Coupled high-temperature and low-pressure heat exchanger and manufacturing method thereof

Abstract

This application belongs to the technical field of nuclear heat exchangers, and discloses a coupled high-temperature and low-pressure heat exchanger and its manufacturing method. The heat exchanger includes a first heat exchange module, a second heat exchange module, an inlet pipe, and an outlet pipe. The first heat exchange module has an upper header of the first module, a lower header of the first module, a secondary pipe system of the first module, and a primary pipe system of the first module. The fluids in the secondary pipe system and the primary pipe system of the first module flow in opposite directions. The second heat exchange module has an upper header of the second module, a lower header of the second module, a secondary pipe system of the second module, a primary pipe system of the second module, and a primary-side through-flow channel of the second module. The fluids in the secondary pipe system and the primary pipe system of the second module flow in opposite directions. The manufacturing method prints the first heat exchange module and the second heat exchange module as a whole and forms them by printing upward along the radial direction. This application can improve the heat efficiency and system economy, reduce the complexity of the primary-side body circulation flow field, and improve the flow field uniformity at the same time.

Description

Technical Field

[0001] This application belongs to the technical field of nuclear heat exchangers, and particularly relates to a coupled high-temperature and low-pressure heat exchanger and a manufacturing method thereof. Background Art

[0002] At present, most of the existing heat exchangers adopt a shell-and-tube structure. Restricted by factors such as the manufacturability of equipment components and the operability of assembly, in application scenarios with large heat transfer capacity or complex heat transfer requirements, the method of increasing the equipment volume and the number of equipment is adopted, which requires a large space for layout and increases the investment cost.

[0003] The existing heat exchanger is a single independent device and has a cylindrical shape, which is prone to unevenness of the primary side external flow field. And each loop needs to be equipped with a heat exchanger, so that multiple heat exchangers in the primary side external flow field are arranged simultaneously, resulting in a complex flow channel in the primary side external flow field. Summary of the Invention

[0004] The main purpose of this application is to provide a coupled high-temperature and low-pressure heat exchanger, which improves the thermal efficiency and system economy, reduces the complexity of the primary side body circulation flow field, and improves the flow field uniformity at the same time.

[0005] Another purpose of this application is to provide a manufacturing method of a coupled high-temperature and low-pressure heat exchanger, which integrally manufactures a high-temperature and low-pressure heat exchanger with multiple heat exchange modules coupled by using additive manufacturing technology, so as to improve the safety and economy of engineering projects.

[0006] In order to achieve the above purposes, this application provides the following technical solutions:

[0007] In the first aspect, this application provides a coupled high-temperature and low-pressure heat exchanger, which includes an integrally formed heat exchange module one and heat exchange module two. The heat exchange module two is arranged above the heat exchange module one. There is an intermediate connection box between the heat exchange module one and the heat exchange module two. The secondary side inlet pipe of module one and the secondary side outlet pipe of module one are inserted into the heat exchange module one for arrangement, and the secondary side inlet pipe of module two and the secondary side outlet pipe of module two are inserted into the heat exchange module two for arrangement;

[0008] The upper part of the heat exchange module one is provided with an upper header of module one, the lower part is provided with a lower header of module one, and the inside is provided with a secondary side pipe system of module one and a primary side pipe system of module one. The fluids in the secondary side pipe system of module one and the primary side pipe system of module one flow in opposite directions;

[0009] The upper part of the second heat exchange module is provided with an upper header of the second module, the lower part is provided with a lower header of the second module, and the interior is provided with a secondary pipe system of the second module, a primary pipe system of the second module, and a primary through-flow channel of the second module. The fluids in the secondary pipe system of the second module and the primary pipe system of the second module flow in opposite directions, and the primary through-flow channel of the second module communicates with the primary pipe system of the second module.

[0010] In some embodiments, the number of the second heat exchange modules is 2, which are symmetrically arranged on both sides of the secondary inlet pipe of the first module.

[0011] In some embodiments, the cross-sectional area of the second heat exchange module is 1 / 3 of that of the first heat exchange module, and the height is 1 / 20 of that of the first heat exchange module.

