Molten salt reactor nuclear energy system simulation thermal effects test stand

Abstract

The application discloses a molten salt reactor nuclear energy system simulation thermal effect test bed, which comprises a reactor core simulation body, a control and data acquisition system, a natural cooling loop, a heat exchanger experiment loop I, a heat exchanger experiment loop II and a waterway system. The application provides scientific basis for safety evaluation of the reactor system under accident conditions by means of long-term natural circulation process after forced circulation to natural circulation transition of the whole thermal fluid mechanics behavior of the system under transient conditions. The reactor core simulation body is used for heat transfer experiment detection of the heat exchanger and the reactor core under different powers and different flow rates of the heat conducting oil. The temperature change data of the oil inlet and outlet of the heat exchanger under different flow rates of the hot oil after the secondary side circulating water stops circulating are detected. The data acquisition and control system is fully automatically operated, the test repeatability and data reliability are remarkably improved, and basis and support are provided for engineering design, system safety analysis verification and safety review of the thorium-based molten salt reactor.

Description

Technical Field

[0001] This invention relates to the field of thorium-based molten salt reactor thermal fluid and safety verification technology, specifically to a molten salt reactor nuclear energy system simulation thermal effect test bench that uses heat transfer oil as a simulation medium. Background Technology

[0002] Thorium-based molten salt reactors (TMSRs), as one of the fourth-generation advanced nuclear energy systems, have advantages such as high fuel utilization, low radioactive waste, strong non-proliferation capabilities, and high inherent safety. Their core feature is that liquid fuel serves as both fuel carrier and coolant. After the reactor core is heated, the liquid fuel is driven by the main pump to flow through the heat exchanger to complete heat transfer, forming a closed-loop system. The system can operate at a maximum temperature of 700°C and exhibits complex thermo-fluid characteristics such as initial nonlinearity and high dynamic response. The key phenomena and dynamic response characteristics of the system during steady-state and transient processes are not well understood.

[0003] Furthermore, conducting experiments in a real molten salt environment presents numerous technical and safety challenges: First, high-temperature molten salt is extremely corrosive, placing extremely high demands on structural materials; second, molten salt containing nuclear fuel is radioactive, requiring operation under strict shielding and protection conditions, which significantly increases experimental costs and management complexity; and third, molten salt is prone to solidification at low temperatures, making it difficult to control the reactor start-up and shutdown process, and hindering repeated debugging and fault reproduction.

[0004] To overcome the aforementioned limitations, the academic community has widely explored non-nuclear simulation methods to replace real experiments. Current mainstream methods include water / steam systems, liquid metals, and organic heat transfer oils. While water systems are safe and easy to measure, their thermophysical parameters (such as specific heat capacity, viscosity, and density) differ significantly from those of high-humidity molten salts, making effective matching difficult, especially in high-temperature regions. Liquid metals (such as sodium-potassium alloys), while possessing excellent thermal conductivity, have high chemical reactivity, posing risks of combustion and explosion, and are unsuitable for conventional laboratory environments. In contrast, heat transfer oils, as stable organic synthesis media, possess advantages such as good thermal stability, moderate operating temperature (50-300℃), no radioactivity, no corrosiveness, and easy maintenance, making them an ideal low-temperature equivalent simulation medium.

[0005] Therefore, there is an urgent need to construct a comprehensive experimental platform that integrates core heat source simulation, loop circulation control, efficient heat exchange, precise measurement and control, and safety assurance. This platform should be able to directly reflect the thermal response and safety behavior of thorium-based molten salt reactors under different operating conditions. For example, it should address the key safety mechanisms upon which thorium-based molten salt reactors rely, such as the transition from forced circulation to natural circulation (i.e., relying on density difference to drive fluid to continuously cool the core when the main pump fails) and the subsequent long-term natural circulation process. This platform should provide a scientific basis for the safety assessment of the reactor system under accident conditions. It should also include heat exchanger testing, filling the current technological gaps in experimental research. Summary of the Invention

