A system and method for testing heat loss in a molten salt thermal storage tank of a fusion device

Abstract

This invention provides a system and method for testing the heat loss of a molten salt thermal storage tank in a fusion device, belonging to the technical field of core equipment performance testing for fusion device energy storage systems. The system includes: the outlet of the molten salt storage equipment is connected sequentially to the inlet of the molten salt thermal storage tank via a first pump and a first valve; the outlet of the molten salt thermal storage tank is connected sequentially to the inlet of the molten salt storage equipment via a second pump and a second valve; a heater for the molten salt thermal storage tank is located inside the molten salt thermal storage tank; a heater for the molten salt storage equipment is located inside the molten salt storage equipment; electric heat tracing is applied to the outer surface of the connecting pipes; a level gauge is installed on the side wall of the molten salt thermal storage tank; and multiple temperature measuring points are respectively arranged inside the molten salt thermal storage tank, on the side wall of the insulation layer, and on the outer surface of the top and bottom insulation structures of the insulation layer. This invention can improve the heat storage efficiency of the thermal storage tank in a fusion device.

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 heat loss testing system and method for molten salt thermal 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 testing 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] Molten salt thermal storage tanks are core equipment in existing fusion reactor thermal storage systems. During fusion reactor operation, some of the heat is transferred to molten salt and stored in the molten salt thermal storage tanks. During fusion reactor shutdowns, the high-temperature molten salt is used to supply heat to the outside. Molten salt thermal storage tanks for fusion reactors have significant characteristics such as high thermal storage temperature and large thermal storage capacity. Their heat loss characteristics are particularly significant under high temperature and large capacity conditions, directly affecting the total amount of heat lost by the storage tank and the thermal storage efficiency of the system.

[0004] Currently, existing technologies mainly focus on the anti-condensation heat demand of thermal storage tanks, the mass and heat transfer process, and the energy storage test simulation of molten salt, without paying attention to the heat loss performance testing of molten salt thermal storage tanks. Examples include Chinese patent applications CN202510788075.9 (A method for predicting the anti-condensation heat demand of molten salt storage tanks based on physical information neural networks), CN201610120525.8 (Experimental device and test method for heat and mass transfer process of floating roof crude oil storage tanks), CN202111372371.9 (A high-temperature chloride salt photothermal and energy storage cycle simulation test platform and test method), and CN202111329333.5 (A high-temperature photothermal cycle simulation test platform and test method for binary chloride salts), etc.

[0005] Therefore, since the molten salt thermal storage tank is the core equipment of the fusion reactor thermal storage system, its heat loss characteristics directly affect the efficiency of the entire thermal storage system and the power generation of the power generation system. At present, the industry's focus is mostly on the airtightness test and mechanical performance test of the thermal storage tank. The thermal loss performance test device and test method of the molten salt thermal storage tank are still lacking. There is an urgent need for a test system and corresponding test method that can simulate the thermal loss of the thermal storage tank, which can provide reliable experimental basis and data support for the design optimization and operation strategy formulation of the fusion reactor thermal storage system. Summary of the Invention

[0006] To address the limitation of existing technologies in testing the heat loss of molten salt thermal storage tanks, a core component of fusion reactor thermal storage systems, this invention provides a system and method for testing the heat loss of molten salt thermal storage tanks in fusion devices. This system measures the heat loss of the thermal storage tanks used in fusion reactors, obtains the heat loss patterns of each wall surface during the operating cycle, and evaluates the heat loss characteristics of each insulation layer. It can be used to test the heat loss parameters of molten salt thermal storage tanks at different liquid levels and temperatures, and to assess the heat loss of each wall surface. This allows for targeted optimization of the external insulation structure of the thermal storage tank, playing a crucial role in improving the thermal storage efficiency of fusion device thermal storage tanks.

