Method of treating a sodium purification cold trap and treatment system

Abstract

Embodiments of the present application relate to the field of cold traps used in nuclear reactors, and particularly to a method and system for treating a sodium purification cold trap. The method comprises the following steps: S10, obtaining an image of the inside of the sodium purification cold trap including a central tube; S20, determining a length of time for clearing the central tube of the sodium purification cold trap based on the image; S30, heating the sodium purification cold trap to melt solid sodium into liquid sodium and to enable some impurities to dissolve in the liquid sodium; S40, clearing the central tube of the sodium purification cold trap based on the length of time; S50, cooling the sodium purification cold trap to solidify the liquid sodium and to cause the impurities to deposit below the central tube; and S60, again obtaining an image of the inside of the sodium purification cold trap including the central tube, and determining the treatment of the impurities based on the images obtained before and after treatment. The method of the present application can prolong the service life of the sodium purification cold trap by clearing the central tube and causing the impurities to deposit below the central tube.

Description

Technical Field

[0001] The embodiments of this application relate to the field of liquid metal purification using cold traps in nuclear reactors, specifically to a method and system for purifying sodium cold traps. Background Technology

[0002] The statements herein are provided merely as background information in connection with this application and do not necessarily constitute prior art.

[0003] Sodium purification cold traps are devices used in sodium-cooled fast reactors to purify the liquid sodium coolant.

[0004] During operation, in a sodium-cooled fast reactor, the temperature of liquid sodium drops below the impurity solubility saturation level as it flows through the collection zone. Impurities precipitate from the liquid sodium and are captured by the wire mesh and metal walls of the flow channel, thus purifying the liquid sodium. When the purification capacity of the sodium-cooled cold trap significantly decreases, it is generally considered to have failed and must be disposed of as radioactive waste.

[0005] Currently, sodium purification cold traps have a short service life, which increases the amount of radioactive waste that needs to be processed. Summary of the Invention

[0006] A brief overview of this application is provided below to offer a basic understanding of certain aspects thereof. It should be understood that this overview is not an exhaustive summary of the application. It is not intended to identify key or essential parts of the application, nor is it intended to limit its scope. Its purpose is merely to present certain concepts in a simplified form as a prelude to the more detailed description that follows.

[0007] In a first aspect, embodiments of this application provide a method for processing a sodium purification cold trap, comprising the following steps: S10, acquiring an image of the sodium purification cold trap containing a central tube; S20, determining the unblocking time for the central tube of the sodium purification cold trap based on the image determined in step S10; S30, heating the sodium purification cold trap to melt solid sodium into liquid sodium and to dissolve some impurities in the liquid sodium; S40, unblocking the central tube of the sodium purification cold trap based on the unblocking time determined in step S20; S50, cooling the sodium purification cold trap to solidify the liquid sodium and deposit impurities below the central tube; S60, acquiring another image of the sodium purification cold trap containing the central tube, and determining the impurity processing status based on the images acquired in step S10 and step S60.

[0008] The embodiments of this application determine the unblocking time of the central tube by acquiring images of the central tube of the sodium purification cold trap, thereby facilitating continuous unblocking operations and avoiding frequent interruptions in unblocking operations due to insufficient unblocking time, which would prolong the final unblocking operation time. After unblocking the central tube, the embodiments of this application cool the sodium purification cold trap to allow impurities to deposit below the central tube, preventing impurities from re-entering the central tube and causing blockage. The images obtained before and after unblocking are used to determine the impurity treatment status, which helps to accurately determine whether the central tube has been unblocked. The embodiments of this application, by treating the sodium purification cold trap, can extend its service life and prevent the sodium purification cold trap from being discarded before the wire mesh flow channel in the collection area is blocked and before the design value for impurity collection in the collection area is reached.

[0009] Secondly, embodiments of this application provide a processing system for a sodium purification cold trap. The processing system includes: an image acquisition device, an ultrasonic vibration device, a heating device, two buffer containers, a gas filling and pumping device, and a processor. The heating device is configured to heat the sodium purification cold trap in segments from top to bottom in the vertical direction, so as to melt the solid sodium in the sodium purification cold trap into liquid sodium and to dissolve some impurities in the liquid sodium. The two buffer containers are respectively connected to the sodium inlet pipe and sodium outlet pipe of the sodium purification cold trap to prevent the liquid sodium in the sodium purification cold trap from overflowing. The image acquisition device is configured to acquire an image of the sodium purification cold trap containing a central tube. The ultrasonic vibration device is configured to provide ultrasonic waves to the central tube of the sodium purification cold trap to use the ultrasonic waves to remove impurities from the central tube. The gas filling and pumping device is configured to evacuate the sodium purification cold trap through the two buffer containers and transport inert gas, and use the inert gas to backwash the central tube. The processor is configured to determine the unblocking time of the central tube of the sodium purification cold trap and the processing status of impurities based on the image acquired by the image acquisition device.

[0010] The embodiments of this application acquire images of the central tube inside the sodium purification cold trap using an image acquisition device. This allows for the determination of the time required to clear the central tube using images acquired before clearing, and the assessment of the clearing effect using images acquired before and after clearing. An ultrasonic vibration device and an air-filling / evacuation device are used to allow impurities clogging the central tube to detach. The processing system provided by the embodiments of this application can clear the central tube of the sodium purification cold trap, extend its service life, and prevent the sodium purification cold trap from being discarded before the wire mesh flow channel in the collection area is clogged and before the design value for impurity collection in the collection area is reached.

[0011] Thirdly, embodiments of this application provide a method for processing a sodium-purified cold trap, which is implemented using the processing system provided in the second aspect of this application. Attached Figure Description

[0012] Other objects and advantages of this application will become apparent from the following description of embodiments of this application with reference to the accompanying drawings, and will help to provide a comprehensive understanding of this application.

[0013] Figure 1 This is a schematic diagram of the sodium purification cold trap.

[0014] Figure 2 This is a schematic diagram of the processing system and assembly of the sodium purification cold trap according to an embodiment of this application.

[0015] Figure 3 This is a schematic diagram of the heating device according to an embodiment of this application.

[0016] Figure 4 This is an exploded view of the heating assembly according to an embodiment of this application.

[0017] Figure 5 This is a schematic diagram of the structure of the insulating mounting assembly according to an embodiment of this application.

[0018] Figure 6 This is a schematic diagram of the heating assembly of an embodiment of this application, omitting the insulating mounting assembly.

[0019] Figure 7 This is a schematic diagram of the assembly apparatus according to an embodiment of this application.

[0020] Figure 8 This is a schematic diagram of the structure of the insulating connector according to an embodiment of this application.

[0021] It should be noted that the accompanying drawings are not necessarily drawn to scale, but are shown only in a schematic manner without affecting the reader's understanding.

