Silicon carbide shell-and-tube heat exchanger sealing structure and mounting method

Abstract

The invention relates to a silicon carbide shell-and-tube heat exchanger sealing structure and an installation method, and relates to the technical field of heat exchanger sealing structures. The heat exchanger comprises a shell and a heat exchange tube arranged in the shell in a penetrating mode, a plurality of sets of tube plates are arranged at the end of the shell, each tube plate is arranged on the heat exchange tube in a sleeving mode, and mounting ring grooves are formed in the mutually-attached side walls of the adjacent tube plates and surround the heat exchange tube. Sealing rings tightly attached to the heat exchange pipes are jointly arranged in the adjacent mounting ring grooves. The mounting structure has the effects of conveniently mounting the gasket, the heat exchange tube and the tube plate and improving the mounting efficiency of the heat exchanger.

Description

Technical Field

[0001] The present application relates to the technical field of heat exchanger sealing structures, and in particular to a silicon carbide tube-in-tube heat exchanger sealing structure and an installation method. Background Art

[0002] Shell and tube heat exchanger, also known as shell and tube heat exchanger, is the most typical partition wall heat exchanger with a long history and dominant role. It is mainly composed of shell, heat exchange tube, tube sheet, baffle and head. In recent years, with the rapid promotion of silicon carbide heat exchanger, silicon carbide shell and tube heat exchanger has been widely used in fine chemical, biomedicine, metallurgical pickling, fluorine chemical and other industries.

[0003] In the related art, a silicon carbide shell-and-tube heat exchanger usually has several groups of mounting grooves opened on the inner wall of the hole of the tube sheet, and then gaskets are placed inside the mounting grooves, so that when the heat exchange tubes are inserted into the holes of the tube sheet, the gaskets are tightly sleeved on the heat exchange tubes to achieve sealing between the heat exchange tubes and the tube sheet.

[0004] With respect to the above-mentioned related technologies, the inventors found that: in order to ensure the tightness between the gasket and the heat exchange tube, the heat exchange tube and the gasket need to have an interference fit. Therefore, in the process of the heat exchange tube passing through the gasket, it is very easy to touch the gasket and detach from the tube sheet. The gasket is pre-embedded in the hole of the tube sheet, and it is inconvenient for the installer to touch the gasket for adjustment, which greatly affects the installation efficiency, so it needs to be improved. Summary of the invention

[0005] In order to improve the problem that embedded gaskets are easy to fall off and affect installation efficiency, the present application provides a silicon carbide shell and tube heat exchanger sealing structure and installation method.

[0006] In the first aspect, the present application provides a silicon carbide shell-and-tube heat exchanger sealing structure, which adopts the following technical solution: A sealing structure of a silicon carbide shell-and-tube heat exchanger comprises a shell and heat exchange tubes passing through the shell, a plurality of groups of tube sheets are arranged at the end of the shell, and each of the tube sheets is sleeved on the heat exchange tubes, and the side walls of adjacent tube sheets that are in contact with each other are provided with mounting ring grooves around the heat exchange tubes, and the adjacent mounting ring grooves are commonly provided with sealing rings that are tightly fitted to the heat exchange tubes.

[0007] By adopting the above technical scheme, the traditional integral tube sheet is divided into several groups of tube sheets, and after the heat exchange tube is installed, the sealing ring and the tube sheet are repeatedly sleeved on the heat exchange tube in sequence, and the sealing ring is squeezed by using the installation ring groove between adjacent tube sheets, so that the sealing ring is stably fitted between the heat exchange tube and the tube sheet, thereby realizing the rapid installation of the overall sealing structure and improving the installation efficiency; at the same time, it replaces the traditional need to open a ring groove on the inner wall of the tube sheet aperture and install the sealing ring, thereby simplifying the overall production processing difficulty.

[0008] Preferably, the bottom wall of each of the mounting ring grooves is provided with an outwardly expanding ring groove, and the side walls on both sides in the width direction of each of the sealing rings are provided with outwardly expanding rings for resisting against the outwardly expanding ring groove.

