure value in the cavity is sent to the distributed control system, and the fourth electric gate valve and the fifth electric gate valve are opened in linkage with the distributed control system to inject gas into the inner cavity of the double-layer heat storage spherical tank with nitrogen generated by the nitrogen production system; when the real-time pressure value in the cavity is greater than the upper limit value of the pressure in the cavity, the second safety valve is automatically opened to deflate the inner cavity of the double-layer heat storage spherical tank to maintain the air pressure in the inner cavity of the double-layer heat storage spherical tank between the lower limit value of the pressure in the cavity and the upper limit value of the pressure in the cavity.

[0102] 3) When the target stage is the expansion energy release stage or the shutdown stage after energy release, the air compressor is in a shutdown state or a standby state, and the first electric gate valve, the first check valve, the second electric gate valve, the first electric regulating valve, the third electric gate valve and the first safety valve are controlled to be in a closed state; the second check valve, the fourth electric gate valve, the second electric regulating valve, the fifth electric gate valve and the second safety valve are controlled to be in a closed state.

[0103] The method embodiments provided in the above embodiments of the present application can be executed in a mobile terminal, a computer terminal or a similar computing device. Taking running on an electronic device as an example, Figure 4 is a hardware structure block diagram of an electronic device of a control method provided by this application. Figure 4 As shown, the electronic device 10 may include one or more (only one is shown in the figure) processors 02 (the processor 02 may include but is not limited to a processing device such as a microprocessor MCU or a programmable logic device FPGA), a memory 04 for storing data, and a transmission module 06 for communication functions. It can be understood by those skilled in the art that Figure 4 The structure shown is only for illustration and does not limit the structure of the above electronic device. Figure 4More or fewer components as shown, or with Figure 4 Different configurations are shown.

[0104] The memory 04 can be used to store software programs and modules of application software, such as program instructions / modules corresponding to the control method in the embodiment of the present application. The processor 02 executes various functional applications and data processing by running the software programs and modules stored in the memory 04, that is, the control method of the above-mentioned application is realized. The memory 04 may include a high-speed random access memory, and may also include a non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some examples, the memory 04 may further include a memory remotely arranged relative to the processor 02, and these remote memories may be connected to the electronic device 10 via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0105] The transmission module 06 is used to receive or send data via a network. The specific example of the above network may include a wireless network provided by a communication provider of the electronic device 10. In one example, the transmission module 06 includes a network adapter (Network Interface Controller, NIC), which can be connected to other network devices through a base station so as to communicate with the Internet. In one example, the transmission module 06 can be a radio frequency (Radio Frequency, RF) module, which is used to communicate with the Internet wirelessly.

[0106] At the software level, the above control device can be Figure 5 As shown, including:

[0107] A determination module 501 is used to determine a compressed air energy storage stage as a target stage;

[0108] The control module 502 is used to call the control strategy corresponding to the target stage, and control the valve in the first pipeline and the valve in the second pipeline in the compressed air energy storage heat storage device to realize the gas injection control of the gap between the double-layer tank bodies of the double-layer heat storage spherical tank and the inner cavity of the double-layer heat storage spherical tank.

[0109] In one embodiment, the compressed air energy storage stages may include: a compression energy storage stage, a shutdown energy storage stage, an expansion energy release stage, and a shutdown stage after energy release.

[0110] In one embodiment, the control strategy corresponding to the target stage is called to control the valve in the first pipeline and the valve in the second pipeline in the compressed air energy storage device to achieve the air injection control of the gap between the double-layer tank bodies of the double-layer thermal storage spherical tank and the inner cavity of the double-layer thermal storage spherical tank, which may include:

[0111] In the case where the target stage is the compression energy storage stage, after the air compressor is started, the first electric gate valve, the first check valve, the second electric gate valve, the first electric regulating valve and the third electric gate valve are controlled to be opened, so that the dry pressurized gas sent out of the outlet heat exchanger of the second stage compressor of the compressed air energy storage flows through the first electric gate valve, the first check valve, the second electric gate valve, the first electric regulating valve, the third electric gate valve and the first safety valve in sequence as a pressurized gas source and is sent into the gap between the double-layer tank bodies of the double-layer heat storage spherical tank;