[0012] In some embodiments, the secondary pipe system of the first module and the primary pipe system of the first module are arranged in an alternating manner, and the secondary pipe system of the second module and the primary pipe system of the second module are arranged in an alternating manner.

[0013] In some embodiments, the secondary pipe system of the first module communicates with the upper header of the first module and the lower header of the first module; the primary pipe system of the first module communicates with the intermediate connection box and connects to the primary fluid outlet.

[0014] In some embodiments, the secondary pipe system of the second module communicates with the upper header of the second module and the lower header of the second module; the primary pipe system of the second module communicates with the upper header of the first module and the lower header of the second module.

[0015] In some embodiments, the secondary inlet pipe of the first module communicates with the lower header of the first module, and the secondary outlet pipe of the first module communicates with the upper header of the first module.

[0016] In some embodiments, the secondary inlet pipe of the second module communicates with the lower header of the second module, and the secondary outlet pipe of the second module communicates with the upper header of the second module.

[0017] In some embodiments, the first heat exchange module and the second heat exchange module are connected by a connecting plate, and the connecting plate is a hollow connecting plate.

[0018] In a second aspect, the present application provides a method for manufacturing the described coupled high-temperature and low-pressure heat exchanger. The first heat exchange module and the second heat exchange module are printed and formed upward along the radial direction. The primary side pipe system, secondary side pipe system structure, and upper and lower headers in the first heat exchange module and the second heat exchange module are integrally formed by 3D printing. The entire module is printed as a whole, that is, the secondary side pipe system of the first module, the primary side pipe system of the first module, the upper header of the first module, and the lower header of the first module are integrally formed by 3D printing. The secondary side pipe system of the second module, the primary side pipe system of the second module, the upper header of the second module, and the lower header of the second module in the second heat exchange module are integrally formed by 3D printing.

[0019] Compared with the prior art, the coupled high-temperature and low-pressure heat exchanger and its manufacturing method provided by the present application have the following beneficial effects:

[0020] In the present application, multiple-loop heat exchangers are coupled into an integrated device, reducing the overall occupied space. The hierarchical arrangement of the heat exchange modules corresponding to different loops enhances the natural circulation ability in the external circulation system and improves the heat exchange efficiency of the passive natural circulation module. At the same time, the design of sharing part of the primary side flow path reduces the complexity of the flow field in the primary side body circulation. The application of additive manufacturing technology enables the shape of the heat exchanger to be designed in matching special and irregular shapes according to the actual primary side flow field. Increasing the number of primary side flow path inlets can make the primary side flow field more uniform.

[0021] The coupled high-temperature and low-pressure heat exchanger provided by the present application arranges the second heat exchange module at a high position, enhancing the natural circulation ability and improving the safety and heat exchange efficiency.

[0022] The present application designs the heat exchange cycle path of the second heat exchange module to be the same as the main heat exchange cycle path of the first heat exchange module, reducing the heat exchange complexity of the second heat exchange module. The main primary side circulation path designed in the present application is: the primary side fluid inlet of the second module → the primary side pipe system of the second module → the intermediate connection box → the primary side pipe system of the first module → the primary side fluid outlet.

[0023] In addition, the manufacturing method of the coupled high-temperature and low-pressure heat exchanger provided by the present application adopts additive manufacturing technology, which can realize more special-shaped structure designs of the heat exchanger, can form a wider primary side fluid inlet to the greatest extent, and makes the external environment flow field of the heat exchanger more uniform. The integrated 3D printing and forming method reduces the assembly process of traditional heat exchanger equipment components and can realize on-site processing and manufacturing near the factory area, having great advantages in the overall equipment supply cycle such as equipment manufacturing and transportation.

[0024] The present application adopts coupled manufacturing, reducing the volume occupied by the equipment, further reducing the space requirement for equipment layout, and thus reducing the overall project cost. Brief Description of the Drawings

[0025] To more clearly illustrate the technical solutions of the present application, the drawings required for the technical description will be briefly introduced below.

