A test system and method for testing thermal performance of an intermittent heat source heat storage tank of a fusion device

Abstract

The application discloses a kind of intermittent heat source heat storage tank thermal performance test system and method of fusion device, belong to the technical field of performance detection of fusion device energy storage system core equipment, including heat storage tank operation system, auxiliary heating system and test control system, by simulating fusion reactor pulse intermittent heat source working condition, respectively to high-temperature heat storage tank and low-temperature heat storage tank in heat storage and heat release stage the internal temperature distribution, outlet temperature change and thermal stratification characteristics are tested with high precision.Test method uses double-tank circulation process, combined with automatic control to realize the accurate reproduction of charge / heat release process, and supports waste heat utilization to improve energy efficiency.The application fills the technical gap of heat storage tank thermal performance test under fusion intermittent heat source, and can provide experimental basis for efficient heat storage tank design and operation strategy optimization.

Description

Technical Field

[0001] This invention belongs to the technical field of core equipment performance testing technology for fusion device energy storage systems, specifically relating to a thermal performance testing system and method for intermittent heat source storage tanks in fusion devices. Background Technology

[0002] With the development of controlled nuclear fusion energy technology, fusion reactors, as advanced energy devices with high energy density, low carbon emissions, and high safety, are gradually moving from the physical experiment stage to the engineering demonstration and commercial application stage. In fusion reactor energy utilization systems, the high-grade thermal energy generated by fusion plasma typically needs to be recovered and utilized through energy conversion systems. Among these systems, energy storage systems, as a key intermediate link connecting the heat source and the downstream power generation system, can resolve the contradiction between the intermittent operation of the fusion reactor and the power generation system's demand for a stable heat source, thus helping to improve system stability and reliable operating life.

[0003] Unlike traditional fossil fuel or renewable energy heat sources, fusion reactor heat sources exhibit significant intermittent operation characteristics. Fusion reactors typically operate in a pulsed manner, with their output thermal power displaying a clear periodic start-stop characteristic over a time scale, characterized by short intervals and step-like changes in thermal power. In this operating mode, the thermal storage tank, as the core equipment of the energy storage system, not only needs to withstand high-temperature conditions but also needs to store and release heat under frequently changing heat input conditions. Its internal thermal stratification behavior and heat output performance directly affect the heat transfer efficiency of the thermal storage system. Therefore, accelerating breakthroughs in the technical bottlenecks of thermal storage tanks under intermittent heat source conditions in fusion reactors and developing high-efficiency thermal storage tanks for fusion reactors are of great significance for achieving stable energy conversion in my country's fusion reactors and promoting the engineering application of fusion energy.

[0004] However, existing technologies mainly focus on the airtightness testing, mechanical performance testing, molten salt corrosion testing, and performance coupling testing of thermal storage tanks, such as Chinese patent applications CN201821284758.2 (an airtightness testing device for a high-temperature molten salt storage tank), CN202411224701.3 (a testing device and method for a molten salt storage tank), CN202311017152.8 (a high-temperature molten salt corrosion testing equipment and method), and CN202111372371.9 (a high-temperature chloride salt photothermal and energy storage cycle simulation experimental platform and experimental method). These patent applications do not focus on the thermal performance of molten salt thermal storage tanks for fusion devices, nor do they involve the operating conditions of intermittent heat sources, and therefore cannot obtain the performance parameters of thermal storage tanks used in fusion devices.

[0005] Therefore, there is an urgent need for a thermal performance testing system and corresponding testing methods for thermal storage tanks that can simulate the heat source characteristics of intermittent operation of fusion reactors, which can provide reliable experimental basis and data support for the design optimization and operation strategy formulation of thermal storage systems for fusion devices. Summary of the Invention