[0112] The air pressure of the gap between the double-layer tank bodies of the double-layer thermal storage spherical tank is monitored by a first pressure monitor as a real-time gap pressure value. When the real-time gap pressure value reaches a gap full air threshold, the real-time gap pressure value is sent to a distributed control system, and the first electric gate valve, the second electric gate valve and the third electric gate valve are closed in linkage through the distributed control system;

[0113] The air pressure of the gap between the double-layer tank bodies of the double-layer heat storage spherical tank is continuously monitored by the first pressure monitor as the real-time gap pressure value. When the real-time gap pressure value is less than the lower limit of the gap pressure, the real-time gap pressure value is sent to the distributed control system, and the first electric gate valve, the second electric gate valve and the third electric gate valve are opened through the distributed control system to inject air into the gap between the double-layer tank bodies of the double-layer heat storage spherical tank. When the real-time gap pressure value is greater than the upper limit of the gap pressure, the first safety valve is automatically opened to deflate the gap between the double-layer tank bodies of the double-layer heat storage spherical tank, so as to maintain the air pressure of the gap between the double-layer tank bodies of the double-layer heat storage spherical tank between the lower limit of the gap pressure and the upper limit of the gap pressure, wherein the gap full air threshold is greater than the lower limit of the gap pressure and less than the upper limit of the gap pressure.

[0114] In one embodiment, when the target stage is the compression energy storage stage, after the air compressor is started, the following steps may also be included:

[0115] Start the nitrogen generation system, and the nitrogen generated by the nitrogen generation system flows sequentially through the second check valve, the fourth electric gate valve, the second electric regulating valve, the fifth electric gate valve and the second safety valve into the inner cavity of the double-layer heat storage spherical tank;

[0116] The air pressure in the inner cavity of the double-layer heat storage spherical tank is monitored by a second pressure monitor as a real-time pressure value in the cavity. When the real-time pressure value in the cavity reaches a full-gas threshold in the cavity, the real-time pressure value in the cavity is sent to the distributed control system, and the fourth electric gate valve and the fifth electric gate valve are closed in linkage through the distributed control system;

[0117] The air pressure of the inner cavity of the double-layer heat storage spherical tank is continuously monitored as the real-time pressure value in the cavity by the second pressure monitor. When the real-time pressure value in the cavity is less than the lower limit value of the pressure in the cavity, the real-time pressure value in the cavity is sent to the distributed control system, and the fourth electric gate valve and the fifth electric gate valve are opened through the distributed control system to inject air into the inner cavity of the double-layer heat storage spherical tank. When the real-time pressure value in the cavity is greater than the upper limit value of the pressure in the cavity, the second safety valve is automatically opened to deflate the inner cavity of the double-layer heat storage spherical tank to maintain the air pressure in the inner cavity of the double-layer heat storage spherical tank between the lower limit value of the pressure in the cavity and the upper limit value of the pressure in the cavity, wherein the full air threshold value in the cavity is greater than the lower limit value of the pressure in the cavity and less than the upper limit value of the pressure in the cavity.

[0118] In one embodiment, the control strategy corresponding to the target stage is called to control the valve in the first pipeline and the valve in the second pipeline in the compressed air energy storage device to achieve the air injection control of the gap between the double-layer tank bodies of the double-layer thermal storage spherical tank and the inner cavity of the double-layer thermal storage spherical tank, which may include:

[0119] When the target stage is the shutdown energy storage stage, the air compressor is in a shutdown state or a standby state, and the first electric gate valve, the first check valve, the second electric gate valve, the first electric regulating valve, the third electric gate valve and the first safety valve are in a closed state;

[0120] The air pressure of the gap between the double-layer tank bodies of the double-layer heat storage spherical tank is continuously monitored by the first pressure monitor. When the real-time gap pressure value is less than the lower limit of the gap pressure, the real-time gap pressure value is sent to the distributed control system, and the fourth electric gate valve, the fifth electric gate valve and the sixth electric gate valve are opened in linkage with the distributed control system to inject gas into the gap between the double-layer tank bodies of the double-layer heat storage spherical tank through the nitrogen generated by the nitrogen production system; when the real-time gap pressure value is greater than the upper limit of the gap pressure, the first safety valve is automatically opened to deflate the gap between the double-layer tank bodies of the double-layer heat storage spherical tank, so as to maintain the air pressure of the gap between the double-layer tank bodies of the double-layer heat storage spherical tank between the lower limit of the gap pressure and the upper limit of the gap pressure;

