Heat storage system with heat preservation and storage structure

Abstract

The application relates to a heat preservation and storage structure of a heat storage system, which comprises a double-tank heat storage system, a heat insulation floating roof which rises and falls in a tank body along with the change of the liquid level of a heat storage medium in the tank body, a heat storage and insulation layer which covers the outer surface of a high-temperature tank and is internally hollow to form a water passing gap, the water passing gap is filled with cooling water which is used for heat exchange with the heat emitted by the outer surface of the high-temperature tank, the top of the heat storage and insulation layer is provided with a hot water outlet which is communicated with the water passing gap, and the bottom of the heat storage and insulation layer is provided with a cooling water inlet which is communicated with the water passing gap; and a circulating water tank which is connected with the cooling water inlet and the hot water outlet respectively and is used for supplying the cooling water which is heated through heat exchange to users. The heat preservation and storage structure of the heat storage system designed by the application can effectively reduce the heat loss of the heat storage system, improve the heat storage efficiency, and effectively utilize the heat emitted by the tank body through the structural design of the heat storage and insulation layer, so that the heat energy utilization efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of energy storage technology, and in particular to an insulated thermal storage structure for a thermal storage system. Background Technology

[0002] In existing technologies, the most common thermal storage system currently employs a dual-tank thermal storage model, which includes a high-temperature tank for storing high-temperature thermal storage media and a low-temperature tank for storing low-temperature thermal storage media. During the operating cycle of this system, the high-temperature thermal storage media flows between the high-temperature and low-temperature tanks to absorb and release heat.

[0003] However, the existing dual-tank thermal storage system has a significant heat loss problem:

[0004] During the heat absorption, heat release and heat storage process, a large amount of heat exchange occurs between the high-temperature heat storage medium and the tank wall, which will dissipate a large amount of heat to the surrounding environment. Although insulation is carried out in traditional engineering, the outer surface temperature of the insulation layer can still reach 40℃~60℃. At the same time, due to the large heat dissipation area of ​​the tank, the temperature drop of the tank can reach 3~5℃ / hour, resulting in high system heat loss rate and low efficiency.

[0005] Especially during the heat storage process, the high-temperature heat storage medium has a large area of ​​direct contact with the air at the top of the high-temperature storage tank, which will dissipate a lot of heat into the environment and aggravate heat loss.

[0006] Cryogenic storage tanks also have similar problems, with a relatively large total heat loss rate in the system;

[0007] Existing improvement methods, such as increasing the insulation of storage tanks, have limited effectiveness and cannot fundamentally solve the problem of heat loss.

[0008] Therefore, how to reduce heat loss in thermal storage systems, improve their thermal storage efficiency, and potentially enhance the utilization efficiency of thermal energy are technical problems that urgently need to be solved in this field. Summary of the Invention

[0009] To address the aforementioned problems, this invention provides a thermal insulation and heat storage structure for a thermal storage system that can significantly reduce heat loss, improve thermal storage efficiency, effectively utilize heat dissipation to recover heat, and improve thermal energy utilization efficiency.

[0010] To achieve the above objectives, the thermal storage structure of the thermal storage system designed in this invention includes: a dual-tank thermal storage system, comprising a high-temperature tank for storing a high-temperature thermal storage medium and a low-temperature tank for storing a low-temperature thermal storage medium; and an insulated floating roof disposed within the high-temperature and low-temperature tanks. The insulated floating roof is attached to the surface of the thermal storage medium inside the tank and rises and falls within the tank according to the change in the liquid level of the thermal storage medium. Furthermore, the outer contour of the insulated floating roof is adapted to the inner contour of the tank, serving to prevent heat transfer between the thermal storage medium at the bottom of the tank and the upper space of the tank. The system includes a heat storage and insulation layer covering the outer surface of the high-temperature tank. The insulation layer has a hollow interior forming a water-passing gap, filled with cooling water for heat exchange with the heat radiated from the high-temperature tank's exterior. The top of the insulation layer has a hot water outlet communicating with the water-passing gap, and the bottom has a cooling water inlet communicating with the gap. A circulating water tank, with its inlet and outlet connected to the cooling water inlet and hot water outlet respectively, supplies the heated cooling water to the user and replenishes the water-passing gap with cooling water through the cooling water inlet. During operation, the high-temperature heat storage medium is pumped from the high-temperature tank into an external heat absorption system via a high-temperature pump, where it releases heat and is cooled. The cooled heat storage medium is then pumped into a low-temperature tank for storage by a low-temperature pump. When heat is needed, the low-temperature heat storage medium is pumped from the low-temperature tank into an external heat release system via a low-temperature pump, where it absorbs heat and is heated. The heated heat storage medium is then pumped into a high-temperature tank for storage by a high-temperature pump.

