Used as a coolant for liquid lead-bismuth alloys 210 Po's purification system and purification methods

Abstract

The present application relates to the technical field of purification equipment, and particularly relates to a purification system for liquid lead-bismuth alloy coolant 210 The present application relates to the technical field of purification equipment, and particularly relates to a purification system for liquid lead-bismuth alloy coolant 210 Po and its compounds in the lead-bismuth alloy, and improves the operation safety of the lead-bismuth cooled reactor and the lead-bismuth experimental loop.

Description

Technical Field

[0001] This invention relates to the field of purification equipment technology, and specifically to a coolant for liquid lead-bismuth alloys. 210 Purification system and purification method for Po. Background Technology

[0002] Lead-bismuth alloys are the preferred material for spallation targets (ADS) and coolants due to their low melting point, high boiling point, excellent neutron properties, chemical inertness, and good thermal conductivity; however, compared to pure lead (Pb), bismuth (Bi) in a combined blowing converter (LBE) will produce volatile polonium (BN) during service. 210 Therefore, the impact of nuclear energy systems on (Po) must be considered during operation. 210 Processing of Po.

[0003] Furthermore, similar to nuclear energy systems using liquid sodium as a coolant, LBE (Liquid Bismuth-Based Electricity) generates impurities such as corrosion and fission products during operation. These impurities significantly reduce the thermal conductivity and viscosity of the LBE, and their deposition on the pipe walls poses potential risks (such as blockage of heat exchanger channels and pipes), potentially affecting the safe operation of the nuclear energy system and leading to accidents like reactor shutdowns. However, because the impurities generated in LBE coolant differ in type and characteristics from those generated in liquid sodium coolant, the existing liquid sodium coolant purification system cannot be used to purify the lead-bismuth alloy coolant.

[0004] Furthermore, to mitigate the corrosive effect of LBE on pipelines, gaseous oxygen control technology (introducing a mixture of H2 / H2O into liquid LBE) is widely used to control the oxygen content in the LBE. This process generates volatile compounds such as PoOH and H2Po, threatening the safe operation of nuclear energy systems. Existing liquid metal purification devices are currently unable to effectively address this issue. 210 Effective purification of Po is crucial. Studies have shown that when using gaseous oxygen control technology to manage the oxygen content in liquid lead-bismuth alloys, the injected H2 and H2O lead to an increase in the gaseous concentration of Po, primarily due to the formation of H2Po. The presence of H2Po poses a potential risk to normal operation. Summary of the Invention

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the fact that existing liquid metal purification devices cannot effectively remove impurities. 210 This addresses the issue of effective purification of Po, thereby providing a coolant for liquid lead-bismuth alloys. 210 Po's purification system.

[0006] To address the aforementioned technical problems, this invention provides a polonium purification system for liquid lead-bismuth alloy coolant, comprising: a storage and heating tank containing liquid lead-bismuth alloy, with an inlet pipe and an outlet pipe at the top; a heating mechanism disposed within the storage and heating tank, used to raise the temperature of the liquid lead-bismuth alloy to facilitate the precipitation of gaseous products; a vapor-liquid separator disposed above the storage and heating tank, used to separate gaseous products; a filter assembly connected to the vapor-liquid separator, used to capture polonium and polonium compounds in the gaseous products; a cooling mechanism including a first cooling section and a second cooling section, the first cooling section being disposed between the storage and heating tank and the vapor-liquid separator, and the second cooling section being disposed between the filter assembly and the outlet pipe; and a reflux pipe connected to the second cooling section and the outlet pipe, with a gas diffusion nozzle disposed on the reflux pipe.

[0007] Furthermore, the steam-water separator includes a steam-water separation device and a collection device. The collection device is located below the steam-water separation device and is connected to the first cooling section. The steam-water separation device is connected to the filter assembly.

[0008] Furthermore, the vapor-water separation device includes: a cylinder, the bottom of which is provided with a receiving area; and two vapor-water separation baffles, which are arranged alternately.