[0006] In view of the above, to achieve the above technical objectives, the following technical solution is adopted: a molten salt reactor nuclear energy system simulated thermal effect test rig, including a reactor core simulator, and further including: a control and data acquisition system, a natural cooling loop, a heat exchanger experimental loop I, a heat exchanger experimental loop II, and a water system. The natural cooling loop includes the reactor core simulator. The oil outlet of the reactor core simulator is sequentially connected to a first valve, a hot oil pump I, and a heat exchanger I via a first pipe. The oil outlet of the heat exchanger I is sequentially connected to a first flow meter, a first flow control valve, and an eleventh valve via a second pipe, and returns to the oil inlet of the reactor core simulator via a return pipe. The heat exchanger experimental loop I includes the reactor core simulator. The oil outlet of the reactor core simulator is sequentially connected to a second valve, a three-way flow control valve, a third valve, and a heat exchanger II via a third pipe. The oil outlet of the reactor core is sequentially connected to the fourth valve, the second flow meter, and the tenth valve, and returns to the oil inlet of the reactor core simulator through a return pipe; the heat exchanger experimental loop II includes a reactor core simulator, and the oil outlet of the reactor core simulator is sequentially connected to the second valve, the three-way flow control valve, the fifth valve, and heat exchanger III through a third pipe, and the oil outlet of heat exchanger III is sequentially connected to the sixth valve, the second flow meter, and the tenth valve, and returns to the oil inlet of the reactor core simulator through a return pipe; the water system includes a water-cooled unit, valves connected to the secondary side inlets and outlets of heat exchangers I, II, and III, and a circulating water pump; the hot oil pump I The oil outlet is connected to the oil inlet of the expansion tank. A vacuum pump is connected to the upper end of the expansion tank, and an expansion tank drain valve is located at the lower end of the expansion tank, connecting to an oil storage tank. An oil outlet pipe at the oil outlet of the oil storage tank connects to the lower end of the oil storage tank. The oil outlet of the oil storage tank is connected to the oil inlet of the reactor core simulator via a ninth valve. The top of the oil storage tank has an air inlet and an oil injection port. The air inlet is connected to an external high-pressure argon gas supply pipeline. The inlets and outlets of the reactor core simulator, heat exchanger I, heat exchanger II, heat exchanger III, and hot oil pump I are all equipped with thermocouples electrically connected to the control and data acquisition system. The secondary side water inlets and outlets of heat exchanger I, heat exchanger II, and heat exchanger III are respectively equipped with thermocouples. The control and data acquisition system is electrically connected to the first flow meter, the second flow meter, the first flow control valve, and the three-way flow control valve. The heat exchanger II... In heat exchanger III, the heat transfer oil flows through the shell side, and the secondary cooling water flows through the tube side; in heat exchanger III, the heat transfer oil flows through the tube side, and the secondary cooling water flows through the shell side.

[0007] Preferably, the reactor core simulator is a structure of multiple parallel heating rods. Each heating rod includes a heating rod shell and a heating wire disposed within the heating rod shell. The heating rod shell is provided with thermocouples at its upper end, middle part, and lower part. The main body of the heating rod is disposed within the cavity of the reactor core simulator. A heating rod connection end is provided at the top of the reactor core simulator. The heating rod connection end is electrically connected to the control and data acquisition system. An oil outlet for connecting pipelines is provided at the upper end of the reactor core simulator cavity, and an oil inlet for connecting pipelines is provided at the lower end of the reactor core simulator cavity.

[0008] Preferably, the heating power of the reactor core simulator ranges from 0 to 100 kW, and the simulated temperature ranges from 50 to 200 °C.