[0011] To ensure sufficient heat exchange and achieve an efficient heat exchange process, the heat storage insulation layer is made of polytetrafluoroethylene, and the water passage gap is 30-50mm.

[0012] To ensure the stable operation of the system, the circulating water tank has a water supply pipe and a water return pipe. The cooling water inlet is connected to the circulating water tank through the water supply pipe, and the water supply pipe is provided with a first shut-off valve, a circulating pump, a check valve and a second shut-off valve in sequence from the water supply direction. The hot water outlet is connected to the circulating water tank through the water return pipe.

[0013] To avoid potential overheating issues in the system, a temperature control valve is installed on the return water pipe. The temperature measuring point of the temperature control valve is set at the hot water outlet. When the water temperature at the hot water outlet is higher than the set value, the temperature control valve opens, allowing the cooling water that has been heated by heat exchange to enter the circulating water tank through the return water pipe.

[0014] To prevent safety hazards caused by accidents such as damage to the thermal insulation layer or circulating water tank, an emergency water pipe is also included, connecting the cooling water inlet and the check valve. The emergency water pipe is equipped with a quick-opening valve, which is used to open in the event of an accident involving the thermal insulation layer or circulating water tank, so as to allow water to be discharged from the emergency water pipe.

[0015] For structural reinforcement and stability, an insulation layer is provided between the heat storage insulation layer and the outer surface of the high-temperature tank. A protective layer is provided on the outer surface of the heat storage insulation layer. The protective layer includes a steel reinforcement frame and an aluminum sheet protective layer. The steel reinforcement frame is installed on the outer surface of the heat storage insulation layer, and the aluminum sheet protective layer is laid on the outer surface of the steel reinforcement frame to cover the heat storage insulation layer.

[0016] To provide excellent thermal insulation performance, the insulated floating roof is a hollow structure made of heat-resistant ceramic material.

[0017] To ensure the normal operation of the thermal storage system, the dual-tank thermal storage system also includes a high-temperature pump and a low-temperature pump. The low-temperature pump is used to transport the high-temperature thermal storage medium in the high-temperature tank to an external heat release system. After being cooled by the heat release system, it is sent to the low-temperature tank for storage. The high-temperature pump is used to transport the low-temperature thermal storage medium in the low-temperature tank to an external heat absorption system. After being heated by the heat absorption system, it is sent to the high-temperature tank for storage. The insulated floating roof is provided with openings for the pump pipes of the high-temperature pump and the low-temperature pump to pass through.

[0018] A further option is to install electric heating wires around the insulated floating roof and the opening, which are used to heat the salt deposited on the edge of the insulated floating roof and the opening, melting it into a liquid state.

[0019] In order to actively control the heat dissipation of the tank, a floating roof position control device is also included, which is used to control the raising and lowering position of the insulated floating roof inside the tank. When the insulated floating roof is raised, the heat dissipation of the high-temperature tank to the outer heat storage insulation layer increases.