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

[0008] A heat loss testing system for a molten salt storage tank in a fusion device includes a molten salt storage tank, a molten salt storage device, a first pump, a second pump, a first valve, a second valve, a heater for the molten salt storage tank, a heater for the molten salt storage device, an electric heat tracing system for pipelines, a level gauge, multiple sets of temperature measuring points, an ambient thermometer, and an ambient anemometer. The outlet of the molten salt storage device is connected sequentially to the inlet of the molten salt storage tank via the first pump and the first valve, and the outlet of the molten salt storage tank is connected sequentially to the inlet of the molten salt storage device via the second pump and the second valve. The heater for the molten salt storage tank is equipped with... Inside the molten salt thermal storage tank, the heater for the molten salt storage equipment is located inside the molten salt storage equipment; electric heat tracing is applied to the outer surface of the connecting pipes; a level gauge is installed on the side wall of the molten salt thermal storage tank; multiple sets of temperature measuring points are respectively arranged inside the molten salt thermal storage tank, on the side wall of the insulation layer, and on the outer surface of the top and bottom insulation structures of the insulation layer; at different liquid levels and temperatures, the temperature inside the molten salt thermal storage tank and various parts of the insulation layer are monitored using multiple sets of temperature measuring points, and the heat loss and heat loss per unit area of ​​the side wall, top, and bottom of the molten salt thermal storage tank are calculated and evaluated respectively.

[0009] This invention also provides a method for testing the heat loss of a molten salt thermal storage tank in a fusion device, using the aforementioned heat loss testing system for a molten salt thermal storage tank in a fusion device, comprising:

[0010] Molten salt is placed in a molten salt storage device, heated to the lower limit of the fusion reactor thermal storage temperature, and then transported to a molten salt thermal storage tank to the set liquid level;

[0011] After heating the molten salt to the target test temperature, stop heating and record the temperature of each measuring point inside the molten salt heat storage tank, the side wall of the insulation layer, the top of the insulation layer, the bottom of the insulation structure, and the ambient temperature. Continue for one operating cycle. Repeat the heating and recording process at high, medium, and low liquid levels.

[0012] Calculate the total heat loss, sidewall heat loss, top heat loss, and bottom heat loss of the molten salt thermal storage tank at each moment within an operating cycle. Obtain data on the changes of various heat losses of the molten salt thermal storage tank over time to evaluate the magnitude of heat loss in the molten salt thermal storage tank.

[0013] Beneficial effects:

[0014] 1. This invention provides for the first time a complete heat loss testing system and method applicable to high-temperature molten salt thermal storage tanks for fusion reactors, solving the industry's lack of verification of the thermal performance of this core equipment.

[0015] 2. This invention allows for flexible setting of different heat storage temperatures (including upper and lower limits) and different liquid levels (high, medium, and low), comprehensively acquiring heat loss characteristic data of the heat storage tank under typical operating conditions, providing a basis for system design and operation strategy optimization.

[0016] 3. By deploying a dense set of temperature measuring points inside the heat storage tank and at key locations in the insulation layer, this invention can calculate the heat loss at the top, side walls, and bottom, as well as the heat flux density per unit area, thereby accurately identifying weak insulation areas and guiding targeted optimization of the insulation structure.

[0017] 4. The testing process of this invention can reasonably arrange the order of temperature and liquid level (prioritizing low temperature testing) to reduce unnecessary heating energy consumption; at the same time, high-frequency data acquisition (≤1 minute interval) is used to cover the entire operation cycle to ensure data representativeness and analysis accuracy.

[0018] 5. The heat loss law obtained by this invention can be directly used to improve the insulation design of thermal storage tanks, reduce ineffective heat dissipation, and thus improve the overall thermal efficiency and economy of fusion reactor energy storage systems. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of a heat loss testing system for a molten salt thermal storage tank in a fusion device according to the present invention.

[0020] The attached figures are labeled as follows: 1-molten salt thermal storage tank, 2-molten salt storage equipment, 3-first pump, 4-first valve, 5-second pump, 6-second valve, 7-molten salt thermal storage tank heater, 8-molten salt storage equipment heater, 9-pipeline electric heat tracing, 10-level gauge, 11-temperature measuring point group inside the molten salt thermal storage tank, 12-temperature measuring point group on the side wall of the insulation layer of the molten salt thermal storage tank, 13-temperature measuring point group on the top of the insulation layer of the molten salt thermal storage tank, 14-temperature measuring point group on the bottom of the insulation layer of the molten salt thermal storage tank, 15-external insulation layer of the molten salt thermal storage tank, 16-bottom insulation structure of the molten salt thermal storage tank, 17-first thermocouple, 18-ambient thermometer, 19-ambient anemometer. Detailed Implementation

[0021] 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.