[0121] The air pressure in the inner cavity of the double-layer heat storage spherical tank is continuously monitored as the real-time pressure value in the cavity by the second pressure monitor. When the real-time pressure value in the cavity is less than the lower limit value of the pressure in the cavity, the real-time pressure value in the cavity is sent to the distributed control system, and the fourth electric gate valve and the fifth electric gate valve are opened in linkage with the distributed control system to inject gas into the inner cavity of the double-layer heat storage spherical tank with nitrogen generated by the nitrogen production system; when the real-time pressure value in the cavity is greater than the upper limit value of the pressure in the cavity, the second safety valve is automatically opened to deflate the inner cavity of the double-layer heat storage spherical tank to maintain the air pressure in the inner cavity of the double-layer heat storage spherical tank between the lower limit value of the pressure in the cavity and the upper limit value of the pressure in the cavity.

[0122] In one embodiment, the control strategy corresponding to the target stage is called to control the valve in the first pipeline and the valve in the second pipeline in the compressed air energy storage device to achieve the air injection control of the gap between the double-layer tank bodies of the double-layer thermal storage spherical tank and the inner cavity of the double-layer thermal storage spherical tank, which may include:

[0123] When the target stage is the expansion energy release stage or the shutdown stage after energy release, the air compressor is in a shutdown state or a standby state, and the first electric gate valve, the first check valve, the second electric gate valve, the first electric regulating valve, the third electric gate valve and the first safety valve are controlled to be in a closed state;

[0124] The second check valve, the fourth electric gate valve, the second electric regulating valve, the fifth electric gate valve and the second safety valve are controlled to be in a closed state.

[0125] The embodiments of the present application also provide a specific implementation of an electronic device capable of implementing all the steps in the control method based on the compressed air energy storage device in the above embodiment, wherein the electronic device specifically includes the following contents: a processor, a memory, a communication interface and a bus; wherein the processor, the memory and the communication interface communicate with each other through the bus; the processor is used to call a computer program in the memory, and when the processor executes the computer program, all the steps in the control method based on the compressed air energy storage device in the above embodiment are implemented. For example, when the processor executes the computer program, the following steps are implemented:

[0126] Step 1: Determine the stage of compressed air energy storage as the target stage;

[0127] Step 2: Retrieve the control strategy corresponding to the target stage, and control the valves in the first pipeline and the valves in the second pipeline in the compressed air energy storage device to achieve air injection control of the gap between the double-layer tank bodies of the double-layer heat storage spherical tank and the inner cavity of the double-layer heat storage spherical tank.

[0128] The embodiments of the present application also provide a computer-readable storage medium capable of implementing all the steps in the control method based on the compressed air energy storage device in the above embodiment. The computer-readable storage medium stores a computer program. When the computer program is executed by a processor, all the steps in the control method based on the compressed air energy storage device in the above embodiment are implemented. For example, when the processor executes the computer program, the following steps are implemented:

[0129] Step 1: Determine the stage of compressed air energy storage as the target stage;

[0130] Step 2: Retrieve the control strategy corresponding to the target stage, and control the valves in the first pipeline and the valves in the second pipeline in the compressed air energy storage device to achieve air injection control of the gap between the double-layer tank bodies of the double-layer heat storage spherical tank and the inner cavity of the double-layer heat storage spherical tank.