[0022] Explanation of reference numerals in the attached figures: 10. Image acquisition device; 20. Ultrasonic vibration device; 30. Heating device; 31. Heating assembly; 311. Insulation component; 3111. End limiting component; 3112. Intermediate connector; 312. Coil; 313. Shielding assembly; 3131. Metal component; 314. Insulation mounting assembly; 3141. End insulation component; 3142. Insulation connection assembly; 31421. Mounting plate; 314211. Mounting hole; 31422. First connector; 31423. Second connector; 3143. Coil insulation fixing assembly; 31431. Inner fixing component; 31432. Outer fixing component; 3144. Coil lead component; 31441. Inlet; 31442. Outlet; 32. Assembly device; 321. Frame body; 3211. Frame Layer; 32111, First connecting rod; 32112, Second connecting rod; 321121, First metal rod; 321122, Insulating connector; 3211221, Insulating body; 3211222, Plug-in connector; 3212, Frame connector; 32121, Second metal rod; 32122, Reinforcing member; 32123, Insulating layer; 3213, Reinforcing connector; 322, Heating mounting assembly; 3221, Heating mounting rod; 323, Connecting assembly; 3231, First frame connecting rod; 3232, Second frame connecting rod; 324, Insulating load-bearing assembly; 3241, Load-bearing limiting member; 32411, Lifting hole; 32412, Limiting groove; 3242, Insulating member; 40. Buffer container; 50. Inflation and extraction device; 51. Inflation component; 52. Extraction component; 53. Steam trap; 60. Sodium purification cold trap; 61. Sodium inlet pipe; 62. Sodium outlet pipe; 63. Central pipe; 64. Top end cap; 65. Straight section; 66. Bottom end cap; 67. Thermocouple mounting bracket; 68. Wire mesh for collection area; 69. Cooling chamber; 70. Processor. Detailed Implementation

[0023] Exemplary embodiments of this application will be described below with reference to the accompanying drawings. For clarity and brevity, not all features of actual implementations are described in the specification. However, it should be understood that many implementation-specific decisions must be made in the development of any such actual embodiment to achieve the developer's specific goals, such as complying with constraints related to the system and business, and these constraints may vary depending on the implementation. Furthermore, it should be understood that while development work can be very complex and time-consuming, such development work is merely a routine task for those skilled in the art who benefit from the content of this application.

[0024] It should also be noted that, in order to avoid obscuring this application with unnecessary details, only the equipment structure and / or processing steps closely related to the solution according to this application are shown in the accompanying drawings, while other details that are not closely related to this application are omitted.

[0025] See Figure 1 , Figure 1 This is a schematic diagram of the sodium purification cold trap. The collection zone mesh 68 can be a ring structure, and the central tube 63 can be located radially inside the collection zone mesh 68. Liquid sodium enters the upper part of the sodium purification cold trap 60 through the sodium inlet pipe 61, flows through the collection zone mesh 68, enters the bottom end cap 66, flows upward into the central tube 63, enters the liquid outlet pipe, and then flows through the sodium outlet pipe 62 to exit the sodium purification cold trap 60.

[0026] Currently, once the purification capacity of the sodium purification cold trap 60 significantly decreases, it will be discarded, leading to an increase in the number of discarded sodium purification cold traps 60 and an increase in the amount of radioactive waste to be disposed of.

[0027] The inventors of this application discovered that the significant decrease in the purification capacity of the sodium purification cold trap 60 may be due to the blockage of the central tube 63 of the sodium purification cold trap 60 caused by impurities. This is because the lowest sodium temperature point in the sodium purification cold trap 60 during operation is the central tube 63, and a large number of impurities will precipitate at the thermocouple fixing bracket 67 position inside the central tube 63, and adhere to and block the central tube 63 of the sodium purification cold trap. At this time, the flow channel of the collection area wire mesh 68 of the sodium purification cold trap 60 is not yet blocked and has not reached the design value. If the sodium purification cold trap 60 is discarded, it will result in a great waste.

[0028] To address the aforementioned problems, embodiments of this application provide a method for processing a sodium purification cold trap, which may include the following steps: S10, acquiring an image of the sodium purification cold trap 60 containing a central tube 63; S20, determining the unblocking time for the central tube 63 of the sodium purification cold trap 60 based on the image determined in step S10; S30, heating the sodium purification cold trap 60 to melt solid sodium into liquid sodium and to dissolve some impurities in the liquid sodium; S40, unblocking the central tube 63 of the sodium purification cold trap 60 based on the unblocking time determined in step S20; S50, cooling the sodium purification cold trap 60 to solidify the liquid sodium and deposit impurities below the central tube 63; S60, acquiring another image of the sodium purification cold trap 60 containing the central tube 63, and determining the impurity processing status based on the images acquired in step S10 and step S60.

[0029] The embodiments of this application determine the unblocking time of the central tube 63 by acquiring an image of the central tube 63 of the sodium purification cold trap 60, thereby facilitating continuous unblocking operations of the central tube 63 and avoiding frequent interruptions in unblocking operations due to insufficient unblocking time, which would prolong the final unblocking operation time. The embodiments of this application also cool the sodium purification cold trap 60 after unblocking the central tube 63 to allow impurities to deposit below the central tube 63, preventing impurities from re-entering the central tube 63 and causing blockage. Furthermore, the images obtained before and after unblocking are used to determine the impurity treatment status, which helps to accurately determine whether the central tube 63 has been unblocked. The embodiments of this application extend the service life of the sodium purification cold trap 60 by processing it, preventing the sodium purification cold trap 60 from being discarded before the flow channel of the wire mesh 68 in the collection area is blocked and before the design value for impurity collection in the collection area is reached.

[0030] In some embodiments, step S20 may include: S21, determining the blockage status of the central tube 63 of the sodium purification cold trap 60 based on the image obtained in step S10; and S22, determining the unblocking time for the central tube 63 of the sodium purification cold trap 60 based on the blockage status.

[0031] In this embodiment, the degree of blockage is determined by the image of the central tube 63, allowing the operator to judge the required unblocking time before unblocking, avoiding repeated steps of heating to dissolve impurities and cooling to precipitate impurities, thus interrupting the unblocking of the central tube 63 and shortening the unblocking time.

[0032] In some embodiments, an image acquisition device can be installed on the outer wall of the bottom end cap 66 of the sodium purification cold trap 60 to acquire an image including the central tube 63. The acquired image can be an ultrasound or X-ray image, and the degree of blockage can be determined by the color intensity, size, and distribution of the image at the central tube 63. For example, an image of the central tube 63 can be obtained before the sodium purification cold trap 60 is used, thus obtaining an image when the central tube 63 is completely unblocked.

[0033] In some embodiments, step S40 may include: S41, backflushing the central tube 63 with inert gas. Backflushing the central tube 63 with inert gas means that the direction of the inert gas flow is opposite to the direction of the liquid sodium flow during normal operation of the sodium purification cold trap 60. In such embodiments, impurities adhering to the central tube 63 can be loosened and detached from the central tube 63 under the impact of the inert gas, facilitating the dissolution of the impurities in the liquid sodium or their deposition below the central tube 63.

[0034] A high-speed flow of inert gas can be continuously supplied from the sodium outlet pipe 62 to the central pipe 63 so that the detached impurities can fall into the liquid sodium below the central pipe 63 and dissolve or deposit.

[0035] In some embodiments, step S40 may include: S42, using ultrasound to vibrate the solid impurities remaining in the central tube 63 to detach them from the central tube 63. In such embodiments, the vibration of the ultrasound can cause the liquid sodium to fluctuate, and the liquid sodium repeatedly flows and washes away the impurities in the lower part of the central tube 63, so that the more stubbornly adsorbed impurities are detached from the central tube 63 and dissolved in the liquid sodium under the cavitation effect of the liquid sodium flow and ultrasound.

[0036] In some embodiments, steps S41 and S42 may be repeated alternately in step S40. In such an embodiment, impurities adhering to the central tube 63 are detached layer by layer from the central tube 63 and dissolved in liquid sodium.

