Experimental device and method for migration of corrosion products in high-intensity magnetic field environment

Abstract

The invention discloses a strong magnetic field environment corrosion product migration experiment device and method.The strong magnetic field environment corrosion product migration experiment device comprises a superconducting magnet, a water tank, a buffer section, a water pump, a gate valve, a heat transfer pipe experiment section, a measuring instrument and auxiliary equipment; the particle mass difference before and after the experiment is measured, the deposition conditions of the particles at different heat transfer pipe sections are compared, and the influence of the high-intensity magnetic field environment on the migration behavior of the metal corrosion particles in the multi-elbow heat transfer section is analyzed. Aiming at the working condition environment and high-intensity magnetic field characteristics of the fusion reactor, a corrosion particle migration experiment in the multi-elbow heat transfer section is carried out, and the position where the corrosion particles are distributed in the heat transfer pipe in a large number indicates that the corrosion product deposition condition of the heat transfer pipe section in actual engineering needs to be paid attention to; particularly, the radiation dose rate, the material loss and the corrosion condition at the position are monitored.

Description

Technical Field

[0001] The invention relates to the research field of migration and deposition of corrosion products in fusion reactors, and in particular to a corrosion product migration experimental device and method in a strong magnetic field environment. Background Art

[0002] As the ultimate goal of nuclear energy development and application, fusion energy will occupy a core position in the future world energy. There are two main ways to achieve controlled nuclear fusion: inertial confinement fusion and magnetic confinement fusion. The Tokamak device based on the principle of magnetic confinement fusion is one of the fastest-growing and most promising fusion devices. The accident analysis report of the International Thermonuclear Experimental Reactor (ITER) pointed out that ITER has two main safety functions: containing radioactive materials and limiting radioactive irradiation. In fusion reactors using water as coolant, gamma rays from activated corrosion products (ACPs) are the main source of occupational radiation exposure (ORE) for workers. The water in the cooling loop contacts the surface of the system structural material and causes corrosion, producing a large amount of metal oxides and corrosion products (CPs), which are carried to the neutron irradiation area such as the first wall, blanket, divertor and vacuum chamber by the coolant, and then activated by neutron bombardment to generate ACPs. Or the materials in the neutron irradiation area are first activated by neutron bombardment, and then oxidized and corroded in the contact process with the coolant, and are carried and transported by the coolant, so as to be deposited in the heat exchanger, pipe, valve, pump, filter and other parts. In a fusion reactor using water cooling, the activated corrosion products will mainly come from the physical and chemical effects of water and stainless steel, and the ACPs produced are mainly Cr-51, Mn-54, Mn-56, Fe-55, Ni-58, Co-57, Co-58, and Co-60. In addition, the copper alloy in the divertor components will also produce Cu-64, Co-60, Ni-63, Zn-65, Co-58, and Fe-59 when activated by neutrons. ACPs are the key radioactive source items in the radiation safety analysis of the normal operation of the fusion reactor using water as the coolant. Therefore, evaluating the content and distribution of ACPs and CPs has become an important task in the engineering design and operation and maintenance of fusion reactors.

[0003] There are currently no publicly published experimental measurement results for water-cooled fusion reactors. However, for pressurized water reactors, a primary corrosion product deposition mechanism research experimental system has been built to experimentally study the deposition of corrosion products in the main cooling loop. For example, PCCL (PWR Coolant Chemistry Loop) is an experimental loop built at MIT (Massachusetts Institute of Technology). It is based on the temperature, flow state, heat flux density and heat transfer coefficient of the pressurized water reactor, the surface area share of the structural material metal, and the neutron flux density. It is used to simulate the main cooling loop of a typical pressurized water reactor. Although the experience of PWRs can be used as a reference, the two types of reactors have significant differences in terms of average neutron energy, thermal and magnetic field environment, water chemistry, and cooling circuit structure: (1) The average neutron energy of PWRs is 2 MeV, while that of fusion reactors is 14.1 MeV; (2) When the coils of fusion reactors are working normally, the background magnetic field can be as high as 10 T, which will not only exert a strong electromagnetic force on the components of the device, but may also affect the generation of corrosion products of metal materials. PWRs do not require a magnetic field for operation; (3) Due to the high heat load of the blanket, in order to increase the coolant contact area, the cooling circuit will adopt a more curved design. The above differences will result in different characteristics in the generation and deposition behavior of ACPs in the water cooling circuits of PWRs and fusion reactors.