[0009] Preferably, the water-cooled unit includes an insulated water tank, an air-cooled chiller, and a water storage tank. The insulated water tank is equipped with a cold water inlet and a level gauge. The pipes of the insulated water tank are connected to the secondary side outlet of heat exchanger I. The outlet pipe of the insulated water tank is connected to the inlet of the air-cooled chiller. The outlet pipe of the air-cooled chiller is connected to the inlet of the water storage tank. The outlet pipe of the water storage tank is connected to the secondary side inlet of heat exchanger I.

[0010] Preferably, the circulating water pump is located between the outlet of the water storage tank and the secondary side inlet of heat exchanger I, heat exchanger II, and heat exchanger III. The water storage tank is also equipped with a water storage tank level gauge, a water storage tank vent valve, and a water storage tank drain valve.

[0011] Preferably, the high-pressure argon gas supply pipeline is equipped with a valve, the inlet end of the oil storage tank is equipped with a seventh valve, the oil inlet end is equipped with an eighth valve, the bottom of the oil storage tank is also equipped with an oil drain valve, and the oil storage tank is also equipped with a thermocouple, a pressure sensor, a liquid level sensor, and an exhaust valve.

[0012] Preferably, the expansion tank is also equipped with a thermocouple, a liquid level sensor, and a pressure sensor that are electrically connected to the control and data acquisition system.

[0013] Preferably, the control and data acquisition system is used to monitor the operating parameters of the test bench in real time for real-time monitoring and closed-loop control. The control and data acquisition system includes an electrical control cabinet, a computer, and a human-machine interface. The electrical control cabinet is equipped with a PLC, a hot oil pump I drive module, a hot oil pump II drive module, a circulating water pump drive module, a vacuum pump drive module, a temperature sensor interface module, a pressure sensor interface module, a differential pressure sensor interface module, a liquid level sensor interface module, and a core simulator power adjustment module connected to the PLC. The PLC is electrically connected to the computer and the human-machine interface.

[0014] Preferably, the PLC acquires the liquid level signals of the expansion tank, oil tank, heat preservation water tank, and water tank on the test bench through temperature sensors connected to the temperature sensor interface module, and transmits them to the computer. The PLC acquires the pressure signals and differential pressure signals at the corresponding positions on the test bench through pressure sensors and differential pressure sensors connected to the pressure sensor interface module and differential pressure sensor interface module, and transmits them to the computer. The PLC acquires the temperature signals at the corresponding positions on the test bench through temperature sensors connected to the temperature sensor interface module, and transmits them to the computer. The PLC is connected to the core simulator through a core simulator power adjustment module.

[0015] Preferably, filters are installed at the front end of the oil inlet of hot oil pump I and hot oil pump I, the oil outlet of heat exchanger I is higher than the oil outlet of the core simulator, and the outside of the pipes is covered with thermal insulation cotton.

[0016] As can be seen from the above technical solution, the beneficial effects of the present invention are: This invention, through the aforementioned technical solutions, provides a scientific basis for safety assessment under reactor system accident conditions by examining the overall thermo-hydrodynamic behavior of the system under transient conditions, such as the long-term natural circulation process after the transition from forced circulation to natural circulation. It also includes experimental testing of heat exchangers and the reactor core under different power levels and different flow rates of heat transfer oil in a core simulator; and detection of temperature changes at the inlet and outlet of the heat exchanger under different flow rates of hot oil after the secondary circulating water stops circulating. The data acquisition and control system operates fully automatically, significantly improving experimental repeatability and data reliability, and providing a basis and support for the engineering design, system safety analysis and verification, and safety review of thorium-based molten salt reactors. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the core simulation structure of the present invention; Figure 3 This is a schematic diagram of the control and data acquisition system of the present invention. Detailed Implementation

