Coupling type high-temperature and low-pressure heat exchanger and manufacturing method thereof

Abstract

The invention belongs to the technical field of nuclear power heat exchangers, and discloses a coupling type high-temperature and low-pressure heat exchanger and a manufacturing method thereof.The heat exchanger comprises a first heat exchange module, a second heat exchange module, an inlet pipe and an outlet pipe; the first heat exchange module is provided with a first module upper collecting box, a first module lower collecting box, a first module secondary side pipe system and a first module primary side pipe system, and fluid in the first module secondary side pipe system and fluid in the first module primary side pipe system flow reversely. The second heat exchange module is provided with a second module upper collecting box, a second module lower collecting box, a second module secondary side pipe system, a second module primary side pipe system and a second module primary side penetrating flow channel. Fluid in the second module secondary side pipe system and fluid in the second module primary side pipe system flow reversely. According to the manufacturing method, the first heat exchange module and the second heat exchange module are printed as a whole and upwards printed and formed in the radial direction. The heat efficiency and the system economy can be improved, the complexity of a primary side body circulating flow field is reduced, and meanwhile the uniformity of the flow field is improved.

Description

Technical Field

[0001] The present application belongs to the technical field of nuclear power heat exchangers, and in particular, 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. Due to factors such as the accessibility of equipment component processing and manufacturing and the operability of assembly, application scenarios with large heat exchange or complex heat exchange requirements adopt the method of increasing the size of the equipment and the number of equipment, which requires a larger space for layout and increases the investment cost.

[0003] The existing heat exchanger is a single independent device with a cylindrical shape, which easily causes unevenness in the primary side external flow field. Different loops need to be equipped with a heat exchanger, so that multiple heat exchangers in the primary side external flow field are arranged at the same time, making the flow path of the primary side external flow field complicated. Summary of the invention

[0004] The main purpose of the present application is to provide a coupled high-temperature, low-pressure heat exchanger to improve thermal efficiency and system economy, reduce the complexity of the primary-side body circulation flow field, and improve the uniformity of the flow field.

[0005] Another object of the present application is to provide a method for manufacturing a coupled high-temperature and low-pressure heat exchanger, which uses additive manufacturing technology to integrally manufacture a high-temperature and low-pressure heat exchanger coupled with multiple heat exchange modules to improve the safety and economy of the engineering project.

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

[0007] In a first aspect, the present application provides a coupled high-temperature low-pressure heat exchanger, comprising an integrally formed heat exchange module 1 and a heat exchange module 2, wherein the heat exchange module 2 is arranged above the heat exchange module 1, an intermediate connecting box is arranged between the heat exchange module 1 and the heat exchange module 2, a secondary side inlet pipe of the module 1 and a secondary side outlet pipe of the module 1 are inserted into the heat exchange module 1, and a secondary side inlet pipe of the module 2 and a secondary side outlet pipe of the module 2 are inserted into the heat exchange module 2;

[0008] The heat exchange module 1 is provided with an upper module header tank at the top and a lower module header tank at the bottom, and is provided with a secondary module pipe system and a primary module pipe system inside, and the fluids in the secondary module pipe system and the primary module pipe system flow in the opposite direction;

[0009] The upper part of the heat exchange module 2 is provided with a module 2 upper collecting box, and the lower part is provided with a module 2 lower collecting box. The module 2 secondary side pipe system, the module 2 primary side pipe system and the module 2 primary side through-flow channel are provided inside. The fluid in the module 2 secondary side pipe system and the module 2 primary side pipe system flows in the opposite direction, and the module 2 primary side through-flow channel is connected with the module 2 primary side pipe system.

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

[0011] In some embodiments, the cross-sectional area of ​​the heat exchange module 2 is 1 / 3 of that of the heat exchange module 1, and the height is 1 / 20 of that of the heat exchange module 1.

[0012] In some embodiments, the secondary piping system of module one and the primary piping system of module one are arranged alternately, and the secondary piping system of module two and the primary piping system of module two are arranged alternately.

[0013] In some embodiments, the module-secondary side pipe system is connected to the module-upper collecting box and the module-lower collecting box; the module-primary side pipe system is connected to the intermediate connecting box and connected to the primary side fluid outlet.