[0009] By adopting the above technical solution, when the adjacent tube sheets are closed and the outer expansion ring is received by the outer expansion ring groove, the side wall of the outer expansion ring can be abutted against the inner wall of the outer expansion ring groove, thereby increasing the difficulty of the sealing ring being separated from the installation ring groove and improving the stability of the connection between the sealing ring and the tube sheet.

[0010] Preferably, the side walls of adjacent tube sheets facing each other are provided with airtight ring grooves, and airtight rings tightly fitting the adjacent tube sheets are arranged inside the adjacent airtight ring grooves, and all the sealing rings are located on the inner side of the airtight rings.

[0011] By adopting the above technical solution, when adjacent tube sheets are closed, the sealing ring seals the gap between the heat exchange tube and the tube sheet, and the airtight ring seals the space between the adjacent tube sheets. At this time, a trace amount of gas remains between the adjacent tube sheets and squeezes the outer peripheral wall of the sealing ring, so that each group of sealing rings fits the corresponding heat exchange tube more closely, thereby improving the tightness of the connection between the sealing ring and the heat exchange tube.

[0012] Second, The present application provides a method for installing a sealing structure of a silicon carbide shell-and-tube heat exchanger, comprising the following steps: Install the heat exchange tubes: fix the tube sheet to the end of the shell, pass the heat exchange tubes through the tube sheet, and insert them into the shell; Install the sealing ring: put the sealing ring on each group of heat exchange tubes, and put the tube sheet on the heat exchange tubes. The adjacent tube sheets squeeze and fix the sealing ring on the heat exchange tubes; Repeat the operation: Repeat the steps of installing the sealing ring several times, so that each group of heat exchange tubes is sleeved with several groups of sealing rings.

[0013] Preferably, in the step of installing the heat exchange tubes, the heat exchange tubes are installed by a driving mechanism, and the driving mechanism includes a workbench for placing the shell and a transfer table arranged on the workbench, a driving unit, a moving component, a lifting component, and a driving component; the transfer table is arranged at the end of the shell, and the top wall of the transfer table is provided with a plurality of groups of placement grooves for storing the heat exchange tubes, and all of the placement grooves are spaced apart along the width direction of the transfer table; the moving component is used to drive the transfer table to move along the width direction of the workbench, and the lifting component is used to drive the transfer table to move up and down, the driving unit is located on the side of the transfer table away from the shell, and the side wall of the shell facing the driving unit can be against the end of the heat exchange tube; the driving component is used to drive the driving unit to approach or move away from the shell.

[0014] By adopting the above technical scheme, the transfer table supports the heat exchange tube to be installed, and the lifting assembly and the moving assembly adjust the position of the transfer table to adjust the relative position of the heat exchange tube to be installed on the transfer table and the shell, so that the heat exchange tube is aligned with the installation position of the shell; the driving assembly is used to drive the driving part to push the heat exchange tube to quickly insert the heat exchange tube into the shell, thereby realizing rapid and stable installation of the heat exchange tube, reducing labor loss in manual installation, and improving the installation efficiency of the heat exchange tube.

[0015] Preferably, the moving assembly includes a mounting table, a moving screw, a moving block and a moving motor; the mounting table is arranged at the bottom of the turntable, the moving screw is rotatably arranged on the mounting table, and the length direction of the moving screw is parallel to the width direction of the workbench; the moving block is slidably arranged on the mounting table, and the moving block is connected to the turntable; the moving screw passes through the moving block, and the moving screw is threadedly connected to the moving block; the moving motor is arranged on the mounting table to drive the moving screw to rotate.

[0016] By adopting the above technical solution, the output end of the moving motor drives the moving screw to rotate, and the rotating moving screw drives the moving block, so that the moving block drives the transfer table to move on the installation table to adjust the relative position of the heat exchange tube to be installed on the transfer table and the shell.

