Liquid Metal Reactor Thermal Hydraulic Characteristics Experimental System

Abstract

The present disclosure proposes a liquid metal reactor thermal hydraulic characteristics experimental system, including: a main experimental loop, used for conducting a liquid metal reactor thermal hydraulic characteristics experiment, the main experimental loop is approximately rectangular in design, including: a heating section, a first heat exchanger, a buffer tank, an electromagnetic pump and a flow meter, the heating section is located at the bottom of the main experimental loop, and the first heat exchanger is located at the top of the main experimental loop; an oil cooling loop, used to derive the heat generated by the main experimental loop, the oil cooling loop includes: a thermal oil pump, a thermal oil tank, a first heat exchanger, and a second heat exchanger; a water cooling loop, used to derive the heat generated by the oil cooling loop, the water cooling loop includes: a second heat exchanger; an auxiliary gas process system, including: a first inert gas tank, a second inert gas tank, pipelines and valves, the first inert gas tank is connected to the buffer tank and the storage tank respectively, and the second inert gas tank is connected to the thermal oil tank. The system disclosed in the present disclosure can effectively improve the natural circulation capacity based on the approximately rectangular design.

Description

Technical Field

[0001] The present disclosure relates to the technical field of liquid metal reactor thermal hydraulic characteristics experiments, and in particular to a liquid metal reactor thermal hydraulic characteristics experiment system. Background Art

[0002] Liquid metal reactor is a nuclear reactor that uses liquid metal (such as sodium, lead, antimony, etc.) as a working fluid. It has excellent thermal conductivity and high operating temperature, so it is widely used in the field of nuclear energy research. However, there are thermal hydraulic problems in the operation of liquid metal reactors, such as coolant circulation, temperature distribution, flow distribution and other characteristics that need to be fully studied and evaluated.

[0003] In the related art, the natural circulation capacity of the experimental system used in the thermal hydraulic characteristic experiment of the liquid metal reactor is relatively poor. Summary of the invention

[0004] The present disclosure aims to solve one of the technical problems in the related art at least to some extent.

[0005] To this end, the purpose of the present disclosure is to propose a liquid metal reactor thermal hydraulic characteristics experimental system that can effectively improve the natural circulation capacity based on an approximate rectangular design.

[0006] In order to achieve the above-mentioned purpose, the liquid metal reactor thermal hydraulic characteristics experimental system proposed in the first aspect of the present disclosure is characterized by comprising:

[0007] A main experimental loop is used for conducting a liquid metal reactor thermal hydraulic characteristic experiment. The main experimental loop is approximately rectangular in design and comprises: a heating section (1), a first heat exchanger (2), a buffer tank (3), an electromagnetic pump (4) and a flow meter (5). The heating section (1) is located at the bottom of the main experimental loop, and the first heat exchanger (2) is located at the top of the main experimental loop.

[0008] An oil cooling circuit, used for dissipating heat generated by the main experimental circuit, the oil cooling circuit comprising: a heat transfer oil pump (6), a heat transfer oil tank (7), the first heat exchanger (2), and a second heat exchanger (8);

[0009] A water cooling circuit, used for conducting heat generated by the oil cooling circuit, the water cooling circuit comprising: the second heat exchanger (8);

[0010] The auxiliary gas process system comprises: a first inert gas tank (9), a second inert gas tank (10), pipelines and valves, wherein the first inert gas tank (9) is connected to the buffer tank (3) and the storage tank respectively, and the second inert gas tank (10) is connected to the heat transfer oil tank (7).

[0011] In some embodiments of the present disclosure, the heating section (1) is composed of an outer shell and a plurality of fuel rod simulation parts, the simulation parts are arranged in a preset arrangement, the simulation part cable interface and signal acquisition are placed at the bottom, and the simulation part includes an electric heating section and a non-heating section.

[0012] In some embodiments of the present disclosure, the first heat exchanger (2) is a shell and tube structure, with liquid metal flowing in the tubes and secondary side cooling medium heat transfer oil flowing on the shell side.

[0013] In some embodiments of the present disclosure, the first heat exchanger (2) has a first inclination angle so that the liquid metal in the first heat exchanger (2) automatically flows back to the storage tank at the lowest position in the system after the system stops running, and the storage tank is connected to the exhaust gas treatment tank.

[0014] In some embodiments of the present disclosure,

[0015] The buffer tank (3) is used to buffer the volume change of the working fluid in the main experimental loop.