[0009] Furthermore, the trapping device includes trapping material and is provided within the containment area.

[0010] Furthermore, the trapping material is made of woven fabric, stacked medium, or porous solid medium.

[0011] Furthermore, the filter assembly includes: a housing, wherein filter material is disposed within the housing; and multiple fixing bolts spaced apart along the extending direction of the housing, the fixing bolts being used to fix the filter material.

[0012] Furthermore, the housing is provided with second flanges at both ends, and the second flanges are connected to flange valves.

[0013] Furthermore, it also includes temperature measuring elements, which are disposed at both ends of the filter assembly and are used to monitor the inlet and outlet temperatures of the filter assembly.

[0014] Furthermore, the heating mechanism includes: a heating element disposed inside the storage heating tank; and a heating coil connected to the heating element and connected to a three-phase high-frequency current converter, wherein the heating coil is used to heat the heating element.

[0015] The present invention also provides a purification method for the polonium purification system for liquid lead-bismuth alloy coolant, comprising:

[0016] In the heating step, the lead-bismuth alloy coolant is electrically heated, wherein the lead-bismuth alloy coolant contains... 210 Po and 210 Po compounds are more easily precipitated;

[0017] The cooling step involves cooling the gaseous mixture precipitated from the lead-bismuth alloy coolant, removing some of the lead vapor and... 210 The temperature of Po decreases before reaching the steam-water separator, which better separates the lead vapor, which has partially become liquid in the gaseous mixture, from the lead vapor. 210 Po, the collection device connected together with the steam-water separator can be partially fixed. 210 Po;

[0018] The filtration and collection step filters the gaseous state. 210 Po and 210 Po compound, the impurity is retained in the collection device;

[0019] The filtered gas cooling step brings the temperature of the filtered gas back to the temperature before heating and provides a certain natural circulation driving force.

[0020] The gas return step allows the filtered gas to be returned to the lead-bismuth alloy coolant.

[0021] The technical solution of this invention has the following advantages:

[0022] 1. The present invention provides a coolant for liquid lead-bismuth alloys. 210 The purification system for Po includes: a storage and heating tank containing liquid lead-bismuth alloy, with an inlet pipe and an outlet pipe at the top; a heating mechanism located within the storage and heating tank, used to raise the temperature of the liquid lead-bismuth alloy to facilitate the precipitation of gaseous products; a vapor-liquid separator located above the storage and heating tank, used to separate gaseous products; a filter assembly connected to the vapor-liquid separator, used to capture polonium and polonium compounds in the gaseous products; a cooling mechanism including a first cooling section and a second cooling section, the first cooling section being located between the storage and heating tank and the vapor-liquid separator, and the second cooling section being located between the filter assembly and the outlet pipe; and a reflux pipe connected to the second cooling section and the outlet pipe, with a gas diffusion nozzle on the reflux pipe.

[0023] By storing liquid lead-bismuth alloy in a storage and heating tank, a space is provided for it. The tank is equipped with inlet and outlet pipes to facilitate the entry and exit of the liquid lead-bismuth alloy. The storage and heating tank contains a heating mechanism that significantly increases the temperature, enhancing the efficiency of the overflow of gases and Pb, Po vapors, and gaseous Po compounds from the liquid lead-bismuth alloy. After the gaseous products overflow, a first cooling section creates a low-temperature environment to guide them into a vapor-liquid separator. The separator separates lead and Po from the gaseous products. Once the lead and Po flow to the bottom of the separator, they are captured and fixed, reducing clogging of downstream filter components and extending their service life. Finally, a second cooling section significantly lowers the temperature, providing the driving force for the gas overflowing from the storage and heating tank to pass through the filter components. As the gaseous products continue to flow through the filter components, most of the impurities are removed. 210 Po is captured and fixed by the filter assembly. The remaining gaseous products mainly consist of H2, H2O, and inert gases (Ar, N2, etc.). Since the purified gas is still required for oxygen control of the liquid lead-bismuth alloy, it is returned to the liquid lead-bismuth alloy through the reflux pipe, the gas diffusion nozzle on the reflux pipe, and the discharge pipe, thus completing the process. 210 Po capture and purification.

