Method of treating sodium-potassium alloy chamber of sodium purification cold trap and apparatus therefor

Abstract

Embodiments of the present application relate to the field of cold traps for nuclear reactors, and particularly to a method for treating a sodium-potassium alloy chamber of a sodium purification cold trap and a device thereof. Embodiments of the present application achieve the following effects by vacuumizing the sodium-potassium alloy chamber to a pressure of the sodium-potassium alloy chamber reaching a preset pressure, so that the atmosphere therein meets the environment for superoxide decomposition, avoiding superoxide explosion; heating to decompose the superoxide and remove oxygen, avoiding the sodium-potassium alloy in the sodium-potassium alloy chamber reacting with oxygen to generate an explosion; continuing to heat after the superoxide is completely decomposed to evaporate the sodium-potassium alloy, removing the sodium-potassium alloy vapor and condensing to obtain sodium-potassium alloy liquid, so that the sodium-potassium alloy can be transferred out of the sodium-potassium alloy chamber and recycled; filling the sodium-potassium alloy chamber with inert gas and cooling the sodium-potassium alloy chamber under the condition of maintaining the positive pressure of the sodium-potassium alloy chamber, so that the sodium-potassium alloy chamber treatment is completed.

Description

Technical Field

[0001] Embodiments of this application relate to the field of cold traps for nuclear reactors, and more specifically to a method and apparatus for treating a sodium-potassium alloy chamber of a sodium-purified cold trap. 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] The sodium purification cold trap is a device used in sodium-cooled fast reactors to purify liquid sodium, the coolant in the primary loop. The cooling section of the sodium purification cold trap cools the collection net in the cold trap body, so that impurities in the liquid sodium condense and precipitate in the collection net and are captured by the collection net, thereby purifying the sodium.

[0004] Sodium-purified cold traps need to be disposed of as radioactive waste after they fail, and there are currently safety hazards in the disposal of sodium-purified cold traps. Summary of the Invention

[0005] 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.

[0006] In a first aspect, embodiments of this application provide a method for processing the sodium-potassium alloy chamber of a sodium purification cold trap, comprising the following steps: S10, evacuating the sodium-potassium alloy chamber until the pressure in the sodium-potassium alloy chamber reaches a preset pressure; S20, heating the sodium-potassium alloy chamber to a first preset temperature to decompose the superoxide in the sodium-potassium alloy into oxides and oxygen, and continuously evacuating the sodium-potassium alloy chamber to remove the oxygen formed by decomposition; S30, after the superoxide has completely decomposed and the oxygen has been completely removed, raising the temperature of the sodium-potassium alloy chamber to a second preset temperature to evaporate the sodium-potassium alloy, and continuously evacuating the sodium-potassium alloy chamber to remove the sodium-potassium vapor formed by evaporation; condensing the removed sodium-potassium vapor and collecting the condensed sodium-potassium alloy liquid; S40, after all the sodium-potassium alloy has formed sodium-potassium vapor and has been completely removed, filling the sodium-potassium alloy chamber with inert gas, and cooling the sodium-potassium alloy chamber while maintaining a positive pressure.

[0007] The embodiments of this application reduce water vapor in the sodium-potassium alloy chamber by evacuating it, thus creating an atmosphere suitable for superoxide decomposition and preventing superoxide explosion. The superoxide is first decomposed under vacuum while oxygen is continuously removed, preventing further reaction between the sodium-potassium alloy and oxygen to generate more superoxide. After complete decomposition and oxygen removal, the temperature is further increased to evaporate the sodium-potassium alloy. The vapor is then removed and condensed to obtain liquid sodium-potassium alloy, allowing it to be transferred out of the chamber and recovered. Filling the chamber with inert gas and cooling it further improves the cooling rate and prevents residual sodium-potassium alloy from reacting with water vapor.

[0008] Since the decomposition temperature of superoxide is lower than the evaporation temperature of sodium-potassium alloy, the embodiments of this application can safely remove sodium-potassium alloy and superoxide by first decomposing superoxide in a vacuum environment and at a lower temperature, continuously removing oxygen, and then increasing the temperature after removing oxygen to evaporate sodium-potassium alloy.