[0016] In some embodiments of the present disclosure,

[0017] The electromagnetic pump (4) is used to drive the working fluid in the main experimental loop to flow and circulate.

[0018] In some embodiments of the present disclosure,

[0019] The flow meter (5) is used to detect the flow of the working fluid in the main experimental loop.

[0020] In some embodiments of the present disclosure, a heating device is disposed outside the main experimental loop, and the heating device is used to maintain the working fluid temperature inside the main experimental loop.

[0021] In some embodiments of the present disclosure, the heat transfer oil in the heat transfer oil tank (7) is heated to a preset temperature before the oil cooling circuit performs cooling treatment, and the preset temperature is related to the melting point temperature of the working fluid in the main experimental circuit.

[0022] In some embodiments of the present disclosure, the system further includes a plurality of state sensing instruments for sensing the system state, and the plurality of state sensing instruments include a temperature measuring instrument and / or a pressure measuring instrument.

[0023] The liquid metal reactor thermal hydraulic characteristics experimental system provided by the present disclosure includes: a main experimental loop, which is used to conduct a liquid metal reactor thermal hydraulic characteristics experiment. The main experimental loop is designed to be approximately rectangular, including: a heating section, a first heat exchanger, a buffer tank, an electromagnetic pump and a flow meter. The heating section is located at the bottom of the main experimental loop, and the first heat exchanger is located at the top of the main experimental loop; an oil cooling loop, which is used to derive the heat generated by the main experimental loop. The oil cooling loop includes: a thermal oil pump, a thermal oil tank, a first heat exchanger, and a second heat exchanger; a water cooling loop, which is used to derive the heat generated by the oil cooling loop, and the water cooling loop includes: a second heat exchanger; an auxiliary gas process system, including: a first inert gas tank, a second inert gas tank, pipelines and valves, the first inert gas tank is connected to the buffer tank and the storage tank respectively, and the second inert gas tank is connected to the thermal oil tank. The system disclosed in the present disclosure can effectively improve the natural circulation capacity based on the approximately rectangular design.

[0024] Additional aspects and advantages of the present disclosure will be given in part in the following description and in part will be obvious from the following description or learned through practice of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The above and / or additional aspects and advantages of the present disclosure will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0026] Figure 1 It is a structural schematic diagram of a liquid metal reactor thermal hydraulic characteristics experimental system proposed in one embodiment of the present disclosure;

[0027] Figure 2 is a cross-sectional schematic diagram of a heating section simulation member and an outer cladding according to the present disclosure;

[0028] Figure 3 is a schematic diagram of the structure of the heating section inlet section proposed in the present disclosure;

[0029] Figure 4 It is a schematic diagram of the structure of an electromagnetic pump proposed in the present disclosure. DETAILED DESCRIPTION

[0030] Embodiments of the present disclosure are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present disclosure, and are not to be construed as limitations of the present disclosure. On the contrary, the embodiments of the present disclosure include all changes, modifications, and equivalents that fall within the spirit and connotation of the appended claims.

[0031] Figure 1 It is a structural schematic diagram of a liquid metal reactor thermal hydraulic characteristics experimental system proposed in one embodiment of the present disclosure.

[0032] like Figure 1 As shown, the liquid metal reactor thermal hydraulic characteristics experimental system includes:

[0033] The main experimental loop is used for conducting a liquid metal reactor thermal hydraulic characteristic experiment. The main experimental loop is designed to be approximately rectangular and comprises: a heating section (1), a first heat exchanger (2), a buffer tank (3), an electromagnetic pump (4) and a flow meter (5). The heating section (1) is located at the bottom of the main experimental loop, and the first heat exchanger (2) is located at the top of the main experimental loop.

[0034] An oil cooling circuit, used for removing heat generated by the main experimental circuit, the oil cooling circuit comprising: a heat transfer oil pump (6), a heat transfer oil tank (7), a first heat exchanger (2), and a second heat exchanger (8);

[0035] A water cooling circuit is used to conduct away the heat generated by the oil cooling circuit, the water cooling circuit comprising: a second heat exchanger (8);

[0036] The auxiliary gas process system comprises: a first inert gas tank (9), a second inert gas tank (10), pipelines and valves, wherein the first inert gas tank (9) is connected to a buffer tank (3) and a storage tank respectively, and the second inert gas tank (10) is connected to a heat transfer oil tank (7).