[0020] The thermal insulation structure of the thermal storage system designed in this invention can effectively reduce heat loss and improve thermal storage efficiency through the insulated floating roof. Furthermore, the structural design of the thermal insulation layer effectively utilizes the heat dissipated from the tank, improving its thermal energy utilization efficiency and enhancing the system's energy-saving and environmental protection effects. At the same time, the controllable insulated floating roof can adjust the thermal storage output, flexibly adapting to the heat load demand at different times and improving the system's adaptability. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the dual-tank thermal storage system in Embodiment 1 of the present invention;

[0022] Figure 2 This is a schematic diagram of the structure of the heat-insulating floating roof in Embodiment 1 of the present invention;

[0023] Figure 3 This is a plan view of the insulated floating roof in Embodiment 1 of the present invention;

[0024] Figure 4 This is a schematic diagram of the structure of the heat storage insulation layer in Embodiment 1 of the present invention;

[0025] Figure 5 This is a schematic diagram of the protective layer structure in Embodiment 1 of the present invention;

[0026] Figure 6 This is a schematic diagram of the structure of the heat-insulated floating roof in Embodiment 2 of the present invention;

[0027] Figure 7 This is a plan view of the insulated floating roof in Embodiment 2 of the present invention.

[0028] Among them: high temperature tank 100, high temperature pump 101, low temperature tank 200, low temperature pump 201, insulated floating roof 10, floating box 11, positioning support 12, heat storage insulation layer 20, hot water outlet 21, cooling water inlet 22, water passage gap 30, circulating water tank 40, water supply pipe 41, return water pipe 42, first shut-off valve 43, circulating pump 44, check valve 46, second shut-off valve 45, temperature control valve 47, emergency water pipe 50, quick-opening valve 51, insulation layer 60, protective layer 70, steel reinforcement frame 71, aluminum sheet protective layer 72, electric heating wire 80, opening 90. Detailed Implementation

[0029] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0030] Example 1.

[0031] like Figure 1-5As shown, the thermal insulation and thermal storage structure of the thermal storage system described in this embodiment includes: a dual-tank thermal storage system, which has a high-temperature tank 100 for storing high-temperature thermal storage medium and a low-temperature tank 200 for storing low-temperature thermal storage medium; it also includes: an insulated floating roof 10, disposed in the high-temperature tank 100 and the low-temperature tank 200, the insulated floating roof 10 being attached to the surface of the thermal storage medium inside the tank and rising and falling inside the tank as the liquid level of the thermal storage medium changes, and the outer contour of the insulated floating roof 10 being adapted to the inner contour of the tank, used to block heat exchange between the thermal storage medium at the bottom of the tank and the upper space of the tank; and a thermal insulation layer 20. A heat storage and insulation layer 20 is formed inside a hollow space to form a water passage gap 30, which is covered on the outer surface of the high-temperature tank 100. The water passage gap 30 is filled with cooling water for exchanging heat with the heat emitted from the surface of the high-temperature tank 100. The top of the heat storage and insulation layer 20 is provided with a hot water outlet 21 communicating with the water passage gap 30, and the bottom is provided with a cooling water inlet 22 communicating with the water passage gap 30. A circulating water tank 40 is connected to the cooling water inlet 22 and the hot water outlet 21 respectively, for supplying the user with the cooling water after heat exchange and heating, and for replenishing the cooling water into the water passage gap 30 through the cooling water inlet 22. In this embodiment, the dual-tank thermal storage system further includes a high-temperature pump 101 and a low-temperature pump 201. The low-temperature pump 201 is used to transport the high-temperature thermal storage medium in the high-temperature tank 100 to an external heat release system, and after being cooled by the heat release system, it is sent to the low-temperature tank 200 for storage. The high-temperature pump 101 is used to transport the low-temperature thermal storage medium in the low-temperature tank 200 to an external heat absorption system, and after being heated by the heat absorption system, it is sent to the high-temperature tank 100 for storage.During operation, when heat is needed, the cryogenic pump 201 draws the high-temperature heat storage medium from the high-temperature tank 100, cools it through the heat release system, and then pumps it into the cryogenic tank 200 for storage. When heat storage is needed, the high-temperature pump 101 draws the low-temperature heat storage medium from the cryogenic tank 200, heats it through the heat absorption system, and then pumps it into the high-temperature tank 100 for storage, ensuring the normal operation of the dual-tank heat storage system. During this process, the upper spaces of the high-temperature tank 100 and the cryogenic tank 200 are filled with gas. The insulated floating roof 10 hinders the heat transfer between the heat storage medium and the gas inside the tanks and rises and falls within the tanks as the liquid level of the heat storage medium changes, thereby reducing the temperature of the upper part of the tanks. This reduces the heat dissipation area of ​​the heat storage medium inside the tanks, thus reducing the heat release to the environment. Meanwhile, the heat storage insulation layer 20 on the outer surface of the high-temperature tank 100, filled with cooling water in its internal water passage 30, can recover the heat dissipated by the heat storage medium inside the high-temperature tank 100 through the tank wall, improving energy utilization efficiency. Since water has a lower density at higher temperatures, the water temperature at the top of the heat storage insulation layer 20 is the highest after heat exchange and the water temperature at the bottom is the lowest, resulting in smoother cooling water circulation. This allows the circulating water tank 40 to replenish cooling water into the water passage 30 through the cooling water inlet 22 at the bottom of the heat storage insulation layer 20. The cooled water, after heat exchange and heating, is supplied to users from the hot water outlet 21 at the top of the heat storage insulation layer 20, such as for use as hot water for showers in factory dormitories. In this way, the heat dissipation from the tank body is recovered and reused through the heat storage insulation layer 20, significantly reducing heat loss, improving the heat storage efficiency of the heat storage system, and achieving energy saving and environmental protection effects.