[0024] This is for use in lead-bismuth cooled reactors employing gaseous oxygen control technology and in lead-bismuth experimental loops. 210 The Po purification device has a simple structure, is easy to replace, has online purification capabilities, and the collection device can be isolated, disassembled, and replaced, which helps to fix the lead-bismuth alloy. 210 Po and its compounds improve the operational safety of lead-bismuth cooled reactors and lead-bismuth experimental circuits, and reduce the post-operation maintenance requirements of lead-bismuth cooled reactors and lead-bismuth circuits. 210 Po spread risk.

[0025] 2. The present invention provides a coolant for liquid lead-bismuth alloys. 210 The Po purification system includes a trapping device comprising trapping material within a containment area. The trapping device is located below the vapor-liquid separation trapping device. The containment area is filled with trapping material to immobilize Pb and Po and their compounds. The outer surface of the trapping device, i.e., the outer wall of the cylinder corresponding to the containment area, can be covered with a certain thickness of metallic lead to reduce the impact of radiation on the surrounding environment.

[0026] The summary section is provided to present the chosen concepts in a simplified form, which will be further described in the detailed description below. The summary section is not intended to identify essential or necessary features of this disclosure, nor is it intended to limit the scope of this disclosure. Attached Figure Description

[0027] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0028] Figure 1 The present invention provides a coolant for liquid lead-bismuth alloys. 210 A schematic diagram of the Po purification system;

[0029] Figure 2 The present invention provides a coolant for liquid lead-bismuth alloys. 210 A schematic diagram of the filter components of the Po purification system;

[0030] Figure 3 The present invention provides a coolant for liquid lead-bismuth alloys. 210 A schematic diagram of the vapor-water separator in Po's purification system;

[0031] Figure 4 The present invention provides a coolant for liquid lead-bismuth alloys. 210 A schematic diagram of the heating mechanism of the Po purification system.

[0032] Explanation of reference numerals in the attached figures:

[0033] 1. Storage and heating tank; 2. Feed pipe; 3. Discharge pipe; 4. Heating mechanism; 5. Gas-water separator; 6. Filter assembly; 7. First cooling section; 8. Second cooling section; 9. Return pipe; 10. Gas diffusion nozzle; 11. Gas-water separation device; 12. Collection device; 13. Cylinder; 14. Receiving area; 15. Gas-water separation baffle; 16. Collection material; 17. Shell; 18. Filter material; 19. Fixing bolt; 20. First flange; 21. First flange fixing hole; 22. Heating element; 23. Heating coil; 24. Three-phase high-frequency current converter; 25. One-way valve; 26. Protective atmosphere feed pipe; 27. Stainless steel partition; 28. Second flange; 29. ​​Second flange fixing hole; 30. Flanged valve. Detailed Implementation

[0034] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of this disclosure. Therefore, the drawings and description are to be considered exemplary in nature and not restrictive.

[0035] In the description of this disclosure, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing this disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this disclosure. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this disclosure, "a plurality of" means two or more, unless otherwise explicitly specified.

[0036] In the description of this disclosure, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joint" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections, electrical connections, or connections that allow for communication; they can refer to direct connections or indirect connections through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this disclosure according to the specific circumstances.

[0037] In this disclosure, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0038] The following disclosure provides numerous different embodiments or examples for implementing various structures of this disclosure. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of this disclosure. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, various specific examples of processes and materials are provided in this disclosure, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0039] The preferred embodiments of this disclosure are described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit this disclosure.