[0131] As can be seen from the above description, the embodiment of the present application is provided with a first pipeline, a double-layer heat storage spherical tank, a nitrogen making system, and a second pipeline. The first end of the first pipeline is connected to the pipeline after the outlet heat exchanger of the second-stage compressor of the compressed air energy storage, and the second end is connected to the gap between the double-layer tank bodies of the double-layer heat storage spherical tank, which is used to send the dry pressurized gas sent out by the outlet heat exchanger of the second-stage compressor into the gap between the double-layer tank bodies of the double-layer heat storage spherical tank as a pressurized gas source; the first end of the second pipeline is connected to the outlet of the nitrogen making system, and the second end is connected to the inner cavity of the double-layer heat storage spherical tank, which is used to send the nitrogen produced by the nitrogen making system as a pressure-stabilizing gas source into the inner cavity of the double-layer heat storage spherical tank; a third pipeline is connected between the second end of the first pipeline and the second end of the second pipeline, and the third pipeline is used to send the nitrogen produced by the nitrogen making system as a pressure-bearing gas source into the gap between the double-layer tank bodies of the double-layer heat storage spherical tank when the compressor of the compressed air energy storage is shut down. The above scheme solves the problem of low bearing pressure of the existing single-layer heat storage spherical tank. By setting the first pipeline, the gas of the compressor can be used to fill the gap between the double layers of the double-layer heat storage spherical tank. By setting the third pipeline, nitrogen can be used for filling when the compressor is not working, which effectively saves energy consumption, achieves the purpose of simple and efficient air energy heat storage, and reduces the implementation cost while meeting the high pressure demand.

[0132] Each embodiment in this specification is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the hardware + program embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment.

[0133] The above is a description of a specific embodiment of the specification. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recorded in the claims can be performed in an order different from that in the embodiments and still achieve the desired results. In addition, the processes depicted in the drawings do not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0134] Although the present application provides method operation steps as described in the embodiments or flowcharts, more or fewer operation steps may be included based on conventional or non-creative labor. The order of steps listed in the embodiments is only one way of executing the order of many steps and does not represent the only execution order. When the actual device or client product is executed, it can be executed in the order of the method shown in the embodiments or the drawings or in parallel (for example, in a parallel processor or multi-threaded processing environment).

[0135] Although the present specification embodiment provides the method operation steps as described in the embodiment or flow chart, more or less operation steps may be included based on conventional or non-creative means. The order of steps listed in the embodiment is only one way in the order of execution of many steps, and does not represent a unique execution order. When the device or terminal product in practice is executed, it can be executed in sequence or in parallel (such as a parallel processor or a multi-threaded processing environment, or even a distributed data processing environment) according to the method shown in the embodiment or the accompanying drawings. The term "include", "comprise" or any other variant thereof is intended to cover non-exclusive inclusion, so that the process, method, product or equipment including a series of elements not only includes those elements, but also includes other elements not clearly listed, or also includes elements inherent to such process, method, product or equipment. In the absence of more restrictions, it is not excluded that there are other identical or equivalent elements in the process, method, product or equipment including the elements.

[0136] For the convenience of description, the above devices are described in various modules according to their functions. Of course, when implementing the embodiments of this specification, the functions of each module can be implemented in the same or more software and / or hardware, or the module implementing the same function can be implemented by a combination of multiple sub-modules or sub-units. The device embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0137] Those skilled in the art also know that, in addition to implementing the controller in a purely computer-readable program code, the controller can be made to implement the same function in the form of logic gates, switches, application-specific integrated circuits, programmable logic controllers, and embedded microcontrollers by logically programming the method steps. Therefore, such a controller can be considered as a hardware component, and the devices for implementing various functions included therein can also be considered as structures within the hardware component. Or even, the devices for implementing various functions can be considered as both software modules for implementing the method and structures within the hardware component.

[0138] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0139] Those skilled in the art will appreciate that the embodiments of this specification may be provided as methods, systems or computer program products. Therefore, the embodiments of this specification may take the form of complete hardware embodiments, complete software embodiments or embodiments combining software and hardware. Moreover, the embodiments of this specification may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program codes.

[0140] The present specification embodiments may be described in the general context of computer-executable instructions executed by a computer, such as program modules. Generally, program modules include routines, programs, objects, components, data structures, etc. that perform specific tasks or implement specific abstract data types. The present specification embodiments may also be practiced in distributed computing environments where tasks are performed by remote processing devices connected through a communication network. In a distributed computing environment, program modules may be located in local and remote computer storage media, including storage devices.

[0141] Each embodiment in this specification is described in a progressive manner, and the same and similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment. In the description of this specification, the description of the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiment of this specification. In this specification, the schematic representation of the above terms does not necessarily target the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, in the absence of contradiction, a person skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0142] The above is only an example of the embodiment of the present specification and is not intended to limit the embodiment of the present specification. For those skilled in the art, the embodiment of the present specification may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the embodiment of the present specification shall be included in the scope of the claims of the embodiment of the present specification.