[0018] The following specific examples illustrate the implementation of this application. Those skilled in the art can easily understand other advantages and effects of this application from the content disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. This application can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this application. It should be noted that, in the absence of conflict, the following embodiments and features in the embodiments can be combined with each other. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0019] like Figure 1-3As shown, a molten salt reactor nuclear energy system simulates thermal effects test rig, including a core simulator 20, a control and data acquisition system 10, a natural cooling loop, a heat exchanger experimental loop I, a heat exchanger experimental loop II, and a water system. The natural cooling loop includes the core simulator 20. The oil outlet of the core simulator 20 is sequentially connected via a first pipe 31 to a first valve 51, a hot oil pump I41, and a heat exchanger I71. The oil outlet of the heat exchanger I71 is sequentially connected via a second pipe 32 to a first flow meter 81, a first flow control valve 91, and an eleventh valve 511, and returns to the oil inlet of the core simulator 20 via a return pipe 36. The heat exchanger experimental loop I includes the core simulator 20. The oil outlet of the core simulator 20 is sequentially connected via a third pipe 33 to a second valve 52, a three-way flow control valve 92, a third valve 53, a heat exchanger II 72, and a heat exchanger II 82. The oil outlet of 72 is sequentially connected to the fourth valve 54, the second flow meter 82, and returns to the oil inlet of the core simulator 20 through the return pipe 36; the heat exchanger experimental loop II includes the core simulator 20, the oil outlet of the core simulator 20 is sequentially connected to the second valve 52, the three-way flow control valve 92, the fifth valve 55, and the heat exchanger III 73 through the third pipe 33, and the oil outlet of the heat exchanger III 73 is sequentially connected to the sixth valve 56, the second flow meter 82, and returns to the oil inlet of the core simulator 20 through the return pipe 36; the water system includes a water-cooled unit 300, valves connected to the secondary side inlets and outlets of heat exchangers I 71, II 72, and III 73, and a circulating water pump 43; the hot oil pump I The oil outlet of 41 is connected to the oil inlet of the expansion tank. A vacuum pump 75 is connected to the upper end of the expansion tank 60, and an expansion tank drain valve 601 is located at the lower end of the expansion tank 60 and connected to the oil storage tank 100. The oil outlet pipe at the oil outlet of the oil storage tank 100 connects to the lower end of the interior of the oil storage tank 100. The oil outlet of the oil storage tank 100 is connected to the oil inlet of the core simulator 20 via a ninth valve 509. The top of the oil storage tank 100 has an air inlet and an oil injection port. The air inlet is connected to an external high-pressure argon gas supply pipeline. The oil inlets and outlets of the core simulator 20, heat exchanger I 71, heat exchanger II 72, heat exchanger III 73, and hot oil pump I 41 are all equipped with thermocouples electrically connected to the control and data acquisition system 10. Heat exchanger I 71, heat exchanger II 72, and heat exchanger III 73... The secondary side inlet and outlet of heat exchanger 73 are respectively equipped with thermocouples; the control and data acquisition system 10 is electrically connected to the first flow meter 81, the second flow meter 82, the first flow control valve 91, and the three-way flow control valve 92; in heat exchanger II 72, the heat transfer oil flows through the shell side, and the secondary side cooling water flows through the tube side; in heat exchanger III 73, the heat transfer oil flows through the tube side, and the secondary side cooling water flows through the shell side.The heating power range of the core simulator 20 is 0-100 kW, and the simulated temperature range is 50-200℃.

[0020] like Figure 2 As shown, the reactor core simulator 20 is a structure of multiple parallel heating rods. Each heating rod 200 includes a heating rod shell and a heating wire disposed within the heating rod shell. Thermocouples 202 are provided at the upper end, middle, and lower part of the heating rod shell. The main body of the heating rod is disposed within the cavity of the reactor core simulator 20. A heating rod connection end 201 is provided above the reactor core simulator 20. The heating rod connection end 201 is electrically connected to the reactor core simulator power adjustment module and the temperature sensor interface module of the control and data acquisition system 10. An oil outlet 204 for connecting pipelines is provided at the upper end of the cavity of the reactor core simulator 20, and an oil inlet 203 for connecting pipelines is provided at the lower end of the cavity of the reactor core simulator 20.