[0017] Preferably, the lifting assembly includes a mounting plate, a lifting screw, a sliding block, a support rod and a driving member; the mounting plate is arranged on a workbench, the lifting screw is rotatably arranged on the mounting plate, the sliding block is threadedly connected to both ends of the lifting screw in the length direction, and the threads at both ends of the lifting screw are opposite; the support rod is rotatably arranged between each group of sliding blocks and the mounting table; the driving member is arranged on the mounting plate to drive the lifting screw to rotate.

[0018] By adopting the above technical solution, the driving member drives the lifting screw to rotate, and the rotating lifting screw drives the sliding block, so that the sliding block moves toward each other along the length direction of the lifting screw, and the support rod drives the mounting table to drive the mounting table to move up and down. By moving the mounting plate, the mounting table, the transfer table and other components on the mounting plate can be quickly transferred, so that the tube plate and the sealing ring can be installed using the driving plate.

[0019] Preferably, the driving assembly includes a driving screw, a driving guide rod, a sliding table and a driving motor; the driving screw is rotatably arranged on the workbench, the driving guide rod is arranged on the workbench, and the length directions of the driving screw and the driving guide rod are parallel to the axial direction of the shell; the sliding table is slidably arranged on the workbench, and the driving part is connected to the sliding table; the driving screw and the driving guide rod both pass through the sliding table, and the driving screw is threadedly connected to the sliding table; the driving motor is arranged on the workbench to drive the driving screw to rotate.

[0020] By adopting the above technical solution, the output end of the driving motor drives the driving screw to rotate forward and reverse, the rotating driving screw applies force to the sliding table, and the driving guide rod limits the moving direction of the sliding table, so that the sliding table drives the driving part to approach or move away from the shell, thereby driving the driving part to push the heat exchange tube quickly into the shell.

[0021] Preferably, the driving part includes a positioning ring plate, a driving plate and a suction cup group; the positioning ring plate is arranged on a sliding table, and the positioning ring plate is provided with a positioning ring groove coaxially arranged with the shell on the side wall facing the shell, and the driving plate is arranged inside the positioning ring groove to drive the heat exchange tube; the suction cup group is arranged on the positioning ring plate to adsorb the driving plate.

[0022] By adopting the above technical solution, the suction cup group can quickly fix the driving plate inside the positioning ring groove to achieve the connection between the driving plate and the positioning ring plate, so that the driving plate can be used to push the heat exchange tube toward the shell, thereby achieving rapid installation of the heat exchange tube; When the heat exchange tubes are installed and the tube sheet needs to be installed, the installation plate and the components on its surface can be moved away from the workbench, the drive plate can be taken out from the inside of the positioning ring groove, and the tube sheet can be adsorbed inside the positioning ring groove. The driving screw can be used to drive the sliding table to quickly sleeve the tube sheet onto the heat exchange tube, thereby reducing the labor loss of manual installation of the tube sheet.

[0023] Preferably, a driving shell for resisting a sealing ring is arranged inside the positioning ring groove, and a plurality of groups of through holes for the heat exchange tubes to pass through are opened on the driving shell. A blowing member is arranged on the driving shell, and the output end of the blowing member is connected to the inside of the driving shell, and a gap for air flow to pass through is reserved between the inner peripheral wall of the through hole and the outer peripheral wall of the heat exchange tube.

[0024] By adopting the above technical solution, when the sealing rings are all sleeved on the ends of the heat exchange tubes, the sliding driving shell can be driven to sleeve all the heat exchange tubes, and the driving shell is pressed against the sealing rings toward the side wall of the shell, which can push each group of sealing rings to move quickly along the length direction of the heat exchange tubes; and the airflow output by the blowing member is discharged through the gap between the through hole and the heat exchange tube to generate an airflow driving force for the sealing ring to move, thereby driving the sealing ring to move quickly to the inside of the installation ring groove on the tube plate, thereby realizing the rapid installation of the sealing ring and the heat exchange tube.

