Heat exchanger

Abstract

The embodiment of the invention relates to the technical field of reactor waste heat removal, in particular to a heat exchanger. The heat exchanger is suitable for a lead-bismuth reactor and comprises an inlet air door box body assembly, a heat exchange assembly and an outlet air door box body assembly. The inlet air door box assembly is arranged to receive air from the outside. The heat exchange assembly is arranged to receive a coolant from the lead bismuth reactor, and the coolant transfers heat to air from the inlet air door box body through the heat exchange assembly and then flows out through the heat exchange assembly. The outlet air door box body assembly is arranged to receive air from the heat exchange assembly and enable the air to flow out of the outlet air door box body assembly. The inlet air door box body assembly, the heat exchange assembly and the outlet air door box body assembly are detachably connected. According to the heat exchanger provided by the embodiment of the invention, the inlet air door box body assembly, the heat exchange assembly and the outlet air door box body assembly are detachably connected, so that the heat exchanger is convenient to assemble and disassemble, and damaged parts in the heat exchanger are convenient to maintain or replace.

Description

Technical Field

[0001] The present application relates to the technical field of removing waste heat from a reactor, and in particular to a heat exchanger. Background Art

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

[0003] The lead-bismuth-air heat exchanger is an important component of the main heat transfer system of the lead-bismuth fast reactor. It is mainly used to discharge the heat generated by the reactor (as a heat source) from the secondary circuit system to the atmosphere. In accident conditions, when the reactor cannot remove the residual heat normally, the lead-bismuth-air heat exchanger can also use passive natural circulation to remove the residual heat from the core to ensure the safe and stable operation of the reactor. 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] To solve the above technical problems, an embodiment of the present application provides a heat exchanger, which is suitable for a lead-bismuth reactor. The heat exchanger may include an inlet damper housing assembly, a heat exchange assembly, and an outlet damper housing assembly. The inlet damper housing assembly is configured to receive air from the outside. The heat exchange assembly is configured to receive coolant from the lead-bismuth reactor, and the coolant transfers heat to the air from the inlet damper housing through the heat exchange assembly and then flows out through the heat exchange assembly. The outlet damper housing assembly is configured to receive air from the heat exchange assembly and allow the air to flow out therefrom. The inlet damper housing assembly, the heat exchange assembly, and the outlet damper housing assembly are detachably connected.

[0006] The heat exchanger of the embodiment of the present application is configured with a detachable connection between the inlet damper housing assembly, the heat exchange assembly and the outlet damper housing assembly to facilitate assembly and disassembly of the heat exchanger, thereby facilitating repair or replacement of damaged parts inside the heat exchanger.

[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 heat exchanger according to an embodiment of the present application;

[0010] Figure 2 is a schematic structural diagram of a heat exchanger according to an embodiment of the present application, showing the air flow direction;

[0011] Figure 3 It is a schematic structural diagram of a heat exchange component according to an embodiment of the present application.

[0012] 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.

[0013] Description of reference numerals:

[0014] 10. Inlet damper housing assembly; 11. First support housing; 12. Inlet damper;

[0015] 20. heat exchange assembly; 21. second support shell; 22. first collector; 23. second collector; 24. heat exchange tube; 25. support frame; 251. fixing member;

[0016] 30. Outlet damper housing assembly; 31. Third supporting shell; 32. Outlet damper. 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] The inventor of the present application has found that during the operation of the lead-bismuth-air heat exchanger, in some cases, the liquid lead-bismuth coolant may leak, thereby affecting the normal operation of the heat exchanger. Therefore, for the heat exchanger used for heat exchange between the liquid lead-bismuth coolant and the air, it is necessary to repair and replace the components inside the heat exchanger that cause the coolant to leak.

[0022] The lead-bismuth-air heat exchanger in the related art usually has its internal components connected by welding. Therefore, when the liquid lead-bismuth coolant leaks, it is difficult to repair or replace the components inside the heat exchanger that cause the coolant leakage.

[0023] In order to solve the above technical problems, an embodiment of the present application provides a heat exchanger, which is suitable for a lead-bismuth reactor.