[0037] In some embodiments, in step S40, when the flow rates of the inert gas entering and exiting the central pipe 63 in step S41 are substantially the same, and the duration of unblocking the central pipe 63 of the sodium purification cold trap 60 reaches the unblocking duration determined in step S20, step S50 can be executed. "Substantially the same flow rates of the inert gas entering and exiting the central pipe 63" can be understood as the difference between the flow rates of the sodium inlet pipe 61 and the sodium outlet pipe 62 being less than 5% of the flow rate of the sodium inlet pipe 61. When the flow rates of the inert gas entering and exiting the central pipe 63 are substantially the same, the blockage in the central pipe 63 has been greatly alleviated. Using the flow rates of the central pipe 63 and the time determined in step S20 as criteria for determining whether to continue unblocking helps improve the accuracy of the judgment.

[0038] In some embodiments, during steps S30 and S41, the gas pressure inside the sodium purification cold trap 60 can be detected and maintained within a preset range. This prevents excessive gas pressure in the sodium purification cold trap 60 from causing safety hazards.

[0039] The preset range of air pressure can be the design safety threshold of the air pressure of the sodium purification cold trap 60, and the air pressure can be maintained within the preset range at a level lower than the safety threshold.

[0040] In some embodiments, step S30 may include: S31, heating the upper end cap 64 of the sodium purification cold trap 60 to a first target temperature; S32, heating the first segment of the straight cylindrical section 65 of the sodium purification cold trap 60 from top to bottom to the first target temperature, while simultaneously heating the upper end cap 64 to its final target temperature; S33, heating the second segment of the straight cylindrical section 65 of the sodium purification cold trap 60 from top to bottom to the first target temperature, while simultaneously heating the portion above the second segment to increase its temperature by ΔT, until each part reaches its respective final target temperature. Through the above heating method, the embodiments of this application ensure that during the heating process of the sodium purification cold trap 60, the temperature of the upper part of the straight cylindrical section 65 is always higher than the temperature of the lower part. Since the upper end cap 64 is typically an air cavity, the sodium purification cold trap 60 has sufficient space to accommodate the volume of expansion when solid sodium melts into liquid sodium; and each part of the sodium purification cold trap 60 is heated with the same temperature difference, avoiding excessive thermal stress during the heating process.

[0041] In some embodiments, the heating rate of each part of the sodium purification cold trap 60 is the same, further avoiding excessive thermal stress during the heating process.

[0042] In some embodiments, the first target temperature can be a temperature higher than the melting point of sodium, such as 100°C. This allows the liquid sodium in the previous section to be kept in a flowing state before heating the next section, which helps to ensure that there is always a controllable free liquid surface in the sodium purification cold trap 60.

[0043] In some embodiments, the upper end cap 64 corresponds to a gas cavity, so its final target temperature can be 200°C. The final target temperature of the straight section 65 can be a temperature that allows impurities such as sodium oxides and hydrides to completely dissolve in liquid sodium, such as 400°C. In some embodiments, ΔT can be a temperature that avoids excessive thermal stress caused by temperature difference, such as 50°C. In some embodiments, the heating rate can be a rate that avoids excessive thermal stress caused by excessively rapid heating, for example, a heating rate ≤30°C / h.

[0044] In some embodiments, step S50 may include: S51, stopping heating the sodium purification cold trap 60; S52, making the cooling rate of the bottom end cap 66 of the sodium purification cold trap 60 greater than the cooling rate of other parts of the sodium purification cold trap 60, thereby causing impurities to precipitate and deposit below the central tube 63. By stopping heating the sodium purification cold trap 60, the temperature of the sodium purification cold trap 60 can decrease; by making the cooling rate of the bottom end cap 66 of the sodium purification cold trap 60 greater than the cooling rate of other parts of the sodium purification cold trap 60, the temperature of the bottom end cap 66 of the sodium purification cold trap 60 is lower than the temperature of the upper parts, that is, making the temperature below the central tube 63 the lowest temperature in the entire sodium purification cold trap 60, which facilitates the precipitation and deposition of impurities below the central tube 63, thereby staying at the bottom end cap 66 of the sodium purification cold trap 60, and preventing impurities from entering the central tube 63 and causing blockage of the central tube 63 and the sodium outlet tube 62.

[0045] In some embodiments, an air-cooling device can be installed at the bottom end cap of the sodium purification cold trap 60 to cool the bottom end cap 66 of the sodium purification cold trap 60, while the other parts of the sodium purification cold trap 60 are cooled naturally, so that the cooling rate of the bottom end cap 66 of the sodium purification cold trap 60 is greater than that of the other parts of the sodium purification cold trap 60.

[0046] In some embodiments, step S60 may be followed by: if the central tube 63 of the sodium purification cold trap 60 is not completely cleared, repeating steps S10-S60 until the central tube 63 is substantially cleared. "Substantially cleared" here can be understood as the inert gas flow rate into and out of the central tube 63 being substantially the same. In such embodiments, the sodium purification cold trap 60 is made clear, allowing it to be reused.

[0047] Embodiments of this application also provide a processing system for a sodium-purified cold trap. See also Figure 2 , Figure 2This is a schematic diagram of the processing system and assembly of the sodium purification cold trap according to an embodiment of this application. The processing system may include: an image acquisition device 10, an ultrasonic vibration device 20, a heating device, two buffer containers 40, a gas filling and vacuuming device 50, and a processor; the image acquisition device 10 is configured to acquire an image of the sodium purification cold trap 60 containing the central tube 63; the heating device is configured to heat the sodium purification cold trap 60 in segments from top to bottom in the height direction, so as to melt the solid sodium in the sodium purification cold trap 60 into liquid sodium and to dissolve some impurities in the liquid sodium; the two buffer containers 40 are respectively connected to the sodium inlet pipe 61 and the sodium outlet pipe 62 of the sodium purification cold trap 60 to prevent the liquid sodium in the sodium purification cold trap 60 from overflowing; the ultrasonic vibration device 20 is configured to provide ultrasonic waves to the central tube 63 of the sodium purification cold trap 60, so as to use ultrasonic waves to remove impurities from the central tube 63; the gas filling and vacuuming device 50 is configured to evacuate the sodium purification cold trap 60 through the two buffer containers 40 and transport inert gas, and use inert gas to backwash the central tube 63. The processor is configured to determine the unblocking time of the central tube 63 of the sodium purification cold trap and the treatment status of impurities based on the images acquired by the image acquisition device 10.

[0048] The embodiments of this application acquire images of the central tube 63 inside the sodium purification cold trap 60 using an image acquisition device 10. This allows for the determination of the time required to clear the central tube 63 using images acquired before clearing, and the determination of the clearing effect using images acquired before and after clearing. The ultrasonic vibration device 20 and the air inflation / extraction device 50 allow impurities clogging the central tube 63 to detach. The processing system provided by the embodiments of this application can clear the central tube 63 of the sodium purification cold trap 60, extend the service life of the sodium purification cold trap 60, and prevent the sodium purification cold trap from being discarded before the flow channel of the collection zone mesh 68 is blocked and before the design value for impurity collection in the collection zone is reached.

[0049] In some embodiments, the capacity of the buffer container 40 can be determined based on the image acquired by the image acquisition device 10 to determine the amount of solid sodium inside the sodium purification cold trap 60, ensuring that the buffer container 40 can contain the liquid sodium that overflows from the sodium purification cold trap 60 after heating.