[0026] Figure 1 It is a schematic structural diagram of a coupled high-temperature and low-pressure heat exchanger provided by an embodiment of the present application, in which the connecting plate is not shown;

[0027] Figure 2 It is a schematic diagram of the flow direction of the primary-side fluid of the coupled high-temperature and low-pressure heat exchanger provided by an embodiment of the present application;

[0028] Figure 3 It is a schematic diagram of the flow direction of the secondary-side fluid of Module 1 provided by an embodiment of the present application;

[0029] Figure 4 It is a top view of the coupled high-temperature and low-pressure heat exchanger provided by an embodiment of the present application;

[0030] Figure 5 It is a schematic structural diagram of the coupled high-temperature and low-pressure heat exchanger connected by a connecting plate provided by an embodiment of the present application;

[0031] Figure 6 For Figure 1 The following part of the upper header box of Heat Exchange Module 2 along the A direction in

[0032] Figure 7 For Figure 6 The sectional view of Heat Exchange Module 2 along the B direction in

[0033] Figure 8 For Figure 6 The sectional view of Heat Exchange Module 2 along the C direction in

[0034] Figure 9 For Figure 6 The sectional view of Heat Exchange Module 2 along the D direction in

[0035] Figure 10 For Figure 1 The top view of Heat Exchange Module 1 along the E direction in

[0036] Figure 11 For Figure 10 The sectional view of Heat Exchange Module 1 along the F direction in

[0037] Figure 12 For Figure 10 The sectional view of Heat Exchange Module 1 along the G direction in

[0038] Figure 13 For Figure 10 The sectional view of Heat Exchange Module 1 along the H direction in

[0039] Description of Reference Numerals

[0040] 1. First heat exchange module; 2. Second heat exchange module; 3. Upper header of module two; 4. Lower header of module two; 5. Secondary piping system of module two; 6. Primary piping system of module two; 7. Intermediate connection box; 8. Secondary side inlet pipe of module one; 9. Secondary side outlet pipe of module one; 10. Upper header of module one; 11. Lower header of module one; 12. Secondary piping system of module one; 13. Primary piping system of module one; 14. Secondary side inlet pipe of module two; 15. Secondary side outlet pipe of module two; 16. Secondary side outlet of module two; 17. Secondary side inlet of module two; 18. Secondary side outlet of module one; 19. Secondary side inlet of module one; 20. Primary side fluid outlet; 21. Primary side through-flow channel of module two; 22. Connecting plate. Detailed Description of the Invention

[0041] The following provides a more detailed description through specific embodiments.

[0042] As Figures 1 to 13 shown, an embodiment of the present application provides a coupled high-temperature and low-pressure heat exchanger, including a first heat exchange module 1 and a second heat exchange module 2, which is a high-temperature and low-pressure heat exchanger that realizes the coupling of double heat exchangers by using additive manufacturing technology. The first heat exchange module 1 and the second heat exchange module 2 are integrally formed structures, and a connecting plate 22 is designed for connection.

[0043] A connecting plate 22 is arranged between the first heat exchange module 1 and the second heat exchange module 2, and the first heat exchange module 1, the connecting plate 22, and the second heat exchange module 2 are integrally formed by additive manufacturing (3D printing).

[0044] In one embodiment, the connecting plate 22 is a partially hollow structure to meet the requirements of some of the original primary side fluid flow channels.

[0045] The secondary side inlet pipe 14 and the secondary side outlet pipe 15 of module two are inserted into the second heat exchange module 2 and arranged longitudinally. The secondary side inlet pipe 14 of module two is connected to the lower header 4 of module two, and the secondary side outlet pipe 15 of module two is connected to the upper header 3 of module two. Optionally, the secondary side outlet pipe 15 of module two is sleeved outside the secondary side inlet pipe 14 of module two, and the secondary side outlet pipe 15 of module two has a transverse outlet portion, and the secondary side outlet 16 of module two is arranged horizontally.

