Device for improving oxygen concentration in lead bismuth alloy

Abstract

The embodiment of the invention provides a device for improving the oxygen concentration in lead-bismuth alloy, and the device comprises a housing which is arranged to form a containing cavity, and the bottom and the top of the housing are respectively provided with a fluid inlet and a fluid outlet which are communicated with the containing cavity; the containing cavity is filled with the oxide particles, when the lead-bismuth alloy flows through the oxide particles, the oxide particles can be dissolved to generate oxygen, and therefore the oxygen concentration in the lead-bismuth alloy is increased; the isolation cover is arranged in the containing cavity and used for forming an independent space in the containing cavity, and the portion, outside the isolation cover, of the containing cavity is filled with the oxide particles; and the fluid driving part extends into the isolation hood from the outside of the shell and is used for providing power for the lead-bismuth alloy to enter the accommodating cavity from the fluid inlet and flow out from the fluid outlet. The isolation cover is arranged, the fluid driving piece extends into the isolation cover from the outside, the lead-bismuth alloy can be driven to make contact with the oxide particles, the flow speed can be adjusted, and the oxygen concentration in the lead-bismuth alloy can be effectively improved.

Description

Technical Field

[0001] The present application relates to the technical field of processing coolant in a nuclear reactor, and in particular to a device for increasing the oxygen concentration in a lead-bismuth alloy. Background Art

[0002] This section of content merely provides background information related to the present application and does not necessarily constitute prior art.

[0003] Lead-bismuth alloy is used as a coolant in nuclear reactors, and the oxygen concentration has a great influence on the corrosion of lead-bismuth alloy to nuclear reactor structural materials. Adjusting the oxygen concentration within a reasonable range can mitigate the corrosion of lead-bismuth alloy to structural materials. When the oxygen content in the liquid lead-bismuth alloy is lower than the requirement, the oxygen concentration can be increased by solid-phase oxygen control technology. However, in the related art, the device for increasing the oxygen concentration in lead-bismuth alloy based on solid-phase oxygen control technology has the problem of being difficult to effectively increase the oxygen concentration in lead-bismuth alloy in some cases. Summary of the invention

[0004] A brief overview of the present application is provided below in order to provide a basic understanding of certain aspects of the present application. It should be understood that this overview is not an exhaustive overview of the present application. It is not intended to identify the key or important parts of the present application, nor is it intended to limit the scope of the present application. Its purpose is merely to present certain concepts in a simplified form as a prelude to a more detailed description discussed later.

[0005] The present application provides a device for increasing the oxygen concentration in a lead-bismuth alloy, comprising: a shell, the shell being arranged to form a containing cavity, the bottom and top of the shell being respectively provided with a fluid inlet and a fluid outlet connected to the containing cavity; oxide particles, filled in the containing cavity, when the lead-bismuth alloy flows through the oxide particles, the oxide particles can dissolve to produce oxygen, thereby increasing the oxygen concentration in the lead-bismuth alloy; an isolation cover, arranged in the containing cavity, used to form an independent space in the containing cavity, the oxide particles are filled in the containing cavity outside the isolation cover; a fluid driving member, the fluid driving member extending from the outside of the shell into the isolation cover, used to provide power for the lead-bismuth alloy to enter the containing cavity from the fluid inlet and flow out from the fluid outlet.

[0006] In the embodiment of the present application, an isolation cover is provided to form an independent space in the accommodation chamber, and a fluid driving member is extended from the outside of the housing into the isolation cover, so that the lead-bismuth alloy can be driven by the fluid driving member to enter the accommodation chamber to contact with the oxide particles to form oxygen. Since the fluid driving member can adjust the flow rate of the lead-bismuth alloy in the accommodation chamber, it is beneficial to effectively increase the oxygen concentration in the lead-bismuth alloy.

[0007] These and other advantages of the present application will become more apparent through the following detailed description of the preferred embodiments of the present application in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] In order to further illustrate the above and other advantages and features of the present application, the specific embodiments of the present application are further described in detail below in conjunction with the accompanying drawings. The accompanying drawings together with the following detailed description are included in this specification and form a part of this specification. Elements with the same function and structure are represented by the same reference numerals. It should be understood that these drawings only describe typical examples of the present application and should not be regarded as limiting the scope of the present application.