[0050] In some embodiments, the inflation and degassing device 50 may include an inflation member 51, a degassing member 52, and two vapor traps 53; the inflation member 51 is configured to provide inert gas to the sodium inlet pipe 61 and the sodium outlet pipe 62 respectively; the degassing member 52 is configured to extract gas from the sodium inlet pipe 61 and the sodium outlet pipe 62 respectively, so as to form a vacuum inside the sodium purification cold trap 60; the inflation member 51 and the degassing member 52 are respectively connected to two buffer containers 40 through the two vapor traps 53, and the two vapor traps 53 are used to prevent sodium vapor from entering the degassing member 52.

[0051] By configuring the extraction component 52 to extract gas from the sodium inlet pipe 61 and the sodium outlet pipe 62 respectively, gas can be extracted from both the sodium inlet pipe 61 and the sodium outlet pipe 62 simultaneously when processing the sodium purification cold trap 60. This avoids the situation where gas cannot be completely extracted due to blockage of the central pipe 63, thereby preventing sodium combustion or the generation of more sodium-containing impurities when heating the sodium purification cold trap 60. By configuring the gas filling component 51 to provide inert gas to the sodium inlet pipe 61 and the sodium outlet pipe 62 of the sodium purification cold trap 60 respectively, it can blow gas in the opposite direction to the central pipe 63 to remove impurities on the central pipe 63, and cooperate with the extraction component 52 to purge the sodium purification cold trap 60 with inert gas.

[0052] In some embodiments, the sodium purification cold trap 60 includes a cooling section disposed radially outside the cylindrical section 65 for cooling the collection zone mesh 68 during liquid sodium purification. The cooling section forms a cooling chamber 69, within which cooling water circulates to cool the collection zone mesh 68 during liquid sodium purification.

[0053] The heating device can be located on the radial outer side of the cooling section.

[0054] In some embodiments, see Figure 3 and Figure 4 , Figure 3 This is a schematic diagram of the heating device according to an embodiment of this application. Figure 4 This is an exploded view of the heating assembly according to an embodiment of this application. The heating device 30 may include: a plurality of heating assemblies 31, which are arranged coaxially; each heating assembly 31 is configured to avoid interfering with the coils of adjacent heating assemblies 31.

[0055] In such an embodiment, adjacent heating components 31 do not interfere with each other, thereby enabling each heating component 31 to heat the sodium purification cold trap 60 separately in segments, thus ensuring that the temperature of the upper part of the sodium purification cold trap 60 is always higher than the temperature of its lower part.

[0056] In some embodiments, each heating component 31 has the same structure.

[0057] In some embodiments, see Figures 3 to 5 , Figure 4 This is an exploded view of the heating assembly according to an embodiment of this application. Figure 5 This is a schematic diagram of the insulation mounting assembly according to an embodiment of this application, omitting a portion of the structure. Figure 6This is a schematic diagram of the heating assembly without insulation mounting assembly according to an embodiment of this application. The heating assembly 31 may include: a heat insulation member 311, a coil 312, two shielding assemblies 313, and an insulation mounting assembly 314; the heat insulation member 311 is configured to heat the sodium purification cold trap 60; the coil 312 is disposed radially outside the heat insulation member 311 and is configured to perform high-frequency heating of the sodium purification cold trap 60 through electromagnetic induction; the two shielding assemblies 313 are configured to electromagnetically shield the coil 312 on both axial sides of the coil 312 and are configured to prevent the coil 312 from being heated; the insulation mounting assembly 314 is used to insulately assemble the coil 312, the heat insulation member 311, and the shielding assemblies 313 together, and is detachably connected to the assembly device for supporting the sodium purification cold trap 60.

[0058] In this embodiment, by providing two shielding components 313 on both sides of the axial direction of the coil 312 to electromagnetically shield the coil 312, it is possible to prevent the generation of induced voltage between the coils 312 of adjacent heating components 31, which would cause voltage instability in the coils 312 of the heating components 31, making it difficult to accurately control the heating temperature of the coils 312. In other words, by providing two shielding components 313 on both sides of the axial direction of the coil 312, this embodiment helps to stabilize the voltage of each coil 312, thereby enabling accurate control of the heating temperature of the coils 312. Simultaneously, it also allows the coil 312 to heat only the portion of the sodium purification cold trap 60 located radially inward, preventing heating of the portion of the sodium purification cold trap 60 extending beyond the axial ends of the coil 312, thus ensuring accurate control of the sodium purification temperature. The heating position of the cold trap 60 is more precise, enabling more accurate segmented heating of the sodium purification cold trap 60. Simultaneously, the shielding component 313, designed to be unheated by the coil 312, avoids overheating and structural damage, ensuring the overall service life of the heating component 31. By placing the insulation component 311 radially inside the coil 312, between the coil 312 and the sodium purification cold trap 60, direct connection or collision between the sodium purification cold trap 60 and the coil 312 is prevented, and the coil 312 is protected from damage. Furthermore, the insulating mounting component 314 facilitates the insulated assembly of the various structures of the heating component 31 and allows for detachable installation on the assembly device, enabling each heating component 31 to heat different areas of the sodium purification cold trap 60 independently. Therefore, the heating device can accurately control the heating position and temperature when heating the sodium purification cold trap 60, reducing safety risks.

[0059] In some embodiments, the coil 312 that heats the sodium purification cold trap 60 is a high-frequency coil. High-frequency coils are greatly affected by adjacent coils. By providing two shielding components 313 on both sides of the axial direction of the coil 312 to electromagnetically shield the coil 312, it is more beneficial to avoid the generation of induced voltage by adjacent high-frequency coils.

[0060] When the sodium purification cold trap 60 is processed using the heating device 30, the number of heating components 31 can be determined according to the size of the sodium purification cold trap 60 and assembled in the assembly device.

[0061] In some embodiments, two shielding components 313 may be respectively disposed on both sides of the axial direction of the coil 312. Each shielding component 313 may include: a plurality of metal parts 3131, the plurality of metal parts 3131 forming a non-closed ring structure along the circumferential direction, and at least two of the plurality of metal parts 3131 are not electrically connected to each other.

[0062] In such an embodiment, a closed conductive loop is not formed between the multiple metal parts 3131, and a ring-shaped eddy current is not generated between the multiple metal parts 3131, so that they are not heated by electromagnetic induction by the coil 312, so that the shielding assembly 313 can maintain its structural strength and service life.

[0063] In some embodiments, the metal part 3131 may be made of copper.

[0064] In some embodiments, the insulating mounting assembly 314 may include two end insulators 3141, a plurality of insulating connection assemblies 3142, a coil insulating fixing assembly 3143, and a coil lead member 3144; the coil insulating fixing assembly 3143 is configured to support and fix the coil 312; the two end insulators 3141 are respectively fixedly connected to the coil insulating fixing assembly 3143 at both ends; the plurality of insulating connection assemblies 3142 are configured to connect the two end insulators 3141 on the radially outer side of the coil 312 for connection with the assembly device; the coil lead member 3144 is used to arrange the leads of the coil 312, and the coil lead member 3144 is disposed on one insulating connection assembly 3142; wherein, the coil insulating fixing assembly 3143 is disposed on the radially outer side of the insulation member 311; each shielding assembly 313 is respectively disposed between a corresponding end insulator 3141 and the coil insulating fixing assembly 3143.