[0046] The module-secondary side inlet pipe 8 and the module-secondary side outlet pipe 9 are inserted into the heat exchange module-1 and arranged longitudinally. The module-secondary side inlet pipe 8 is connected to the lower header box 11 of the module, and the module-secondary side outlet pipe 9 is connected to the upper header box 10 of the module-1. Optionally, the module-secondary side outlet pipe 9 is sleeved outside the module-secondary side inlet pipe 8, the module-secondary side outlet pipe 9 has a transverse outlet portion, and the module-secondary side outlet 18 is arranged transversely.

[0047] like Figure 2 As shown, the flow direction of the primary side fluid of the coupled high-temperature low-pressure heat exchanger is: the primary side flow inlet of module two (the flow channel opening on the surface of the heat exchange module) → the primary side pipe system 6 of module two → the intermediate connecting box 7 → the primary side pipe system 13 of module one → the primary side fluid outlet 20.

[0048] like Figure 3 As shown, the secondary side fluid flow direction of module one is: module one secondary side inlet 19 → module one secondary side inlet pipe 8 → module one lower header box 11 → module one secondary side pipe system 12 → module one upper header box 10 → module one secondary side outlet pipe 9 → module one secondary side outlet 18.

[0049] The secondary side fluid flow direction of module two is: module two secondary side inlet 17 → module two secondary side inlet pipe 14 → module two lower header box 4 → module two secondary side pipe system 5 → module two upper header box 3 → module two secondary side outlet pipe 15 → module two secondary side outlet 16.

[0050] Among them, the primary side fluid flows from top to bottom in the vertical direction inside the heat exchange module 1 and the heat exchange module 2, and the secondary side fluid flows from bottom to top in the vertical direction inside the heat exchange module 1 and the heat exchange module 2, forming a counter-current design of primary and secondary heat exchange to reduce the temperature difference between the cold and hot ends. That is, the fluid in the secondary side pipe system 5 of module 2 and the primary side pipe system 6 of module 2 counter-flow, and the fluid in the secondary side pipe system 12 of module 1 and the primary side pipe system 13 of module 1 counter-flow.

[0051] Figure 1 In the figure, the curved shear head and the hollow shear head both indicate the direction of fluid flow. The curved arrows in the module represent the flow direction of the secondary side fluid, and the four curved arrows on both sides of the device represent the flow direction of the primary side fluid; the longer hollow arrows of the six secondary side inlet and outlet pipes represent the flow direction of the secondary side fluid, and the remaining shorter hollow arrows represent the flow direction of the primary side fluid. The four solid dots represent the inlet of the transverse through-flow channel 21 on the primary side of module 2. Figure 2 In the figure, the solid arrow indicates the flow direction of the fluid on the primary side; Figure 3 In the figure, the solid arrows indicate the flow routes of the fluid on the primary and secondary sides of the module.

[0052] The number of the second heat exchange modules 2 is 2, and the two second heat exchange modules 2 are arranged above the first heat exchange module 1. The cross-sectional area of each second heat exchange module 2 is 1 / 3 of that of the first heat exchange module 1, and the height is 1 / 20 of that of the first heat exchange module 1; the heat exchange area of each second heat exchange module 2 is 1.5% of that of the first heat exchange module 1; under the same conditions, the power of each second heat exchange module 2 is 1.5% of that of the first heat exchange module 1.

[0053] This embodiment is provided with two second heat exchange modules 2 and one first heat exchange module 1. The two types of modules share the primary side fluid, but the secondary side fluids of the two types of modules are independent of each other. The secondary side of the second heat exchange module 2 is connected to the process system of one loop, and the secondary side of the first heat exchange module 1 is connected to the process system of another loop.

[0054] In one embodiment, the coupled high-temperature and low-pressure heat exchanger includes two second heat exchange modules 2 and one first heat exchange module 1, a total of three heat exchange modules. Their secondary sides can be respectively connected to three independent loop process systems, and the secondary side fluids of the three heat exchange modules can use three different media.