[0037] That is to say, the liquid metal reactor thermal hydraulic characteristics experimental system proposed in the embodiment of the present disclosure includes, in addition to the main experimental circuit, an oil cooling circuit and a water cooling circuit to timely export the heat generated by the main experimental circuit and improve the stability of the system.

[0038] In the disclosed embodiment, in order to prevent the thermal oil from being oxidized, improve the reliability of the system and extend its service life, an inert gas is introduced into the thermal oil tank for protection.

[0039] The liquid metal reactor thermal hydraulic characteristics experimental system provided by the present disclosure includes: a main experimental loop, which is used to conduct a liquid metal reactor thermal hydraulic characteristics experiment. The main experimental loop is designed to be approximately rectangular, including: a heating section, a first heat exchanger, a buffer tank, an electromagnetic pump and a flow meter. The heating section is located at the bottom of the main experimental loop, and the first heat exchanger is located at the top of the main experimental loop; an oil cooling loop, which is used to derive the heat generated by the main experimental loop. The oil cooling loop includes: a thermal oil pump, a thermal oil tank, a first heat exchanger, and a second heat exchanger; a water cooling loop, which is used to derive the heat generated by the oil cooling loop, and the water cooling loop includes: a second heat exchanger; an auxiliary gas process system, including: a first inert gas tank, a second inert gas tank, pipelines and valves, the first inert gas tank is connected to the buffer tank and the storage tank respectively, and the second inert gas tank is connected to the thermal oil tank. The system disclosed in the present disclosure can effectively improve the natural circulation capacity based on the approximately rectangular design.

[0040] In some embodiments of the present disclosure, the heating section (1) is composed of an outer shell and a plurality of fuel rod simulation parts, the simulation parts are arranged in a preset arrangement, the simulation part cable interface and signal acquisition are placed at the bottom, and the simulation part includes an electric heating section and a non-heating section.

[0041] That is to say, in the embodiment of the present disclosure, before the coolant flows to the electric heating section, a section of fully developed flow can be reserved to ensure that the coolant has reached a stable state under the experimental conditions. It is mainly used to study the heat transfer between the fuel rods and the coolant and the flow resistance performance of the fuel rod bundle under different coolant flow rates, rod diameters, rod spacing, racks or winding structures of liquid metal cooled reactors such as lead-cooled fast reactors.

[0042] For example, Figure 2 and Figure 3 As shown, Figure 2 is a cross-sectional schematic diagram of a heating section simulation member and an external cladding according to the present disclosure, Figure 3 It is a schematic diagram of the structure of the heating section inlet section proposed in the present disclosure.

[0043] In some embodiments of the present disclosure, the first heat exchanger (2) is a shell and tube structure, with liquid metal flowing in the tubes and secondary side cooling medium heat transfer oil flowing on the shell side.

[0044] In some embodiments of the present disclosure, the first heat exchanger (2) has a first inclination angle so that the liquid metal in the first heat exchanger (2) automatically flows back to the lowest storage tank in the system after the system stops running, and the storage tank is connected to the exhaust gas treatment tank.

[0045] That is to say, in the embodiment of the present disclosure, the first heat exchanger (2) can be installed so as to maintain a certain tilt angle as a whole, so as to ensure that after the system stops running, the liquid metals such as lead and bismuth in the heat exchanger can automatically flow back to the lowest storage tank in the system under the action of gravity, so as to effectively improve the natural circulation capacity of the system.

[0046] In the disclosed embodiment, when the storage tank is connected to the tail gas treatment tank, the concentration of liquid metal vapor discharged into the atmosphere from the main experimental loop system can be effectively reduced, thereby improving the environmental friendliness of the system.

[0047] In some embodiments of the present disclosure, the buffer tank (3) is used to buffer the volume change of the working fluid in the main experimental loop.

[0048] It is understandable that when the temperature changes, the volume of the liquid metal may also change, thereby causing the pressure in the main experimental loop to change, affecting the safety of the system. The buffer tank (3) in the embodiment of the present disclosure can be filled with a certain pressure of inert gas from the upper part of its cavity. The inert gas can control the pressure of the buffer tank and then control the pressure of the main experimental loop system, and can also protect the liquid metal working medium of the main experimental loop system, prevent contact with working medium such as air and water, and cause oxidation or even violent chemical reactions, thereby ensuring the safety of system operation.

[0049] In some embodiments of the present disclosure, the electromagnetic pump (4) is used to drive the working fluid in the main experimental loop to flow and circulate.