Claims

1. A compressed air energy storage and heat storage device, characterized in that: include: The first pipeline, double-layer heat storage spherical tank, nitrogen production system, and the second pipeline, including: The first pipeline has a first end connected to a pipeline behind the outlet heat exchanger of the second stage compressor of the compressed air energy storage, and a second end connected to the gap between the double-layer tank bodies of the double-layer heat storage spherical tank, and is used to deliver the dry pressurized gas delivered by the outlet heat exchanger of the second stage compressor into the gap between the double-layer tank bodies of the double-layer heat storage spherical tank as a pressurized gas source; The second pipeline has a first end connected to the outlet of the nitrogen production system and a second end connected to the inner cavity of the double-layer thermal storage spherical tank, and is used to deliver the nitrogen produced by the nitrogen production system into the inner cavity of the double-layer thermal storage spherical tank as a pressure-stabilizing gas source; A third pipeline is connected between the second end of the first pipeline and the second end of the second pipeline, and the third pipeline is used to deliver the nitrogen produced by the nitrogen production system as a pressurized gas source into the gap between the double-layer tank bodies of the double-layer thermal storage spherical tank when the compressor of the compressed air energy storage is stopped; Among them, high-pressure saturated water and nitrogen are stored in the inner cavity of the double-layer heat storage spherical tank, pressurized dry air and / or nitrogen are filled between the double-layer tank bodies of the double-layer heat storage spherical tank, supporting connecting parts are evenly arranged between the double-layer tank bodies of the double-layer heat storage spherical tank, and the outer wall of the outer tank body of the double-layer heat storage spherical tank is installed with a supporting base and a thermal insulation layer.

2. The compressed air energy storage and heat storage device according to claim 1, characterized in that: The first pipeline is provided with: a first electric gate valve, a first check valve, a second electric gate valve, a first electric regulating valve, and a third electric gate valve in sequence; wherein the first electric gate valve is used to control the on-off of the inlet direction of the first pipeline, the first check valve is used to prevent the gas in the first pipeline from flowing back to the compressor, the second electric gate valve is used to control the on-off of the outlet direction of the first pipeline, the first electric regulating valve is used to adjust the gas supply pressure of the first pipeline, and the third electric gate valve is used to cut off the first electric regulating valve when the first electric regulating valve is overhauled; The second pipeline is provided with: a second check valve, a fourth electric gate valve, a second electric regulating valve, and a fifth electric gate valve in sequence; wherein the second check valve is used to prevent the nitrogen in the second pipeline from flowing back, the fourth electric gate valve is used to control the on-off of the outlet direction of the second pipeline, the second electric regulating valve is used to adjust the pressure of the nitrogen supply of the second pipeline, and the fifth electric gate valve is used to cut off the second electric regulating valve when the second electric regulating valve is overhauled; The third pipeline is provided with a third check valve and a sixth electric gate valve in sequence; wherein the third check valve is used to prevent gas reflux from causing air to enter the inner cavity of the double-layer heat storage spherical tank and cause corrosion of the inner cavity, and the sixth electric gate valve is used to control the on-off of the connectivity between the first pipeline and the second pipeline.

3. The compressed air energy storage and heat storage device according to claim 2, characterized in that: Also includes: A first pressure monitor, a second pressure monitor, a first safety valve, a second safety valve, wherein the first safety valve is connected to the third electric gate valve, and the second safety valve is connected to the fifth electric gate valve, wherein: The first pressure monitor is used to monitor the air pressure of the gap between the double-layer tank bodies of the double-layer thermal storage spherical tank as the real-time gap pressure value, and when the real-time gap pressure value is greater than the upper limit of the gap pressure, control the first safety valve to open to release pressure to the air; The second pressure monitor is used to monitor the air pressure in the inner cavity of the double-layer heat storage spherical tank as the real-time pressure value in the cavity. When the real-time pressure value in the cavity is greater than the upper limit value of the pressure in the cavity, the second safety valve is controlled to open to release pressure to the air.