[0032] In some embodiments, to ensure sufficient heat exchange and achieve an efficient heat exchange process, the heat storage insulation layer 20 is made of polytetrafluoroethylene (PTFE), and the water passage gaps 30 have a spacing of 30-50 mm. In this embodiment, using PTFE improves the heat resistance and safety of the heat storage insulation layer 20, and by rationally setting the spacing of the water passage gaps 30, costs can be saved while ensuring sufficient heat exchange. Furthermore, the heat dissipation from the high-temperature tank 100 can be stably and safely recycled, thereby improving the system's thermal efficiency.

[0033] In some embodiments, such as Figure 4As shown, to ensure stable system operation, the circulating water tank 40 has a water supply pipe 41 and a return water pipe 42. The cooling water inlet 22 is connected to the circulating water tank 40 through the water supply pipe 41, and the water supply pipe 41 is equipped with a first shut-off valve 43, a circulating pump 44, a check valve 46, and a second shut-off valve 45 in sequence from the water supply direction. The hot water outlet 21 is connected to the circulating water tank 40 through the return water pipe 42. A complete water supply and return pipeline is set up, and the first shut-off valve 43, circulating pump 44, check valve 46, and second shut-off valve 45 are installed on the water supply pipe 41. The cooling water supply is controlled according to the process requirements to achieve continuous and effective replenishment of cooling water, ensuring that the heat storage insulation layer 20 has sufficient cooling water for heat exchange, and improving the stable and reliable operation and safety of the system structure.

[0034] In some embodiments, such as Figure 4 As shown, a temperature control valve 47 is installed on the return water pipe 42. The temperature measuring point of the temperature control valve 47 is set at the hot water outlet 21. When the water temperature at the hot water outlet 21 is higher than the set value, the temperature control valve 47 opens, allowing the cooled water after heat exchange and heating to enter the circulating water tank 40 through the return water pipe 42. In this embodiment, the temperature control valve 47 can monitor the hot water temperature in real time. When the hot water temperature exceeds the preset value, the temperature control valve 47 will open, allowing the cooled water to flow into the circulating water tank 40 for user use. Preferably, when the temperature control valve 47 opens, the circulating pump 44 is simultaneously turned on to supplement the cooling water to the water gap 30 to maintain the liquid level not lower than the hot water outlet 21 interface, ensuring the stable operation of the system. This design can avoid unnecessary energy consumption, save electricity, and ensure that the system only circulates water when needed, achieving the purpose of energy saving.