[0065] In this embodiment, by providing multiple coil insulation fixing components 3143 on the radially outer side of the insulation component 311 to support and fix the coil 312, and by using multiple insulation connecting components 3142 to connect the two end insulation components 3141 together on the radially outer side of the coil 312, the coil insulation fixing components 3143 can be fixed between the two end insulation components 3141, thereby enabling the insulation mounting component 314 to fix the coil 312, the insulation component 311 and the shielding component 313 together, so that the heating component 31 forms an integral structure and facilitates the connection of the heating component 31 to the assembly device.

[0066] In some embodiments, the metal part 3131 is fixed to the insulating plate of the end insulating part 3141 by ceramic bolts.

[0067] In some embodiments, the coil insulation fixing assembly 3143 is connected to two end insulators 3141 and two shielding assemblies 313, thereby connecting the coil 312 and the insulation mounting assembly 314 as a whole.

[0068] In some embodiments, the coil insulation fixing assembly 3143 may include a plurality of inner fixing members 31431 and a plurality of outer fixing members 31432. The inner fixing members 31431 are disposed on the radial inner side of the coil 312, and the outer fixing members 31432 are disposed on the radial outer side of the coil 312. The inner fixing members 31431 and the outer fixing members 31432 are connected together with two end insulating members 3141 and two shielding assemblies 313, thereby fixing the coil 312 on both radial sides.

[0069] In some embodiments, the inner fixing member 31431 and the outer fixing member 31432 form a coil fixing groove on the side surface facing the coil 312, thereby fixing the coil 312 to maintain the pitch of the coil 312.

[0070] In some embodiments, each end insulator 3141 may be configured to form a closed ring structure for better insulation.

[0071] In some embodiments, each insulating connection assembly 3142 may include a plurality of mounting plates 31421, two first connectors 31422, and a second connector 31423; the two first connectors 31422 are respectively connected to the surfaces of the two end insulators 3141 facing each other on the radially outer side of the coil 312, that is, the first connector 31422 is connected to the surface of one end insulator 3141 facing the other end insulator 3141; the second connector 31423 is used to connect the two first connectors 31422; both ends of each mounting plate 31421 are respectively connected to the two first connectors 31422, and protrude radially outward from the end insulators 3141 along the coil 312 for connection with the assembly device; the coil lead 3144 is connected to the two first connectors 31422 of an insulating connection assembly 3142. In this embodiment, the mounting plate 31421 can be stably connected to the end insulating member 3141 through the two first connectors 31422. At the same time, since it protrudes outward along the coil 312 radially from the end insulating member 3141, the end insulating member 3141 can not affect the fit between the mounting plate 31421 and the assembly device, which facilitates the connection with the assembly device.

[0072] In some embodiments, each mounting plate 31421 may have a plurality of mounting holes 314211 formed therethrough, which are used for fasteners to pass through to fix the mounting plate 31421 to the assembly device to improve the stability of the connection.

[0073] In some embodiments, the surfaces of the two first connectors 31422 facing away from the coil 312 along the radial direction of the coil 312 are located in the same plane. In such an embodiment, the mounting plate 31421, when mounted on the two first connectors 31422, can be parallel to the axis of the coil 312, so that when multiple heating components 31 are mounted on the assembly device, the corresponding mounting plate 31421 of each heating component 31 can be in the same plane, which facilitates installation.

[0074] In some embodiments, the insulation component 311 may include two end limiting members 3111 and an intermediate connecting member 3112. The two end limiting members 3111 are disposed on both axial sides of the intermediate connecting member 3112, and both end limiting members 3111 protrude from the insulation mounting assembly 314 in both the axial and radial directions of the coil 312 to limit the insulation mounting assembly 314. The coil 312 is disposed on the radially outer side of the intermediate connecting member 3112. In such an embodiment, by using the two end limiting members 3111 of the insulation component 311 to limit the insulation mounting assembly 314, after the insulation mounting assembly 314 is fixedly connected to the assembly device, it is possible to maintain the position of the insulation component 311 without mechanically connecting the insulation component 311 to the insulation mounting assembly 314.

[0075] In some embodiments, the insulation element 311 can be made of a non-metallic material. In such embodiments, the insulation element 311 is not heated by the coil 312, thus avoiding affecting the heating effect of the coil 312 on the sodium purification cold trap 60 located radially inside the insulation element 311.

[0076] In some embodiments, the insulating connection assemblies 3142 are arranged at equal intervals along the circumferential direction of the coil 312. In such embodiments, when the heating assembly 31 is installed in the assembly device, each connecting rod of the assembly device bears the same pressure.

[0077] In some embodiments, each insulating connection assembly 3142 may include two mounting plates 31421, which are respectively connected to both ends of the first connector 31422, so that the heating assembly 31 is more stable when installed in the assembly device.

[0078] In some embodiments, the first connector 31422 may be connected to the end insulator 3141 by a fastener extending along the thickness direction of the end insulator 3141, so that the connection between the first connector 31422 and the end insulator 3141 is more stable.

[0079] In some embodiments, the mounting plate 31421 and the first connector 31422 can be connected by fasteners extending along the thickness direction of the mounting plate 31421 to make the connection between the mounting plate 31421 and the first connector 31422 more stable.

[0080] See Figure 7 , Figure 7 This is a schematic diagram of the assembly device according to an embodiment of this application. In some embodiments, the heating device 30 may further include an assembly device 32, which is configured to connect to the insulating mounting assembly 314 of each heating component 31 and to suspend the sodium purification cold trap 60 on the radially inner side of the insulation member 311 of each heating component 31.

[0081] In such an embodiment, by providing the assembly device 32, the heating component 31 and the assembly device 32 can be assembled into one unit. At the same time, the sodium purification cold trap 60 can be suspended on the radial inner side of the insulation component 311 of each heating component 31, so as to use the heating component 31 to heat the sodium purification cold trap 60.

[0082] In some embodiments, the coil lead 3144 may be provided with an inlet 31441 and an outlet 31442. When multiple heating components 31 are assembled on the assembly device 32, the coil lead 3144 of each heating component 31 is aligned to avoid the leads of each coil 312 entering and exiting from the inlet 31441 and outlet 31442 of the coil lead 3144 crossing.

[0083] In some embodiments, the assembly device 32 may include: a frame body 321, a heating mounting assembly 322, a connecting assembly 323, and an insulating support assembly 324; the heating mounting assembly 322 is used to mount the heating assembly 31; the connecting assembly 323 is used to connect the heating mounting assembly 322 to the frame body 321; the insulating support assembly 324 is used to insulately suspend the sodium purification cold trap 60 to the frame body 321; the frame body 321 is configured to prevent the coil of the heating assembly 31 from heating; the insulating support assembly 324 is configured to prevent the frame body 321 from being heated by the coil of the heating assembly 31, and to limit the heating mounting assembly 322; the heating mounting assembly 322 is configured to prevent the coil 312 of the heating assembly 31 from heating.

[0084] In the embodiments of this application, the frame body 321, the insulating support component 324, and the heating mounting component 322 are all configured to not be heated by the coil 312 of the heating component 31. This prevents the frame body 321, the insulating support component 324, and the heating mounting component 322 from undergoing structural deformation due to heating, thus avoiding any impact on structural strength and energy waste. Furthermore, the insulating support component 324 can limit the heating mounting component 322, making the structure of the heating mounting component 322 more stable. Consequently, the assembly device 32 can more stably support the heating component 31 and the sodium purification cold trap 60.