[0014] In some embodiments, the secondary side pipe system of module two connects the upper collecting tank of module two and the lower collecting tank of module two; the primary side pipe system of module two connects the upper collecting tank of module one and the lower collecting tank of module two.

[0015] In some embodiments, the module-secondary side inlet pipe is connected to a lower collecting tank of the module, and the module-secondary side outlet pipe is connected to an upper collecting tank of the module.

[0016] In some embodiments, the secondary side inlet pipe of module two is connected to the lower collecting tank of module two, and the secondary side outlet pipe of module two is connected to the upper collecting tank of module two.

[0017] In some embodiments, the heat exchange module 1 and the heat exchange module 2 are connected via a connecting plate, and the connecting plate is a hollow connecting plate.

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

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

[0020] In the present application, the multi-circuit heat exchanger is coupled into an integrated device to reduce the overall space occupied. The layered arrangement of heat exchange modules corresponding to different circuits enhances the natural circulation capacity in the external circulation system and improves the heat exchange efficiency of the passive natural circulation module. At the same time, the design of the shared primary side flow channel reduces the complexity of the flow field in the primary side body circulation. The application of additive manufacturing technology enables the heat exchanger to be designed with matching special and irregular shapes according to the actual primary side flow field. Increasing the number of primary side flow channel inlets can make the primary side flow field more uniform.

[0021] The coupled high-temperature and low-pressure heat exchanger provided in the present application is designed to arrange the heat exchange module 2 at a high position, thereby enhancing the natural circulation capacity and improving the safety and heat exchange efficiency.

[0022] The heat exchange circulation path of the heat exchange module 2 designed in this application is the same as the main heat exchange circulation path of the heat exchange module 1, which reduces the heat exchange complexity of the heat exchange module 2. The main primary side circulation path designed in this application is: module 2 primary side flow inlet → module 2 primary side pipe system → intermediate interconnecting box → module 1 primary side pipe system → primary side fluid outlet.

[0023] In addition, the manufacturing method of the coupled high-temperature and low-pressure heat exchanger provided in this application adopts additive manufacturing technology, which can realize more special-shaped structural designs of the heat exchanger, and can maximize the formation of a wider primary side fluid inlet, making the external environment flow field of the heat exchanger more uniform. The integrated 3D printing molding method reduces the traditional heat exchanger equipment component assembly process, and can realize processing and manufacturing near the factory, which has great advantages in the overall equipment supply cycle such as equipment manufacturing and transportation.

[0024] The present application adopts coupled manufacturing, which reduces the volume occupied by the equipment and further reduces the space requirement for equipment layout, thereby reducing the overall project cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solution of the present application, the following is a brief introduction to the drawings required for the technical description.

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

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

[0028] Figure 3 A schematic diagram of the secondary side fluid flow direction of module 1 provided in an embodiment of the present application;

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

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

[0031] Figure 6 for Figure 1 A top view of the portion below the upper header tank of the heat exchange module 2 along direction A;

[0032] Figure 7 for Figure 6 A cross-sectional view of the heat exchange module 2 along the direction B;

[0033] Figure 8 for Figure 6 A cross-sectional view of the heat exchange module 2 along the C direction;

[0034] Fig. 9 for Figure 6 A cross-sectional view of the heat exchange module 2 along the D direction;

[0035] Fig.10 for Figure 1 A top view of the heat exchange module 1 along the E direction;

[0036] Fig.11 for Fig.10 A cross-sectional view of the heat exchange module 1 along the F direction;

[0037] Fig.12 for Fig.10 A cross-sectional view of the heat exchange module 1 along the G direction;

[0038] Fig.13 for Fig.10 A cross-sectional view of heat exchange module 1 along direction H in FIG.