[0050] Among them, the electromagnetic pump (4) is the core driving component of the flow of the main experimental loop system. It is a three-phase induction type, mainly composed of an inductor coil attached to the outer pipe wall, an inductor core, a built-in core, etc. Its principle is that when the inductor coil is energized, a traveling wave magnetic field will be formed between it and the built-in cylindrical core. This magnetic field induces current in the liquid metal. The induced current interacts with the magnetic field to generate a magnetic field force, thereby generating a pressure difference at the inlet and outlet of the pump to drive the liquid metal to move.

[0051] For example, Figure 4 As shown, Figure 4 It is a schematic diagram of the structure of an electromagnetic pump proposed in the present disclosure.

[0052] In some embodiments of the present disclosure, the flow meter (5) is used to detect the flow of the working fluid in the main experimental loop.

[0053] In the embodiment of the present disclosure, when the flow rate of the working fluid in the main experimental loop is detected based on the flow meter (5), reliable reference information can be provided for the system control process.

[0054] In some embodiments of the present disclosure, a heating device is disposed outside the main experimental loop, and the heating device is used to maintain the working fluid temperature inside the main experimental loop.

[0055] It is understandable that the melting point of the flowing working fluid inside the main experimental loop is usually high, and the working fluid temperature may drop during the experiment. In the embodiment of the present disclosure, when a heating device is configured outside the main experimental loop, the working fluid temperature inside the main experimental loop can be maintained to prevent the working fluid from solidifying due to temperature drop, which can effectively improve the stability of the system.

[0056] In some embodiments of the present disclosure, the heat transfer oil in the heat transfer oil tank (7) is heated to a preset temperature before the oil cooling circuit is cooled, and the preset temperature is related to the melting point temperature of the working fluid in the main experimental circuit.

[0057] It is understandable that the initial temperature of the heat transfer oil in the heat transfer oil tank (7) may be relatively low. If it is directly used for heat exchange with the first heat exchanger (2), it may cause condensation of the liquid metal in the main experimental loop. Therefore, in the embodiment of the present disclosure, the heat transfer oil in the heat transfer oil tank (7) can be heated to a preset temperature before the oil cooling loop is used for cooling, thereby effectively improving the robustness of the system.

[0058] In some embodiments of the present disclosure, the system further includes a plurality of state sensing instruments for sensing the state of the system, and the plurality of state sensing instruments include a temperature measuring instrument and / or a pressure measuring instrument.

[0059] Among them, the temperature measuring instrument is Figure 1 The pressure measuring instrument is marked with T. Figure 1 Marked with P.

[0060] The liquid metal reactor thermal hydraulic characteristics experimental system proposed by the present invention includes at least the following characteristics:

[0061] Functionally, this system can be used to study the thermal-hydraulic characteristics of fuel rods, the natural circulation characteristics of liquid metal reactors, the transition characteristics between forced circulation and natural circulation, the service performance of candidate structural materials, etc.

[0062] Research on thermal hydraulic characteristics of fuel rods. A pressure measurement point is set before and after the heating section of the main experimental loop to measure the pressure change value of the fuel rod simulation and study the key hydraulic laws and characteristics of the liquid metal reactor fuel rod. Several temperature measurement points are set along the axial, radial and axial directions near the wall of the fuel rod simulation to measure the temperature of the liquid metal at the contact with the wall, providing key parameters for calculating the heat transfer coefficient, that is, thermal characteristics research.

[0063] Research on natural circulation characteristics. Natural circulation refers to a phenomenon in which a liquid working medium produces a certain temperature difference under the action of a cold or hot source. Under the action of the temperature difference, the working medium realizes a natural non-active flow. The size of its circulation flow can determine the size of the heat exchange between the heat source and the cold source. The flow rate is determined by factors such as the working medium density, the temperature of the cold or hot source, and the resistance value in the pipeline. Therefore, in order to increase the flow rate and thus improve the natural circulation capacity, the main experimental loop system is set with equipment and structural forms with as low resistance as possible, mainly including: 1. The main experimental loop is designed to be approximately rectangular, reducing the design of high resistance values ​​such as elbows. 2. The power pump adopts a non-contact electromagnetic pump. Compared with conventional mechanical pumps, the electromagnetic pump has a circular flow channel, which can significantly reduce the resistance value. 3. The flow meter is a non-contact measurement design. Compared with invasive measurement methods, it can avoid the problem of increased resistance caused by changes in the flow channel shape. 4. The heating section adopts a design of side entry and upper outflow, which just borrows the rectangular bending structure of the system to further reduce the resistance value.