[0085] In some embodiments, the frame body 321 may include multiple spaced frame layers 3211, a plurality of frame connectors 3212 for fixing the multiple frame layers 3211 together, and a plurality of reinforcing connectors 3213; an insulating load-bearing assembly 324 is connected to the outermost frame layer 3211; a heating mounting assembly 322 is fixedly connected to each frame layer 3211; each reinforcing connector 3213 is used to connect to a frame layer 3211 and a frame connector 3212; wherein each frame layer 3211 and the plurality of frame connectors 3212 together form an annular structure, and the annular structure is a non-closed loop, thereby improving the mechanical strength of the frame body 321 and avoiding the formation of a conductive loop, so that the annular structure will not be heated when the coil 312 heats the sodium purification cold trap 60.

[0086] In some embodiments, the number of frame connectors 3212 can be four; each frame layer 3211 includes three first connecting rods 32111 and one second connecting rod 32112, each first connecting rod 32111 and second connecting rod 32112 being connected to two frame connectors 3212 respectively to form a closed quadrilateral; each reinforcing connector 3213 is used to connect the first connecting rod 32111 or the second connecting rod 32112 to one frame connector 3212; wherein the second connecting rod 32112 is at least partially formed of insulating material along its length. In such an embodiment, each frame layer 3211 and the frame connector 3212 together form a closed quadrilateral structure, which is beneficial to improving the overall structural strength, making it more stable when supporting the sodium purification cold trap 60 and the heating assembly 31; at the same time, since the second connecting rod 32112 is at least partially formed of insulating material along its length, the closed quadrilateral structure does not form a conductive circuit, thereby preventing it from being heated when the coil 312 heats the sodium purification cold trap 60.

[0087] In some embodiments, the second connecting rod 32112 may include: two first metal rods 321121 and an insulating connector 321122; the first metal rods 321121 are each connected to a frame connector 3212; the insulating connector 321122 is used to connect the two first metal rods 321121 insulatedly. Embodiments of this application use the insulating connector 321122 to insulate the first metal rods 321121, thereby increasing the structural strength of the frame layer 3211 without forming a conductive closed loop, thus making it more stable when supporting the sodium purification cold trap 60 and the heating assembly 31.

[0088] See Figure 7 and Figure 8 , Figure 8 This is a schematic diagram of the structure of the insulating connector according to an embodiment of this application. In some embodiments, the opposing end faces of the two first metal rods 321121 can each form a connecting groove; the insulating connector 321122 includes an insulating body 3211221 and two plug-in pieces 3211222 connected to the insulating body 3211221, each plug-in piece 3211222 being plugged into a corresponding connecting groove. The embodiments of this application, through the plug-in connection method, can improve the connection strength between the first metal rods 321121 and the insulating connector 321122 without forming a conductive closed circuit.

[0089] In some embodiments, the frame connector 3212 may include a second metal rod 32121, an insulating layer 32123 connected to the bottom of the second metal rod 32121, and a reinforcing member 32122 for connecting the second metal rod 32121 and the insulating layer 32123. By providing the insulating layer 32123, the conductive connection between the second metal rod 32121 and the support surface (such as the ground) can be blocked, so that the frame connector 3212 will not form a closed conductive circuit with the support surface, thus preventing the frame connector 3212 from being heated by the coil 312. At the same time, the insulating layer 32123 is used to increase the contact area with the support surface, making the structure of the frame connector 3212 more stable.

[0090] In some embodiments, there may be a preset distance between the plane of the frame layer 3211 furthest from the insulating support component 324 and the support surface that contacts the insulating layer 32123 at the bottom of the reinforcing member 32122, so that when the assembly device 32 is transferred, the transport device for transfer can be inserted between the frame layer 3211 furthest from the insulating support component 324 and the insulating layer 32123, which facilitates the transfer of the assembly device 32.

[0091] In some embodiments, the heating mounting assembly 322 may include a plurality of heating mounting rods 3221, each heating mounting rod 3221 having a plurality of mounting holes along its length for mounting the heating assembly 31; a connecting assembly 323 is used to connect each heating mounting rod 3221 to a frame layer 3211 of any frame body 321. In such embodiments, the heating assembly 31 can be mounted and fixed by a plurality of heating mounting rods 3221, making the heating assembly 31 more stable; the connection of each heating mounting rod 3221 to each frame layer 3211 via the connecting assembly 323 can improve the structural stability of the heating mounting rod 3221.

[0092] In some embodiments, the heating mounting rod 3221 may be made of a non-magnetic material to prevent a closed conductive circuit from being formed between the heating assembly 31 and the frame body 321, thus avoiding the frame body 321 from being heated by the coil 312. For example, the heating mounting rod 3221 may be made of a ceramic matrix composite material.

[0093] In some embodiments, the connecting assembly 323 includes: a plurality of first frame connecting rods 3231 and a plurality of second frame connecting rods 3232; the plurality of first frame connecting rods 3231 are used to connect each heating mounting rod 3221 to a first connecting rod 32111 of the multilayer frame layer 3211; the plurality of second frame connecting rods 3232 are used to connect the first frame connecting rod 3231 furthest from the insulating support assembly 324 to the frame layer 3211 furthest from the insulating support assembly 324.

[0094] In this embodiment, each heating mounting rod 3221 can be connected to each frame layer 3211 via multiple first frame connecting rods 3231, and simultaneously connected to the first frame connecting rod 3231 furthest from the insulating load-bearing component 324 and the frame layer 3211 via multiple second frame connecting rods 3232. This further enhances the connection strength of the heating mounting rod 3221, making the support of the heating mounting rod 3221 for the heating component 31 more stable. Since the middle frame layer 3211 is not provided with second frame connecting rods 3232, the heating component 31 can enter the assembly device 32 through adjacent frame layers 3211, simplifying the installation of the heating component 31.

[0095] In some embodiments, the number of heating mounting rods 3221 can be four, with the four heating mounting rods 3221 arranged in pairs opposite each other. Each pair of heating mounting rods 3221 is connected to the same first connecting rod 32111 of each frame layer 3211 via a first frame connecting rod 3231. The distance between two heating mounting rods 3221 connected to the same first connecting rod 32111 (i.e., first heating mounting rods) is less than the distance between two heating mounting rods 3221 connected to different first connecting rods 32111 (i.e., second heating mounting rods). In this embodiment, the installation stability of the heating assembly 31 can be improved, and it also facilitates entry into the frame body 321 from the space between two second heating mounting rods when the heating assembly 31 is installed on the heating mounting rods 3221.

[0096] In some embodiments, the insulating support assembly 324 may include a support limiting member 3241 and an insulating member 3242; the insulating member 3242 is disposed between the support limiting member 3241 and the frame body 321 for insulating the frame body 321 from the support limiting member 3241; the support limiting member 3241 is configured to provide limiting for the heating mounting assembly 322 and to support the sodium purification cold trap 60. In this embodiment, the load-bearing limiting member 3241 can provide support for the sodium purification cold trap 60 and limit the heating mounting assembly 322, so that the sodium purification cold trap 60 can be stably supported, and the connection between the heating mounting assembly 322 and the frame body 321 and the load-bearing limiting member 3241 is tighter and more stable; at the same time, the insulating member 3242 is located between the load-bearing limiting member 3241 and the frame body 321, so that when the sodium purification cold trap 60 is installed on the load-bearing limiting member 3241, a closed conductive circuit will not be formed between it and the frame body 321, thus preventing the frame body 321 and the mounting flange of the sodium purification cold trap 60 from being heated.