[0004] At present, there are few studies related to the migration and deposition of corrosion products in a water-cooled fusion reactor under a strong magnetic field environment, and the deposition distribution law of corrosion products in the main cooling loop is also unknown. Therefore, it is necessary to design a corrosion product migration experimental device and experimental method suitable for a fusion reactor with a strong magnetic field environment, so that the migration and deposition behavior of corrosion products in the fusion reactor cooling loop can be experimentally studied, and a reliable reference can be provided for the analysis of the mechanism of generation, migration and deposition of corrosion products in a strong magnetic field environment. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides a corrosion product migration experimental device and method in a strong magnetic field environment. The experimental device system is mainly composed of a superconducting magnet, a water tank, a buffer section, a water pump, a gate valve, a heat transfer tube experimental section, measuring instruments and auxiliary equipment. Under the pressure, temperature and magnetic field strength designed based on the working conditions of a fusion reactor, high-purity deionized water and Fe3O4 particles are circulated in an experimental loop for 24 hours, the difference in particle mass before and after the experiment is measured, and the deposition of particles at different heat transfer tube sections is compared to analyze the influence of a strong magnetic field environment on the migration behavior of metal corrosion particles in a multi-bend heat transfer section.

[0006] In order to achieve the above object, the present invention adopts the following technical scheme:

[0007] A corrosion product migration experimental device in a strong magnetic field environment comprises a stirring device, a water tank, deionized water and Fe3O4 particles, a first control switch, a buffer section, a water pump, a gate valve, a pressure gauge, a flow meter, a superconducting magnet, a heat transfer tube experimental section, and a second control switch. Each device and equipment is connected by a 304 stainless steel pipe as a main pipeline; the stirring device and the deionized water and Fe3O4 particles are arranged in the water tank, and the deionized water and Fe3O4 particles circulate in the experimental loop during the experiment; the buffer section is connected to the water tank through a pipeline; the first control switch is arranged in the water tank. The water pump is connected to the buffer section through a pipeline, and the function of the water pump is to pressurize and transport the deionized water, Fe3O4 particles and metal particles; the gate valve and the water pump are connected through a pipeline; the flow meter and the pressure gauge are arranged after the gate valve, and the functions of the flow meter and the pressure gauge are to collect the flow rate and pressure data of the deionized water and Fe3O4 particles respectively; the heat transfer tube experimental section is connected to the gate valve and the water tank through a pipeline; the heat transfer tube experimental section is placed in the superconducting magnet, and the function of the superconducting magnet is to provide the 12 T magnetic field environment required for the experiment; the second control switch is arranged on the pipeline between the water tank and the superconducting magnet.

[0008] The present invention also provides an experimental method for a corrosion product migration experimental device in a strong magnetic field environment, comprising the following steps:

[0009] Step 1: Add 0.25 m3 of 3 High-purity deionized water and Fe3O4 particles weighed according to experimental needs;

[0010] Step 2, turn on the stirring device and stir thoroughly for 1 h;

[0011] Step 3, turn on the current of the superconducting magnet and wait for the magnetic field to be stably increased to 12 T;

[0012] Step 4, start the water pump, turn on the first control switch and the second control switch, so that the high-purity deionized water and Fe3O4 particles circulate in the loop for 24 hours;

[0013] Step 5, turn off the current of the superconducting magnet and the water pump, and take out the experimental section of the heat transfer tube as experimental group A;

[0014] Step 6, repeat steps 1 to 5, but do not turn on the superconducting magnet current. After 24 hours of circulation, take out the experimental section of the heat transfer tube as control group B;

[0015] Step 7: Organize and record experimental data for analysis.

[0016] The beneficial effects of the present invention are:

[0017] The present invention can experimentally study the deposition of Fe3O4 particles in the heat transfer tube under the pressure, temperature and magnetic field strength designed based on the working condition of the fusion reactor, and compare and analyze the deposition amount of particles in different bend sections. The present invention carries out the corrosion particle migration experiment in the multi-bend heat transfer section in view of the working environment and strong magnetic field characteristics of the fusion reactor, and can display the maximum deposition position of the corrosion particles in the heat transfer tube through intuitive experimental phenomena, indicating that the heat transfer tube section deserves sufficient attention in actual engineering, especially monitoring the radiation dose rate, material loss and corrosion condition at this location.