[0006] To address the limitation of existing technologies in testing the thermal performance of thermal storage tanks, a core component of fusion reactor thermal storage systems, this invention provides a thermal performance testing system and method for intermittent heat source thermal storage tanks in fusion reactors. This system simulates the intermittent operation characteristics of a fusion reactor heat source, testing the internal medium temperature distribution and output temperature variation patterns of high-temperature and low-temperature thermal storage tanks under intermittent heat source conditions. It obtains the temperature distribution and heat output patterns of molten salt thermal storage tanks during fusion reactor operation and intermittent periods, and evaluates their thermal stratification and output stability. This invention plays a crucial role in the technological development of thermal storage tanks for fusion reactors.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A thermal performance testing system for an intermittent heat source storage tank of a fusion device includes a storage tank operation system simulating the operation of a fusion device's heat storage system, an auxiliary heating system for heating the storage tank operation system, and a test control system. The storage tank operation system includes a first test tank, a second test tank, a heat source simulation electric heater, a first pump, a second pump, a first valve, and a second valve. The inlet of the first test tank is connected to the outlet of the heat source simulation electric heater, the inlet of the heat source simulation electric heater is connected to the outlet of the first pump, the inlet of the first pump is connected to the outlet of the second test tank via the first valve, and the inlet of the second test tank is connected to the outlet of the second pump. The inlet of the second pump is connected to the outlet of the first test tank via a second valve; the auxiliary heating system includes tank heaters and tank electric heat tracing respectively located inside and on the side walls of the first and second test tanks, as well as pipe electric heat tracing located on the outer surface of the connecting pipes; the test control system includes multiple test tank temperature test groups respectively located inside the first and second test tanks, multiple thermocouples located at the outlets and pipes of the first and second test tanks, a mass flow meter located on the circulation pipe between the first and second test tanks, a level gauge located on the first and second test tanks, and a PLC controller.

[0009] This invention also provides a method for testing the thermal performance of an intermittent heat source storage tank for a fusion device, employing the aforementioned thermal performance testing system for an intermittent heat source storage tank for a fusion device, comprising:

[0010] Molten salt is filled into the second test tank. The first test tank, the second test tank, and the pipeline are heated to the lower limit of the heat storage temperature of the fusion device's heat storage system through the auxiliary heating system. The first pump and the first valve are started to allow molten salt to flow into the first test tank to the set liquid level, and then the auxiliary heating system is turned off.

[0011] During the thermal performance test of the cryogenic thermal storage tank, the second pump and the second valve are turned on, and the openings of the first and second valves are adjusted so that molten salt flows from the second test tank to the first test tank via a heat source simulating an electric heater at a set mass flow rate, while simultaneously flowing back from the first test tank to the second test tank, continuously operating for a thermal storage time t1; t1 is the thermal storage time of the fusion device's thermal storage system; then the first pump and the first valve are turned off, maintaining only the molten salt flowing back from the first test tank to the second test tank, continuously operating for a heat release time t2; t2 is the duration of heat release by the fusion device's thermal storage system alone; during t1 and t2, the corresponding internal temperature distribution and outlet temperature data of the second test tank are continuously collected;

[0012] During the thermal performance test of the high-temperature thermal storage tank, the auxiliary heating system is turned on. When the temperature of all temperature measuring points in the first test tank reaches the upper limit of the thermal storage temperature of the fusion device's thermal storage system, and the temperature of all temperature measuring points in the second test tank reaches the lower limit of the thermal storage temperature of the fusion device's thermal storage system, the second pump and the second valve are turned on. At the same time, the opening of the first valve and the second valve are adjusted so that molten salt flows from the outlet of the second test tank into the inlet of the first test tank at a set mass flow rate, and from the outlet of the first test tank into the inlet of the second test tank. Simultaneously, the heat source simulates an electric heater and runs continuously for thermal storage time t1. Then, the first valve and the first pump are turned off, and only the molten salt flows from the first test tank back to the second test tank, and runs continuously for heat release time t2. During t1 and t2, the internal temperature distribution and outlet temperature data of the first test tank are continuously collected.

[0013] Beneficial effects:

[0014] 1. This invention proposes for the first time a test method for the thermal performance of thermal storage tanks under intermittent heat source conditions in fusion reactors, filling the gap in the current lack of test systems and methods for thermal performance of thermal storage tanks under intermittent heat source conditions. It realizes the test of the internal medium temperature distribution and output temperature distribution law of high and low temperature thermal storage tanks under the action of intermittent heat source, which can be used to evaluate the internal thermal stratification and heat output stability of thermal storage tanks, and is of great significance for the design of high-efficiency thermal storage tanks.

[0015] 2. This invention, by setting up a multi-dimensional (vertical / horizontal) dense temperature measurement array inside the high and low temperature thermal storage tank and combining it with real-time monitoring of multiple parameters such as mass flow rate and liquid level, can obtain dynamic thermal response data of the thermal storage tank during the entire charging / discharging process with high precision, providing reliable experimental basis for the structural design and operation strategy formulation of high-efficiency thermal storage tanks.