[0064] Research on the transition characteristics between forced circulation and natural circulation. For liquid metal reactors, forced circulation and natural circulation are two important states, and during the transition process between them, the system will show different characteristics. In order to study the transition process, this system only needs to shut down the electromagnetic pump to observe the changes in the temperature and flow of key components with high precision and high frequency.

[0065] In terms of service performance research of candidate structural materials. Research on candidate structural materials at high temperatures is one of the important contents. In order to study its service characteristics, a material scouring structure is set up in the highest temperature area of ​​the main experimental loop to study the dynamic corrosion performance of the material.

[0066] In terms of experimental methods, it mainly includes three stages: filling of liquid metal before system startup, system performance experiment and liquid metal backflow at the end of the experiment.

[0067] Preparation stage before system startup. For the liquid metal in the storage tank in a molten state, the gas system valve is opened and other operations are performed. Under the pressure of the inert gas on the top of the tank, the pressure is slowly increased to gradually pressurize the liquid metal in the tank into the main experimental loop system. After the system is filled with the main experimental loop system, the valve between the storage tank and the gas tank and the flow meter is closed to meet the conditions for conducting performance experiments.

[0068] System performance test phase. Start the water cooling circuit, oil cooling circuit, and main experimental circuit system in sequence to ensure that the heat in the entire system can be discharged in time. By turning on and off the electromagnetic pump of the main experimental circuit, the pressure, temperature, flow rate and other values ​​before and after the fuel rod, the working fluid flow rate under natural circulation conditions, and the change of transition flow rate can be obtained.

[0069] The experiment ends at the liquid metal reflux stage. At this stage, open the valve between the buffer tank and the gas tank, and the valve between the flow meter and the storage tank. Under the action of gravity, the liquid metal working medium in the main experimental loop system gradually flows back to the lowest point of the system, which is the storage tank. In order to ensure that the system is emptied as much as possible, a certain slope is set in the horizontal section of the rectangular loop system.

[0070] Points to be protected include but are not limited to:

[0071] 1. Through special designs such as heating section and electromagnetic pump, a rectangular flow channel design method is proposed.

[0072] 2. Through the integration of key system equipment, it has the conditions to carry out research on fuel rod heat transfer, natural circulation, and material service performance, forming a set of comprehensive experimental facilities.

[0073] 3. It has the ability to test different forms of fuel rods, heat exchangers and other equipment, and the upstream straight pipe of the heating section can be replaced by an S-shaped pipe. By installing a heating device on the outer wall and increasing the heating capacity, the temperature range of the liquid metal can be further improved, and it has certain expansion capabilities.

[0074] Through the present invention, the key performances of the liquid metal reactor system can be studied at the same time: 1. The heat transfer characteristics and resistance characteristics of the fuel rods under normal operating conditions. 2. The passive core heat removal capability of the system under natural circulation conditions. 3. The state and operation law of the system during the transition from forced circulation conditions to natural circulation conditions. 4. The service performance of the materials used in some structures in the pipeline. The effects are as follows.

[0075] 1. The system adopts an approximately rectangular design to minimize system resistance and obtain the maximum natural circulation flow. It improves the natural circulation capacity and provides basic data and platform for improving the design of liquid metal reactors and improving safety.

[0076] 2. It has the research conditions to observe and study the transition characteristics of forced circulation and natural circulation. The system only needs to turn off the electromagnetic pump under forced circulation conditions to obtain the transition process. Through measuring instruments, important parameters such as flow rate and temperature distribution during the transition process can be obtained. In particular, the system is designed in an approximate rectangular shape to improve the natural circulation capacity of the system after the transition, and the transition process can be observed more clearly.

[0077] 3. It can be used to study the dynamic corrosion performance of candidate materials. The candidate materials are set in the high temperature area, and the corrosion resistance of the materials under high temperature conditions can be studied.

[0078] 4. The system can carry out multiple performance experiments at the same time and is a comprehensive test bench.

[0079] Those skilled in the art will readily appreciate other embodiments of the present disclosure after considering the specification and practicing the invention disclosed herein. The present disclosure is intended to cover any variations, uses, or adaptations of the present disclosure that follow the general principles of the present disclosure and include common knowledge or customary techniques in the art that are not disclosed in the present disclosure. The description and examples are to be considered exemplary only, and the true scope and spirit of the present disclosure are indicated by the following claims.