[0018] The present invention can experimentally obtain the distribution law of granular corrosion products in the heat transfer tube, study the migration and deposition mechanism of the corrosion products in the cooling circuit in the heat transfer tube, and the influence of the magnetic field intensity on the migration behavior of the corrosion products, and provide a reference for the corrosion product control and safety analysis of the fusion reactor. The experimental device and experimental method provided by the present invention can provide the most intuitive data for researchers, and provide a reference for the cooling circuit design and engineering maintenance, corrosion product control and radiation safety evaluation of the fusion reactor. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic diagram of a corrosion product migration experimental device in a strong magnetic field environment of the present invention;

[0020] Figure 2 It is a schematic diagram of the structure of the heat transfer tube experimental section.

[0021] Among them, the figure markings are: 1. stirring device; 2. water tank; 3. deionized water and Fe3O4 particles; 4. first control switch; 5. buffer section; 6. water pump; 7. gate valve; 8. pressure gauge; 9. flow meter; 10. superconducting magnet; 11. heat transfer tube experimental section; 12. second control switch; 13. bending section A; 14. bending section B; 15. straight section. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. In addition, the technical features involved in each embodiment of the present invention described below can be combined with each other as long as they do not conflict with each other. The present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0023] The present invention is implemented in such a way that in the experimental method of corrosion product migration in a strong magnetic field environment, the pressure of the experimental section is maintained at 15MPa, the temperature is 300°C, and the magnetic field strength is 12 T through an autoclave and a superconducting magnet. In the experiment, the magnetic field and the circulation pump are turned on to allow deionized water and Fe3O4 particles to circulate in the experimental loop, and the experimental cycle time is set to 24 hours. After the experiment, the difference in particle mass before and after the experiment is measured, and the deposition of metal particles at different heat transfer pipe sections is compared.

[0024] like Figure 1 As shown, the strong magnetic field environment corrosion product migration experimental device of the present invention includes a stirring device 1, a water tank 2, deionized water and Fe3O4 particles 3, a first control switch 4, a buffer section 5, a water pump 6, a gate valve 7, a pressure gauge 8, a flow meter 9, a superconducting magnet 10, a heat transfer tube experimental section 11, and a second control switch 12. 304 stainless steel pipes are used as main pipelines to connect various devices and equipment. The stirring device 1 and the deionized water and Fe3O4 particles 3 are arranged in the water tank 2. During the experiment, the deionized water and Fe3O4 particles 3 circulate in the experimental loop; the buffer section 5 is connected to the water tank 2 through a pipeline; the first control switch 4 is arranged on the pipeline between the water tank 2 and the buffer section 5; the water pump 6 is connected to the buffer section 5 through a pipeline, and the function of the water pump 6 is to pressurize and transport the deionized water, Fe3O4 particles 3 and metal particles; the gate valve 7 and the water pump 6 are connected through a pipeline; the flow meter 9 and the pressure gauge 8 are arranged after the gate valve 7, and the functions of the flow meter 9 and the pressure gauge 8 are to collect the flow rate and pressure data of the deionized water and Fe3O4 particles 3 respectively; the heat transfer tube experimental section 11 is connected to the gate valve 7 and the water tank 2 through a pipeline; the heat transfer tube experimental section 11 is placed in the superconducting magnet 10, and the function of the superconducting magnet 10 is to provide the 12 T magnetic field environment required for the experiment; the second control switch 12 is arranged on the pipeline between the water tank 2 and the superconducting magnet 10.

[0025] Among them, the water tank 2 is used to hold deionized water and Fe3O4 particles 3, the stirring device 1 keeps the ionized water and Fe3O4 particles 3 uniform, the buffer section 5 is used to reduce the solution pressure in the pipe, the first control switch 4 is used to control the flow rate of the deionized water and Fe3O4 particles 3 in the pipeline, the water pump 6 drives the ionized water and Fe3O4 particles 3 to flow in the pipeline, the gate valve 7 is used to control the opening and closing of the pipeline, the pressure gauge 8 is used to measure the temperature of the ionized water and Fe3O4 particles 3 here, the flow meter 9 is used to measure the flow rate of the deionized water and Fe3O4 particles 3 here, the superconducting magnet 10 generates a magnetic field at the heat transfer tube experimental section 11, and the second control switch 12 is used to control the flow rate of the deionized water and Fe3O4 particles 3 in the pipeline.

[0026] The superconducting magnet 10 is composed of a superconducting coil, a cooling system, a Tesla meter or a Gauss meter. The superconducting coil is made of a superconducting wire and is cooled by liquid helium. The superconducting coil encloses a cylindrical space with a diameter of 100 mm and a height of 300 mm. After the superconducting coil is energized, a 12 T magnetic field environment parallel to the cylindrical axis can be generated in the cylindrical space by adjusting the current intensity. The Tesla meter or Gauss meter is used to measure the magnetic field intensity in the cylindrical space.