[0009] Secondly, embodiments of this application provide an apparatus for processing the sodium-potassium alloy chamber of a sodium purification cold trap, comprising: a heating element, a condensing element, a collecting element, a gas filling element, a sodium-potassium vapor trap, a vacuuming element, and a processing element; the heating element is configured to heat the sodium-potassium alloy chamber to decompose the superoxide in the chamber into oxygen and oxides and to evaporate the sodium-potassium alloy to form sodium-potassium vapor; the condensing element is in fluid communication with the sodium-potassium alloy chamber, the collecting element is in fluid communication with the condensing element, and the sodium-potassium vapor trap is in fluid communication with the collecting element; the vacuuming element is configured to evacuate the sodium-potassium vapor trap to allow the gas in the sodium-potassium alloy chamber to... The gas flows sequentially through a condenser, a collector, and a sodium-potassium vapor trap. The condenser is configured to condense the sodium-potassium vapor extracted from the sodium-potassium alloy chamber. The collector is configured to collect the condensed sodium-potassium alloy liquid. The gas supply unit is configured to supply inert gas to the sodium-potassium alloy chamber after the sodium-potassium alloy is extracted, so as to keep the sodium-potassium alloy chamber under positive pressure. The pressure measuring unit is used to measure the pressure of the sodium-potassium alloy chamber. The temperature measuring unit is used to measure the temperature of the pipeline connecting the sodium-potassium alloy chamber and the condenser. The processing unit determines the superoxide decomposition and sodium-potassium alloy evaporation based on the temperature change of the pipeline and the pressure change of the sodium-potassium alloy chamber.

[0010] The embodiments of this application determine the pressure of the sodium-potassium alloy chamber by setting a pressure measuring device. A vacuuming device evacuates the sodium-potassium alloy chamber according to the pressure determined by the pressure measuring device, reducing water vapor in the chamber and creating an atmosphere suitable for superoxide decomposition, thus preventing the sodium-potassium alloy in the chamber from reacting with oxygen and causing an explosion. A heating device heats the sodium-potassium alloy chamber according to the temperature measured by the temperature measuring device, causing the superoxide to decompose, and the vacuuming device removes oxygen, preventing the sodium-potassium alloy in the chamber from reacting with oxygen and causing an explosion. When the superoxide is completely decomposed, and After oxygen is removed, the temperature continues to rise, causing the sodium-potassium alloy to evaporate. A vacuum pump is used to remove the sodium-potassium alloy vapor, and a vapor trap is installed to prevent the vapor from entering the vacuum pump. A condenser is used to condense the extracted vapor, obtaining a liquid sodium-potassium alloy, which can then be transferred out of the sodium-potassium alloy chamber and recovered by a collector. A temperature sensor measures the temperature change in the first pipeline, and based on this temperature change and the pressure change in the sodium-potassium alloy chamber, the decomposition of superoxide and the evaporation of the sodium-potassium alloy are determined, thus completing the treatment of the sodium-potassium alloy chamber. An inert gas is then introduced into the sodium-potassium alloy chamber using a gas filling device, which further accelerates the cooling process and prevents any remaining sodium-potassium alloy from reacting with water vapor. Attached Figure Description

[0011] 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.

[0012] Figure 1 This is a schematic diagram of the device for treating the sodium-potassium alloy chamber of a sodium purification cold trap, according to an embodiment of this application.

[0013] 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.

[0014] Explanation of reference numerals in the attached figures: 10. Sodium purification cold trap; 11. Cold trap body; 12. Cooling section; 120. Sodium-potassium alloy chamber; 20. Condensation component; 30. Collection component; 40. Sodium-potassium vapor trap; 50. Vacuum extraction component; 61. First pipeline; 62. Second pipeline; 63. Third pipeline. Detailed Implementation

[0015] 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.

[0016] 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.