[0025] In summary, the present application includes at least one of the following beneficial technical effects: 1. By dividing the traditional integral tube sheet into several groups of tube sheets, and after the heat exchange tube is installed, the sealing ring and the tube sheet are repeatedly sleeved on the heat exchange tube in sequence, and the sealing ring is squeezed by the installation ring groove between adjacent tube sheets, so that the sealing ring is stably fitted between the heat exchange tube and the tube sheet, the rapid installation of the overall sealing structure is achieved, and the installation efficiency of the heat exchanger sealing structure is improved; 2. The position of the transfer table is adjusted by setting a lifting component and a moving component to adjust the relative position of the heat exchange tube to be installed on the transfer table and the shell. The driving component is used to drive the driving part to push the heat exchange tube to quickly insert the heat exchange tube into the shell, thereby realizing a fast and stable installation of the heat exchange tube, reducing the labor loss of manual installation, and improving the installation efficiency of the heat exchange tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of a silicon carbide shell-and-tube heat exchanger sealing structure and installation method according to an embodiment of the present application.

[0027] Figure 2 It is used to reflect Figure 1 A magnified schematic diagram of the structure in the middle.

[0028] Figure 3 It is a structural diagram used to reflect the connection relationship between the driving mechanism, heat exchange tubes and shell.

[0029] Figure 4 It is a cross-sectional diagram used to illustrate the connection relationship between the transfer table, the moving assembly and the lifting assembly.

[0030] Figure 5 It is an exploded view used to show the structure of the drive unit.

[0031] Figure 6 It is an exploded schematic diagram used to illustrate the connection relationship between the positioning ring plate and the tube plate.

[0032] Figure 7 It is an exploded schematic diagram used to illustrate the connection relationship between the drive sleeve and the positioning ring plate.

[0033] Description of reference numerals: 1. Shell; 11. Heat exchange tube; 2. Tube sheet; 21. Mounting ring groove; 211. Outward expansion ring groove; 22. Sealing ring; 221. Outward expansion ring; 23. Airtight ring groove; 231. Airtight ring; 3. Workbench; 31. Transfer table; 311. Placement groove; 4. Drive unit; 41. Positioning ring plate; 411. Positioning ring groove; 42. Drive plate; 43. Suction cup group; 5. Moving assembly; 51. Mounting table; 52. Moving screw; 53. Moving block; 54. Moving motor; 6. Lifting assembly; 61. Mounting plate; 62. Lifting screw; 63. Sliding block; 64. Support rod; 65. Driving member; 7. Driving assembly; 71. Driving screw; 72. Driving guide rod; 73. Sliding table; 74. Driving motor; 8. Driving shell; 81. Pass hole; 82. Blowing member. DETAILED DESCRIPTION

[0034] The following is combined with Figure 1-7 This application is described in further detail.

[0035] The embodiment of the present application discloses a sealing structure and an installation method for a silicon carbide shell-and-tube heat exchanger, which are used to improve the problem that the embedded gasket is easy to fall off and affects the installation efficiency.

[0036] Reference Figure 1 and Figure 2 A sealing structure of a silicon carbide tube-in-tube heat exchanger includes a shell 1 and a plurality of groups of heat exchange tubes 11 inserted into the shell 1. Specifically, the heat exchange tubes 11 can be made of silicon carbide. The end of the shell 1 is sleeved with a plurality of groups of tube sheets 2 on all the heat exchange tubes 11. The side walls of adjacent tube sheets 2 that are in contact with each other are provided with mounting ring grooves 21. Each group of mounting ring grooves 21 is provided around the heat exchange tube 11. The interiors of the mounting ring grooves 21 of adjacent tube sheets 2 are filled with sealing rings 22 for sleeved heat exchange tubes 11. The sealing rings 22 are in close contact with the heat exchange tubes 11.

[0037] Reference Figure 1 and Figure 2 The bottom wall of each set of mounting ring grooves 21 is provided with an outwardly expanding ring groove 211 around the circumference of the corresponding sealing ring 22, and both sides of the width direction of each set of sealing rings 22 are integrally formed with an outwardly expanding ring ring 221, and the outwardly expanding ring ring 221 is adapted to the outwardly expanding ring groove 211.