[0016] 3. This invention adopts a strategy of separate testing and independent temperature control for high and low temperature thermal storage tanks, which avoids the energy consumption and process complexity of traditional solutions where high-temperature molten salt needs to be forcibly cooled before being used for testing of low-temperature thermal storage tanks. At the same time, the waste heat from the high-temperature thermal storage tank test can be directly used to preheat the medium in the low-temperature thermal storage tank, which significantly reduces the energy consumption of auxiliary heating and cooling and improves the system energy efficiency.

[0017] 4. This invention adopts a PLC-based integrated control system, which realizes automatic and precise control of the entire cycle of heat source simulation, fluid transportation, valve switching, heat tracing maintenance and data acquisition, ensuring the repeatability and data reliability of the intermittent cycle test process, and effectively restoring the actual operating conditions of fusion and energy storage. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of a thermal performance testing system for an intermittent heat source storage tank of a fusion device according to the present invention.

[0019] The attached figures are labeled as follows: 1-Heat storage tank operating system, 11-First test tank, 12-Heat source simulation electric heater, 13-First pump, 14-First valve, 15-Second test tank, 16-Second pump, 17-Second valve, 18-Third valve, 19-Third pump, 110-Salt removal equipment, 2-Auxiliary heating system, 21-First tank heater, 22-First tank electric heat tracing, 23-Second tank heater, 24-Second tank electric heat tracing, 25-Pipeline electric heat tracing, 3-Test control... Control system, 31-First thermocouple, 32-Second thermocouple, 33-Third thermocouple, 34-Fourth thermocouple, 35-Fifth thermocouple, 36-Sixth thermocouple, 37-Seventh thermocouple, 38-Eighth thermocouple, 39-Ninth thermocouple, 310-First test tank temperature test group, 311-Second test tank temperature test group, 312-First mass flow meter, 313-Second mass flow meter, 314-First level gauge, 315-Second level gauge, 316-PLC controller. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention. Furthermore, the technical features involved in the various embodiments of this invention described below can be combined with each other as long as they do not conflict with each other.

[0021] like Figure 1As shown, the thermal performance testing system for an intermittent heat source storage tank of a fusion device according to the present invention includes a storage tank operating system 1, an auxiliary heating system 2, and a test control system 3. The auxiliary heating system 2 is connected to the first test tank 11, the second test tank 15, and the pipelines in the storage tank operating system 1, and is used to heat the first test tank 11, the second test tank 15, and the pipelines. The test control system 3 is connected to the storage tank operating system 1 and is used to test the flow rate, temperature, and liquid level of the storage tank operating system 1, and to control and test the opening and adjustment of valves and pumps in the storage tank operating system 1.

[0022] The thermal storage tank operating system 1 includes a first test tank 11, a heat source simulation electric heater 12, a first pump 13, a first valve 14, a second test tank 15, a second pump 16, a second valve 17, a third valve 18, a third pump 19, a desalination device 110, and related pipelines. The inlet of the first test tank 11 is connected to the outlet of the heat source simulation electric heater 12; the inlet of the heat source simulation electric heater 12 is connected to the outlet of the first pump 13; the inlet of the first pump 13 is connected to the outlet of the first valve 14; the inlet of the first valve 14 is connected to the outlet of the second test tank 15; the inlet of the second test tank 15 is connected to the outlet of the second pump 16; the inlet of the second pump 16 is connected to the outlet of the second valve 17; and the inlet of the second valve 17 is connected to the outlet of the first test tank 11. The inlet of the third valve 18 is connected to the drain port of the second test tank 15; the outlet of the third valve 18 is connected to the inlet of the third pump 19; and the outlet of the third pump 19 is connected to the inlet of the desalination device 110.

[0023] The auxiliary heating system 2 includes a first tank heater 21, a first tank electric heat tracing 22, a second tank heater 23, a second tank electric heat tracing 24, and pipeline electric heat tracing 25. The first tank heater 21 is installed from the top of the first test tank 11, extending into the interior of the first test tank 11 to heat the medium from the inside. The first tank electric heat tracing 22 is evenly installed on the outer wall of the first test tank 11 to heat the internal medium from the outside. The second tank heater 23 is installed from the top of the second test tank 15, extending into the interior of the second test tank 15 to heat the medium from the inside. The second tank electric heat tracing 24 is evenly installed on the outer wall of the second test tank 15 to heat the internal medium from the outside. The pipeline electric heat tracing 25 is installed on the outer surface of all pipelines to heat the internal medium of the pipelines.