[0009] Figure 1 is a schematic structural diagram of a device for increasing the oxygen concentration in a lead-bismuth alloy according to an embodiment of the present application, wherein arrows in the figure indicate the flow direction of the lead-bismuth alloy;

[0010] Figure 2 yes Figure 1 Schematic cross-section of the device shown.

[0011] It should be noted that the drawings are not necessarily drawn to scale, but are merely shown in a schematic manner that does not affect the reader's understanding.

[0012] Description of reference numerals:

[0013] 10. Shell; 11. Accommodating chamber; 12. Top cover; 13. Bottom plate; 14. Cylinder; 15. Insulating member; 16. Fluid inlet; 161. First straight line segment; 162. Arc line segment; 17. Fluid outlet; 171. Second straight line segment; 172. Third straight line segment;

[0014] 20. Oxide particles; 21. Isolation net;

[0015] 31. fluid driving part; 311. impeller; 312. rotating shaft; 32. isolation cover;

[0016] 41. Heating element; 42. Temperature measuring element. DETAILED DESCRIPTION

[0017] Exemplary embodiments of the present application will be described below in conjunction with the accompanying drawings. For the sake of clarity and conciseness, not all features of the actual implementation are described in the specification. However, it should be understood that many implementation-specific decisions must be made in the process of developing any such actual implementation in order to achieve the developer's specific goals, such as meeting those constraints related to the system and business, and these constraints may vary from implementation to implementation. In addition, it should be understood that although the development work may be very complex and time-consuming, it is only a routine task for those skilled in the art who benefit from the content of this application.

[0018] It is also necessary to explain here that, in order to avoid obscuring the present application due to unnecessary details, only the device structure and / or processing steps closely related to the scheme according to the present application are shown in the accompanying drawings, while other details that are not very relevant to the present application are omitted.

[0019] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in this application should have the common meanings understood by persons with ordinary skills in the field to which this application belongs.

[0020] In the description of the embodiments of the present application, “plurality” means at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0021] In the related art, the device for increasing the oxygen concentration of the lead-bismuth alloy based on the solid-state oxygen control technology usually uses the lead-bismuth coolant loop in the lead-bismuth reactor to realize the inflow and outflow of the coolant. The inventor of the present application found that due to the small size of the oxide particles filled in the device, in some cases, due to the accumulation of oxide particles, there is a situation that affects the flow of the coolant, making it difficult to effectively increase the oxygen content in the lead-bismuth coolant.

[0022] In order to solve the above technical problems, an embodiment of the present application provides a device for increasing the oxygen concentration in a lead-bismuth alloy (hereinafter referred to as an oxygen concentration increasing device).

[0023] See also Figure 1 and Figure 2 , Figure 1 A schematic diagram showing the structure of the oxygen concentration increasing device is shown. Figure 1 The middle arrows show the flow direction of the lead-bismuth alloy; Figure 2 Show Figure 1 The schematic cross-sectional view of the device shown in the figure shows that the oxygen concentration increasing device of the embodiment of the present application may include: a housing 10, oxide particles 20, an isolation cover 32 and a fluid driving member 31. The housing 10 is configured to form a receiving chamber 11, and the bottom and top of the housing 10 are respectively provided with a fluid inlet 16 and a fluid outlet 17 connected to the receiving chamber 11. The oxide particles 20 are filled in the receiving chamber 11. When the lead-bismuth alloy flows through the oxide particles 20, the oxide particles 20 can dissolve and produce oxygen, thereby increasing the oxygen concentration in the lead-bismuth alloy. The isolation cover 32 is disposed in the receiving chamber 11, and is used to form an independent space in the receiving chamber 11. The oxide particles 20 are filled in the receiving chamber 11 outside the isolation cover 32. The fluid driving member 31 extends from the outside of the housing 10 into the isolation cover 32, and is used to provide power for the lead-bismuth alloy to enter the receiving chamber 11 from the fluid inlet 16 and flow out from the fluid outlet 17.