[0021] like Figure 1 As shown, the water-cooled unit 300 includes an insulated water tank 301, an air-cooled chiller 302, and a water storage tank 303. The insulated water tank 301 is equipped with a cold water inlet and a level gauge. The pipes of the insulated water tank 301 are connected to the secondary side outlet of the heat exchanger I 71. The outlet pipe of the insulated water tank 301 is connected to the inlet of the air-cooled chiller 302. The outlet pipe of the air-cooled chiller 302 is connected to the inlet of the water storage tank 303. The outlet pipe of the water storage tank 303 is connected to the secondary side inlet of the heat exchanger I 71.

[0022] like Figure 1 As shown, the circulating water pump 43 is located between the outlet of the water storage tank 303 and the secondary side inlet of heat exchanger I 71, heat exchanger II 72, and heat exchanger III 73. The water storage tank 303 is also equipped with a water storage tank level gauge 304, a water storage tank vent valve 305, and a water storage tank drain valve 306.

[0023] like Figure 1 As shown, the argon gas supply pipeline 35 is equipped with a valve, the inlet end of the oil storage tank 100 is equipped with a seventh valve 57, the oil inlet end is equipped with an eighth valve 58, the bottom of the oil storage tank 100 is also equipped with an oil tank drain valve 59, and the oil storage tank 100 is also equipped with a thermocouple, a pressure sensor, a liquid level sensor, and an exhaust valve.

[0024] like Figure 1 As shown, the expansion tank 60 is also equipped with a thermocouple, a liquid level sensor and a pressure sensor connected to the electrical connection control and data acquisition system 10.

[0025] like Figure 1-3As shown, the control and data acquisition system 10 is used to monitor the operating parameters of the test bench in real time for real-time monitoring and closed-loop control. The control and data acquisition system includes an electrical control cabinet, a computer, and a human-machine interface. The electrical control cabinet is equipped with a PLC, a hot oil pump I drive module, a hot oil pump II drive module, a circulating water pump drive module, a vacuum pump drive module, a temperature sensor interface module, a pressure sensor interface module, a differential pressure sensor interface module, a liquid level sensor interface module, and a core simulator power adjustment module connected to the PLC. The PLC is electrically connected to the computer and the human-machine interface.

[0026] like Figure 1-3 As shown, the PLC acquires the liquid level signals of the expansion tank, oil tank, heat preservation water tank, and water tank on the test bench through the temperature sensor connected to the temperature sensor interface module, and transmits them to the computer. The PLC acquires the pressure signal and differential pressure signal at the corresponding position on the test bench through the pressure sensor and differential pressure sensor connected to the pressure sensor interface module and differential pressure sensor, and transmits them to the computer. The PLC acquires the temperature signal at the corresponding position on the test bench through the temperature sensor connected to the temperature sensor interface module, and transmits it to the computer. The PLC is connected to the core simulator through the core simulator power adjustment module.

[0027] like Figure 1-3 As shown, filters are installed at the front end of the oil inlet of hot oil pump I 41 and hot oil pump I 42 respectively, the oil outlet of heat exchanger I 71 is higher than the oil outlet of the core simulator 20, and the outside of the pipes is covered with thermal insulation cotton.