[0024] The test control system 3 includes a first thermocouple 31, a second thermocouple 32, a third thermocouple 33, a fourth thermocouple 34, a fifth thermocouple 35, a sixth thermocouple 36, a seventh thermocouple 37, an eighth thermocouple 38, a ninth thermocouple 39, a first test tank temperature test group 310, a second test tank temperature test group 311, a first mass flow meter 312, a second mass flow meter 313, a first level gauge 314, a second level gauge 315, and a PLC controller 316. The first thermocouple 31 is located at the outlet of the heat source simulated electric heater 12 and is used to measure the outlet medium temperature of the heat source simulated electric heater 12. The second thermocouple 32 is used to measure the temperature of the first tank heater 21. The third thermocouple 33 is used to measure the temperature of the first tank electric heat tracing 22 on the side wall of the first test tank 11. The fourth thermocouple 34 is installed at the outlet of the first test tank 11 to measure the outlet medium temperature. The fifth thermocouple 35 is installed in the middle of the pipeline between the outlet of the first test tank 11 and the inlet of the second test tank 15 to measure the temperature of the pipeline electric heat tracing 25. The sixth thermocouple 36 is used to measure the temperature of the second tank heater 23. The seventh thermocouple 37 is used to measure the temperature of the second tank electric heat tracing 24 on the side wall of the second test tank 15. The eighth thermocouple 38 is installed in the middle of the pipeline between the outlet of the second test tank 15 and the inlet of the first test tank 11 to measure the temperature of the pipeline electric heat tracing 25. The ninth thermocouple 39 is installed at the outlet of the second test tank 15. The first test tank temperature test group 310 is installed inside the first test tank 11 to measure the temperature distribution of the medium at various points inside the first test tank 11. The second test tank temperature test group 311 is installed inside the second test tank 15 to measure the temperature distribution of the internal medium of the second test tank 15.

[0025] A first mass flow meter 312 is installed on the pipeline between the outlet of the second test tank 15 and the inlet of the first test tank 11, and is used to measure the mass flow rate from the outlet of the second test tank 15 to the inlet of the first test tank 11. A second mass flow meter 313 is installed on the pipeline between the outlet of the first test tank 11 and the inlet of the second test tank 15, and is used to measure the mass flow rate from the outlet of the first test tank 11 to the inlet of the second test tank 15. A first level gauge 314 is installed on the first test tank 11 and is used to measure the liquid level height of the first test tank 11. A second level gauge 315 is installed on the second test tank 15 and is used to measure the liquid level height of the second test tank 15.

[0026] All test data from thermocouples and mass flow meters are fed back to PLC controller 316. PLC controller 316 is used to control the switching of heat source simulated electric heater 12, first pump 13, first valve 14, second pump 16, second valve 17, first tank heater 21, first tank electric heat tracing 22, second tank heater 23, second tank electric heat tracing 24, and pipeline electric heat tracing 25.

[0027] Preferably, the first pump 13 and the second pump 16 are automatic control pumps, which are controlled to start and stop according to the instructions of the PLC controller 316.

[0028] Preferably, the first valve 14 and the second valve 17 are automatic control valves, which control the start and stop of the valves according to the instructions of the PLC controller 316.

[0029] Preferably, both the first test tank temperature test group 310 and the second test tank temperature test group 311 contain at least nine temperature measurement points, which can be measured using thermocouples or fiber optics. Each temperature measurement point includes points on at least three vertical interfaces and three horizontal interfaces. The spacing between the temperature measurement points on each vertical interface is the same. The spacing between the temperature measurement points on each horizontal interface is also the same.

[0030] Preferably, the dimensions of the first test tank 11 and the second test tank 15 are scaled proportionally according to the diameter / height ratio of the actual thermal storage tank, with a scaling ratio of 10 to 20.