[0038] Reference Figure 1 and Figure 2 The side walls of adjacent tube sheets 2 facing each other are provided with airtight ring grooves 23, and the airtight ring grooves 23 are extended along the circumference of the tube sheets 2. The airtight ring grooves 23 of adjacent tube sheets 2 are filled with airtight rings 231, which are tightly fitted with the inner side walls of the airtight ring grooves 23, and all the sealing rings 22 are located on the inner side of the airtight rings 231.

[0039] The implementation principle of a sealing structure of a silicon carbide tube heat exchanger in the embodiment of the present application is: First, a group of tube sheets 2 are fixed to the end of the shell 1, and then the heat exchange tubes 11 are inserted into the tube sheets 2. After the heat exchange tubes 11 are installed, the sealing rings 22 and the tube sheets 2 are successively sleeved on the heat exchange tubes 11, so that the sealing rings 22 and the heat exchange tubes 11 are quickly connected, and the sealing rings 22 are squeezed and positioned through the installation ring grooves 21 between the adjacent tube sheets 2, so that the sealing rings 22 are reduced from falling off.

[0040] The present application also discloses a method for installing a sealing structure of a silicon carbide tube-in-tube heat exchanger, comprising the following steps: Install the heat exchange tube 11: fix the tube sheet 2 to the end of the shell 1, and pass the heat exchange tube 11 through the tube sheet 2 and insert it into the shell 1; Install the sealing ring 22: sleeve the sealing ring 22 on each group of heat exchange tubes 11, and sleeve the tube sheet 2 on the heat exchange tubes 11, and squeeze the sealing ring 22 on the adjacent tube sheet 2 to fix it on the heat exchange tubes 11; Repeat the operation: Repeat the steps of installing the sealing rings 22 several times, so that each group of heat exchange tubes 11 is sleeved with several groups of sealing rings 22 .

[0041] Reference Figure 3 and Figure 4 In this embodiment, in the above-mentioned step of installing the heat exchange tube 11, the heat exchange tube 11 is installed by a driving mechanism, and the driving mechanism includes a workbench 3 for placing the shell 1 and a transfer table 31 arranged on the workbench 3, a driving part 4, a moving component 5, a lifting component 6, and a driving component 7.

[0042] Reference Figure 3 and Figure 4 The transfer table 31 is located on the workbench 3 at the end of the shell 1, and a plurality of placement grooves 311 are provided on the upper surface of the transfer table 31. The placement grooves 311 are adapted to the heat exchange tubes 11 so as to stably place the heat exchange tubes 11 on the transfer table 31. The length directions of all the placement grooves 311 are parallel to the axial direction of the shell 1, and all the placement grooves 311 are spaced apart along the width direction of the transfer table 31.

[0043] Reference Figure 3 and Figure 4 The moving assembly 5 includes a mounting table 51, a moving screw 52, ​​a moving block 53 and a moving motor 54; the mounting table 51 is located on the side wall of the turntable 31 facing the workbench 3, the moving block 53 is fixedly connected to the side wall of the turntable 31 facing the mounting table 51, and the moving block 53 is slidably connected to the mounting table 51.

[0044] Reference Figure 3 and Figure 4The moving screw 52 is rotatably connected to the mounting platform 51, and the length direction of the moving screw 52 is parallel to the width direction of the transfer platform 31. The moving screw 52 passes through the moving block 53, and the moving screw 52 is threadedly connected to the moving block 53. The moving motor 54 is fixedly connected to the mounting platform 51, and the output end of the moving motor 54 is drivingly connected to the end of the moving screw 52 to drive the moving screw 52 to rotate, thereby driving the moving block 53 to drive the transfer platform 31 and the heat exchange tube 11 to move.