[0024] In the embodiment of the present application, an isolation cover 32 is provided to form an independent space in the accommodation chamber 11, and a fluid driving member 31 is extended from the outside of the housing 10 into the isolation cover 32, so that the lead-bismuth alloy can be driven by the fluid driving member 31 to enter the accommodation chamber 11 and contact the oxide particles 20 to form oxygen. Since the fluid driving member 31 can adjust the flow rate of the lead-bismuth alloy in the accommodation chamber 11, it is beneficial to effectively increase the oxygen concentration in the lead-bismuth alloy.

[0025] Since the fluid driving member 31 is used to drive the lead-bismuth alloy into the containing chamber 11, even if there is accumulation of oxide particles, it will not affect the flow of the lead-bismuth alloy; and since the lead-bismuth alloy flows from bottom to top through the oxide particles inside the containing chamber 11, it is helpful to avoid the accumulation of oxide particles.

[0026] In some embodiments, the isolation cover 32 may be made of a metal mesh whose mesh size is smaller than that of the oxide particles 20 , thereby preventing the oxide particles 20 from entering the isolation cover 32 through the mesh size of the metal mesh, thereby facilitating the normal operation of the fluid drive component 31 .

[0027] The oxide particles 20 may be, for example, lead oxide ceramic pellets.

[0028] In some embodiments, the fluid driving member 31 may be a pump.

[0029] In some embodiments, the oxygen concentration increasing device further comprises an isolation net 21, which is arranged in the accommodating chamber 11, the radial outer periphery of the isolation net 21 is connected to the peripheral wall of the accommodating chamber 11, and the radial inner periphery of the isolation net 21 is connected to the isolation cover 32. The fluid outlet 17 is arranged above the isolation net 21 and is located radially outside the isolation cover 32. The oxide particles 20 are filled in the accommodating chamber 11 below the isolation net 21, and the isolation net 21 is used to prevent the oxide particles 20 from leaving the accommodating chamber 11 through the fluid outlet 17. By arranging the isolation net 21 in the accommodating chamber 11, the movement range of the oxide particles 20 can be limited, and the oxide particles 20 can be prevented from moving arbitrarily with the flow of the lead-bismuth coolant, while allowing the lead-bismuth coolant to flow therethrough. The isolation net 21 is arranged below the fluid outlet 17, which can prevent the oxide particles 20 from leaving the fluid outlet 17 with the lead-bismuth alloy under the driving action, thereby improving the utilization rate of the oxide particles 20.

[0030] The material of the isolation net 21 can be, for example, a metal net.

[0031] In some embodiments, the isolation cover 32 extends to the bottom of the isolation net 21. This means that the thickness of the oxide particles 20 filled in the space below the isolation cover 32 is less than the thickness of the oxide particles 20 in the space around the isolation cover 32. The fluid driving member 31 includes an impeller 311, and the height of the impeller 311 in the accommodating chamber 11 is lower than the height of the surface filled with the oxide particles 20. Such a configuration is more conducive to driving the lead-bismuth alloy to flow.

[0032] In some embodiments, the fluid driving member 31 further includes a rotating shaft 312, which extends from the outside of the housing 10 into the isolation cover 32 and is connected to the impeller 311 to drive the impeller 311 to rotate. The rotating shaft 312 can adjust the rotation speed of the impeller 311, thereby adjusting the flow speed of the lead-bismuth alloy.

[0033] In some embodiments, the oxygen concentration increasing device further includes a heating element 41 for heating the oxide particles 20 and the lead-bismuth alloy entering the containing chamber 11. Since the dissolution rate of the oxide particles 20 is related to the fluid temperature of the lead-bismuth alloy, the rate of oxygen production by dissolving the oxide particles 20 can be adjusted by the heating element 41.

[0034] In some embodiments, the number of the heating elements 41 is two. The two heating elements 41 are inserted into the oxide particles 20 and are symmetrically disposed on both sides of the isolation cover 32 in the radial direction.

[0035] Symmetrically arranging the two heating elements 41 on both radial sides of the isolation cover 32 can make the oxide particles 20 and the lead-bismuth alloy in the accommodating cavity 11 be heated to a uniform temperature, thereby better regulating the rate of oxygen production by dissolving the oxide particles 20 .