[0031] Based on the above-mentioned thermal performance testing system for intermittent heat source storage tanks of fusion devices, the present invention also provides a method for testing the thermal performance of intermittent heat source storage tanks of fusion devices, including:

[0032] 1. Before the thermal performance test begins, molten salt is filled into the second test tank 15. The liquid level is determined based on the actual liquid level dimensions and scaling ratio of the thermal storage tank. Simultaneously, the first tank heater 21, the first tank electric heat tracing 22, the second tank heater 23, the second tank electric heat tracing 24, and the pipeline electric heat tracing 25 are activated via PLC controller 316. The temperature is set to the lower limit Tc of the thermal storage system of the fusion device. The molten salt in the second test tank 15 begins to melt under the combined heating of the second tank heater 23 and the second tank electric heat tracing 24, and the temperature gradually increases. When the temperature at all temperature measuring points in the second test tank temperature test group 311 reaches Tc, the first pump 13 and the first valve 14 are activated, and the molten salt flows out of the second test tank 15 and into the first test tank 11. After reaching the minimum liquid level in the first test tank 11, the first tank heater 21, the first tank electric heat tracing 22, the second tank heater 23, the second tank electric heat tracing 24, and the pipeline electric heat tracing 25 are shut off.

[0033] 2. Conduct thermal performance testing of the cryogenic storage tank. Turn on the second pump 16 and the second valve 17, while simultaneously adjusting the openings of the first valve 14 and the second valve 17, so that the mass flow rate from the outlet of the second test tank 15 to the inlet of the first test tank 11 reaches the set value M1, and the mass flow rate from the outlet of the first test tank 11 to the inlet of the second test tank 15 reaches the set value M2. Molten salt flows out from the outlet of the second test tank 15, sequentially passing through the first valve 14, the first pump 13, the heat source simulated electric heater 12, and the first test tank 11 at a mass flow rate M1. It then flows out from the outlet of the first test tank 11, sequentially passing through the second valve 17 and the second pump 16 at a mass flow rate M2, and then flows back to the second test tank 15. During this time, the heat source simulated electric heater 12 is not activated for heating; it only serves as a channel for molten salt flow. This state is maintained continuously for a duration of t1, where t1 is the heat storage duration of the fusion device's thermal storage system. During this phase, the operating characteristics of the cryogenic thermal storage tanks during fusion reactor operation are simulated. Simultaneously, the outlet temperature T9 of the second test tank temperature test group 311 and the second test tank 15 is continuously collected to obtain the internal temperature distribution and outlet temperature variation patterns of the cryogenic thermal storage tanks during fusion reactor operation. At time t1, the liquid level in the second test tank 15 reaches its lowest point, while the liquid level in the first test tank 11 reaches its highest point. At this time, the first valve 14 and the first pump 13 are closed, and the molten salt stops flowing from the second test tank 15 to the first test tank 11. The molten salt continues to flow from the first test tank 11 back to the second test tank 15 at a mass flow rate M2. This state is maintained continuously for a duration of t2, where t2 is the duration of heat release by the fusion device's thermal storage system alone. At the end of time t2, the liquid level in the second test tank 15 reaches its highest point, and the liquid level in the first test tank 11 reaches its lowest point. This phase simulates the operation of the cryogenic thermal storage tank during the fusion reactor's intermittent operation. Simultaneously, the outlet temperature T9 of the second test tank temperature test group 311 and the second test tank 15 is continuously collected to obtain the temperature distribution pattern inside the cryogenic thermal storage tank and the temperature change pattern of the cryogenic thermal storage tank outlet during the fusion reactor's intermittent operation.