[0017] The cooling section of a sodium-purified cold trap forms a sodium-potassium alloy chamber, through which the flowing sodium-potassium alloy cools the trap's internal mesh. If the sodium-purified cold trap fails, the residual sodium-potassium alloy in the chamber may react with oxygen in the air due to the loss of positive pressure, generating superoxide (NaO2 / KO2). These superoxides are highly susceptible to explosion upon mechanical stimulation (friction or impact), contact with high-humidity air, acids, or reducing agents. Therefore, safely discharging the sodium-potassium alloy from the cooling section and removing the superoxide remains a pressing problem.

[0018] To address the aforementioned problems, embodiments of this application provide a method for processing the sodium-potassium alloy chamber of a sodium purification cold trap (hereinafter referred to as the processing method). The processing method includes the following steps: S10, evacuating the sodium-potassium alloy chamber until the pressure in the chamber reaches a preset pressure; S20, heating the sodium-potassium alloy chamber to a first preset temperature to decompose the superoxide in the sodium-potassium alloy into oxides and oxygen, and continuously evacuating the chamber to remove the oxygen formed during decomposition; S30, after the superoxide has completely decomposed and the oxygen has been completely removed, raising the temperature of the sodium-potassium alloy chamber to a second preset temperature to cause the sodium-potassium alloy to evaporate, and continuously evacuating the chamber to remove the sodium-potassium vapor formed during evaporation; condensing the removed sodium-potassium vapor and collecting the condensed sodium-potassium alloy liquid; S40, after all sodium-potassium alloy has formed sodium-potassium vapor and been completely removed, filling the sodium-potassium alloy chamber with inert gas, and cooling the chamber while maintaining a positive pressure.

[0019] The embodiments of this application reduce water vapor in the sodium-potassium alloy chamber by evacuating it, thus creating an atmosphere suitable for superoxide decomposition and preventing superoxide explosion. First, superoxide is decomposed under vacuum while oxygen is continuously removed, preventing the sodium-potassium alloy in the chamber from reacting with oxygen and causing an explosion. After the superoxide is completely decomposed and oxygen is removed, the temperature is further increased to evaporate the sodium-potassium alloy. The vapor is then removed and condensed to obtain liquid sodium-potassium alloy, allowing it to be transferred out of the chamber and recovered. Filling the chamber with inert gas and cooling it further improves the cooling rate of the sodium-potassium alloy and prevents residual sodium-potassium alloy from reacting with water vapor.

[0020] Since the decomposition temperature of superoxide is lower than the evaporation temperature of sodium-potassium alloy, the embodiments of this application first decompose the superoxide in a vacuum environment and at a lower temperature, continuously remove oxygen, and then increase the temperature after removing the oxygen to evaporate the sodium-potassium alloy. This can safely remove the sodium-potassium alloy and superoxide, and significantly reduce the risk of explosion that may be caused by direct discharge of sodium-potassium alloy from the sodium-potassium alloy chamber of the decommissioned sodium purification cold trap.

[0021] See Figure 1 , Figure 1 This is a schematic diagram of the apparatus for processing the sodium-potassium alloy chamber of a sodium purification cold trap according to an embodiment of this application. The cooling section 12 of the sodium purification cold trap 10 forms a sodium-potassium alloy chamber 120, through which the flowing sodium-potassium alloy cools the trapping mesh in the cold trap body 11. When the sodium purification cold trap 10 is discarded, the sodium-potassium alloy chamber 120 contains sodium-potassium alloy and superoxide.

[0022] In some embodiments, step S10 may include the following steps: S11, installing a condenser 20 in fluid communication with the sodium-potassium alloy chamber 120, a collector 30 in fluid communication with the condenser 20, a sodium-potassium vapor trap 40 in fluid communication with the collector 30, and a vacuum pump 50 in fluid communication with the sodium-potassium vapor trap 40; S12, evacuating the sodium-potassium alloy chamber 120 using the vacuum pump 50. In such an embodiment, the sodium-potassium alloy chamber 120 can be evacuated using the vacuum pump 50, while simultaneously removing oxygen. Furthermore, during the evaporation of the sodium-potassium alloy, the sodium-potassium alloy vapor can be condensed into a liquid as it flows through the condenser 20 and collected after entering the collector 30.