[0036] In some embodiments, the heating element 41 may be a rod, and the heating element 41 extends downward from top to bottom to a position close to the fluid inlet 16. Two heating elements 41 may be disposed in the middle region of the accommodating chamber 11. Specifically, the two heating elements 41 are located on the same diameter of the accommodating chamber 11, and the diameter is divided into three equal parts.

[0037] In some embodiments, the oxygen concentration increasing device further includes a temperature measuring member 42 for measuring the temperature of the oxide particles 20 and the lead-bismuth alloy entering the containing chamber 11. The heating member 41 adjusts the heating power according to the temperature measured by the temperature measuring member 42. By providing the temperature measuring member 42, the temperature of the oxide particles 20 and the lead-bismuth alloy can be monitored in real time, so that the heating member 41 can adjust the heating power in real time according to the measured temperature, and better adjust the rate of oxygen production by dissolving the oxide particles 20.

[0038] The temperature measuring element 42 may be, for example, a thermocouple.

[0039] In some embodiments, there are two temperature measuring elements 42, and each temperature measuring element 42 is arranged near a corresponding heating element 41 to ensure the accuracy of the measured temperature, so that the two heating elements 41 can respectively adjust the heating power in real time according to the measured temperature to ensure that the temperature of the oxide particles 20 and the lead-bismuth alloy in the containing cavity 11 is uniform, so that the rate of oxygen production by dissolving the oxide particles 20 can be better adjusted.

[0040] In some embodiments, the housing 10 includes a bottom plate 13 and a barrel 14 connected to the bottom plate 13. A fluid inlet 16 and a fluid outlet 17 are both formed on the barrel 14. A plurality of fluid inlets 16 are formed at the bottom of the barrel 14 along the circumferential direction of the barrel 14, and a plurality of fluid outlets 17 are formed at the top of the barrel 14 along the circumferential direction of the barrel 14.

[0041] In some embodiments, the housing 10 includes a top cover 12, which is connected to a cylinder 14. The bottom plate 13 and the top cover 12 can be connected to the cylinder 14 at the bottom and top ends of the cylinder 14, respectively, and the lead-bismuth alloy only flows in from the fluid inlet 16 and flows out from the fluid outlet 17.

[0042] In some embodiments, the periphery of the fluid inlet 16 includes two first straight line segments 161 extending in the horizontal direction and two arcuate line segments 162 respectively connecting the two first straight line segments 161 at both ends, and the length of the first straight line segment 161 is greater than the length of the arcuate line segment 162. The periphery of the fluid outlet 17 includes two second straight line segments 171 extending in the horizontal direction and two third straight line segments 172 respectively connecting the two second straight line segments 171 at both ends, and the length of the second straight line segment 171 is less than the length of the third straight line segment 172. Such a configuration is conducive to reducing the flow resistance of the lead-bismuth alloy.

[0043] In some embodiments, the oxygen concentration increasing device further includes a heat-insulating member 15, which is disposed on the inner wall of the housing 10 and is used to insulate the accommodation chamber 11 from the outside. By disposing the heat-insulating member 15 on the inner wall of the housing 10, heat transfer between the lead-bismuth alloy in the accommodation chamber 11 and the lead-bismuth alloy outside the housing 10 can be prevented, thereby reducing the radial temperature gradient inside the accommodation chamber 11 and ensuring that the temperature of the lead-bismuth alloy in the accommodation chamber 11 is uniform.

[0044] In some embodiments, the heat preservation member 15 is disposed on the inner wall of the cylinder 14, and the height of the heat preservation member 15 is equal to the height of the surface filled with the oxide particles 20. This configuration can not only save the cost of using heat preservation materials, but also more effectively block heat transfer in the key area of ​​the accommodating cavity 11.