[0034] 3. Conduct thermal performance testing of the high-temperature thermal storage tank. Before starting the thermal performance testing, turn on the first tank heater 21, the first tank electric heat tracing 22, the second tank heater 23, the second tank electric heat tracing 24, and the pipeline electric heat tracing 25. Set the temperatures of the first tank heater 21 and the first tank electric heat tracing 22 to the upper limit value Th of the thermal storage system of the fusion device, and set the temperatures of the second tank heater 23, the second tank electric heat tracing 24, and the pipeline electric heat tracing 25 to the lower limit value Tc of the thermal storage system of the fusion device. When the temperatures at all temperature measuring points in the first test tank temperature test group 310 reach Th and the temperatures at all temperature measuring points in the second test tank temperature test group 311 reach Tc, the thermal performance testing of the high-temperature thermal storage tank begins. The second pump 16 and the second valve 17 are turned on, while the openings of the first valve 14 and the second valve 17 are adjusted to ensure that the mass flow rate from the outlet of the second test tank 15 to the inlet of the first test tank 11 reaches the set value M1, and the mass flow rate from the outlet of the first test tank 11 to the inlet of the second test tank 15 reaches the set value M2. Simultaneously, the heat source simulation electric heater 12 is turned on, and its power is adjusted in real time according to the temperature of the first thermocouple 31 and the flow rate of the first mass flow meter 312 to maintain the outlet temperature T1 of the heat source simulation electric heater 12 at the Th value. Molten salt flows out from the outlet of the second test tank 15, sequentially passing through the first valve 14, the first pump 13, and the control heat source simulation electric heater 12 at a mass flow rate of M1, before flowing into the first test tank 11. It then flows out from the outlet of the first test tank 11, sequentially passing through the second valve 17 and the second pump 16 at a mass flow rate of M2, before flowing back into the second test tank 15. This state is maintained continuously for a duration of t1, where t1 is the heat storage duration of the fusion device's thermal storage system. During this phase, the operating characteristics of the high-temperature thermal storage tank during fusion reactor operation are simulated. Simultaneously, the outlet temperature T4 of the first test tank temperature test group 310 and the first test tank 11 is continuously collected to obtain the internal temperature distribution and outlet temperature variation patterns of the high-temperature thermal storage tank during fusion reactor operation. At time t1, the liquid level in the second test tank 15 reaches its lowest point, and the liquid level in the first test tank 11 reaches its highest point. At this time, the first valve 14 and the first pump 13 are closed, stopping the flow of molten salt from the second test tank 15 to the first test tank 11. The molten salt continues to flow from the first test tank 11 back to the second test tank 15 at a mass flow rate M2. The system is kept in this state for a continuous period of t2, where t2 is the duration of heat release by the thermal storage system of the fusion device alone. During this stage, the operating pattern of the high-temperature thermal storage tank of the thermal storage system of the fusion device is simulated during the fusion reactor intermittent period. At the same time, the outlet temperature T4 of the first test tank temperature test group 310 and the first test tank 11 is continuously collected to obtain the temperature distribution pattern inside the high-temperature thermal storage tank and the temperature change pattern of the outlet temperature of the high-temperature thermal storage tank during the fusion reactor intermittent period.

[0035] 4. When the test is finished, open the third valve 18 and the third pump 19 to discharge the molten salt to the desalination equipment 110.

[0036] Figure 1 In the figure, T2 represents the temperature measured by the second thermocouple 32, T3 represents the temperature measured by the third thermocouple 33, T5 represents the temperature measured by the fifth thermocouple 35, T6 represents the temperature measured by the sixth thermocouple 36, T7 represents the temperature measured by the seventh thermocouple 37, and T8 represents the temperature measured by the eighth thermocouple 38.

[0037] Those skilled in the art will readily understand that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A thermal performance testing system for an intermittent heat source storage tank of a fusion device, characterized in that, The system includes a thermal storage tank operation system simulating the operation of a fusion device's thermal storage system, an auxiliary heating system for heating the thermal storage tank operation system, and a test control system. The thermal storage tank operation system includes a first test tank, a second test tank, a heat source simulated electric heater, a first pump, a second pump, a first valve, and a second valve. The inlet of the first test tank is connected to the outlet of the heat source simulated electric heater, the inlet of the heat source simulated electric heater is connected to the outlet of the first pump, the inlet of the first pump is connected to the outlet of the second test tank through the first valve, the inlet of the second test tank is connected to the outlet of the second pump, and the inlet of the second pump is connected to the outlet of the first test tank through the second valve. The auxiliary heating system includes tank heaters and tank electric heat tracing respectively located inside and on the side walls of the first and second test tanks, as well as pipe electric heat tracing located on the outer surface of the connecting pipes. The test control system includes multiple test tank temperature test groups respectively located inside the first and second test tanks, multiple thermocouples located at the outlets and on the pipes of the first and second test tanks, a mass flow meter located on the circulation pipe between the first and second test tanks, a level gauge located on the first and second test tanks, and a PLC controller.

2. The thermal performance testing system for an intermittent heat source storage tank of a fusion device as described in claim 1, characterized in that, The first and second test tanks are each equipped with a test tank temperature test group containing at least nine temperature measurement points. The temperature measurement points are distributed on three vertical sections and three horizontal sections, and the spacing between the temperature measurement points in each vertical and horizontal section is equal.