[0055] The first heat exchange module 1 and the second heat exchange module 2 are manufactured by additive manufacturing (3D printing), directly printed and formed upward in the radial direction, and the structures of the primary side pipe system and the secondary side pipe system in the module are also integrally formed by 3D printing. In this embodiment, there are only the secondary side inlet pipes and outlet pipes of the two heat exchange modules (i.e., the first module secondary side inlet pipe 8, the first module secondary side outlet pipe 9, the second module secondary side inlet pipe 14, and the second module secondary side outlet pipe 15). The secondary side inlet pipes and outlet pipes are in an assembly relationship with the heat exchange modules. The secondary side inlet pipes and outlet pipes are manufactured separately and then installed on the heat exchange modules. When assembling, they are inserted from top to bottom, and the bottom of the inlet pipe and the lower header, and the bottom of the outlet pipe and the upper header use labyrinth sealing components to achieve interference sealing. Welding sealing can be carried out at the bottom of the outlet pipe of the second heat exchange module 2 and the upper header.

[0056] The upper half of the coupled high-temperature and low-pressure heat exchanger provided in this embodiment is the second heat exchange module 2. A secondary side header is provided above and below the second heat exchange module 2, that is, the second module upper header 3 located in the upper part and the second module lower header 4 located in the lower part. The second module lower header 4 is used to distribute the secondary side fluid entering the second heat exchange module 2 into the heat exchange channels (the second module secondary side pipe system 5); the second module upper header 3 is used to collect and flow out the secondary side fluid that has completed heat exchange from the second heat exchange module 2. A through-flow channel (the second module primary side through-flow channel 21) of the primary side fluid is arranged inside the second heat exchange module 2 near the position of the second module upper header 3, and the primary fluid enters from the side inlet window ( Figure 5In [the figure], [the fluid] enters the through-flow channel (the primary through-flow channel 21 of Module 2) from the inlet of the primary side of Module 2, enters the primary pipe system 6 of Module 2 after free distribution, then converges through the intermediate connection box 7 at the lower part, and enters the primary pipe system 13 of Module 1 after free distribution.

[0057] As Figures 1 to 5 shown, the number and position of the primary through-flow channels 21 of Module 2 are set according to actual calculation conditions. Only one horizontal line is drawn in the figure for exemplary illustration.

[0058] As Figures 6 to 9 shown, the secondary pipe system 5 and the primary pipe system 6 of Module 2 are arranged inside the heat exchange Module 2. The secondary pipe system 5 and the primary pipe system 6 of Module 2 are arranged in an alternating manner. As Figure 6 shown, the solid coils (the secondary pipe system 5 of Module 2) represent the secondary side flow channels, and the dashed coils (the primary pipe system 6 of Module 2) represent the primary side flow channels. They are arranged in parallel with each other. Among them, the shapes of the primary side flow channels and the secondary side flow channels are not necessarily circular channels, but can also be square. Specifically, they are determined by comprehensive design and calculation according to various factors such as the actual flow channels and flow resistances. In this embodiment, the circular illustration is only for example. The fluids in the secondary pipe system 5 and the primary pipe system 6 of Module 2 flow in opposite directions. The secondary pipe system 5 of Module 2 flows from bottom to top, and the primary pipe system 6 of Module 2 flows from top to bottom. The primary through-flow channel 21 of Module 2 is connected to the primary pipe system 6 of Module 2.

[0059] The fluid route of the heat exchange Module 2 is as follows:

[0060] Secondary side: The secondary side fluid enters the secondary inlet pipe 14 of Module 2 from the inlet (the secondary inlet 17 of Module 2), enters the lower collecting box 4 of Module 2 in the heat exchange Module 2, enters the secondary pipe system 5 of Module 2 after distribution, flows from bottom to top into the upper collecting box 3 of Module 2 in the heat exchange Module 2, and then flows out of the coupled high-temperature and low-pressure heat exchanger through the secondary side outlet pipe 15. At this time, the secondary side fluid leaves the coupled high-temperature and low-pressure heat exchanger and enters the process system pipeline.

[0061] Primary side: The primary side fluid enters the heat exchange Module 2 from the through-flow channel (the primary through-flow channel 21 of Module 2). The fluid enters the primary pipe system 6 of Module 2 in the heat exchange Module 2 from top to bottom after distribution, exchanges heat with the secondary side fluid in a countercurrent manner, and then enters the intermediate connection box 7.