[0045] Reference Figure 3 and Figure 4 The lifting assembly 6 includes a mounting plate 61, a lifting screw 62, a sliding block 63, a support rod 64 and a driving member 65; the mounting plate 61 is fixedly connected to the workbench 3 by bolts, and the lifting screw 62 is rotatably connected to the mounting plate 61. The lifting screw 62 is located on both sides of the width direction of the mounting platform 51, and the length directions of the two sets of lifting screws 62 are parallel to each other.

[0046] Reference Figure 3 and Figure 4 In this embodiment, the threads at both ends of the lifting screw 62 are opposite, the sliding block 63 is threadedly connected to both ends of each set of lifting screws 62, and the sliding block 63 is slidably connected to the mounting plate 61. The support rod 64 is rotatably connected to each set of sliding blocks 63, and the end of each set of support rods 64 away from the sliding block 63 is rotatably connected to the bottom of the mounting platform 51, so that the support rod 64 supports the mounting platform 51 and the transfer platform 31. In this embodiment, the driving member 65 can be a motor-driven worm gear structure to drive the two sets of lifting screws 62 to rotate synchronously, thereby driving the sliding blocks 63 on the two sets of lifting screws 62 to move synchronously.

[0047] Reference Figure 3 and Figure 4 The driving part 4 is located on the side of the turntable 31 away from the housing 1, and the driving assembly 7 is used to drive the driving part 4 to approach or move away from the housing 1. The driving assembly 7 includes a driving screw 71, a driving guide rod 72, a sliding table 73 and a driving motor 74; the driving screw 71 is rotatably connected to the workbench 3, the driving guide rod 72 is fixedly connected to the workbench 3, and the length directions of the driving screw 71 and the driving guide rod 72 are parallel to the axial direction of the housing 1.

[0048] Reference Figure 3 and Figure 4 The sliding table 73 is sleeved on the driving screw 71 and the driving guide rod 72, and the driving screw 71 is threadedly connected to the sliding table 73. The driving motor 74 is installed on the workbench 3, and the output end of the driving motor 74 is drivingly connected to the end of the driving screw 71 to drive the driving screw 71 to rotate.

[0049] Reference Figure 4 and Figure 5The driving part 4 includes a positioning ring plate 41, a driving plate 42 and a suction cup group 43; the positioning ring plate 41 is mounted on the top wall of the sliding table 73, and a positioning ring groove 411 is provided on the side wall of the positioning ring plate 41 facing the shell 1, and the axial direction of the positioning ring groove 411 is coaxial with the shell 1. The suction cup group 43 is installed inside the positioning ring groove 411 along the circumference of the positioning ring plate 41. In this embodiment, the suction cup group 43 can be a vacuum suction cup. The driving plate 42 is placed inside the positioning ring groove 411 and is fixed by adsorption through the suction cup group 43, and the driving plate 42 can be against the end of the heat exchange tube 11 away from the shell 1.

[0050] Reference Figure 5 and Figure 6 When the lifting assembly 6 and the transfer table 31 on the mounting plate 61 are removed, and the heat exchange tubes 11 are inserted into the shell 1, and the tube sheet 2 and the sealing ring 22 need to be sleeved, the driving plate 42 can be taken out from the inside of the positioning ring groove 411. In this embodiment, the driving plate 42 has the same diameter as the tube sheet 2. The tube sheet 2 can be placed inside the positioning ring groove 411, and the tube sheet 2 can be quickly sleeved on all the heat exchange tubes 11 by moving the sliding table 73, so that the tube sheet 2 can be quickly and stably installed.

[0051] Reference Figure 5 and Figure 7 In addition, when the drive plate 42 is taken out from the interior of the positioning ring groove 411, a drive shell 8 for contacting the sealing ring 22 is installed inside the positioning ring groove 411. In this embodiment, the drive shell 8 is a hollow cylinder. The drive shell 8 is provided with a plurality of groups of through holes 81 along the thickness direction for the heat exchange tube 11 to pass through, and a gap for air flow to pass through is reserved between the inner peripheral wall of each group of through holes 81 and the outer peripheral wall of the corresponding heat exchange tube 11. A blower 82 is installed on the peripheral wall of the drive shell 8. In this embodiment, the blower 82 can be a blower, and the output end of the blower 82 is connected to the interior of the drive shell 8.