[0045] When the oxygen concentration increasing device is operating normally, due to the driving pressure of the fluid driving member 31, the lead-bismuth alloy enters the containing chamber 11 containing the oxide particles 20 from the fluid inlet 16 at the lower end of the oxygen concentration increasing device. Under the action of the fluid flushing, the oxide particles 20 dissolve and produce oxygen, so that the oxygen concentration of the lead-bismuth alloy flowing out of the oxygen concentration increasing device increases. Since the dissolution rate of the oxide particles 20 is related to the fluid temperature, the power of the heating member 41 can be adjusted to adjust the oxygen increase rate. The flow rate of the lead-bismuth alloy when passing through the oxide particles 20 will also affect its oxygen dissolution rate. By adjusting the power of the fluid driving member 31 to adjust the flow rate of the lead-bismuth alloy, the oxygen increase rate is adjusted, and the oxygen concentration of the liquid lead-bismuth alloy is within a reasonable range, so as to effectively inhibit the corrosion of the liquid lead-bismuth to the structural material.

[0046] Regarding the embodiments of the present application, it should also be noted that, in the absence of conflict, the embodiments of the present application and the features therein can be combined with each other to obtain new embodiments.

[0047] The above are only specific implementation methods of the present application, but the protection scope of the present application is not limited thereto. The protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A device for increasing the oxygen concentration in a lead-bismuth alloy, characterized in that: include: A shell, the shell is configured to form a receiving cavity, and the bottom and top of the shell are respectively provided with a fluid inlet and a fluid outlet communicated with the receiving cavity; Oxide particles are filled in the containing cavity, and when the lead-bismuth alloy flows through the oxide particles, the oxide particles can dissolve to generate oxygen, thereby increasing the oxygen concentration in the lead-bismuth alloy; An isolation cover is disposed in the accommodating cavity and is used to form an independent space in the accommodating cavity, and the oxide particles are filled in the accommodating cavity outside the isolation cover; A fluid driving member extends from the outside of the shell into the isolation cover, and is used to provide power for the lead-bismuth alloy to flow from the fluid inlet into the accommodating chamber and out of the fluid outlet.

2. The device according to claim 1, characterized in that The isolation cover is made of a metal mesh, and the mesh size of the metal mesh is smaller than the size of the oxide particles.

3. The device according to claim 1, characterized in that Also includes: An isolation net is arranged in the accommodating cavity, wherein the radial outer peripheral edge of the isolation net is connected to the peripheral wall of the accommodating cavity, and the radial inner peripheral edge of the isolation net is connected to the isolation cover; The fluid outlet is arranged above the isolation net and located radially outside the isolation cover; The oxide particles are filled in a containing cavity below the isolation net, and the isolation net is used to prevent the oxide particles from leaving the containing cavity through the fluid outlet.

4. The device according to claim 3, characterized in that The isolation cover extends to below the isolation net; The fluid driving member comprises an impeller, and the height of the impeller in the accommodating chamber is lower than the height of the oxide particle filling surface.

5. The device according to claim 1, characterized in that Also includes: A heating element is used to heat the oxide particles and the lead-bismuth alloy entering the containing cavity.

6. The device according to claim 5, characterized in that The number of the heating elements is two, and the two heating elements are inserted into the oxide particles and are symmetrically arranged on both sides of the isolation cover in radial direction.

7. The device according to claim 5, characterized in that Also includes: A temperature measuring member, used for measuring the temperature of the oxide particles; The heating element adjusts heating power according to the temperature measured by the temperature measuring element.

8. The device according to claim 1, characterized in that The housing comprises a bottom plate and a cylinder connected to the bottom plate; A plurality of fluid inlets are formed at the bottom of the cylinder along the circumferential direction of the cylinder, and a plurality of fluid outlets are formed at the top of the cylinder along the circumferential direction of the cylinder.

9. The device according to claim 8, characterized in that The periphery of the fluid inlet includes two first straight line segments extending in the horizontal direction and two arcuate line segments connecting the two first straight line segments at both ends, and the length of the first straight line segment is greater than the length of the arcuate line segment; The periphery of the fluid outlet includes two second straight line segments extending in the horizontal direction and two third straight line segments connecting the two second straight line segments at both side ends, and the length of the second straight line segment is smaller than the length of the third straight line segment.

10. The device according to claim 1, characterized in that Also includes: The heat-insulating component is arranged on the inner wall of the shell and is used for heat-insulating the accommodating cavity and the outside.

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