4. The compressed air energy storage and heat storage device according to claim 2, characterized in that: Also includes: A first pressure monitor, a second pressure monitor, wherein: The first pressure monitor is used to monitor the air pressure of the gap between the double-layer tank bodies of the double-layer thermal storage spherical tank as the real-time gap pressure value, and when the real-time gap pressure value is less than the lower limit of the gap pressure, the monitored real-time gap pressure value is sent to the distributed control system to control the valve in the first pipeline and replenish air in the gap between the double-layer tank bodies of the double-layer thermal storage spherical tank; The second pressure monitor is used to monitor the air pressure in the inner cavity of the double-layer heat storage spherical tank as the real-time pressure value in the cavity. When the real-time pressure value in the cavity is less than the lower limit value of the pressure in the cavity, the monitored real-time pressure value in the cavity is sent to the distributed control system to control the valve in the second pipeline and replenish air in the inner cavity of the double-layer heat storage spherical tank.

5. A control method for a compressed air energy storage device according to any one of claims 1 to 4, characterized in that: include: Determine the stage of compressed air energy storage as the target stage; The control strategy corresponding to the target stage is called up to control the valves in the first pipeline and the valves in the second pipeline in the compressed air energy storage device to realize the gas injection control of the gap between the double-layer tank bodies of the double-layer heat storage spherical tank and the inner cavity of the double-layer heat storage spherical tank.

6. The method according to claim 5, characterized in that The stages of compressed air energy storage include: compression energy storage stage, shutdown energy storage stage, expansion energy release stage and shutdown stage after energy release.

7. The method according to claim 6, characterized in that The control strategy corresponding to the target stage is retrieved to control the valve in the first pipeline and the valve in the second pipeline in the compressed air energy storage device to realize the air injection control of the gap between the double-layer tank bodies of the double-layer thermal storage spherical tank and the inner cavity of the double-layer thermal storage spherical tank, including: In the case where the target stage is the compression energy storage stage, after the air compressor is started, the first electric gate valve, the first check valve, the second electric gate valve, the first electric regulating valve and the third electric gate valve are controlled to be opened, so that the dry pressurized gas sent out of the outlet heat exchanger of the second stage compressor of the compressed air energy storage flows through the first electric gate valve, the first check valve, the second electric gate valve, the first electric regulating valve, the third electric gate valve and the first safety valve in sequence as a pressurized gas source and is sent into the gap between the double-layer tank bodies of the double-layer heat storage spherical tank; The air pressure of the gap between the double-layer tank bodies of the double-layer thermal storage spherical tank is monitored by a first pressure monitor as a real-time gap pressure value. When the real-time gap pressure value reaches a gap full air threshold, the real-time gap pressure value is sent to a distributed control system, and the first electric gate valve, the second electric gate valve and the third electric gate valve are closed in linkage through the distributed control system; The air pressure of the gap between the double-layer tank bodies of the double-layer heat storage spherical tank is continuously monitored by the first pressure monitor as the real-time gap pressure value. When the real-time gap pressure value is less than the lower limit of the gap pressure, the real-time gap pressure value is sent to the distributed control system, and the first electric gate valve, the second electric gate valve and the third electric gate valve are opened through the distributed control system to inject air into the gap between the double-layer tank bodies of the double-layer heat storage spherical tank. When the real-time gap pressure value is greater than the upper limit of the gap pressure, the first safety valve is automatically opened to deflate the gap between the double-layer tank bodies of the double-layer heat storage spherical tank, so as to maintain the air pressure of the gap between the double-layer tank bodies of the double-layer heat storage spherical tank between the lower limit of the gap pressure and the upper limit of the gap pressure, wherein the gap full air threshold is greater than the lower limit of the gap pressure and less than the upper limit of the gap pressure.