[0024] See also Figure 1 , Figure 1 1 is a schematic diagram of the structure of a heat exchanger according to an embodiment. The heat exchanger of the embodiment of the present application may include an inlet damper housing assembly 10, a heat exchange assembly 20 and an outlet damper housing assembly 30. The inlet damper housing assembly 10 is configured to receive air from the outside. The heat exchange assembly 20 is configured to receive coolant from a lead-bismuth reactor. After the coolant transfers heat to the air from the inlet damper housing 12 through the heat exchange assembly 20, it flows out through the heat exchange assembly 20. The outlet damper housing assembly 30 is configured to receive air from the heat exchange assembly 20 and allow the air to flow out therefrom. The inlet damper housing assembly 10, the heat exchange assembly 20 and the outlet damper housing assembly 30 are detachably connected.

[0025] The heat exchanger of the embodiment of the present application is configured with a detachable connection between the inlet damper housing assembly 10, the heat exchange assembly 20 and the outlet damper housing assembly 30 to facilitate assembly and disassembly of the heat exchanger, thereby facilitating maintenance or replacement of components inside the heat exchanger.

[0026] In some embodiments, the inlet damper housing assembly 10 may include a plurality of inlet dampers 12 and a first support shell 11. The plurality of inlet dampers 12 are disposed on the first support shell 11, the plurality of inlet dampers 12 are configured to receive air from the outside, and the first support shell 11 is configured to be detachably connected to the heat exchange assembly 20. It is easy to understand that since the coolant flows in the heat exchange assembly 20, when the heat exchange assembly 20 is damaged, the coolant is likely to leak from the heat exchange assembly 20. In such an embodiment, since the first support shell 11 is detachably connected to the heat exchange assembly 20, when the heat exchange assembly 20 is damaged, the first support shell 11 can be easily removed, thereby facilitating the repair and replacement of the heat exchange assembly 20.

[0027] In some embodiments, a plurality of inlet dampers 12 may be disposed at intervals on the circumferential sidewall of the first support shell 11 to improve the uniformity of air entering the first support shell 11. In some embodiments, the number of inlet dampers 12 may be four, disposed on four sidewalls of the first support shell 11 respectively.

[0028] In some embodiments, the heat exchanger may further include an air volume adjustment member and a gas driving member. The air volume adjustment member and the gas driving member are arranged at the inlet damper 12, the gas driving member is used to drive the gas into the inlet damper 12, and the air volume adjustment member is used to adjust the air volume entering the inlet damper 12.

[0029] See also Figure 3 , Figure 3It is a structural schematic diagram of a heat exchange assembly 20 according to an embodiment of the present application. In some embodiments, the heat exchange assembly 20 may include a first collector 22, a second collector 23, a heat exchange tube 24, a support frame 25, and a second support shell 21. The heat exchange assembly 20 is configured such that the first collector 22 receives the coolant from the lead-bismuth reactor, and the coolant transfers the heat to the air from the inlet damper 12 box through the heat exchange tube 24, and then flows out through the second collector 23. The first collector 22 and the second collector 23 are fixedly connected to the heat exchange tube 24, respectively, and the support frame 25 is configured to support the first collector 22 and the second collector 23. Among them, the first collector 22, the second collector 23, the heat exchange tube 24, and the support frame 25 are arranged in the second support shell 21, and the second support shell 21 is arranged to be detachably connected to the first support shell 11. It is understandable that, since the coolant flows in the first collector 22, the second collector 23 and the heat exchange tube 24, when the first collector 22, the second collector 23 and the heat exchange tube 24 are damaged, the coolant is easy to leak out from the above components. In such an embodiment, since the second support shell 21 can be detachably connected to the first support shell 11, when the first collector 22, the second collector 23 and the heat exchange tube 24 in the second support shell 21 are damaged, the first support shell 11 can be disassembled to facilitate the maintenance or replacement of the above components.

[0030] In some embodiments, the support frame 25 may further include a fixing member 251. The fixing member 251 is used to fix the first current collector 22 and the second current collector 23 to the support frame 25. In some embodiments, the fixing member 251 may be a steel section.