[0027] The water tank 2 is provided with a stirring device 1, and a mixture of high-purity deionized water and Fe3O4 particles 3 is circulated. The circulating water in the experiment is high-purity deionized water (resistivity ≥ 15 ), the volume of circulating water is 0.25 m 3 According to experimental needs, weigh Fe3O4 particles with purity > 98%.

[0028] like Figure 2 As shown, the heat transfer tube experimental section 11 is composed of a segmented heat transfer tube, an autoclave, a sealing film, a sealant, a stainless steel tube and fasteners on the outside of the tube. The material of the segmented heat transfer tube is 690 alloy, the inner diameter of each tube is 10 mm, the outer diameter is 20 mm, and there are two bending sections: the radius of the bending section A 13 along the center of the tube is 150 mm, and the radius of the bending section B 14 along the center of the tube is 400 mm. The two bending sections are connected by a straight section 15 with a length of 40 mm. The segmented heat transfer tube is used to simulate the multi-bend design of the fusion reactor cooling loop, and the particle deposition distribution changes of the bending section A 13, the bending section B 14, and the straight section 15 are compared in the experiment. The autoclave is used to heat the circulating water and circulating particles in the pressurized loop, so that the experimental pressure and experimental temperature are maintained at 15MPa and 300℃ respectively, and the superconducting magnet is used to provide a magnetic field environment for the experimental section, so that the magnetic field strength of the experimental section is maintained at 12 T. The sealing film is used to prevent the sealant from contaminating the surface of the heat transfer tube. The sealant is used to seal the water seepage between the segmented heat transfer tubes. The outermost stainless steel tube plays a role in maintaining the geometric shape of the heat transfer tube and fixing the support. The fasteners are used to reinforce the experimental section of the heat transfer tube.

[0029] The heat transfer tube experimental section 11 is coated with a heat insulation layer on the outside and inserted into a cylindrical space with a diameter of 100 mm and a height of 300 mm enclosed by the superconducting coil of the strong magnetic field generating device.

[0030] The measuring instruments include a flow meter 9 and a pressure gauge 8, which are used to monitor the flow rate and pressure of water in the loop.

[0031] After the experiment, the difference in particle mass before and after the experiment was measured, and the segmented heat transfer tube was cut open along the central axis using electric spark cutting to observe and record the distribution of metal particles at different bends.

[0032] The experimental method of the strong magnetic field environment corrosion product migration experimental device of the present invention comprises the following steps:

[0033] Step 1: Add 0.25 m3 of 3 High-purity deionized water and Fe3O4 particles weighed according to experimental needs;

[0034] Step 2, turn on the stirring device 1 and stir thoroughly for 1 h;

[0035] Step 3, turning on the current of the superconducting magnet 10, and waiting for the magnetic field to increase to 12 T;

[0036] Step 4, start the water pump 6, turn on the first control switch 4 and the second control switch 12, so that the high-purity deionized water and Fe3O4 particles circulate in the loop for 24 hours;

[0037] Step 5: Turn off the current of the superconducting magnet 10 and the water pump 6, and take out the heat transfer tube experimental section 11 as the experimental group A.

[0038] Step 6: Repeat the above steps 1 to 5, but do not turn on the superconducting magnet current. After 24 hours of circulation, take out the heat transfer tube experimental section 11 as the control group B.

[0039] Step 7, organize and record the experimental data, and analyze them. The content of the analysis includes but is not limited to: measuring the deposition amount of Fe3O4 particles in the bending section A 13, the bending section B 14, and the straight section 15, and the recorded experimental data is the mass difference before and after the experiment of each segment; using electric spark cutting to cut the bending section A 13, the bending section B 14, and the straight section 15 along the central axis, and observe and record the distribution pattern of Fe3O4 particles in different bending positions; comparing the experimental data of the experimental group A and the control group B, analyzing the influence of the strong magnetic field on the migration and deposition of Fe3O4 particles, and studying the migration mechanism of metal corrosion particles in the bending section A 13, the bending section B 14, and the straight section 15 under a strong magnetic field environment.