[0040] Please see Figures 1 to 4 As shown, the present invention provides a coolant for liquid lead-bismuth alloys. 210 The purification system for PO includes: a storage and heating tank 1 containing liquid lead-bismuth alloy, with an inlet pipe 2 and an outlet pipe 3 at its top; a heating mechanism 4 located within the storage and heating tank 1, used to raise the temperature of the liquid lead-bismuth alloy to facilitate the precipitation of gaseous products; a vapor-liquid separator 5 located above the storage and heating tank 1, used to separate gaseous products; and a filter assembly 6 connected to the vapor-liquid separator 5, used to capture gaseous products. 210 PO and 210 PO compound; cooling mechanism, the cooling mechanism including a first cooling section 7 and a second cooling section 8, the first cooling section 7 being located between the storage heating tank 1 and the gas-water separator 5, the second cooling section 8 being located between the filter assembly 6 and the discharge pipe 3; reflux pipe 9, connected to the second cooling section 8 and the discharge pipe 3, the reflux pipe 9 being provided with a gas diffusion nozzle 10.

[0041] By storing liquid lead-bismuth alloy in the storage and heating tank 1, a space is provided for the liquid lead-bismuth alloy. The storage and heating tank 1 is equipped with an inlet pipe 2 and an outlet pipe 3, facilitating the entry of the liquid lead-bismuth alloy into the storage and heating tank 1 and the discharge of the purified liquid lead-bismuth alloy. The storage and heating tank 1 is equipped with a heating mechanism 4, which can significantly increase the temperature, thereby increasing the efficiency of the overflow of gaseous products such as Pb, Po vapor, and gaseous Po compounds from the liquid lead-bismuth alloy. After the gaseous products overflow, the first cooling section 7 creates a low-temperature environment to guide them into the steam-water separator 5. The steam-water separator 5 separates lead and Po from the gaseous products. After the lead and Po flow into the bottom of the steam-water separator 5, they are captured and fixed, reducing the clogging of the downstream filter assembly 6 by lead and other products, and improving the service life of the filter assembly 6. Finally, after passing through the second cooling section 8, the temperature is significantly reduced, providing the driving force for the gas overflowing from the storage and heating tank 1 to pass through the filter assembly 6. As the gaseous products continue to flow through the filter assembly 6, most of them are... 210 Po is captured and fixed by the filter assembly 6. The remaining gaseous products mainly consist of H2, H2O, and inert gases (Ar, N2, etc.). Since the purified gas is still required for oxygen control of the liquid lead-bismuth alloy, it is returned to the liquid lead-bismuth alloy through the return pipe 9, the gas diffusion nozzle 10 installed on the return pipe 9, and the discharge pipe 3, thus completing the process. 210 Po capture and purification.

[0042] This is for use in lead-bismuth cooled reactors employing gaseous oxygen control technology and in lead-bismuth experimental loops. 210 The Po purification device has a simple structure, is easy to replace, has online purification capabilities, and the collection device 12 can be isolated, disassembled, and replaced, which helps to fix the lead-bismuth alloy. 210 Po and its compounds improve the operational safety of lead-bismuth cooled reactors and lead-bismuth experimental circuits, and reduce the post-operation maintenance requirements of lead-bismuth cooled reactors and lead-bismuth circuits. 210 Po spread risk.

[0043] The feed pipe 2 is equipped with a one-way valve 25 to prevent the liquid lead-bismuth alloy entering the storage and heating tank 1 from flowing back. The feed pipe 2 is positioned above the liquid surface, or flush with it.

[0044] Meanwhile, a one-way valve 25 is also installed on the return pipe 9.

[0045] The discharge pipe 3 is located at the bottom of the housing 17 and is connected to the return pipe 9. The discharge pipe 3 allows the purified liquid lead-bismuth alloy to maintain the operating pressure in the pipeline by gravity. A valve can be installed on the discharge pipe 3, allowing the purification system to be switched between online and offline purification.

[0046] During gas recirculation, the gas diffuser nozzle 10 is connected to the discharge pipe 3, so that the oxygen content in the purified lead-bismuth alloy can be replenished in time, thus avoiding corrosion of the discharge pipe 3.

[0047] Among them, the first cooling section 7 and the second cooling section 8 are cooling pipes.

[0048] In some optional embodiments, the steam-water separator 5 includes a steam-water separation device 11 and a collection device 12, the collection device 12 being located below the steam-water separation device 11 and connected to the first cooling section 7, and the steam-water separation device 11 being connected to the filter assembly 6.