[0031] In some embodiments, corresponding mating parts are respectively provided on the first supporting shell 11 and the second supporting shell 21. When the first supporting shell 11 is fixedly connected, the mating part of the first supporting shell 11 and the mating part of the second supporting shell 21 are first aligned and matched, and then the first supporting shell 11 and the second supporting shell 21 are fixedly connected, thereby avoiding the problem of unstable connection caused by misalignment, which is conducive to the accurate docking of the first supporting shell 11 and the second supporting shell 21 when connected.

[0032] In some embodiments, the mating portion of the first support shell 11 may form a protrusion, and the mating portion of the second support shell 21 may form a groove. In other embodiments, the mating portion of the first support shell 11 may form a groove, and the mating portion of the second support shell 21 may form a protrusion. In this way, the first support shell 11 and the second support shell 21 can be aligned and matched through the protrusion and the groove.

[0033] In some embodiments, the second support shell 21 is formed by a plurality of support plates connected to each other in a detachable manner. In such an embodiment, the interior of the second support shell 21 can be entered by removing some support plates, thereby facilitating the repair or replacement of the first collector 22, the second collector 23 and the heat exchange tube 24 in the second support shell 21.

[0034] The inventor of the present application has found that the shell and the pipeline in the related art are usually assembled by welding. When the coolant leaks from the pipeline, it is difficult to repair or replace the pipeline. Therefore, in some embodiments, the first collector 22 and the second collector 23 are respectively fixedly connected to the heat exchange tube 24, and the first collector 22 and the second collector 23 are respectively fixedly connected to the second support shell 21 so that they can be detached. In this way, the first collector 22, the second collector 23 and the heat exchange tube 24 can be easily removed from the second support shell 21 for repair or replacement. That is, the first collector 22, the second collector 23 and the heat exchange tube 24 are removed as a whole for maintenance.

[0035] In some embodiments, the outlet damper housing assembly 30 may include an outlet damper 32 and a third support shell 31. The outlet damper housing assembly 30 is configured such that air from the heat exchange assembly 20 flows out of the third support shell 31 through the outlet damper 32. The outlet damper 32 is disposed on the third support shell 31. The third support shell 31 is configured to be detachably connected to the heat exchange assembly 20. In such an embodiment, when the heat exchange assembly 20 is damaged, the third support shell 31 can be disassembled, so that the heat exchange assembly 20 can be easily repaired or replaced.

[0036] The inventor of the present application has found that the heat exchange tube 24 in the related art is usually a vertical light tube or a vertical fin tube. Although this structure can effectively reduce the air side flow resistance under non-active natural circulation conditions, when the same heat exchange effect needs to be achieved, the structure is not compact enough, resulting in a larger overall volume of the heat exchanger, occupying more process space, thereby increasing the overall cost. Therefore, in some embodiments, the heat exchange tube 24 is configured to have fins formed on its surface, and the heat exchange tube 24 is configured to be able to bend. In such an embodiment, by configuring the heat exchange tube 24 to have a structure with fins on the surface and capable of bending, the heat exchange tube 24 can effectively utilize the internal space of the heat exchanger, which is beneficial to improving the heat exchange efficiency while also improving the compactness of the heat exchanger, effectively reducing the volume of the heat exchanger, thereby helping to reduce the overall cost.

[0037] In some embodiments, the heat exchange tube 24 can be formed in the following manner: fins are welded along a first direction at a first predetermined length of the heat exchange tube 24, and after welding is completed, fins are welded along a second direction at a second predetermined length of the portion of the heat exchange tube 24 where no fins are welded, and a pipeline of a third predetermined length is reserved between the two portions of the heat exchange tube 24 where the fins are welded, and the pipeline can be bent. This arrangement improves the compactness of the heat exchanger while enhancing the heat exchange efficiency, and helps to reduce the volume of the heat exchanger.

[0038] In some embodiments, the bending radius of the bend can be determined according to the heat exchange demand. Specifically, when the heat exchange demand is large, a heat exchange tube 24 with a smaller bending radius can be used to improve the heat exchange efficiency; when the heat exchange demand is small, a heat exchange tube 24 with a larger bending radius can be used to reduce the manufacturing cost.