[0040] like Figure 2 As shown, the material of the segmented heat transfer tube in the heat transfer tube experimental section 11 is 690 alloy, the inner diameter of each pipe is 10 mm, the outer diameter is 20 mm, and there are two bending sections: the radius of the bending section A 13 along the center of the pipe is 150 mm, and the radius of the bending section B 14 along the center of the pipe is 400 mm. The two bending sections are connected by a straight section 15 with a length of 40 mm. The segmented heat transfer tube is used to simulate the multi-bend design of the fusion reactor cooling loop, and the particle deposition distribution changes at different pipe sections are compared experimentally. The heat transfer tube experimental section 11 is coated with a heat insulation layer on the outside, and is inserted into a cylindrical space with a diameter of 100 mm and a height of 300 mm enclosed by the superconducting coil of the strong magnetic field generating device.

[0041] In step 7, according to the experimental data measurement and analysis process, the experimental data recording and processing steps are as follows:

[0042] (1) The deposition amount of Fe3O4 particles in each elbow segment was measured, and the experimental data recorded was the mass difference before and after the experiment in each segment. .

[0043] (2) Use electric spark cutting to cut the test section of the bent pipe along the central axis, and observe and record the distribution pattern of Fe3O4 particles at different bending positions.

[0044] (3) Compare the experimental data of experimental group A and control group B, analyze the effect of strong magnetic field on the migration and deposition of Fe3O4 particles, and study the migration mechanism of metal corrosion particles in the curved pipe section under strong magnetic field environment.

[0045] The present invention allows high-purity deionized water and Fe3O4 particles to circulate in an experimental loop for 24 hours, measures the difference in particle mass before and after the experiment, and compares the deposition of particles at different heat transfer pipe sections to analyze the influence of a strong magnetic field environment on the migration behavior of metal corrosion particles in a multi-bend heat transfer section. In the above experimental method, high-purity deionized water can be improved to other circulating water with specific water chemical conditions such as a pH value; Fe3O4 particles can be improved to a combination of metal oxide particles of other specific components; the particle size / flow rate of working water / diameter of metal pipes / number of bends, radius and curvature ratio of particles can be adjusted according to specific experimental needs, in order to be closer to the actual working conditions of a fusion reactor, or to study the influence of different factors on the migration behavior of metal corrosion particles, as well as the particle size range, magnetic field strength and bend radius corresponding to the maximum deposition amount. The present invention conducts corrosion particle migration experiments in the multi-bend heat transfer section in view of the working environment and strong magnetic field characteristics of the fusion reactor. The maximum deposition position of corrosion particles in the heat transfer tube can be displayed through intuitive experimental phenomena, indicating that this heat transfer tube section deserves sufficient attention in actual engineering, especially monitoring the radiation dose rate, material loss and corrosion conditions at this location. The above results can provide the most intuitive data for researchers and provide reference for the cooling circuit design and engineering maintenance, corrosion product control and radiation safety evaluation of the fusion reactor.

[0046] In the description of the present invention, it should be understood that the number, orientation or positional relationship of each component shown in the drawings is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific number, a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral body; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances. Although the specific implementation method of the present invention is described above, it should be understood by those skilled in the art that these are only examples, and various changes or modifications can be made to these implementations without departing from the principles and implementations of the present invention. Therefore, the scope of protection of the present invention is defined by the attached claims.

Claims

1. A corrosion product migration experimental device in a strong magnetic field environment, characterized in that: The device comprises a stirring device, a water tank, deionized water and Fe3O4 particles, a first control switch, a buffer section, a water pump, a gate valve, a pressure gauge, a flow meter, a superconducting magnet, a heat transfer tube experimental section, and a second control switch. Each device and equipment is connected by a 304 stainless steel pipe as a main pipeline; the stirring device and the deionized water and Fe3O4 particles are arranged in the water tank, and the deionized water and Fe3O4 particles circulate in the experimental loop during the experiment; the buffer section is connected to the water tank through a pipeline; the first control switch is arranged between the water tank and the buffer section The water pump is connected to the buffer section through a pipeline, and the function of the water pump is to pressurize and transport the deionized water, Fe3O4 particles and metal particles; the gate valve and the water pump are connected through a pipeline; the flow meter and the pressure gauge are arranged after the gate valve, and the functions of the flow meter and the pressure gauge are to collect the flow rate and pressure data of the deionized water and Fe3O4 particles respectively; the heat transfer tube experimental section is connected to the gate valve and the water tank through a pipeline; the heat transfer tube experimental section is placed in the superconducting magnet, and the function of the superconducting magnet is to provide the 12 T magnetic field environment required for the experiment; the second control switch is arranged on the pipeline between the water tank and the superconducting magnet.