[0039] Description of reference numerals:

[0040] 1. Heat exchange module one; 2. Heat exchange module two; 3. Upper header box of module two; 4. Lower header box of module two; 5. Secondary pipe system of module two; 6. Primary pipe system of module two; 7. Intermediate connecting box; 8. Secondary inlet pipe of module one; 9. Secondary outlet pipe of module one; 10. Upper header box of module one; 11. Lower header box of module one; 12. Secondary pipe system of module one; 13. Primary pipe system of module one; 14. Secondary inlet pipe of module two; 15. Secondary outlet pipe of module two; 16. Secondary outlet of module two; 17. Secondary inlet of module two; 18. Secondary outlet of module one; 19. Secondary inlet of module one; 20. Primary fluid outlet; 21. Primary through-flow channel of module two; 22. Connecting plate. DETAILED DESCRIPTION

[0041] The following is further explained in detail through specific implementation methods.

[0042] like Figures 1 to 13 As shown, the embodiment of the present application provides a coupled high-temperature and low-pressure heat exchanger, including a heat exchange module 1 and a heat exchange module 2, and adopts additive manufacturing technology to realize a high-temperature and low-pressure heat exchanger with dual heat exchangers coupled. The heat exchange module 1 and the heat exchange module 2 are an integrated structure, and a connecting plate 22 is designed for connection.

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

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

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

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

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

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

[0055] Heat exchange module 1 and heat exchange module 2 are manufactured by additive manufacturing (3D printing), and are directly printed upward in the radial direction, and the primary and secondary pipe systems in the module are also integrally formed by 3D printing. In this embodiment, there are only two secondary inlet pipes and outlet pipes of the heat exchange modules (i.e., module 1 secondary inlet pipe 8, module 1 secondary outlet pipe 9, module 2 secondary inlet pipe 14, module 2 secondary outlet pipe 15), and the secondary inlet pipe and outlet pipe are in an assembly relationship with the heat exchange module. The secondary inlet pipe and outlet pipe are manufactured separately, and then installed on the heat exchange module. They are inserted from top to bottom during assembly. The bottom of the inlet pipe and the lower collector box, the bottom of the outlet pipe and the upper collector box use labyrinth sealing components to achieve interference sealing. The bottom of the outlet pipe and the upper collector box of the heat exchange module 2 2 can be welded and sealed.

[0056] The upper half of the coupled high-temperature, low-pressure heat exchanger provided in this embodiment is the heat exchange module 2 2. A secondary side header box is provided at the top and bottom of the heat exchange module 2, namely, the upper header box 3 of the module 2 located at the top and the lower header box 4 of the module 2 located at the bottom. The lower header box 4 of the module 2 is used to distribute the secondary side fluid entering the heat exchange module 2 2 into the heat exchange channel (the secondary side pipe system 5 of the module 2); the upper header box 3 of the module 2 is used to complete the secondary side fluid converging and flowing out of the heat exchange module 2 2. A through-flow channel for the primary side fluid (the primary side through-flow channel 21 of the module 2) is provided inside the heat exchange module 2 near the upper header box 3 of the module 2, and the primary fluid enters from the side inlet window ( Figure 5In the example, the inlet of the primary side through-flow channel 21 of module two) enters the through-flow channel (the primary side through-flow channel 21 of module two), enters the primary side pipe system 6 of module two after free distribution, and then enters the primary side pipe system 13 of module one after confluence and free distribution through the lower intermediate connecting box 7.

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

[0058] like Figures 6 to 9 As shown, the heat exchange module 2 is provided with a module 2 secondary side pipe system 5 and a module 2 primary side pipe system 6 inside, and the module 2 secondary side pipe system 5 and the module 2 primary side pipe system 6 are arranged alternately, as shown in FIG. Figure 6 , the solid coil (module two secondary side pipe system 5) represents the secondary side flow channel, and the dotted coil (module two primary side pipe system 6) represents the primary side flow channel, and the two are arranged in parallel; the shape of the primary side flow channel and the secondary side flow channel is not necessarily a circular channel, but can also be a square, which is specifically determined by comprehensive design and calculation based on various factors such as the actual flow channel and flow resistance. The circular diagram in this embodiment is only an example. The fluid in the module two secondary side pipe system 5 and the module two primary side pipe system 6 flows in reverse directions, the module two secondary side pipe system 5 flows from bottom to top, and the module two primary side pipe system 6 flows from top to bottom. The module two primary side through-flow channel 21 is connected to the module two primary side pipe system 6.