[0035] In some embodiments, such as Figure 4 As shown, to address safety hazards caused by accidents such as damage to the thermal insulation layer 20 or the circulating water tank 40, an emergency water pipe 50 is also included, connecting the cooling water inlet 22 and the check valve 46. The emergency water pipe 50 is equipped with a quick-opening valve 51, which is used to open in case of an accident involving the thermal insulation layer 20 or the circulating water tank 40, allowing water to drain from the emergency water pipe 50. Thus, the emergency water pipe 50 and the quick-opening valve 51 provide a rapid drainage channel. When the system structure experiences damage or leakage, water can be promptly drained to an external emergency water pool or tank, preventing larger safety accidents and effectively improving the safety and emergency response capability of the system structure.

[0036] In some embodiments, such as Figure 4 and Figure 5As shown, a heat insulation layer 60 is provided between the heat storage insulation layer 20 and the outer surface of the high-temperature tank 100. A protective layer 70 is provided on the outer surface of the heat storage insulation layer 20. The protective layer 70 includes a steel reinforcement frame 71 and an aluminum sheet protective layer 72. The steel reinforcement frame 71 is provided on the outer surface of the heat storage insulation layer 20, and the aluminum sheet protective layer 72 is laid on the outer surface of the steel reinforcement frame 71 to cover the heat storage insulation layer 20. In this embodiment, the insulation layer 60 reduces the heat transfer from the inside of the high-temperature tank 100 to the outside, maintaining a stable internal temperature, which helps improve the efficiency of heat energy utilization and reduce energy waste. The steel reinforcement frame 71 makes the heat storage insulation layer 20 more robust and stable, thereby enhancing the overall rigidity of the system and improving the seismic and deformation resistance of the system structure. At the same time, the external aluminum protective layer 72 serves as a protective layer, preventing direct damage to the heat storage insulation layer 20 from the external environment, such as corrosion and physical damage, which can effectively enhance the durability and service life of the system structure.

[0037] In some embodiments, such as Figure 2 As shown, the insulated floating roof 10 is a hollow structure made of heat-resistant ceramic material. This utilizes the high-temperature resistance and low thermal conductivity of ceramic material to block heat radiation and isolate heat convection, meeting the operating conditions of the insulated floating roof 10. Simultaneously, the hollow structure minimizes solid heat conduction. This design provides excellent insulation performance and effectively reduces heat loss at the top of the tank.

[0038] In some embodiments, such as Figure 2 and Figure 3 As shown, to ensure the normal operation of the thermal storage system, the insulated floating roof 10 is provided with an opening 90 for the pump pipes of the high-temperature pump 101 and the low-temperature pump 201 to pass through. The opening 90 allows the insulated floating roof 10 to perform its thermal insulation function without affecting the flow and exchange of the medium between the two tanks in the entire thermal storage system, thereby ensuring that the system can operate normally and safely.

[0039] In some embodiments, such as Figure 2 and Figure 3 As shown, a further embodiment involves equipping the insulated floating roof 10 and the opening 90 with electric heating wires 80. These heating wires 80 heat the salt deposits at the edges of the insulated floating roof 10 and the opening 90, melting them into a liquid state. In this embodiment, the dual-tank thermal storage system is a molten salt dual-tank thermal storage system. The electric heating wires 80 effectively prevent salt crystals that may accumulate at the edges of the insulated floating roof 10 and the opening 90 from hindering the movement of the insulated floating roof 10 or blocking the opening 90. This ensures the normal operation of the insulated floating roof 10 and the flow of the thermal storage medium, thereby improving the reliability of the system operation.