8. The method according to claim 7, characterized in that When the target stage is the compression energy storage stage, after the air compressor is started, the method further includes: Start the nitrogen generation system, and the nitrogen generated by the nitrogen generation system flows sequentially through the second check valve, the fourth electric gate valve, the second electric regulating valve, the fifth electric gate valve and the second safety valve into the inner cavity of the double-layer heat storage spherical tank; The air pressure in the inner cavity of the double-layer heat storage spherical tank is monitored by a second pressure monitor as a real-time pressure value in the cavity. When the real-time pressure value in the cavity reaches a full-gas threshold in the cavity, the real-time pressure value in the cavity is sent to the distributed control system, and the fourth electric gate valve and the fifth electric gate valve are closed in linkage through the distributed control system; The air pressure of the inner cavity of the double-layer heat storage spherical tank is continuously monitored as the real-time pressure value in the cavity by the second pressure monitor. When the real-time pressure value in the cavity is less than the lower limit value of the pressure in the cavity, the real-time pressure value in the cavity is sent to the distributed control system, and the fourth electric gate valve and the fifth electric gate valve are opened through the distributed control system to inject air into the inner cavity of the double-layer heat storage spherical tank. When the real-time pressure value in the cavity is greater than the upper limit value of the pressure in the cavity, the second safety valve is automatically opened to deflate the inner cavity of the double-layer heat storage spherical tank to maintain the air pressure in the inner cavity of the double-layer heat storage spherical tank between the lower limit value of the pressure in the cavity and the upper limit value of the pressure in the cavity, wherein the full air threshold value in the cavity is greater than the lower limit value of the pressure in the cavity and less than the upper limit value of the pressure in the cavity.

9. The method according to claim 7, characterized in that: The control strategy corresponding to the target stage is retrieved to control the valve in the first pipeline and the valve in the second pipeline in the compressed air energy storage device to realize the air injection control of the gap between the double-layer tank bodies of the double-layer thermal storage spherical tank and the inner cavity of the double-layer thermal storage spherical tank, including: When the target stage is the shutdown energy storage stage, the air compressor is in a shutdown state or a standby state, and the first electric gate valve, the first check valve, the second electric gate valve, the first electric regulating valve, the third electric gate valve and the first safety valve are in a closed state; The air pressure of the gap between the double-layer tank bodies of the double-layer heat storage spherical tank is continuously monitored by the first pressure monitor. When the real-time gap pressure value is less than the lower limit of the gap pressure, the real-time gap pressure value is sent to the distributed control system, and the fourth electric gate valve, the fifth electric gate valve and the sixth electric gate valve are opened in linkage with the distributed control system to inject gas into the gap between the double-layer tank bodies of the double-layer heat storage spherical tank through the nitrogen generated by the nitrogen production system; when the real-time gap pressure value is greater than the upper limit of the gap pressure, the first safety valve is automatically opened to deflate the gap between the double-layer tank bodies of the double-layer heat storage spherical tank, so as to maintain the air pressure of the gap between the double-layer tank bodies of the double-layer heat storage spherical tank between the lower limit of the gap pressure and the upper limit of the gap pressure; The air pressure in the inner cavity of the double-layer heat storage spherical tank is continuously monitored as the real-time pressure value in the cavity by the second pressure monitor. When the real-time pressure value in the cavity is less than the lower limit value of the pressure in the cavity, the real-time pressure value in the cavity is sent to the distributed control system, and the fourth electric gate valve and the fifth electric gate valve are opened in linkage with the distributed control system to inject gas into the inner cavity of the double-layer heat storage spherical tank with nitrogen generated by the nitrogen production system; when the real-time pressure value in the cavity is greater than the upper limit value of the pressure in the cavity, the second safety valve is automatically opened to deflate the inner cavity of the double-layer heat storage spherical tank to maintain the air pressure in the inner cavity of the double-layer heat storage spherical tank between the lower limit value of the pressure in the cavity and the upper limit value of the pressure in the cavity.

10. The method according to claim 6, characterized in that The control strategy corresponding to the target stage is retrieved to control the valve in the first pipeline and the valve in the second pipeline in the compressed air energy storage device to realize the air injection control of the gap between the double-layer tank bodies of the double-layer thermal storage spherical tank and the inner cavity of the double-layer thermal storage spherical tank, including: When the target stage is the expansion energy release stage or the shutdown stage after energy release, the air compressor is in a shutdown state or a standby state, and the first electric gate valve, the first check valve, the second electric gate valve, the first electric regulating valve, the third electric gate valve and the first safety valve are controlled to be in a closed state; The second check valve, the fourth electric gate valve, the second electric regulating valve, the fifth electric gate valve and the second safety valve are controlled to be in a closed state.

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