[0062] The lower half of the coupled high-temperature and low-pressure heat exchanger provided in this embodiment is the first heat exchange module 1. The primary-side flow area of the first heat exchange module 1 is relatively large, and it is designed with low flow resistance to reduce the flow resistance of the primary-side fluid in the heat exchanger. The upper part of the primary side corresponding to the inlet window is in a fully-through mode. The primary-side pipe system 13 of the first module is directly connected to the intermediate connection box 7, serving as the inlet for the primary-side fluid of the first module to enter the heat exchange module 1. The inlet window part is Figure 1 the position indicated by the hollow arrow at the bottom of the intermediate connection box 7. The upper hollow arrow above the intermediate connection box 7 is a schematic diagram of the route for part of the primary-side fluid to enter the intermediate connection box from the external flow field.

[0063] One upper and one lower collector boxes for the secondary side are provided in the first heat exchange module 1, namely the upper collector box 10 of the first module located at the upper part and the lower collector box 11 of the first module located at the lower part. The function of the lower collector box 11 of the first module is to diffuse the cold fluid entering the heat exchanger module 1 from the external system, so that it can be freely distributed into the secondary-side pipe system. The function of the upper collector box 10 of the first module is to collect the heated secondary-side fluid in the secondary-side pipe system of the first module, so that it can flow out from the secondary-side outlet pipe 9 of the first module in a concentrated manner.

[0064] As Figures 10 to 13 shown, the first heat exchange module 1 is internally provided with a secondary-side pipe system 12 and a primary-side pipe system 13 of the first module. The secondary-side pipe system 12 and the primary-side pipe system 13 of the first module are arranged in an alternating manner. As Figure 10 shown, the solid circles (the primary-side pipe system 13 of the first module) represent the primary-side flow channels, and the dotted circles (the secondary-side pipe system 12 of the first module) represent the secondary-side flow channels. They are arranged side by side with each other; among them, the shapes of the primary-side flow channels and the secondary-side flow channels are not necessarily circular channels, and they can also be square. Specifically, they are determined by comprehensive design and calculation according to various factors such as the actual flow channels and flow resistance. In this embodiment, the circular illustration is only for example. The fluids in the secondary-side pipe system 12 and the primary-side pipe system 13 of the first module flow in opposite directions. The flow direction of the secondary-side pipe system 12 of the first module is from bottom to top, and the flow direction of the primary-side pipe system 13 of the first module is from top to bottom.

[0065] The fluid route of the first heat exchange module 1 is as follows:

[0066] Secondary side: The secondary-side fluid enters the secondary-side inlet pipe 8 of the first module from the inlet, enters the lower collector box 11 of the first module of the heat exchange module 1, is distributed and then enters the secondary-side pipe system 12 of the first module, flows from bottom to top into the upper collector box 10 of the first module of the heat exchange module 1, and after being collected, flows out of the coupled high-temperature and low-pressure heat exchanger through the secondary-side outlet pipe 9 of the first module;

[0067] Primary side: The primary side fluid of the first heat exchange module 1 converges at the middle connection box 7 from two parts. One part is the primary side fluid that has completed heat exchange in the second heat exchange module 2, and the other part is the external fluid that directly enters the middle connection box 7 from the gap between the two components of the first heat exchange module 1 and the second heat exchange module 2. After confluence and distribution, it enters the primary side pipe system 13 of the first heat exchange module 1 from top to bottom, and directly flows out of the coupled high-temperature and low-pressure heat exchanger after countercurrent heat exchange with the secondary side fluid. At this time, the primary side fluid leaves the coupled high-temperature and low-pressure heat exchanger and enters the primary side fluid field.

[0068] Preferably, a notch is provided on the side of the second heat exchange module 2 to allow the pipes of the first heat exchange module 1 to pass through. A certain gap is left between the two heat exchange modules to allow the second heat exchange module 2 to expand thermally freely. The outer shell of the first heat exchange module 1 extends upward beyond the lower part of the second heat exchange module 2 to allow the primary side fluid to enter the first heat exchange module 1.