[0097] In some embodiments, the bearing limiting member 3241 can be a plate, which forms a lifting hole 32411 for lifting the sodium purification cold trap 60 and a limiting groove 32412 for limiting the heating installation assembly 322, thereby facilitating the stability of the heating installation assembly 322 and improving the stability of the bearing limiting member 3241 in lifting the sodium purification cold trap 60.

[0098] In some embodiments, the plate body forms a limiting groove 32412 for limiting the heating mounting rod 3221 of the heating mounting assembly 322, and the first frame connecting rod 3231 located on the top layer can also provide support for the bearing limiting member 3241, thereby facilitating both the stability of the heating mounting rod 3221 and improving the stability of the bearing limiting member 3241.

[0099] In some embodiments, multiple heating components 31 are coaxially mounted on the heating mounting assembly 322 of the assembly device 32 along the axial direction of the coil 312 of the heating component 31. In such an embodiment, the number of heating components 31 can be selected and installed on the assembly device 32 according to the size of the sodium purification cold trap 60 before heating, so that the heating device 30 can adapt to different axial lengths of the sodium purification cold trap 60 when heating the sodium purification cold trap 60, which is convenient for heating sodium purification cold traps 60 of various sizes. At the same time, the assembly device 32 is not heated by the heating components 31, which makes the structural stability of the assembly device 32 better and the heating device 30 more durable.

[0100] Embodiments of this application also provide a method for processing a sodium-purified cold trap, implemented using the processing system provided in any embodiment of this application.

[0101] In some embodiments, the processing method includes the following steps: S1, acquiring an image of the sodium purification cold trap 60 containing the central tube 63 using an image acquisition device 10; S2, determining the unblocking time of the central tube 63 of the sodium purification cold trap using a processor 70 based on the image determined in step S1; S3, heating the sodium purification cold trap 60 in segments from top to bottom in the height direction using a heating device 30, so that solid sodium melts to form liquid sodium and some impurities can dissolve in the liquid sodium; S4, unblocking the central tube 63 of the sodium purification cold trap 60 using an air filling and pumping device 50 and an ultrasonic vibration device 20 based on the unblocking time determined in step S2; S5, cooling the sodium purification cold trap 60, so that the liquid sodium solidifies and the impurities are deposited below the central tube 63; S6, acquiring another image of the sodium purification cold trap 60 containing the central tube 63 using the image acquisition device 10, and determining the impurity processing status using a processor 70 based on the images acquired in step S1 and step S6.

[0102] In this embodiment, the image acquisition device 10 acquires an image of the central tube 63 of the sodium purification cold trap 60 to determine the unblocking time of the central tube 63. This facilitates continuous unblocking of the central tube 63 and avoids frequent interruptions in unblocking operations due to insufficient unblocking time, which would prolong the final unblocking time. After unblocking the central tube 63, the sodium purification cold trap 60 is cooled to allow impurities to deposit below the central tube 63, preventing impurities from re-entering the central tube 63 and causing blockage. The images obtained by the image acquisition device 10 before and after unblocking are used to determine the impurity treatment status, which helps to accurately determine whether the central tube 63 has been unblocked. By processing the sodium purification cold trap 60, this embodiment can extend the service life of the sodium purification cold trap 60 and prevent the sodium purification cold trap 60 from being discarded before the flow channel of the wire mesh 68 in the collection area is blocked and the design value for impurity collection in the collection area is reached.

[0103] In some embodiments, step S3 may include: S310, determining the axial length of the sodium purification cold trap 60; S320, determining the number of heating components 31 according to the axial length; S330, assembling the number of heating components 31 determined in step S320 onto the assembly device 32; S340, assembling the sodium purification cold trap 60 onto the assembly device 32 and positioning the sodium purification cold trap 60 radially inside the insulation member 311 of each heating component 31; S350, determining the heating sequence of each heating component 31 according to the internal working fluid distribution of the sodium purification cold trap 60; S360, controlling each heating component 31 to heat according to the heating sequence.

[0104] In such an embodiment, a suitable number of heating components 31 can be assembled along the axial direction of the sodium purification cold trap 60. Since the heating sequence of each heating component 31 is determined according to the distribution of the working fluid inside the sodium purification cold trap 60, equipment damage caused by volume expansion when the working fluid melts due to insufficient space can be avoided.

[0105] In some embodiments, the image acquisition device 10 may acquire images using ultrasound or X-rays.

[0106] In some embodiments, the image acquisition device 10 can be used to acquire an image of the device to be heated, thereby determining the distribution of the working fluid inside the sodium purification cold trap 60.

[0107] The following description, in conjunction with the accompanying drawings, illustrates the method for processing a sodium purification cold trap using the processing system of this application.

[0108] See Figure 2 First, the image acquisition device 10 is used to acquire an image of the central tube 63 inside the sodium purification cold trap 60. Based on the image determined by the image acquisition device 10, the time required to clear the central tube 63 of the sodium purification cold trap 60 is determined.

[0109] The sodium purification cold trap 60 is evacuated and purged with argon gas until the oxygen concentration in the argon atmosphere inside the sodium purification cold trap 60 is below 50 PPM. Then, the sodium purification cold trap 60 is heated using the heating device 30 to melt the solid sodium and dissolve some impurities in the sodium. Specifically, based on the image acquired by the image acquisition device 10, the distribution and quantity of solid sodium inside the sodium purification cold trap 60 are determined, the required volume of the buffer container 40 and the heating sequence of the heating components 31 of the heating device 30 are determined, and the buffer container 40 and the gas filling and evacuation device 50 are connected to the sodium purification cold trap 60. The sodium purification cold trap 60 is then heated according to the heating sequence. The upper end cap 64 of the sodium purification cold trap 60 is heated to the first target temperature; the first section of the straight cylindrical section 65 of the sodium purification cold trap 60, divided from top to bottom, is heated to the first target temperature, while the upper end cap 64 is heated to its final target temperature; the second section of the straight cylindrical section 65 of the sodium purification cold trap 60, divided from top to bottom, is heated to the first target temperature, while the part above the second section is heated to increase its temperature by ΔT, until each part reaches its respective final target temperature.

[0110] Specifically, during heating, the buffer container 40, steam trap 53, pipeline, and the upper end cap 64 of the sodium purification cold trap 60 are preheated until the temperature of the upper end cap 64 reaches 100℃ and stabilizes. Then, the first section of the straight cylinder 65 is heated from top to bottom, with a target temperature of 100℃ and a heating rate controlled at 30℃ / h; the buffer container 40, steam trap 53, pipeline, and the upper end cap 64 of the sodium purification cold trap 60 continue to be heated, with a target temperature of 200℃. After the first section of the straight cylinder 65 reaches the target temperature of 100℃ and stabilizes, the second section of the straight cylinder 65 is heated from top to bottom, with a target temperature of 100℃ and a heating rate controlled at 30℃ / h; the target temperature of the first section of the straight cylinder 65 is adjusted to 150℃, and the heating rate is still controlled at 30℃ / h. This process continues until the bottom end cap 66 reaches a heating temperature of 100℃ and stabilizes. Then, continue to increase the temperature of the straight section 65 at a rate of 30℃ / h until the overall temperature of the straight section 65 of the sodium purification cold trap 60 reaches 400℃ and stabilizes. During the heating process, ensure that the pressure in the gas chamber of the upper end cap 64 of the sodium purification cold trap 60 does not exceed the design pressure of the sodium purification cold trap 60. When the pressure approaches the design pressure or is too high, exhaust gas through the steam trap 53 connected to the sodium inlet pipe 61 until the pressure returns to the normal value.