[0023] Specifically, the sodium-potassium alloy chamber 120 is connected to the condenser 20 via a first pipe 61; the condenser 20 is connected to the collector 30 via a second pipe 62; and the collector 30 is connected to the sodium-potassium vapor trap 40 and the vacuum pump 50 via a third pipe 63.

[0024] In some embodiments, the step of installing the condenser 20 in fluid communication with the sodium-potassium alloy chamber 120 in step S11 may include: S111, determining an available interface in the sodium-potassium alloy chamber 120; S112, connecting the interface to the condenser 20 in an inert gas environment. In such embodiments, when the sodium-potassium alloy chamber 120 has an available interface, the existing interface is directly used to connect the first pipeline 61, thereby achieving connection with the condenser 20, without having to open an additional interface on the sodium-potassium alloy chamber 120, thus avoiding the risk of explosion of superoxide in the sodium-potassium alloy chamber 120 that might be increased by additional openings.

[0025] In some embodiments, step S111 may include the following steps: S1111, determining the location of the interface and determining whether there are any residues in the interface; S1112, determining the usable interface of the sodium-potassium alloy chamber 120 based on the location of the interface and whether there are any residues in the interface. In such an embodiment, determining the usable interface of the sodium-potassium alloy chamber 120 based on the location of the interface and whether there are any residues in the interface makes subsequent vacuuming and heating of the sodium-potassium alloy chamber 120 safer, avoiding explosions of superoxide and sodium-potassium alloy in the sodium-potassium alloy chamber 120.

[0026] In some embodiments, step S1112 may include the following step: if the existing interface of the sodium-potassium alloy chamber 120 is located below the liquid surface or contains residue, an opening is formed in the top of the sodium-potassium alloy chamber 120 as a usable interface under an inert gas environment. In such embodiments, when the existing interface is located below the liquid surface or contains residue, the existing interface is avoided to prevent the explosion of superoxide or sodium-potassium alloy. The top of the sodium-potassium alloy chamber 120 is typically a gas chamber, and an opening at the top is safer.

[0027] In some embodiments, if the existing interface of the sodium-potassium alloy chamber 120 is located above the liquid surface and there is no residue in the interface, then the existing interface is determined to be a usable interface of the sodium-potassium alloy chamber 120.

[0028] In some embodiments, in step S20, the sodium-potassium alloy chamber 120 can be heated to a first preset temperature at a preset heating rate, so that the sodium-potassium alloy chamber 120 is heated slowly, allowing the superoxide in the sodium-potassium alloy chamber 120 to decompose safely and avoid explosion.

[0029] In some embodiments, the first preset temperature can be 250°C, and the preset heating rate can be no more than 30°C / h.

[0030] In some embodiments, in step S10, the sodium-potassium alloy chamber is evacuated until the pressure in the sodium-potassium alloy chamber reaches below 1 Pa of a preset pressure.

[0031] In some embodiments, step S30 may include the following steps: S31, determining that the superoxide has completely decomposed and the oxygen has been completely removed based on the pressure change within the sodium-potassium alloy chamber 120; S32, continuing to heat the sodium-potassium alloy chamber 120 at a preset heating rate to a second preset temperature. When the superoxide is not completely decomposed, the continuous decomposition of the superoxide will continuously generate oxygen, causing the pressure within the sodium-potassium alloy chamber 120 to be greater than the pressure within the sodium-potassium alloy chamber 120 after the superoxide has completely decomposed. The embodiments of this application determine the degree of superoxide decomposition by measuring the pressure change within the sodium-potassium alloy chamber 120, accurately determining that the sodium-potassium alloy chamber 120 no longer contains undecomposed superoxide and oxygen, and subsequently heating the sodium-potassium alloy chamber 120 to the second preset temperature so that the sodium-potassium alloy therein can be evaporated.