[0080] It should be understood that the present disclosure is not limited to the exact structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

[0081] It should be noted that, in the description of the present disclosure, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In addition, in the description of the present disclosure, unless otherwise specified, the meaning of "plurality" is two or more.

[0082] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, segment or portion of code that includes one or more executable instructions for implementing the steps of a specific logical function or process, and the scope of the preferred embodiments of the present disclosure includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in the reverse order depending on the functions involved, which should be understood by those skilled in the art to which the embodiments of the present disclosure belong.

[0083] It should be understood that the various parts of the present disclosure can be implemented in hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, multiple steps or methods can be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0084] A person skilled in the art may understand that all or part of the steps in the method for implementing the above-mentioned embodiment may be completed by instructing related hardware through a program, and the program may be stored in a computer-readable storage medium, which, when executed, includes one or a combination of the steps of the method embodiment.

[0085] In addition, each functional unit in each embodiment of the present disclosure may be integrated into a processing module, or each unit may exist physically separately, or two or more units may be integrated into one module. The above-mentioned integrated module may be implemented in the form of hardware or in the form of a software functional module. If the integrated module is implemented in the form of a software functional module and sold or used as an independent product, it may also be stored in a computer-readable storage medium.

[0086] The storage medium mentioned above can be a read-only memory, a magnetic disk or an optical disk, etc.

[0087] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present disclosure. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0088] Although the embodiments of the present disclosure have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present disclosure. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present disclosure.

Claims

1. A liquid metal reactor thermal hydraulic characteristics experimental system, characterized in that: include: A main experimental loop is used for conducting a liquid metal reactor thermal hydraulic characteristic experiment. The main experimental loop is approximately rectangular in design and comprises: a heating section (1), a first heat exchanger (2), a buffer tank (3), an electromagnetic pump (4) and a flow meter (5). The heating section (1) is located at the bottom of the main experimental loop, the first heat exchanger (2) is located at the top of the main experimental loop, and the first heat exchanger (2) has a first inclination angle so that the liquid metal in the first heat exchanger (2) automatically flows back to the lowest storage tank in the system after the system stops running. The storage tank is connected to the tail gas treatment tank. An oil cooling circuit, used for dissipating heat generated by the main experimental circuit, the oil cooling circuit comprising: a heat transfer oil pump (6), a heat transfer oil tank (7), the first heat exchanger (2), and a second heat exchanger (8); A water cooling circuit, used for conducting heat generated by the oil cooling circuit, the water cooling circuit comprising: the second heat exchanger (8); The auxiliary gas process system comprises: a first inert gas tank (9), a second inert gas tank (10), pipelines and valves, wherein the first inert gas tank (9) is connected to the buffer tank (3) and the storage tank respectively, and the second inert gas tank (10) is connected to the heat transfer oil tank (7).

2. The system according to claim 1, characterized in that The heating section (1) is composed of an outer shell and a plurality of fuel rod simulation parts, the simulation parts are arranged in a preset arrangement, the simulation part cable interface and signal acquisition are placed at the bottom, and the simulation part includes an electric heating section and a non-heating section.

3. The system according to claim 1, characterized in that The first heat exchanger (2) is a shell and tube structure, with liquid metal flowing in the tubes and secondary side cooling medium heat transfer oil flowing on the shell side.

4. The system according to claim 1, characterized in that in, The buffer tank (3) is used to buffer the volume change of the working fluid in the main experimental loop.

5. The system according to claim 1, wherein: in, The electromagnetic pump (4) is used to drive the working fluid in the main experimental loop to flow and circulate.

6. The system according to claim 1, wherein: in, The flow meter (5) is used to detect the flow of the working fluid in the main experimental loop.

7. The system according to claim 1, characterized in that in, A heating device is arranged outside the main experimental loop, and the heating device is used to maintain the working medium temperature inside the main experimental loop.

8. The system of claim 1, wherein: in, Before the oil cooling circuit performs cooling treatment, the heat transfer oil in the heat transfer oil tank (7) is heated to a preset temperature, wherein the preset temperature is related to the melting point temperature of the working fluid in the main experimental circuit.

9. The system according to claim 1, characterized in that The system further comprises a plurality of state sensing instruments for sensing the state of the system, wherein the plurality of state sensing instruments comprise a temperature measuring instrument and / or a pressure measuring instrument.

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