[0040] In some embodiments, a floating roof position control device (not shown) is also included to control the lifting and lowering position of the insulated floating roof 10 within the tank. When the floating roof 10 is raised, the heat dissipation from the high-temperature tank 100 to the outer heat storage insulation layer 20 increases. The floating roof position control device allows control of the height of the insulated floating roof 10 within the tank. Specifically, during peak water usage periods, the floating roof 10 can be raised by the device. This raising and lowering action increases the gap between the heat storage medium within the tank and the insulated floating roof 10, allowing for full contact between the high-temperature heat storage medium inside the high-temperature tank 100 and the gas in the upper space of the tank. This increases the heat dissipation from the tank wall to the heat storage insulation layer 20, thereby increasing heat output during peak periods to meet the plant's heating needs. During off-peak periods, the floating roof position control device adjusts the position of the insulated floating roof 10 to isolate heat exchange between the heat storage medium inside the tank and the gas in the upper space of the tank, reducing heat dissipation and saving energy. Overall, this improves the system's adaptability and thermal efficiency. In this embodiment, the floating roof position control device can adopt an electric actuator (not shown in the figure). The electric actuator can include a lead screw motor fixed to the top of the tank, a guide rail, and a slider connected to the insulated floating roof 10. During operation, the lead screw motor drives the lead screw to rotate, thereby driving the slider and the floating roof to rise and fall along the guide rail. The start and stop of the motor are controlled by a PLC program, which starts and stops in real time according to signals from liquid level sensors, temperature sensors, etc. The PLC program can preset the target position of the insulated floating roof 10 for different time periods, and determine whether to rise or fall based on real-time monitoring signals, intelligently adjusting the position of the insulated floating roof 10, so that the position control of the insulated floating roof 10 is accurate and reliable, and meets the needs of flexible adjustment.

[0041] The thermal insulation structure of the thermal storage system provided in this embodiment can effectively reduce heat loss and improve thermal storage efficiency through the insulated floating roof. Furthermore, the structural design of the thermal insulation layer effectively utilizes the heat dissipated from the tank, improving its thermal energy utilization efficiency and enhancing the system's energy-saving and environmental protection effects. At the same time, the controllable insulated floating roof can be used to adjust the thermal storage output, flexibly adapting to the heat load demand at different times and improving the system's adaptability.

[0042] Example 2.

[0043] The thermal insulation and thermal storage structure of the thermal storage system described in this embodiment differs from that described in Embodiment 1 in that, as Figure 6 and Figure 7 As shown, a floating box 11 is arranged at the bottom of the insulated floating roof 10. The floating box 11 can be made of stainless steel cylinder. The hollow floating box 11 ensures that the insulated floating roof 10 can always be at the top of the heat storage medium. At the same time, positioning supports 12 can be arranged around the floating box 11. The positioning supports 12 can ensure that the floating box 11 is at the center of the insulated floating roof 10 and ensure that the insulated floating roof 10 does not tilt.

[0044] In the description of this invention, it should be noted that the terms "vertical," "upper," "lower," "horizontal," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0045] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0046] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A thermal insulation and thermal storage structure for a thermal storage system, comprising: A dual-tank thermal storage system comprising a high-temperature tank (100) for storing high-temperature thermal storage medium and a low-temperature tank (200) for storing low-temperature thermal storage medium; characterized in that it further comprises: an insulated floating roof (10) disposed in the high-temperature tank (100) and the low-temperature tank (200), the insulated floating roof (10) being attached to the surface of the thermal storage medium inside the tank and rising and falling within the tank as the liquid level of the thermal storage medium changes, and the outer contour of the insulated floating roof (10) being adapted to the inner contour of the tank, for preventing heat exchange between the thermal storage medium at the bottom of the tank and the upper space of the tank; and a thermal insulation layer (20) covering the outer surface of the high-temperature tank (100). Furthermore, the heat storage insulation layer (20) has a hollow interior forming a water passage gap (30), which is filled with cooling water for exchanging heat with the heat emitted from the surface of the high-temperature tank (100). The top of the heat storage insulation layer (20) is provided with a hot water outlet (21) communicating with the water passage gap (30), and the bottom is provided with a cooling water inlet (22) communicating with the water passage gap (30). The circulating water tank (40) has its inlet and outlet connected to the cooling water inlet (22) and the hot water outlet (21) respectively, for supplying the user with the cooling water after heat exchange and heating, and replenishing the cooling water in the water passage gap (30) through the cooling water inlet (22).