[0032] In some embodiments, in step S32, the sodium-potassium alloy chamber 120 can be heated to a second preset temperature at a preset heating rate, so that the sodium-potassium alloy chamber 120 is heated slowly, allowing the sodium-potassium alloy in the sodium-potassium alloy chamber 120 to evaporate safely and avoid explosion.

[0033] In some embodiments, the second preset temperature can be 550°C, and the preset heating rate can be no more than 30°C / h.

[0034] In some embodiments, when the pressure in the sodium-potassium alloy chamber 120 is lower than a preset pressure in step S30, the temperature of the sodium-potassium alloy chamber 120 can be increased according to the partial pressure of sodium and potassium vapor. In such embodiments, when the pressure in the sodium-potassium alloy chamber 120 is insufficient, the sodium-potassium alloy can be evaporated by increasing the temperature to achieve distillation of the sodium-potassium alloy.

[0035] In some embodiments, step S40 includes the following steps: S41, determining, based on the temperature change of the first pipe 61 used to connect the sodium-potassium alloy chamber 120 and the condenser 20, that all sodium-potassium alloy has formed sodium-potassium vapor and has been completely removed; S42, stopping heating of the sodium-potassium alloy chamber 120 and slowly reducing the vacuum level of the sodium-potassium alloy chamber 120; S43, filling the sodium-potassium alloy chamber 120 with inert gas to bring the sodium-potassium alloy chamber 120 under positive pressure. Before the sodium-potassium vapor enters the first pipe 61, the temperature of the first pipe 61 is relatively low. When the sodium-potassium vapor enters the first pipe 61, the sodium-potassium vapor condenses and releases a large amount of heat, causing the temperature of the first pipe 61 to rise significantly and remain at a high temperature. After all sodium-potassium alloy has formed sodium-potassium vapor and has been completely removed, the temperature of the first pipe 61 drops significantly, essentially returning to the temperature of the first pipe 61 before the sodium-potassium vapor entered the first pipe 61. The embodiments of this application can accurately determine the extent to which the sodium-potassium alloy is transferred out of the sodium-potassium alloy chamber 120 by based on the temperature change of the first pipeline 61.

[0036] Embodiments of this application also provide an apparatus (hereinafter referred to as the processing apparatus) for processing the sodium-potassium alloy chamber 120 of a sodium purification cold trap. The processing apparatus can be used to implement the methods of any embodiment of this application.

[0037] See Figure 1 The processing device may include: a heating element, a condenser 20, a collector 30, a sodium-potassium vapor trap 40, a gas filling element, a pressure measuring element, a temperature measuring element, a vacuuming element 50, and a processing element; the heating element is configured to heat the sodium-potassium alloy chamber 120 to decompose the superoxide in the sodium-potassium alloy chamber 120 to form oxygen and oxides, and to evaporate the sodium-potassium alloy to form sodium-potassium vapor; the condenser 20 is in fluid communication with the sodium-potassium alloy chamber 120, the collector 30 is in fluid communication with the condenser 20, and the sodium-potassium vapor trap 40 is in fluid communication with the collector 30; the vacuuming element 50 is configured to evacuate the sodium-potassium vapor trap 40 so that the gas in the sodium-potassium alloy chamber 120 can flow sequentially through the condenser 20 and the collector 30. The system includes a sodium-potassium vapor trap 40 and a condenser 20 configured to condense sodium-potassium vapor extracted from the sodium-potassium alloy chamber 120; a collector 30 configured to collect the sodium-potassium alloy liquid condensed by the condenser 20; an aeration unit configured to supply inert gas to the sodium-potassium alloy chamber 120 after the sodium-potassium alloy is extracted, so that the sodium-potassium alloy chamber 120 is in a positive pressure environment; a pressure measuring unit for measuring the pressure of the sodium-potassium alloy chamber 120; a temperature measuring unit for measuring the temperature of the first pipeline 61 connecting the sodium-potassium alloy chamber 120 and the condenser 20; and a processing unit for determining the superoxide decomposition and sodium-potassium alloy evaporation based on the temperature change of the first pipeline 61 and the pressure change of the sodium-potassium alloy chamber 120.