[0028] Preparations before the test experiment Start the control and data acquisition system; System vacuuming: Start vacuum pump 75 to evacuate the oil circuit of the test bench and the oil storage tank 100 and expansion tank 60, that is, to evacuate the natural cooling circuit, heat exchanger test circuit I, heat exchanger test circuit II, oil storage tank 100 and expansion tank 60 to prevent the air trapped in the pipeline from oxidizing the heat transfer oil. Argon and oil injection into the system: Close the expansion tank drain valve 601 and inject oil into the oil storage tank 100 through the eighth valve 58. At the same time, inject argon into the system through the seventh valve 57 to form a protective gas layer. The heat-conducting oil in the oil storage tank 100 is injected into the oil circuit system through high-pressure argon. After the system is filled with oil, close the ninth valve 509. Water system filling: Water is added to the insulated water tank 301 through the water inlet, and then the circulating water pump 43 is turned on to fill the water system; Pre-cooling: Before the test begins, the water is cooled to 20°C using an air-cooled chiller 302 and stored in a water tank 303; Preheating: The heating temperature of the heating rods of the core simulator 20 is adjusted by setting the power of the core simulator power adjustment module through the human-machine interface (touch screen), and the core simulator 20 is turned on to heat up to the preset temperature, such as 70°C, 100°C, 150°C, 200°C. I. Begin the natural circulation characteristic test after the hot oil pump I 41 stops: First, close the secondary side inlet valves corresponding to the second valve 52, the tenth valve 510, heat exchanger II 72, and heat exchanger III 73, and start the hot oil pump I 41 to establish a natural cooling loop. After the temperature collected by the thermocouples at each corresponding point in the natural cooling loop stabilizes, shut down the hot oil pump I 41. The density difference between the heating section of the core simulator 20 and the cooling section (heat trap) of heat exchanger I 71 generates a driving pressure head. For different periods when the hot oil pump I 41 stops, conduct tests and record the effects of different periods of hot oil pump I 41 stoppage on parameters such as the time for establishing the natural circulation and the flow rate of the natural cooling loop, the temperature changes at different positions of the heating rods in the core simulator 20, and the temperature and pressure difference data at the oil inlet and outlet of the core simulator 20, the oil inlet and outlet of the hot oil pump I 41, and the oil inlet and outlet of the heat exchanger I 71. Establish a database. Similarly, the experimental principle for adjusting the core simulator 20 at different power levels and adjusting the natural cooling circuit flow rate by the first flow control valve 91, the shutdown of the hot oil pump I 41, and the natural circulation establishment time are the same as above.

[0029] II. Experiment on heat transfer characteristics of heat exchanger II and core simulator after the heat trap disappears. First, close valves 51, 511, 55, and 56, and start hot oil pump II 42 to establish heat exchanger experimental loop I. Once the temperatures collected by thermocouples at corresponding locations in heat exchanger experimental loop I (temperature changes at different positions of the heating rods inside core simulator 20, oil inlet and outlet of core simulator 20, oil inlet and outlet of hot oil pump II 42, and oil inlet and outlet of heat exchanger II 72) stabilize, close the valve at the secondary side inlet of heat exchanger II 72. With the heat transfer oil flowing through the shell side of heat exchanger II 72, record the temperature changes at different positions of the heating rods inside core simulator 20, the oil inlet and outlet of core simulator 20, the oil inlet and outlet of hot oil pump II 42, and the oil inlet and outlet of heat exchanger II 72, and the changes in parameters such as these parameters at the oil inlet and outlet of core simulator 20, oil inlet and outlet of hot oil pump II 42, and oil inlet and outlet of heat exchanger II 72, for different durations after closing the valve at the secondary side inlet of heat exchanger II 72. 41. Temperature and differential pressure data of oil inlet and outlet, heat exchanger I 71. Establish a database; adjust the core simulator 20 at different power levels and adjust the heat exchanger experimental loop I at different flow rates, and record the temperature changes at different positions of the heating rods in the core simulator 20, oil inlet and outlet, hot oil pump I 41, and heat exchanger I 71.

[0030] III. The heat transfer oil flows through the tube side of heat exchanger III73. After the heat trap disappears, the experimental principle of heat transfer characteristics of heat exchanger III and core simulator is the same as the previous two experiments, and will not be repeated.

[0031] However, the above description is only a preferred embodiment of the present invention and is not intended to limit the patent scope of the present invention. Therefore, all equivalent structural changes made based on the description and drawings of the present invention are similarly included within the scope of the present invention.