2. The thermal insulation and thermal storage structure of the thermal storage system according to claim 1, characterized in that, The heat storage insulation layer (20) is made of polytetrafluoroethylene, and the water passage gap (30) has a spacing of 30-50mm.

3. The thermal insulation and thermal storage structure of the thermal storage system according to claim 2, characterized in that, The circulating water tank (40) has a water supply pipe (41) and a return water pipe (42). The cooling water inlet (22) is connected to the circulating water tank (40) through the water supply pipe (41). The water supply pipe (41) is provided with a first shut-off valve (43), a circulating pump (44), a check valve (46), and a second shut-off valve (45) in sequence from the water supply direction. The hot water outlet (21) is connected to the circulating water tank (40) through the return water pipe (42).

4. The thermal insulation and thermal storage structure of the thermal storage system according to claim 3, characterized in that, A temperature control valve (47) is installed on the return water pipe (42). The temperature measuring point of the temperature control valve (47) is set at the hot water outlet (21). When the water temperature at the hot water outlet (21) is higher than the set value, the temperature control valve (47) opens, allowing the cooling water after heat exchange and heating to enter the circulating water tank (40) through the return water pipe (42).

5. The thermal insulation and thermal storage structure of the thermal storage system according to claim 3, characterized in that, It also includes an emergency water pipe (50) connected between the cooling water inlet (22) and the check valve (46), and the emergency water pipe (50) is equipped with a quick-opening valve (51), which is used to open the heat storage insulation layer (20) or the circulating water tank (40) in case of an accident so that the emergency water pipe (50) can discharge water.

6. The thermal insulation and thermal storage structure of the thermal storage system according to claim 1, characterized in that, A heat insulation layer (60) is provided between the heat storage insulation layer (20) and the outer surface of the high temperature tank (100). A protective layer (70) is provided on the outer surface of the heat storage insulation layer (20). The protective layer (70) includes a steel reinforcement frame (71) and an aluminum sheet protective layer (72). The steel reinforcement frame (71) is located on the outer surface of the heat storage insulation layer (20), and the aluminum sheet protective layer (72) is laid on the outer surface of the steel reinforcement frame (71) to cover the heat storage insulation layer (20).

7. The thermal insulation and thermal storage structure of the thermal storage system according to claim 1, characterized in that, The insulated floating roof (10) is a hollow structure made of heat-resistant ceramic material.

8. The thermal insulation and thermal storage structure of the thermal storage system according to claim 1 or 7, characterized in that, The dual-tank thermal storage system also includes a high-temperature pump (101) and a low-temperature pump (201). The low-temperature pump (201) is used to transport the high-temperature thermal storage medium in the high-temperature tank (100) to an external heat release system. After being cooled by the heat release system, it is sent to the low-temperature tank (200) for storage. The high-temperature pump (101) is used to transport the low-temperature thermal storage medium in the low-temperature tank (200) to an external heat absorption system. After being heated by the heat absorption system, it is sent to the high-temperature tank (100) for storage. An opening (90) is provided on the insulated floating roof (10) for the pump pipes of the high-temperature pump (101) and the low-temperature pump (201) to pass through.

9. The thermal insulation and thermal storage structure of the thermal storage system according to claim 8, characterized in that, An electric heating wire (80) is provided around the insulated floating roof (10) and the opening (90). The electric heating wire (80) is used to heat the salt deposited on the edge of the insulated floating roof (10) and the opening (90) and melt it into a liquid state.

10. The thermal insulation and thermal storage structure of the thermal storage system according to claim 1, characterized in that, It also includes a floating roof position control device for controlling the lifting and lowering position of the insulated floating roof (10) inside the tank. When the floating roof position control device controls the insulated floating roof (10) to rise, the heat dissipation of the high temperature tank (100) to the outer heat storage insulation layer (20) increases.

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