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

[0060] Secondary side: The secondary side fluid enters the secondary side inlet pipe 14 of module 2 from the inlet (module 2 secondary side inlet 17), enters the module 2 lower header box 4 of the heat exchange module 2, enters the module 2 secondary side pipe system 5 after distribution, flows from bottom to top into the module 2 upper header box 3 of the heat exchange module 2 2, and flows out of the coupled high temperature and low pressure heat exchanger through the module 2 secondary side outlet pipe 15 after confluence. 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 2 through the through-flow channel (module 2 primary side through-flow channel 21), and after being distributed, the fluid enters the module 2 primary side pipe system 6 of the heat exchange module 2 2 from top to bottom, and enters the intermediate connecting box 7 after countercurrent heat exchange with the secondary side fluid.

[0062] The lower half of the coupled high-temperature low-pressure heat exchanger provided in this embodiment is the heat exchange module 1. The primary side flow area of ​​the heat exchange module 1 is 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 a full-through mode, and the module primary side pipe system 13 is directly connected to the intermediate connecting box 7, which serves as the entrance for the module primary side fluid to enter the heat exchange module 1. The inlet window part is Figure 1 The hollow arrow at the bottom of the middle connecting box 7 indicates the position. The hollow arrow above the middle connecting box 7 is a schematic diagram of the route of part of the primary side fluid entering the middle connecting box from the external flow field.

[0063] The heat exchange module 1 is provided with a secondary side header box at the top and bottom, namely, the upper header box 10 of the module 1 located at the top and the lower header box 11 of the module located at the bottom. The function of the lower header box 11 of the module is to diffuse the cold fluid entering the heat exchanger module 1 from the external system, so that it can be freely distributed and enter the secondary side pipe system. The function of the upper header box 10 of the module 1 is to converge the heated secondary side fluid in the secondary side pipe system of the module 1, so that it can be concentrated and flow out from the secondary side outlet pipe 9 of the module 1.

[0064] like Figures 10 to 13 As shown, a module-secondary side pipe system 12 and a module-primary side pipe system 13 are arranged inside the heat exchange module-1, and the module-secondary side pipe system 12 and the module-primary side pipe system 13 are arranged alternately. Fig.10 , the solid coil (module one primary side pipe system 13) represents the primary side flow channel, and the dotted coil (module one secondary side pipe system 12) represents the secondary side flow channel, and the two are arranged in parallel; the shape of the primary side flow channel and the secondary side flow channel is not necessarily a circular channel, but can also be a square channel, which is specifically determined by comprehensive design and calculation based on various factors such as the actual flow channel and flow resistance. The circular diagram in this embodiment is only an example. The fluid in the module one secondary side pipe system 12 and the module one primary side pipe system 13 flows in reverse directions, the module one secondary side pipe system 12 flows from bottom to top, and the module one primary side pipe system 13 flows from top to bottom.

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

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

[0067] Primary side: The primary side fluid of the heat exchange module 1 is composed of two parts that converge in the intermediate connecting box 7. One part is the primary side fluid that has completed heat exchange in the heat exchange module 2 2, and the other part is the external fluid that directly enters the intermediate connecting box 7 from the gap between the heat exchange module 1 and the heat exchange module 2 2; after confluence and distribution, it enters the primary side pipe system 13 of the module 1 of the 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 heat exchange module 2 to allow the pipe of the heat exchange module 1 to pass through. A certain gap is left between the two heat exchange modules so that the heat exchange module 2 2 can freely expand thermally. The shell of the heat exchange module 1 extends upward beyond the lower part of the heat exchange module 2 2 so that the primary side fluid enters the heat exchange module 1 1.

[0069] like Figure 1 As shown, the primary fluid outlet 20 is discharged to the air, and the four inlets and outlets, namely, the module two secondary side outlet 16, the module two secondary side inlet 17, the module one secondary side outlet 18, and the module one secondary side inlet 19, represent the corresponding system pipeline interfaces.

[0070] In addition, an embodiment of the present application also provides a method for manufacturing a coupled high-temperature, low-pressure heat exchanger, which uses additive manufacturing technology to reduce the multiple heat exchangers required for existing projects to heat exchange modules, and design them to be coupled into a heat exchanger device. The device has the equipment functions of multi-circuit heat exchange, while reducing the volume of the heat exchanger, effectively reducing the engineering application layout space, and can significantly reduce project investment and improve project economy.