[0069] As Figure 1 shown, the primary side fluid outlet 20 is for open-air discharge, and the four inlets and outlets of the secondary side outlet 16 of the second module, the secondary side inlet 17 of the second module, the secondary side outlet 18 of the first module, and the secondary side inlet 19 of the first module are represented as corresponding system pipe interfaces.

[0070] In addition, the embodiment of the present application also provides a manufacturing method of a coupled high-temperature and low-pressure heat exchanger. By using additive manufacturing technology, multiple heat exchangers required in existing projects are reduced to heat exchange modules and designed to be coupled into a heat exchanger device. This device has the equipment function of multi-loop heat exchange, while reducing the volume of the heat exchanger, effectively reducing the layout space of engineering applications, and can significantly reduce project investment and improve project economy.

[0071] The first heat exchange module 1 and the second heat exchange module 2 are manufactured by additive manufacturing (3D printing), directly printed and formed upward in the radial direction, and the structures of the primary side pipe system and the secondary side pipe system inside the module are also integrally formed by 3D printing. The upper manifold and the lower manifold are also integrally formed, that is, the first heat exchange module 1 and the second heat exchange module 2 are 3D printed as a whole.

[0072] In this embodiment, there are only the secondary side inlet pipes and outlet pipes of the two heat exchange modules (i.e., the secondary side inlet pipe 8 of the first module, the secondary side outlet pipe 9 of the first module, the secondary side inlet pipe 14 of the second module, and the secondary side outlet pipe 15 of the second module), and the secondary side inlet pipes and outlet pipes are in an assembly relationship with the heat exchange modules.

[0073] The manufacturing method of this embodiment adopts additive manufacturing technology, which can break through the limitations of the manufacturing process of traditional shell-and-tube heat exchangers. The multi-module coupling can meet the requirements of multi-loop and complex heat exchange. The staggered arrangement of heat exchange tube systems in different loops (the primary side tube system and the secondary side tube system of the heat exchange module, the secondary side tube system 5 of module two, the primary side tube system 6 of module two, the secondary side tube system 12 of module one, and the primary side tube system 13 of module one) can effectively reduce the volume of the equipment, and reduce the project investment in terms of the overall manufacturing cycle and the volume of the equipment.

[0074] In this embodiment, the manufacturing method is to specifically manufacture a heat exchanger applicable to high-temperature and low-pressure environments, and it is necessary to overcome the manufacturing constraints, mainly in two aspects: one is the lack of metal powder raw materials corresponding to special metal materials and the experience of using additive manufacturing technology for corresponding metal materials; on the other hand, there has been no printing engineering experience for super-large equipment components with a diameter exceeding 8m, and it is impossible to complete the printing and manufacturing of a single device.

[0075] For the first factor, this embodiment adopts the engineering application of additive manufacturing technology for titanium alloy / super-titanium alloy materials, and subsequent improvements can be made to the metal powder materials and printing technology according to the material performance requirements.

[0076] For the second factor, it can be achieved by setting multiple devices to print and manufacture simultaneously.

[0077] In this embodiment, the problem of thermal expansion needs to be considered. The heat exchange modules of the heat exchanger are integrally formed by additive manufacturing technology (3D printing). The thermal expansion of the heat exchange modules mainly considers the thermal expansion in the vertical direction. In this embodiment, an intermediate connection box 7 is provided between the heat exchange module one 1 and the heat exchange module two 2 to provide expansion space for the heat exchange modules. However, the intermediate connection box 7 is essentially a cavity structure and is not the connection structure between the heat exchange module one 1 and the heat exchange module two 2, that is, the heat exchange module one 1 and the heat exchange module two 2 are not directly connected, but are connected through a connecting plate 22.

[0078] The coupled high-temperature and low-pressure heat exchanger manufactured by the manufacturing method provided in this embodiment has all the functions of the above embodiments.

[0079] The above is only the specific implementation manner of this application, but the protection scope of this application is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed in this application should be covered by the protection scope of this application.