[0039] See also Figure 2 In some embodiments, the first collector 22 is located above the second collector 23. After the coolant is input into the first collector 22, it flows to the second collector 23 along the heat exchange tube 24. The air inlet damper housing assembly is located below the heat exchange assembly 20, and the outlet damper housing assembly 30 is located above the heat exchange assembly 20. The air enters the first support shell 11 from the inlet damper 12, flows into the second support shell 21, exchanges heat with the coolant in the heat exchange tube 24, and flows out from the outlet damper 32. In this embodiment, the air flows from bottom to top, and the coolant flows from top to bottom. The flow of air and coolant forms a countercurrent, which is conducive to improving the heat exchange efficiency.

[0040] 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.

[0041] The above description is only a specific implementation manner 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 heat exchanger, suitable for a lead-bismuth reactor, characterized in that: It includes: Import damper housing assembly, heat exchange assembly, export damper housing assembly, The inlet damper housing assembly is configured to receive air from the outside; The heat exchange component is configured to receive coolant from the lead-bismuth reactor, and the coolant transfers heat to the air from the inlet damper housing through the heat exchange component and then flows out through the heat exchange component; The outlet damper housing assembly is configured to receive air from the heat exchange assembly and allow the air to flow out therefrom, The inlet damper housing assembly, the heat exchange assembly and the outlet damper housing assembly are detachably connected.

2. The heat exchanger according to claim 1, characterized in that The inlet damper housing assembly comprises: a plurality of inlet dampers and a first supporting shell, wherein the plurality of inlet dampers are arranged on the first supporting shell, a plurality of inlet dampers arranged to receive air from the outside, and The first supporting shell is configured to be detachably connected to the heat exchange assembly.

3. The heat exchanger according to claim 1 or 2, characterized in that: The heat exchange assembly includes a first collector, a second collector, a heat exchange tube, a support frame, and a second support shell. The first current collector is configured to receive the coolant from the lead-bismuth reactor, and the coolant transfers heat to the air from the inlet damper housing through the heat exchange tube and then flows out through the second current collector; The first current collector and the second current collector are respectively fixedly connected to the heat exchange tube. The support frame is configured to support the first current collector and the second current collector, Wherein, the first current collector, the second current collector, the heat exchange tube, and the support frame are arranged in the second support shell. The second supporting shell is configured to be detachably connected to the first supporting shell.

4. The heat exchanger according to claim 3, characterized in that The first supporting shell and the second supporting shell are respectively provided with corresponding matching parts. When the first supporting shell is fixedly connected, the matching parts of the first supporting shell and the matching parts of the second supporting shell are first aligned and matched, and then the first supporting shell and the second supporting shell are fixedly connected.

5. The heat exchanger according to claim 3 or 4, characterized in that: The second supporting shell is formed by a plurality of supporting plates that are detachably connected to each other.

6. The heat exchanger according to claim 3 or 4, characterized in that: The first current collector and the second current collector are respectively detachably fixedly connected to the second supporting shell.

7. The heat exchanger according to claim 1, characterized in that The outlet damper housing assembly comprises an outlet damper and a third supporting shell. and arranged so that the air from the heat exchange assembly flows out of the third support shell through the outlet damper, The outlet damper is arranged on the third supporting shell, The third supporting shell is configured to be detachably connected to the heat exchange assembly.

8. The heat exchanger according to any one of claims 1 to 7, characterized in that: The heat exchange tube is configured to have fins formed on the surface thereof, and the heat exchange tube is configured to be bendable.

9. The heat exchanger according to claim 8, characterized in that The heat exchange tube is formed in the following manner: welding fins along a first direction on a first predetermined length of the heat exchange tube, After the welding is completed, the fins are welded along the second direction on the second predetermined length of the portion of the heat exchange tube where the fins are not welded. A pipeline of a third predetermined length is reserved between the two parts of the heat exchange tube to which the fins are welded, and the pipeline can be bent.

10. The heat exchanger according to claim 9, characterized in that The bending radius of the bend is determined according to heat exchange requirements.

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