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

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

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

[0074] In this embodiment, the manufacturing method is to manufacture a heat exchanger suitable for high temperature and low pressure environment in a targeted manner. It is necessary to overcome the manufacturing constraints, which mainly include two aspects: one is that there is no experience in using metal powder raw materials corresponding to special metal materials and the corresponding metal materials using additive manufacturing technology; on the other hand, there is no experience in printing engineering projects for ultra-large equipment components with a diameter exceeding 8m, and it is impossible to complete printing and manufacturing with a single device.

[0075] Regarding the first factor, this embodiment adopts the additive manufacturing technology model engineering application of titanium alloy / super titanium alloy materials, and the metal powder material and printing technology can be further improved according to the material performance requirements.

[0076] The second factor can be achieved by setting up multiple devices to print and manufacture simultaneously.

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

[0079] 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. Any changes or substitutions that can be easily conceived by any technician familiar with the technical field within the technical scope disclosed in the present application should be covered within the protection scope of the present application.

Claims

1. A coupled high-temperature and low-pressure heat exchanger, characterized in that: The invention comprises an integrally formed heat exchange module 1 (1) and a heat exchange module 2 (2), wherein the heat exchange module 2 (2) is arranged above the heat exchange module 1 (1), an intermediate connecting box (7) is arranged between the heat exchange module 1 (1) and the heat exchange module 2 (2), a module 1 secondary side inlet pipe (8) and a module 1 secondary side outlet pipe (9) are inserted into the heat exchange module 1 (1), and a module 2 secondary side inlet pipe (14) and a module 2 secondary side outlet pipe (15) are inserted into the heat exchange module 2 (2); The heat exchange module 1 (1) is provided with a module 1 upper header box (10) at the top and a module 1 lower header box (11) at the bottom, and is provided with a module 1 secondary side pipe system (12) and a module 1 primary side pipe system (13) inside, wherein the fluids in the module 1 secondary side pipe system (12) and the module 1 primary side pipe system (13) flow in opposite directions; The heat exchange module 2 (2) is provided with a module 2 upper header box (3) at the top and a module 2 lower header box (4) at the bottom. The module 2 secondary pipe system (5), the module 2 primary pipe system (6) and the module 2 primary through-flow channel (21) are provided inside. The fluids in the module 2 secondary pipe system (5) and the module 2 primary pipe system (6) flow in opposite directions. The module 2 primary through-flow channel (21) is connected to the module 2 primary pipe system (6).

2. The coupled high-temperature low-pressure heat exchanger according to claim 1, characterized in that: The number of the heat exchange modules 2 (2) is 2, which are symmetrically arranged on both sides of the primary and secondary side inlet pipes (8) of the module.

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

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

5. The coupled high-temperature low-pressure heat exchanger according to claim 1, characterized in that: The module-secondary side pipe system (12) is connected to the module-upper current collecting box (10) and the module-lower current collecting box (11); the module-primary side pipe system (13) is connected to the intermediate connecting box (7) and is connected to the primary side fluid outlet (20).

6. The coupled high-temperature low-pressure heat exchanger according to claim 1, characterized in that: The module two secondary side pipe system (5) is connected to the module two upper current collecting box (3) and the module two lower current collecting box (4); the module two primary side pipe system (6) is connected to the module one upper current collecting box (10) and the module two lower current collecting box (4).

7. The coupled high-temperature low-pressure heat exchanger according to claim 1, characterized in that: The module-secondary side inlet pipe (8) is connected to a lower current collecting box (11) of the module, and the module-secondary side outlet pipe (9) is connected to an upper current collecting box (10) of the module.

8. The coupled high-temperature low-pressure heat exchanger according to claim 1, characterized in that: The module two secondary side inlet pipe (14) is connected to the module two lower current collecting box (4), and the module two secondary side outlet pipe (15) is connected to the module two upper current collecting box (3).

9. The coupled high-temperature 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 via a connecting plate (22), and the connecting plate (22) is a hollow connecting plate.

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

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