[0022] like Figure 1 As shown, a heat loss testing system for a fusion device molten salt thermal storage tank according to the present invention includes a molten salt thermal storage tank 1, a molten salt storage device 2, a first pump 3, a first valve 4, a second pump 5, a second valve 6, a molten salt thermal storage tank heater 7, a molten salt storage device heater 8, a pipeline electric heat tracing 9, a level gauge 10, a set of internal temperature measuring points 11 for the molten salt thermal storage tank, a set of temperature measuring points 12 for the side wall of the insulation layer of the molten salt thermal storage tank, a set of temperature measuring points 13 for the top of the insulation layer of the molten salt thermal storage tank, a set of temperature measuring points 14 for the bottom of the insulation layer of the molten salt thermal storage tank, an external insulation layer of the molten salt thermal storage tank 15, a bottom insulation structure of the molten salt thermal storage tank 16, a first thermocouple 17, an ambient thermometer 18, and an ambient anemometer 19.

[0023] The outlet of the molten salt storage device 2 is connected to the inlet of the first pump 3, the outlet of the first pump 3 is connected to the inlet of the first valve 4, the outlet of the first valve 4 is connected to the inlet of the molten salt storage tank 1, the outlet of the molten salt storage tank 1 is connected to the inlet of the second pump 5, the outlet of the second pump 5 is connected to the inlet of the second valve 6, and the outlet of the second valve 6 is connected to the inlet of the molten salt storage device 2. The molten salt storage tank heater 7 is installed inside the molten salt storage tank 1 to heat the molten salt inside. Preferably, at least one molten salt storage device heater 8 is installed inside the molten salt storage device 2 to preheat the molten salt. Pipeline electric heating 9 is installed on the outer surface of all pipes to heat the pipes and prevent the molten salt from solidifying. A level gauge 10 is installed on the side wall of the molten salt storage tank 1 to measure the liquid level in the molten salt storage tank 1.

[0024] Temperature measuring point group 11 inside the molten salt thermal storage tank 1 is arranged inside the molten salt thermal storage tank 1, and the group includes at least 9 measuring points to test the temperature on at least 3 horizontal sections and 3 vertical sections. Temperature measuring point group 12 on the side wall of the insulation layer of the molten salt thermal storage tank 1 is arranged on the side wall of the insulation layer, and includes at least 9 measuring points to test the temperature on at least 3 horizontal sections and 3 vertical sections. Temperature measuring point group 13 on the top surface of the insulation layer of the molten salt thermal storage tank 1 is arranged on the top surface of the insulation layer, and includes at least 4 measuring points evenly distributed on the top. Temperature measuring point group 14 on the outer surface of the bottom insulation structure 16 of the molten salt thermal storage tank is arranged on the bottom surface of the insulation layer, and includes at least 5 measuring points.

[0025] An external insulation layer 15 is installed on the side wall and top of the molten salt thermal storage tank 1. A bottom insulation structure 16 is installed at the bottom of the thermal storage tank. A first thermocouple 17 is installed in the molten salt storage device 2 to measure the temperature of the molten salt in the molten salt storage device 2. An ambient thermometer 18 and an ambient anemometer 19 are installed near the molten salt thermal storage tank 1 at a location that does not affect the temperature and wind speed measurement, to measure the temperature and wind speed of the surrounding environment.

[0026] Based on the above-mentioned fusion device molten salt thermal storage tank heat loss testing system, the present invention also provides a method for testing the heat loss of a fusion device molten salt thermal storage tank, including:

[0027] 1. Molten salt is placed inside molten salt storage device 2. Before the heat loss test begins, turn on the molten salt storage device heater 8, pipeline electric heat tracing 9, and molten salt heat storage tank heater 7, and set the heating temperature to the lower limit Tc of the fusion reactor heat storage system. When the molten salt inside molten salt storage device 2 melts and the temperature T1 reaches the lower limit Tc of the fusion reactor heat storage system, turn on the first pump 3 and the first valve 4. Molten salt is transported from molten salt storage device 2 to molten salt heat storage tank 1 until the liquid level L1 inside molten salt heat storage tank 1 reaches the highest liquid level. Then turn off the first pump 3, the first valve 4, the molten salt storage device heater 8, and the pipeline electric heat tracing 9.