[0049] Specifically, the vapor-water separation device 11 includes a cylinder 13 and vapor-water separation baffles 15; wherein, the bottom of the cylinder 13 is provided with a receiving area 14; there are two vapor-water separation baffles 15, and the two vapor-water separation baffles 15 are arranged alternately.

[0050] The gas-water separator 11 is a plate type, and the material can be corrosion-resistant 316L stainless steel. It can also be equipped with surface treatment processes such as electroplating to improve its service life.

[0051] The trapping device 12 includes trapping material 16 and is located within the containment area 14. The trapping device 12 is situated below the vapor-liquid separation trapping device 12. The containment area 14 is filled with trapping material 16 to fix Pb and Po and their compounds. The outer surface of the trapping device 12, i.e., the outer wall of the cylinder 13 corresponding to the containment area 14, can be covered with a certain thickness of metallic lead to reduce the impact of radiation on the surrounding environment.

[0052] The trapping material 16 is made of fabric, stacked medium, or porous solid medium.

[0053] Fabric media are meshes woven from glass fibers, metal wires, or fibers. These media can trap particles with a minimum diameter of 5 to 6 μm.

[0054] The packing medium is composed of different types of solid particles and can be used for deep filtration.

[0055] Porous solid media refers to solid materials with many micropores, which can be used to filter fine particles with a diameter of 1 to 3 μm.

[0056] This is used as a coolant for liquid lead-bismuth alloys. 210 The PO purification system uses a bed of metallic Ti particles in conjunction with a metal wire mesh for collection. The metal particles and the metal wire mesh are arranged alternately to form the collection material 16.

[0057] The cylinder 13 is provided with first flanges 20 at both ends, and first flange fixing holes 21 are provided on the first flanges 20. The filter assembly 6 is installed on the pipeline through the first flanges 20 and bolts, and the steam-water separator 5 and the second cooling section 8 are connected.

[0058] In some optional embodiments, the filter assembly 6 includes a housing 17, a filter material 18, and fixing bolts 19; wherein the filter material 18 is disposed inside the housing 17; and multiple fixing bolts 19 are provided at intervals along the extending direction of the housing 17, and the fixing bolts 19 are used to fix the filter material 18.

[0059] The housing 17 and the fixing bolt 19 can be made of 316L stainless steel. This material has strong corrosion resistance and can effectively fix the filter material 18, ensuring that the system will not be blocked due to damage to the filter material 18.

[0060] Filter material 18 can be multi-layer silica glass cloth, basalt fabric, metal fiber pinhole cloth, alumina (Al2O3) ball bed, Ti particles, etc. Studies have shown that the reference dimensions for silica glass cloth are a thickness of 4-5 mm and a fiber diameter of 6 micrometers, while the reference dimensions for metal fiber materials are a thickness of 2-6 mm and a fiber diameter of 40 micrometers, which can effectively fix [the filter material]. 210 Po and its compounds.

[0061] In an embodiment of the present invention, the housing 17 of the filter assembly 6 is made of woven metal mesh for filtration and trapping. The mesh filling density can be selected according to the friction loss level during system operation to ensure normal operation of the loop.

[0062] In other alternative embodiments, the inner surface of the filter assembly 6 may be coated with a corrosion-resistant ceramic material, or electroplated with a gold, nickel, or zinc layer to prevent corrosion. Furthermore, surface treatment methods such as epoxy resin spraying, phosphating, electrophoresis, and vacuum vapor deposition are also available, but since these methods are well-known to those skilled in the art, they will not be described in detail here.

[0063] It should be noted that when the system is shut down or the experimental loop is stopped for maintenance, filter assembly 6 can be completely disassembled and replaced to improve system operation and collection efficiency. All of the above are verified to be effective in collecting and fixing samples. 210 The material of Po. A certain thickness of lead can be used to coat the surface of filter component 6 to reduce the impact of radiation on the surrounding environment.