Claims

1. A molten salt reactor nuclear energy system simulation thermal effect test rig, comprising a reactor core simulator (20), characterized in that, Also includes: The system includes a control and data acquisition system (10), a natural cooling loop, a heat exchanger experimental loop I, a heat exchanger experimental loop II, and a water system. The natural cooling loop includes a core simulator (20). The oil outlet of the core simulator (20) is connected in sequence to a first valve (51), a hot oil pump I (41), and a heat exchanger I (71) via a first pipe (31). The oil outlet of the heat exchanger I (71) is connected in sequence to a first flow meter (81), a first flow control valve (91), and an eleventh valve (511) via a second pipe (32) and returns to the oil inlet of the core simulator (20) via a return pipe (36). The heat exchanger experimental loop I includes a core simulator (20). The oil outlet of the core simulator (20) is connected in sequence to a second valve (52) and a tee via a third pipe (33). The flow control valve (92), the third valve (53), the heat exchanger II (72), and the oil outlet of the heat exchanger II (72) are sequentially connected to the fourth valve (54), the second flow meter (82), and the tenth valve (510) and return to the oil inlet of the core simulator (20) through the return pipe (36); the heat exchanger experimental loop II includes the core simulator (20), and the oil outlet of the core simulator (20) is sequentially connected to the second valve (52), the three-way flow control valve (92), the fifth valve (55), the heat exchanger III (73), and the oil outlet of the heat exchanger III (73) are sequentially connected to the sixth valve (56), the second flow meter (82), and the tenth valve (510) through the third pipe (33). The meter (82), the tenth valve (510), and return to the oil inlet of the core simulator (20) through the return pipe (36); the water system includes a water-cooled unit (300), valves and circulating water pumps (43) connected to the secondary side inlets and outlets of heat exchangers I (71), II (72), and III (73); the outlet of the hot oil pump I (41) is connected to the inlet of the expansion tank, the upper end of the expansion tank (60) is connected to a vacuum pump (75), the lower end of the expansion tank (60) is provided with an expansion tank drain valve (601) and connected to the oil storage tank (100), and the oil outlet pipe at the outlet of the oil storage tank 100 is connected to the... The oil storage tank 100 is located at the lower end of the interior. The oil outlet of the oil storage tank (100) is connected to the oil inlet of the core simulator (20) through the ninth valve (509). The top of the oil storage tank (100) is provided with an air inlet and an oil injection port. The air inlet is connected to the external high-pressure argon gas supply pipeline. The core simulator (20), heat exchanger I (71), heat exchanger II (72), heat exchanger III (73), and hot oil pump I (41) are all provided with thermocouples electrically connected to the control and data acquisition system (10) at their oil inlets and outlets. The secondary side water inlets and outlets of heat exchanger I (71), heat exchanger II (72), and heat exchanger III (73) are respectively provided with thermocouples.The control and data acquisition system (10) is electrically connected to the first flow meter (81), the second flow meter (82), the first flow control valve (91), and the three-way flow control valve (92); in heat exchanger II (72), the heat transfer oil flows through the shell side, and the secondary cooling water flows through the tube side; in heat exchanger III (73), the heat transfer oil flows through the tube side, and the secondary cooling water flows through the shell side.

2. The molten salt reactor nuclear energy system simulated thermal effect test rig according to claim 1, characterized in that, The core simulator (20) is a structure of multiple parallel heating rods. The heating rod (200) includes a heating rod shell and a heating wire disposed in the heating rod shell. The heating rod shell is provided with thermocouples (202) at the upper end, middle and lower part. The main body of the heating rod is disposed in the cavity of the core simulator (20). The core simulator (20) is provided with a heating rod connection end (201) at the top. The heating rod connection end is electrically connected to the control and data acquisition system (10). The core simulator (20) cavity is provided with an oil outlet (204) for connecting pipelines at the upper end. The core simulator (20) cavity is provided with an oil inlet (203) for connecting pipelines at the lower end.