[0028] 2. Set the temperature of the molten salt thermal storage tank heater 7 to the target test temperature Tv. When the temperature of all temperature measuring points in the temperature measuring point group 11 inside the molten salt thermal storage tank reaches the set threshold Ta, stop the molten salt thermal storage tank heater 7 and start the heat loss test:

[0029] 1) Heat loss test of high-level thermal storage tank:

[0030] Record the temperature data of all temperature measurement points, including group 11 inside the molten salt thermal storage tank, group 12 on the side wall of the insulation layer of the molten salt thermal storage tank, group 13 on the top of the insulation layer of the molten salt thermal storage tank, and group 14 at the bottom of the insulation layer of the molten salt thermal storage tank. At the same time, record the ambient temperature T0. The recording time interval shall not be longer than 1 minute, and the recording duration shall be one operating cycle time tc of the fusion reactor thermal storage system.

[0031] 2) Heat loss test of medium-level thermal storage tank:

[0032] Open the second pump 5 and the second valve 6 to transport the molten salt in the molten salt storage tank 1 to the molten salt storage equipment 2 until the liquid level in the molten salt storage tank 1 reaches the midpoint between the highest and lowest liquid levels. Then, close the second pump 5 and the second valve 6. Turn on the molten salt storage tank heater 7. When the temperature at all temperature measuring points in the temperature measuring point group 11 inside the molten salt storage tank reaches the target test temperature Tv, stop the molten salt storage tank heater 7 and begin the heat loss test.

[0033] Record the temperature data of all temperature measurement points, including group 11 inside the molten salt thermal storage tank, group 12 on the side wall of the insulation layer of the molten salt thermal storage tank, group 13 on the top of the insulation layer of the molten salt thermal storage tank, and group 14 at the bottom of the insulation layer of the molten salt thermal storage tank. At the same time, record the ambient temperature T0. The recording time interval shall not be longer than 1 minute, and the recording duration shall be one operating cycle time tc of the fusion reactor thermal storage system.

[0034] 3) Heat loss test of low-level thermal storage tank:

[0035] Open the second pump 5 and the second valve 6 to transport the molten salt in the molten salt storage tank 1 to the molten salt storage equipment 2 until the liquid level in the molten salt storage tank 1 reaches the minimum level. Then close the second pump 5 and the second valve 6. Turn on the molten salt storage tank heater 7. When the temperature of all temperature measuring points in the temperature measuring point group 11 inside the molten salt storage tank reaches the target test temperature Tv, stop the molten salt storage tank heater 7 and start the heat loss test.

[0036] Record the temperature data of all temperature measurement points, including group 11 inside the molten salt thermal storage tank, group 12 on the side wall of the insulation layer of the molten salt thermal storage tank, group 13 on the top of the insulation layer of the molten salt thermal storage tank, and group 14 at the bottom of the insulation layer of the molten salt thermal storage tank. At the same time, record the ambient temperature T0. The recording time interval shall not be longer than 1 minute, and the recording duration shall be one operating cycle time tc of the fusion reactor thermal storage system.

[0037] The target test temperature Tv includes at least the lower limit of the fusion reactor thermal storage temperature and the upper limit of the fusion reactor thermal storage temperature. Priority is given to conducting heat loss tests at lower target test temperatures, and the heat loss is evaluated based on the test temperature of the thermal storage tank.

[0038] In the above-mentioned test method for heat loss of molten salt thermal storage tank in fusion devices, the calculation method for heat loss of molten salt thermal storage tank is as follows:

[0039] The average values ​​of the data from the temperature measurement points 11 inside the molten salt thermal storage tank, the temperature measurement points 12 on the side wall of the insulation layer of the molten salt thermal storage tank, the temperature measurement points 13 on the top of the insulation layer of the molten salt thermal storage tank, and the temperature measurement points 14 at the bottom of the insulation layer of the molten salt thermal storage tank are taken respectively.

[0040] Temperature at each measuring point i in the molten salt thermal storage tank internal temperature measuring point group 11 at the same time average for:

[0041] ;

[0042] in, This indicates the total number of temperature measuring points in temperature measuring point group 11 inside the molten salt thermal storage tank, where i represents the temperature measuring point number.