[0064] The housing 17 has second flanges 28 at both ends, which are connected to flange valves 30. The filter assembly 6 is connected to the flange valve 30 via flange connection. Furthermore, the second flange 28 has a second flange fixing hole 29, thereby enabling the connection between the second flange 28 and the flange valve 30. Similarly, it is connected to the pipeline via flange connection to achieve the effect of replaceable filter assembly 6.

[0065] The filter assembly 6 also includes temperature sensing elements (not shown in the figure), which are disposed at both ends of the filter assembly 6 and are used to monitor the inlet and outlet temperatures of the filter assembly 6. The temperature sensing elements may be thermocouples. In other embodiments, the temperature sensing elements may be resistance temperature detectors (RTDs) or thermistors.

[0066] In some optional embodiments, the heating mechanism 4 includes a heating element 22 and a heating coil 23, as well as a three-phase high-frequency current converter 24; wherein the heating element 22 is disposed inside the storage heating tank 1; the heating coil 23 is sleeved and connected to the heating element 22, and the heating coil 23 is connected to the three-phase high-frequency current converter 24 and the controller, and the heating coil 23 is used to heat the heating element 22.

[0067] The heating element 22 is an eddy current heater, which allows the liquid lead-bismuth alloy entering the storage heating tank 1 to rise in temperature extremely rapidly.

[0068] In this embodiment, eddy current heating is achieved by an external 380V three-phase power supply, which is input to the heating coil 23 via a three-phase high-frequency current converter 24. Since the lead-bismuth alloy has low magnetic permeability, a heating element 22, treated as described above, is installed inside the storage heating tank 1. This heating element 22 is made of stainless steel partition 27, and the lead-bismuth alloy is heated within the compartment. The advantage of this heating method is that it eliminates the need for openings in the storage heating tank 1, simplifying the manufacturing process.

[0069] The storage and heating tank 1 is not completely filled with liquid lead-bismuth alloy; the upper 1 / 5 is a gas phase space, and it is not higher than the location of the feed pipe 2. Before the system is put into operation, argon gas is introduced into the storage and heating tank 1 through the protective atmosphere feed pipe 262 as a protective atmosphere to maintain the high pressure in this part compared with the downstream filtration section, thereby improving the overflow efficiency of volatile Po and its compounds.

[0070] Unlike typical argon purging systems, this system is only used for pressure replenishment during the initial operation of the purification system, significantly reducing argon consumption and production costs. Thermocouples are arranged at the top of the storage and heating tank 1 to measure the temperature of the protective atmosphere.

[0071] The present invention also provides a method for using the aforementioned coolant for liquid lead-bismuth alloys. 210Purification methods for PO purification systems include:

[0072] In the heating step, the lead-bismuth alloy coolant is electrically heated, wherein the lead-bismuth alloy coolant contains... 210 Po and 210 Po compounds are more easily precipitated;

[0073] The cooling step involves cooling the gaseous mixture precipitated from the lead-bismuth alloy coolant, removing some of the lead vapor and... 210 The temperature of Po decreases before reaching the steam-water separator 5, which better separates the lead vapor, which has partially become liquid in the gaseous mixture, from the lead vapor. 210 Po, the collection device 12 connected to the gas-water separator 5 can be partially fixed. 210 Po;

[0074] The filtration and collection step filters the gaseous state. 210 Po and 210 Po compounds and impurities are retained in the collection device 12;

[0075] The filtered gas cooling step brings the temperature of the filtered gas back to the temperature before heating and provides a certain natural circulation driving force.

[0076] The gas return step allows the filtered gas to be returned to the lead-bismuth alloy coolant.

[0077] In some optional embodiments, the first cooling section 7 and the second cooling section 8 within the cooling mechanism can be activated before the heating step begins. After the cooling mechanism is activated, liquid lead-bismuth alloy can be introduced into it.