Claims

1. A coupled high-temperature and low-pressure heat exchanger, characterized in that, It includes an integrally formed heat exchange module one (1) and a heat exchange module two (2). The heat exchange module two (2) is arranged above the heat exchange module one (1). An intermediate connection box (7) is provided between the heat exchange module one (1) and the heat exchange module two (2). The secondary side inlet pipe (8) of module one and the secondary side outlet pipe (9) of module one are inserted into the heat exchange module one (1) for arrangement. The secondary side inlet pipe (14) of module two and the secondary side outlet pipe (15) of module two are inserted into the heat exchange module two (2) for arrangement; The upper part of the heat exchange module one (1) is provided with an upper header tank of module one (10), the lower part is provided with a lower header tank of module one (11), and the interior is provided with a secondary side pipe system of module one (12) and a primary side pipe system of module one (13). The fluids in the secondary side pipe system of module one (12) and the primary side pipe system of module one (13) flow in opposite directions; The upper part of the heat exchange module two (2) is provided with an upper header tank of module two (3), the lower part is provided with a lower header tank of module two (4), and the interior is provided with a secondary side pipe system of module two (5), a primary side pipe system of module two (6) and a primary side through-flow channel of module two (21). The fluids in the secondary side pipe system of module two (5) and the primary side pipe system of module two (6) flow in opposite directions. The primary side through-flow channel of module two (21) is communicated with the primary side pipe system of module two (6); The primary side fluid enters the primary side through-flow channel of module two (21), and after free distribution, it enters the primary side pipe system of module two (6), and then converges and is freely distributed through the intermediate connection box (7) and enters the primary side pipe system of module one (13).

2. The coupled high-temperature and low-pressure heat exchanger according to claim 1, wherein The number of the heat exchange modules two (2) is 2, and they are symmetrically arranged on both sides of the secondary side inlet pipe (8) of module one.

3. The coupled high-temperature and low-pressure heat exchanger according to claim 1, wherein The cross-sectional area of the heat exchange module two (2) is 1 / 3 of that of the heat exchange module one (1), and the height is 1 / 20 of that of the heat exchange module one (1).

4. The coupled high-temperature and low-pressure heat exchanger according to claim 1, wherein The secondary side pipe system of module one (12) and the primary side pipe system of module one (13) are arranged in a staggered manner. The secondary side pipe system of module two (5) and the primary side pipe system of module two (6) are arranged in a staggered manner.

5. The coupled high-temperature and low-pressure heat exchanger according to claim 1, characterized in that, The secondary side pipe system of module one (12) communicates the upper header tank of module one (10) and the lower header tank of module one (11); The primary side pipe system of module one (13) communicates with the intermediate connection box (7) and connects to the primary side fluid outlet (20).

6. The coupled high-temperature and low-pressure heat exchanger according to claim 1, characterized in that The secondary side pipe system of module two (5) communicates the upper header tank of module two (3) and the lower header tank of module two (4).

7. The coupled high-temperature and low-pressure heat exchanger according to claim 1, wherein The secondary side inlet pipe (8) of module one communicates with the lower header tank of module one (11), and the secondary side outlet pipe (9) of module one communicates with the upper header tank of module one (10).

8. The coupled high-temperature and low-pressure heat exchanger according to claim 1, wherein The secondary side inlet pipe (14) of module two communicates with the lower header tank of module two (4), and the secondary side outlet pipe (15) of module two communicates with the upper header tank of module two (3).

9. The coupled high-temperature and low-pressure heat exchanger according to claim 1, characterized in that The heat exchange module one (1) and the heat exchange module two (2) are connected by a connecting plate (22), and the connecting plate (22) is a hollow connecting plate.

10. A method for manufacturing a coupled high-temperature and low-pressure heat exchanger as claimed in any one of claims 1 to 9, characterized in that, The heat exchange module one (1) and the heat exchange module two (2) are printed and formed upward along the radial direction. The module one secondary side pipe system (12), the module one primary side pipe system (13), the module one upper header (10) and the module one lower header (11) of the heat exchange module one (1) are integrally formed by 3D printing. The module two secondary side pipe system (5), the module two primary side pipe system (6), the module two upper header (3) and the module two lower header (4) of the heat exchange module two (2) are integrally formed by 3D printing.

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