3. The molten salt reactor nuclear energy system simulated thermal effect test rig according to claim 2, characterized in that, The heating power range of the core simulator (20) is 0-100kw, and the simulated temperature range is 50-200℃.

4. The molten salt reactor nuclear energy system simulated thermal effect test rig according to claim 1, characterized in that, The water-cooled unit (300) includes an insulated water tank (301), an air-cooled chiller (302), and a water storage tank (303). The insulated water tank (301) is equipped with a cold water inlet and a level gauge. The pipe of the insulated water tank (301) is connected to the secondary side outlet of the heat exchanger I (71). The outlet pipe of the insulated water tank (301) is connected to the inlet of the air-cooled chiller (302). The outlet pipe of the air-cooled chiller (302) is connected to the inlet of the water storage tank (303). The outlet pipe of the water storage tank (303) is connected to the secondary side inlet of the heat exchanger I (71).

5. The molten salt reactor nuclear energy system simulated thermal effect test rig according to claim 4, characterized in that, The circulating water pump (43) is located between the outlet of the water storage tank (303) and the secondary side inlet of heat exchanger I (71), heat exchanger II (72) and heat exchanger III (73). The water storage tank (303) is also equipped with a water storage tank level gauge (304), a water storage tank exhaust valve (305) and a water storage tank drain valve (306).

6. The molten salt reactor nuclear energy system simulated thermal effect test rig according to claim 4, characterized in that, The high-pressure argon gas supply pipeline (35) is equipped with a valve. The oil storage tank (100) has a seventh valve (57) at the air inlet end and an eighth valve (58) at the oil inlet end. The bottom of the oil storage tank (100) is also equipped with an oil tank drain valve (59). The oil storage tank (100) is also equipped with a thermocouple, a pressure sensor, a liquid level sensor, and an exhaust valve.

7. The molten salt reactor nuclear energy system simulated thermal effect test rig according to claim 1, characterized in that, The expansion tank (60) is also equipped with thermocouples, level sensors and pressure sensors for the electrical connection control and data acquisition system (10).

8. The molten salt reactor nuclear energy system simulated thermal effect test rig according to claim 1, characterized in that, The control and data acquisition system (10) is used to monitor the operating parameters of the test bench in real time and perform real-time monitoring and closed-loop control. The control and data acquisition system includes an electrical control cabinet, a computer, and a human-machine interface. The electrical control cabinet is equipped with a PLC, a hot oil pump I drive module, a hot oil pump II drive module, a circulating water pump drive module, a vacuum pump drive module, a temperature sensor interface module, a pressure sensor interface module, a differential pressure sensor interface module, a liquid level sensor interface module, and a core simulation body power adjustment module. The PLC is electrically connected to the computer and the human-machine interface.

9. The molten salt reactor nuclear energy system simulated thermal effect test rig according to claim 8, characterized in that, The PLC acquires the liquid level signals of the expansion tank, oil tank, heat preservation water tank, and water tank on the test bench through the temperature sensor connected to the temperature sensor interface module, and transmits them to the computer. The PLC acquires the pressure signal and differential pressure signal at the corresponding position on the test bench through the pressure sensor and differential pressure sensor connected to the pressure sensor interface module and differential pressure sensor, and transmits them to the computer. The PLC acquires the temperature signal at the corresponding position on the test bench through the temperature sensor connected to the temperature sensor interface module, and transmits it to the computer. The PLC is connected to the core simulator through the core simulator power adjustment module.

10. The molten salt reactor nuclear energy system simulated thermal effect test rig according to claim 1, characterized in that, The inlet of hot oil pump I (41) and hot oil pump I (42) are respectively equipped with filters; the outlet of heat exchanger I (71) is higher than the outlet of the core simulator (20), and the outside of the pipes is covered with insulation cotton.

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