3. The thermal performance testing system for an intermittent heat source storage tank of a fusion device as described in claim 1, characterized in that, The first and second pumps are automatically controlled pumps whose start and stop are controlled by a PLC controller.

4. The thermal performance testing system for an intermittent heat source storage tank of a fusion device as described in claim 1, characterized in that, The first and second valves are automatic control valves whose opening and closing are controlled by a PLC controller.

5. The thermal performance testing system for an intermittent heat source storage tank of a fusion device as described in claim 1, characterized in that, The geometric dimensions of the first and second test tanks were obtained by scaling them proportionally according to the ratio of the diameter to the height of the actual thermal storage tank in the fusion device's thermal storage system.

6. A method for testing the thermal performance of an intermittent heat source storage tank for a fusion device, comprising a thermal performance testing system for an intermittent heat source storage tank for a fusion device as described in any one of claims 1 to 5, characterized in that, include: Molten salt is filled into the second test tank. The first test tank, the second test tank, and the pipeline are heated to the lower limit of the heat storage temperature of the fusion device's heat storage system through the auxiliary heating system. The first pump and the first valve are started to allow molten salt to flow into the first test tank to the set liquid level, and then the auxiliary heating system is turned off. During the thermal performance test of the cryogenic thermal storage tank, the second pump and the second valve are turned on, and the openings of the first and second valves are adjusted so that molten salt flows from the second test tank to the first test tank via a heat source simulating an electric heater at a set mass flow rate, while simultaneously flowing back from the first test tank to the second test tank, continuously operating for a thermal storage time t1; t1 is the thermal storage time of the fusion device's thermal storage system; then the first pump and the first valve are turned off, maintaining only the molten salt flowing back from the first test tank to the second test tank, continuously operating for a heat release time t2; t2 is the duration of heat release by the fusion device's thermal storage system alone; during t1 and t2, the corresponding internal temperature distribution and outlet temperature data of the second test tank are continuously collected; During the thermal performance test of the high-temperature thermal storage tank, the auxiliary heating system is turned on. When the temperature of all temperature measuring points in the first test tank reaches the upper limit of the thermal storage temperature of the fusion device's thermal storage system, and the temperature of all temperature measuring points in the second test tank reaches the lower limit of the thermal storage temperature of the fusion device's thermal storage system, the second pump and the second valve are turned on. At the same time, the opening of the first valve and the second valve are adjusted so that molten salt flows from the outlet of the second test tank into the inlet of the first test tank at a set mass flow rate, and from the outlet of the first test tank into the inlet of the second test tank. Simultaneously, the heat source simulates an electric heater and runs continuously for thermal storage time t1. Then, the first valve and the first pump are turned off, and only the molten salt flows from the first test tank back to the second test tank, and runs continuously for heat release time t2. During t1 and t2, the internal temperature distribution and outlet temperature data of the first test tank are continuously collected.

7. The method for testing the thermal performance of an intermittent heat source storage tank in a fusion device as described in claim 6, characterized in that, In the thermal performance test of the low-temperature thermal storage tank, the heat source simulates an electric heater that is not turned on for heating, but only serves as a channel for the flow of molten salt.

8. The method for testing the thermal performance of an intermittent heat source storage tank in a fusion device as described in claim 6, characterized in that, In the thermal performance test of the high-temperature thermal storage tank, the first test tank is heated to the upper limit of the thermal storage temperature of the fusion device thermal storage system by the first tank heater inside and the first tank electric heat tracing on the outer wall of the first tank; the second test tank is maintained at the lower limit of the thermal storage temperature of the fusion device thermal storage system by the second tank heater inside and the second tank electric heat tracing on the outer wall of the second tank.

9. The method for testing the thermal performance of an intermittent heat source storage tank in a fusion device as described in claim 8, characterized in that, During the thermal performance test of the high-temperature thermal storage tank, the heating power of the heat source simulated electric heater is adjusted in real time according to the outlet temperature and inlet mass flow rate of the heat source simulated electric heater in order to maintain the outlet temperature of the heat source simulated electric heater constant at the upper limit of the thermal storage temperature of the fusion device thermal storage system.

10. The method for testing the thermal performance of an intermittent heat source storage tank in a fusion device as described in claim 6, characterized in that, After the test is completed, open the third valve and the third pump connected to the drain port of the second test tank to discharge the molten salt into the desalination equipment.

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