[0043] Temperature at each of the 12 temperature measuring points on the side wall of the insulation layer of the molten salt thermal storage tank at the same time average for:

[0044] ;

[0045] Wherein, n2 represents the total number of temperature measuring points in the temperature measuring point group 12 on the side wall of the insulation layer of the molten salt thermal storage tank.

[0046] Temperature at each of the 13 temperature measuring points on the top of the insulation layer of the molten salt thermal storage tank at the same time average for:

[0047] ;

[0048] Wherein, n3 represents the total number of temperature measuring points in the temperature measuring point group 13 at the top of the insulation layer of the molten salt thermal storage tank.

[0049] Temperature at each of the 14 temperature measuring points at the bottom of the insulation layer of the molten salt thermal storage tank at the same time average for:

[0050] ;

[0051] Wherein, n4 represents the total number of temperature measuring points in the temperature measuring point group 14 at the bottom of the insulation layer of the molten salt thermal storage tank.

[0052] Total heat loss of molten salt thermal storage tank 1 at time j for:

[0053] ;

[0054] in, Let J be the specific heat capacity at the average temperature at time j and time j-1. The mass of molten salt in molten salt storage tank 1. Let j be the average temperature of the temperature measuring point group 11 inside the molten salt thermal storage tank at time j. The average temperature of the temperature measuring point group 11 inside the molten salt thermal storage tank at time j-1.

[0055] Heat loss per unit area of ​​molten salt thermal storage tank 1 at time j for:

[0056] ;

[0057] Heat loss of side wall of molten salt thermal storage tank at time j for:

[0058] ;

[0059] Heat loss per unit area of ​​side wall of molten salt thermal storage tank 1 at time j for:

[0060] ;

[0061] Heat loss at time j on the top surface of molten salt thermal storage tank 1 for:

[0062] ;

[0063] Heat loss per unit area on the top surface of molten salt thermal storage tank 1 at time j for:

[0064] ;

[0065] In the above formulas, Let j be the average temperature of the temperature measuring point group 12 on the side wall of the insulation layer of the molten salt thermal storage tank at time j. Let j be the average temperature of the temperature measuring point group 13 at the top of the insulation layer of the molten salt thermal storage tank. Let be the area of ​​the side wall of the molten salt thermal storage tank. Let be the area of ​​the top surface of the molten salt thermal storage tank. Let j be the ambient temperature at time j. The outer surface area of ​​the molten salt thermal storage tank. This is the heat transfer coefficient between the side wall of the molten salt thermal storage tank and the surrounding environment. The heat transfer coefficient between the top surface of molten salt storage tank 1 and the surrounding environment.

[0066] The heat transfer coefficient between the side wall of molten salt thermal storage tank 1 and the surrounding environment for:

[0067] ;

[0068] The heat transfer coefficient between the top surface of molten salt thermal storage tank 1 and the surrounding environment for:

[0069] ;

[0070] In the above formulas, The wind speed in the surrounding environment is obtained from the environmental anemometer 19. Infrared emissivity of the tank wall; This represents the Stefan-Boltzmann constant. Equivalent sky temperature.

[0071] Heat loss at time j of the bottom surface of molten salt thermal storage tank 1 for:

[0072] ;

[0073] Heat loss per unit area of ​​the bottom surface of molten salt thermal storage tank 1 at time j for:

[0074] ;

[0075] In the formula, This represents the area of ​​the bottom wall of the molten salt thermal storage tank.

[0076] By calculating the total heat loss, sidewall heat loss, top heat loss, and bottom heat loss of the molten salt thermal storage tank at various times during an operating cycle, data on the changes of various heat losses of the molten salt thermal storage tank over time can be obtained, which can be used to assess the magnitude of its heat loss.