[0078] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A coolant for liquid lead-bismuth alloys 210 Po's purification system is characterized by, include: Storage heating tank (1), the storage heating tank (1) contains liquid lead-bismuth alloy, and the storage heating tank (1) is provided with inlet pipe (2) and outlet pipe (3); Heating mechanism (4) is located inside the storage heating tank (1). Heating mechanism (4) is used to raise the temperature of liquid lead-bismuth alloy to facilitate the precipitation of gaseous products. A gas-water separator (5) is located above the storage heating tank (1). The gas-water separator (5) is used to separate gaseous products. a filter assembly (6) connected to the steam-water separator (5), the filter assembly (6) being configured to trap 210 Po and 210 Po compounds; The cooling mechanism includes a first cooling section (7) and a second cooling section (8). The first cooling section (7) is located between the storage heating tank (1) and the steam-water separator (5), and the second cooling section (8) is located between the filter assembly (6) and the discharge pipe (3). The return pipe (9) is connected to the second cooling section (8) and the discharge pipe (3), and a gas diffusion nozzle (10) is provided on the return pipe (9).

2. The coolant for liquid lead-bismuth alloys according to claim 1 210 Po's purification system is characterized by, The steam-water separator (5) includes a steam-water separation device (11) and a collection device (12). The collection device (12) is located below the steam-water separation device (11) and is connected to the first cooling section (7). The steam-water separation device (11) is connected to the filter assembly (6).

3. The coolant for liquid lead-bismuth alloys according to claim 2. 210 Po's purification system is characterized by, The steam-water separator (11) includes: The cylinder (13) has a receiving area (14) at its bottom; There are two steam-water separation baffles (15), and the two steam-water separation baffles (15) are staggered.

4. The coolant for liquid lead-bismuth alloys according to claim 3. 210 Po's purification system is characterized by, The trapping device (12) includes trapping material (16) and has a containment area (14).

5. The coolant for liquid lead-bismuth alloys according to claim 4. 210 Po's purification system is characterized by, The trapping material (16) is made of fabric medium, stacked medium, or porous solid medium.

6. The coolant for liquid lead-bismuth alloys according to any one of claims 1-5 210 Po's purification system is characterized by, The filter component (6) includes: The housing (17) contains filter material (18); Multiple fixing bolts (19) are provided at intervals along the extension direction of the housing (17) and are used to fix the filter material (18).

7. The coolant for liquid lead-bismuth alloys according to claim 6. 210 Po's purification system is characterized by, The housing (17) has second flanges (28) at both ends, and the second flanges (28) are connected to the flange valve (30).

8. The coolant for liquid lead-bismuth alloys according to claim 6 210 Po's purification system is characterized by, It also includes temperature measuring elements, which are located at both ends of the filter assembly (6) and are used to monitor the inlet and outlet temperatures of the filter assembly (6).

9. The coolant for liquid lead-bismuth alloys according to claim 8. 210 Po's purification system is characterized by, The heating mechanism (4) includes: Heating element (22) is located inside the storage heating tank (1); Heating coil (23) is connected to heating element (22) and is connected to three-phase high-frequency current converter (24). Heating coil (23) is used to heat heating element (22).

10. A coolant for liquid lead-bismuth alloys using any one of claims 1-9 210 The purification method of the Po purification system is characterized by... include: The heating step is electric heating of the lead bismuth alloy coolant, and the lead bismuth alloy coolant is 210 Po and 210 Po compounds are more likely to precipitate; cooling step, cooling down the gaseous mixture that separates from the lead bismuth eutectic coolant, part of the lead vapour and 210 Po, the temperature of which is reduced before reaching the steam-water separator (5) that better separates the lead vapour that has become liquid in the gaseous mixture and 210 Po, the steam-water separator (5) being connected to a trapping device (12) that is able to partially fix 210 Po; Filtration and collection steps, filtering gaseous substances 210 Po and 210 Po compounds and impurities are retained in the collection device (12); The filtered gas cooling step brings the temperature of the filtered gas back to the temperature before heating and provides a certain natural circulation driving force. The gas return step allows the filtered gas to return to the lead-bismuth alloy coolant.

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