[0038] In this embodiment, the pressure of the sodium-potassium alloy chamber 120 is determined by a pressure measuring device. The vacuuming device 50 evacuates the sodium-potassium alloy chamber 120 according to the pressure determined by the pressure measuring device, reducing water vapor in the chamber and creating an atmosphere suitable for superoxide decomposition, thus preventing the sodium-potassium alloy in the chamber from reacting with oxygen and causing an explosion. The heating device heats the sodium-potassium alloy chamber 120 according to the temperature measured by the temperature measuring device, causing the superoxide to decompose. The vacuuming device 50 then removes oxygen, preventing the sodium-potassium alloy in the chamber 120 from reacting with oxygen and causing an explosion. Once the superoxide has completely decomposed and the oxygen... After being extracted, the sodium-potassium alloy continues to evaporate. The sodium-potassium alloy vapor is extracted using a vacuum pump 50, and a sodium-potassium vapor trap 40 is installed to prevent the vapor from entering the vacuum pump 50. The extracted vapor is condensed using a condenser 20 to obtain liquid sodium-potassium alloy, allowing it to be transferred out of the sodium-potassium alloy chamber 120 and recovered by a collector 30. A temperature sensor measures the temperature change in the first pipeline 61, and based on the temperature change in the first pipeline 61 and the pressure change in the sodium-potassium alloy chamber 120, the superoxide decomposition and evaporation of the sodium-potassium alloy are determined, thus completing the processing of the sodium-potassium alloy chamber 120. An inert gas is then introduced into the sodium-potassium alloy chamber 120 using a gas filling device to lower the temperature, which improves the cooling rate of the sodium-potassium alloy and prevents the residual sodium-potassium alloy from reacting with water vapor.

[0039] In some embodiments, the sodium-potassium alloy chamber 120 may share a pressure measuring element with the vacuum pump 50.

[0040] In some embodiments, the condenser 20 may be located at the top of the sodium-potassium alloy chamber 120, with its bottom inlet in fluid communication with the chamber and its side outlet in fluid communication with the collector 30. In such an embodiment, sodium-potassium alloy vapor rises in the chamber 120, enters the condenser 20, is condensed into liquid sodium-potassium alloy, and flows into the collector 30, thereby achieving the recovery of the sodium-potassium alloy.

[0041] In some embodiments, the condenser 20 is higher than the collector 30, so that the condensed sodium-potassium alloy liquid enters the collector 30 through the second pipe 62 under the action of gravity.

[0042] 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.

[0043] 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 the sodium-potassium alloy chamber of a sodium purification cold trap, characterized in that, Includes the following steps: S10. Evacuate the sodium-potassium alloy chamber until the pressure in the sodium-potassium alloy chamber reaches the preset pressure; S20. The sodium-potassium alloy chamber is heated to a first preset temperature so that the superoxide in the sodium-potassium alloy decomposes into oxides and oxygen, and the sodium-potassium alloy chamber is continuously evacuated so that the oxygen formed by decomposition is removed. S30. After the superoxide is completely decomposed and the oxygen is completely removed, the temperature of the sodium-potassium alloy chamber is raised to a second preset temperature to make the sodium-potassium alloy evaporate, and the sodium-potassium alloy chamber is continuously evacuated to remove the sodium-potassium vapor formed by evaporation; the removed sodium-potassium vapor is condensed and the condensed sodium-potassium alloy liquid is collected. S40. After the sodium-potassium alloy has completely formed sodium-potassium vapor and been completely extracted, inert gas is introduced into the sodium-potassium alloy chamber to cool the sodium-potassium alloy chamber while maintaining a positive pressure.

2. The method according to claim 1, characterized in that, Step S10 includes the following steps: S11. Install a condenser in fluid communication with the sodium-potassium alloy chamber, a collector in fluid communication with the condenser, a sodium-potassium vapor trap in fluid communication with the collector, and a vacuum device in fluid communication with the sodium-potassium vapor trap. S12. Vacuum the sodium-potassium alloy chamber using the vacuum pumping device.