[0077] 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 heat loss testing system for a molten salt thermal storage tank in a fusion device, characterized in that, The system includes a molten salt thermal storage tank, molten salt storage equipment, a first pump, a second pump, a first valve, a second valve, a heater for the molten salt thermal storage tank, a heater for the molten salt storage equipment, electric heat tracing for pipelines, a level gauge, multiple sets of temperature measuring points, an ambient thermometer, and an ambient anemometer. The outlet of the molten salt storage equipment is connected sequentially to the inlet of the molten salt thermal storage tank via the first pump and the first valve. The outlet of the molten salt thermal storage tank is connected sequentially to the inlet of the molten salt storage equipment via the second pump and the second valve. The heater for the molten salt thermal storage tank is located inside the molten salt thermal storage tank. The heater is located inside the molten salt storage equipment; electric heat tracing is applied to the outer surface of the connecting pipes; a level gauge is installed on the side wall of the molten salt storage tank; multiple temperature measuring points are respectively arranged inside the molten salt storage tank, on the side wall of the insulation layer, and on the outer surface of the top and bottom insulation structures of the insulation layer; at different liquid levels and temperatures, the temperature inside the molten salt storage tank and various parts of the insulation layer are monitored using multiple temperature measuring points, and the heat loss and heat loss per unit area of ​​the side wall, top, and bottom of the molten salt storage tank are calculated and evaluated based on the monitoring data.

2. The fusion device molten salt thermal storage tank heat loss testing system as described in claim 1, characterized in that, The multiple temperature measurement point groups include the internal temperature measurement point group of the molten salt thermal storage tank, which contains at least 9 temperature measurement points, covering no less than 3 horizontal sections and 3 vertical sections.

3. The fusion device molten salt thermal storage tank heat loss testing system as described in claim 1, characterized in that, The multiple temperature measurement point group includes a temperature measurement point group on the side wall of the insulation layer, which contains at least 9 temperature measurement points, covering no less than 3 horizontal sections and 3 vertical sections; the multiple temperature measurement point group also includes a temperature measurement point group on the top of the insulation layer, which contains at least 4 evenly arranged temperature measurement points; the multiple temperature measurement point group also includes a temperature measurement point group on the outer surface of the bottom insulation structure, which contains at least 5 temperature measurement points.

4. The fusion device molten salt thermal storage tank heat loss testing system as described in claim 1, characterized in that, It also includes a first thermocouple for measuring the temperature of molten salt inside the molten salt storage device.

5. The fusion device molten salt thermal storage tank heat loss testing system as described in claim 1, characterized in that, The ambient thermometer and ambient anemometer are placed around the molten salt thermal storage tank in a location that does not affect the temperature and wind speed measurements.

6. A method for testing the heat loss of a molten salt thermal storage tank in a fusion device, employing the heat loss testing system for a molten salt thermal storage tank in a fusion device as described in any one of claims 1 to 5, characterized in that, include: Molten salt is placed in a molten salt storage device, heated to the lower limit of the fusion reactor thermal storage temperature, and then transported to a molten salt thermal storage tank to the set liquid level; After heating the molten salt to the target test temperature, stop heating and record the temperature of each measuring point inside the molten salt heat storage tank, the side wall of the insulation layer, the top of the insulation layer, the bottom of the insulation structure, and the ambient temperature. Continue for one operating cycle. Repeat the heating and recording process at high, medium, and low liquid levels. Calculate the total heat loss, sidewall heat loss, top heat loss, and bottom heat loss of the molten salt thermal storage tank at each moment within an operating cycle. Obtain data on the changes of various heat losses of the molten salt thermal storage tank over time to evaluate the magnitude of heat loss in the molten salt thermal storage tank.

7. The method for testing heat loss in a molten salt storage tank of a fusion device as described in claim 6, characterized in that, The target test temperature includes at least the lower limit of the fusion reactor thermal storage temperature and the upper limit of the fusion reactor thermal storage temperature.

8. The method for testing heat loss in a molten salt thermal storage tank of a fusion device as described in claim 6, characterized in that, Before each change in liquid level, molten salt in the molten salt storage tank is returned to the molten salt storage equipment via a second pump and a second valve to adjust the liquid level to a medium or low level.

9. The method for testing heat loss in a molten salt thermal storage tank of a fusion device as described in claim 6, characterized in that, The average temperature of each temperature measurement point group at the same time is taken and used for subsequent heat loss calculation.

10. The method for testing heat loss in a molten salt thermal storage tank of a fusion device as described in claim 6, characterized in that, The total heat loss of the molten salt thermal storage tank at each moment is calculated based on the molten salt mass, specific heat capacity, and internal average temperature change rate. The heat loss per unit area of ​​the side wall, top, and bottom is calculated by combining the wall area, ambient temperature, wind speed, and infrared emissivity.

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