[0111] According to the time determined in the aforementioned steps, the central tube 63 of the sodium purification cold trap 60 is cleared. Ultrasonic vibration device 20 is used to provide ultrasonic waves to the central tube 63 of the sodium purification cold trap 60 to dislodge impurities from the central tube 63. A vacuum pumping device 50 is used to evacuate the sodium purification cold trap 60 through two buffer containers 40 and to supply inert gas. The ultrasonic vibration device 20 and the vacuum pumping device 50 are used alternately to dislodge impurities from the central tube 63 and dissolve them in liquid sodium.

[0112] When the flow rates of inert gas entering and exiting the central tube 63 are basically the same, and the time for clearing the central tube 63 of the sodium purification cold trap 60 reaches the time for clearing the central tube 63 of the sodium purification cold trap 60 determined in the aforementioned steps, heating of the sodium purification cold trap 60 is stopped, so that the cooling rate of the bottom end cap 66 of the sodium purification cold trap 60 is greater than the cooling rate of other parts of the sodium purification cold trap 60, thereby causing impurities to precipitate and deposit below the central tube 63.

[0113] The image acquisition device 10 is used again to acquire an image of the sodium purification cold trap 60 containing the central tube 63. Based on the first acquired image and the current acquired image, the status of impurity treatment is determined. Based on the status of impurity treatment, it is determined whether further unblocking is necessary until the unblocked sodium purification cold trap 60 can be reused.

[0114] Regarding the embodiments of this application, it should also be noted that, without conflict, the embodiments of this application and the features in the embodiments can be combined with each other to obtain new embodiments.

[0115] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. The scope of protection of this application shall be determined by the scope of the claims.

Claims

1. A method for treating a sodium-purified cold trap, characterized in that, Includes the following steps: S10. Obtain an image of the central tube inside the sodium purification cold trap; S20. Based on the image determined in step S10, determine the unblocking time for the central tube of the sodium purification cold trap. S30. The sodium purification cold trap is heated to melt solid sodium into liquid sodium and to dissolve some impurities in the liquid sodium; S40. According to the unblocking time determined in step S20, unblock the central tube of the sodium purification cold trap. S50. Cool the sodium purification cold trap to solidify the liquid sodium and deposit impurities below the central tube. S60. Obtain an image of the central tube inside the sodium purification cold trap again. Based on the images obtained in step S10 and step S60, determine the processing status of the impurities.

2. The processing method according to claim 1, characterized in that, Step S20 includes: S21. Based on the image obtained in step S10, determine the blockage status of the central tube of the sodium purification cold trap; S22. Determine the unblocking time based on the blockage status.

3. The processing method according to claim 1, characterized in that, Step S40 includes: S41. Backflush the central tube with inert gas.

4. The processing method according to claim 3, characterized in that, Step S40 includes: S42. Use ultrasound to vibrate the solid impurities remaining in the central tube so that they are removed from the central tube.

5. The processing method according to claim 4, characterized in that, In step S40, steps S41 and S42 are repeated alternately.

6. The processing method according to claim 5, characterized in that, In step S40, when the flow rates of the inert gas entering and exiting the central tube in step S41 are substantially the same, and the time for clearing the central tube of the sodium purification cold trap reaches the clearing time determined in step S20, step S50 is executed.

7. The processing method according to claim 5, characterized in that, In steps S30 and S41, the gas pressure inside the sodium purification cold trap is detected and maintained within a preset range.

8. The processing method according to claim 1, characterized in that, Step S30 includes: S31. Heat the upper end cap of the sodium purification cold trap to the first target temperature; S32. The first section of the straight cylindrical section of the sodium purification cold trap, divided from top to bottom, is heated to the first target temperature, while the upper end cap is heated to its final target temperature. S33. The second section of the straight cylindrical section of the sodium purification cold trap, divided from top to bottom, is heated to the first target temperature. At the same time, the part above the second section is heated to increase its temperature by ΔT until each part reaches its respective final target temperature.

9. The processing method according to claim 1, characterized in that, The S50 steps include: S51. Stop heating the sodium purification cold trap; S52. The cooling rate of the bottom end cap of the sodium purification cold trap is greater than the cooling rate of other parts of the sodium purification cold trap, so that the impurities precipitate and deposit below the central tube.

10. The processing method according to any one of claims 1-9, characterized in that, Following step S60 are: If the central tube of the sodium purification cold trap is not completely cleared, repeat steps S10-S60 until the central tube is basically cleared.

11. A treatment system for a sodium purification cold trap, characterized in that, The processing system includes: The image acquisition device is configured to acquire an image of the central tube inside the sodium purification cold trap; The heating device is configured to heat the sodium purification cold trap in segments from top to bottom in the height direction, so as to melt the solid sodium in the sodium purification cold trap into liquid sodium and to dissolve some impurities in the liquid sodium. Two buffer containers are connected to the sodium inlet pipe and sodium outlet pipe of the sodium purification cold trap, respectively, to prevent liquid sodium from overflowing from the sodium purification cold trap. An ultrasonic vibration device is configured to provide ultrasonic waves to the central tube of the sodium purification cold trap in order to use the ultrasonic waves to remove impurities from the central tube. The air filling and pumping device is configured to evacuate the sodium purification cold trap and deliver inert gas through the two buffer containers, and to use the inert gas to backwash the central tube. The processor is configured to determine the unblocking time of the central tube of the sodium purification cold trap and the treatment status of the impurities based on the images acquired by the image acquisition device.

12. The processing system according to claim 11, characterized in that, The heating device includes: multiple heating components and an assembly device. The plurality of heating components are arranged coaxially; Each of the heating components is configured to avoid interfering with the coils of adjacent heating components; The assembly device is configured to connect to the insulating mounting assembly of each of the heating components and to suspend the sodium purification cold trap on the radially inner side of the insulation of each of the heating components.

13. The processing system according to claim 12, characterized in that, The heating component includes: An insulation component, wherein the insulation component is configured to insulate the sodium purification cold trap; A coil is disposed on the radial outer side of the insulation component and is configured to perform high-frequency heating of the sodium purification cold trap through electromagnetic induction. Two shielding components are configured to electromagnetically shield the coil on both sides of its axial direction and to prevent it from being heated by the coil. An insulating mounting assembly for insulatedly assembling the coil, the insulation, and the shielding assembly together, and for detachably connecting to an assembly for supporting the sodium purification cold trap.

14. A method for treating a sodium-purified cold trap, characterized in that, Implemented using the processing system according to any one of claims 11-13.

15. The processing method according to claim 14, characterized in that, Includes the following steps: S1. Use the image acquisition device to acquire an image of the central tube inside the sodium purification cold trap; S2. Using the processor based on the image determined in step S1, determine the unblocking time for the central tube of the sodium purification cold trap. S3. The sodium purification cold trap is heated in segments from top to bottom in the height direction using the heating device, so that the solid sodium melts to form liquid sodium and some impurities can be dissolved in the liquid sodium. S4. Based on the unblocking time determined in step S2, the central tube of the sodium purification cold trap is unblocked using the air-inflating and air-extraction device and the ultrasonic vibration device. S5. Cool the sodium purification cold trap to solidify the liquid sodium and deposit impurities below the central tube. S6. Using the image acquisition device, acquire an image of the central tube inside the sodium purification cold trap. Using the processor, determine the processing status of the impurities based on the images acquired in step S1 and step S6.

Images