3. The method according to claim 2, characterized in that, The step of installing the condenser in fluid communication with the sodium-potassium alloy chamber in step S11 includes: S111. Determine the available interfaces for the sodium-potassium alloy chamber; S112. In an inert gas environment, connect the interface to the condenser.

4. The method according to claim 3, characterized in that, Step S111 includes the following steps: S1111. Determine the location of the interface and determine whether there are any residues in the interface; S1112. Determine the usable interface of the sodium-potassium alloy chamber based on the location of the interface and whether there are any residues in the interface.

5. The method according to claim 4, characterized in that, Step S1112 includes the following steps: If the existing interface of the sodium-potassium alloy chamber is located below the liquid surface or there are residues in the interface, an opening is formed at the top of the sodium-potassium alloy chamber as a usable interface in an inert gas environment.

6. The method according to claim 1, characterized in that, In step S20, the sodium-potassium alloy chamber is heated to the first preset temperature at a preset heating rate.

7. The method according to claim 1, characterized in that, Step S30 includes the following steps: S31. Based on the pressure change within the sodium-potassium alloy chamber, it is determined that the superoxide has completely decomposed and the oxygen has been completely removed. S32, The sodium-potassium alloy chamber is heated to the second preset temperature at a preset heating rate.

8. The method according to claim 1, characterized in that, In step S30, when the pressure in the sodium-potassium alloy chamber is lower than the preset pressure, the temperature of the sodium-potassium alloy chamber is increased according to the partial pressure of sodium-potassium vapor.

9. The method according to any one of claims 1-8, characterized in that, Step S40 includes the following steps: S41. Based on the temperature change of the pipeline used to connect the sodium-potassium alloy chamber and the condenser, determine that the sodium-potassium alloy has completely formed sodium-potassium vapor and has been completely extracted. S42. Stop heating the sodium-potassium alloy chamber and slowly reduce the vacuum level of the sodium-potassium alloy chamber; S43. Inert gas is introduced into the sodium-potassium alloy chamber to make the sodium-potassium alloy chamber under positive pressure.

10. An apparatus for treating the sodium-potassium alloy chamber of a sodium purification cold trap, characterized in that, include: Heating components, condensing components, collecting components, sodium and potassium vapor traps, gas filling components, pressure measuring components, temperature measuring components, vacuuming components, and processing components; The heating element is configured to heat the sodium-potassium alloy chamber, so as to decompose the superoxide in the sodium-potassium alloy chamber to form oxygen and oxides, and to evaporate the sodium-potassium alloy to form sodium-potassium vapor. The condenser is in fluid communication with the sodium-potassium alloy chamber, the collector is in fluid communication with the condenser, and the sodium-potassium vapor trap is in fluid communication with the collector. The vacuum pumping component is configured to evacuate the sodium-potassium vapor trap so that the gas in the sodium-potassium alloy chamber can flow sequentially through the condenser, the collector, and the sodium-potassium vapor trap. The condenser is configured to condense the sodium-potassium vapor extracted from the sodium-potassium alloy chamber; The collecting component is configured to collect the sodium-potassium alloy liquid condensed by the condensing component. The inflation component is configured to supply inert gas into the sodium-potassium alloy chamber after the sodium-potassium alloy is extracted, so that the sodium-potassium alloy chamber is in a positive pressure environment. A pressure measuring element is used to measure the pressure in the sodium-potassium alloy chamber. A temperature sensing element is used to measure the temperature of the pipe connecting the sodium-potassium alloy chamber and the condenser. The processing unit is used to determine the superoxide decomposition and the sodium-potassium alloy evaporation based on the temperature changes of the pipeline and the pressure changes of the sodium-potassium alloy chamber.

11. The apparatus according to claim 10, characterized in that, The condenser is located at the top of the sodium-potassium alloy chamber, the bottom inlet of the condenser is in fluid communication with the sodium-potassium alloy chamber, and the side outlet of the condenser is in fluid communication with the collector.

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