2. The corrosion product migration experimental device in a strong magnetic field environment according to claim 1 is characterized in that: The superconducting magnet is composed of a superconducting coil, a cooling system, and a Tesla meter or a Gauss meter.

3. The corrosion product migration experimental device in a strong magnetic field environment according to claim 2 is characterized in that: The superconducting coil is made of superconducting wire and is cooled by liquid helium.

4. The corrosion product migration experimental device in a strong magnetic field environment according to claim 3 is characterized in that: The superconducting coil encloses a cylindrical space with a diameter of 100 mm and a height of 300 mm. When the superconducting coil is energized, a 12 T magnetic field environment parallel to the cylindrical axis is generated in the cylindrical space by adjusting the current intensity.

5. The corrosion product migration experimental device in a strong magnetic field environment according to claim 1 is characterized in that: A stirring device is placed in the water tank, and a mixture of high-purity deionized water and Fe3O4 particles is added into the water tank for circulation.

6. The corrosion product migration experimental device in a strong magnetic field environment according to claim 5 is characterized in that: The circulating water used in the experiment was high-purity deionized water with a resistivity of ≥15 MΩ·cm and a circulating water volume of 0.25 m 3 According to experimental needs, weigh Fe3O4 particles with purity > 98%.

7. The corrosion product migration experimental device in a strong magnetic field environment according to claim 1 is characterized in that: The heat transfer tube experimental section comprises a segmented heat transfer tube, an autoclave, a sealing film, a sealant, a stainless steel tube and fasteners on the outside of the tube; the segmented heat transfer tube is made of 690 alloy, the inner diameter of each tube is 10 mm, the outer diameter is 20 mm, and there are two bending sections: the radius of bending section A along the center of the tube is 150 mm, and the radius of bending section B along the center of the tube is 400 mm, and the two bending sections are connected by a straight section with a length of 40 mm; the segmented heat transfer tube is used to simulate the multi-bend design of the fusion reactor cooling loop, and the experiment compares the changes in the distribution of particle deposition amounts of bending section A, bending section B and straight section; the autoclave is used to heat the circulating water and circulating particles in the pressurized loop, so that the experimental pressure and experimental temperature are maintained at 15 MPa and 300°C respectively, and the superconducting magnet is used to provide a magnetic field environment for the experimental section, so that the magnetic field strength of the experimental section is maintained at 12 T; The sealing film is used to prevent the sealant from contaminating the surface of the heat transfer tube. The outermost stainless steel tube plays a role in maintaining the geometric shape of the heat transfer tube and fixing and supporting it. The fasteners are used to reinforce the experimental section of the heat transfer tube.

8. The corrosion product migration experimental device in a strong magnetic field environment according to claim 1 is characterized in that: The measuring instruments include a flow meter and a pressure gauge, which are used to monitor the flow rate and pressure of water in the loop.

9. The experimental method of the strong magnetic field environment corrosion product migration experimental device according to any one of claims 1 to 8, characterized in that: The steps include: Step 1: Add 0.25 m3 of 3 High-purity deionized water and Fe3O4 particles weighed according to experimental needs; Step 2, turn on the stirring device and stir thoroughly for 1 h; Step 3, turn on the current of the superconducting magnet and wait for the magnetic field to be stably increased to 12 T; Step 4, start the water pump, turn on the first control switch and the second control switch, so that the high-purity deionized water and Fe3O4 particles circulate in the loop for 24 hours; Step 5, turn off the current of the superconducting magnet and the water pump, and take out the experimental section of the heat transfer tube as experimental group A; Step 6, repeat steps 1 to 5, but do not turn on the superconducting magnet current. After 24 hours of circulation, take out the experimental section of the heat transfer tube as control group B; Step 7: Organize and record experimental data for analysis.

10. The experimental method according to claim 9, characterized in that: The step 7 includes: measuring the deposition amount of Fe3O4 particles in the bending section A, the bending section B, and the straight section, and recording the experimental data as the mass difference before and after the experiment of each segment; cutting the bending section A, the bending section B, and the straight section along the central axis by electric spark cutting, observing and recording the distribution pattern of Fe3O4 particles in different bending positions; comparing the experimental data of the experimental group A and the control group B, analyzing the influence of the strong magnetic field on the migration and deposition of Fe3O4 particles, and studying the migration mechanism of metal corrosion particles in the bending section A, the bending section B, and the straight section of the bending pipe under a strong magnetic field environment.

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