[0052] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A silicon carbide tube-in-tube heat exchanger sealing structure, comprising a shell (1) and a heat exchange tube (11) passing through the shell (1), characterized in that: A plurality of groups of tube sheets (2) are arranged at the end of the shell (1), and each of the tube sheets (2) is sleeved on the heat exchange tube (11). The side walls of adjacent tube sheets (2) that are in contact with each other are provided with mounting ring grooves (21) around the heat exchange tube (11), and the adjacent mounting ring grooves (21) are provided with sealing rings (22) that are in close contact with the heat exchange tube (11).

2. The sealing structure of a silicon carbide shell-and-tube heat exchanger according to claim 1, characterized in that: The bottom wall of each mounting ring groove (21) is provided with an outwardly expanded ring groove (211), and the side walls on both sides in the width direction of each sealing ring (22) are provided with outwardly expanded rings (221) for abutting against the outwardly expanded ring groove (211).

3. The sealing structure of a silicon carbide tube heat exchanger according to claim 2, characterized in that: The mutually facing side walls of the adjacent tube sheets (2) are provided with airtight ring grooves (23), and the adjacent airtight ring grooves (23) are provided with airtight rings (231) that are tightly fitted to the adjacent tube sheets (2), and all the sealing rings (22) are located on the inner side of the airtight rings (231).

4. A method for installing a sealing structure of a silicon carbide tube heat exchanger according to any one of claims 1 to 3, characterized in that: The steps include: Installing the heat exchange tube (11): fixing the tube sheet (2) to the end of the shell (1), passing the heat exchange tube (11) through the tube sheet (2), and inserting it into the shell (1); Installing the sealing ring (22): sleeve the sealing ring (22) on each group of heat exchange tubes (11), and sleeve the tube sheet (2) on the heat exchange tube (11), and squeeze the sealing ring (22) on the adjacent tube sheet (2) to fix it on the heat exchange tube (11); Repeating the operation: Repeating the step of installing the sealing ring (22) several times, so that each group of heat exchange tubes (11) is sleeved with several groups of sealing rings (22).

5. The method for installing the sealing structure of the silicon carbide tube-in-tube heat exchanger according to claim 4, characterized in that: In the step of installing the heat exchange tube (11), the heat exchange tube (11) is installed by a driving mechanism, wherein the driving mechanism comprises a workbench (3) for placing the shell (1) and a transfer table (31) arranged on the workbench (3), a driving unit (4), a moving component (5), a lifting component (6), and a driving component (7); the transfer table (31) is arranged at the end of the shell (1), and the top wall of the transfer table (31) is provided with a plurality of groups of placement grooves (311) for storing the heat exchange tube (11), and all the placement grooves (311) are arranged in a plurality of groups. ) are spaced apart along the width direction of the transfer table (31); the moving component (5) is used to drive the transfer table (31) to move along the width direction of the workbench (3); the lifting component (6) is used to drive the transfer table (31) to move up and down; the driving unit (4) is located on a side of the transfer table (31) away from the shell (1), and the side wall of the driving unit (4) facing the shell (1) can abut against the end of the heat exchange tube (11); the driving component (7) is used to drive the driving unit (4) to approach or move away from the shell (1).

6. The method for installing the sealing structure of the silicon carbide tube-in-tube heat exchanger according to claim 5, characterized in that: The moving assembly (5) comprises a mounting platform (51), a moving screw (52), a moving block (53) and a moving motor (54); the mounting platform (51) is arranged at the bottom of the turntable (31), the moving screw (52) is rotatably arranged on the mounting platform (51), and the length direction of the moving screw (52) is parallel to the width direction of the workbench (3); the moving block (53) is slidably arranged on the mounting platform (51), and the moving block (53) is connected to the turntable (31); the moving screw (52) passes through the moving block (53), and the moving screw (52) is threadedly connected to the moving block (53); the moving motor (54) is arranged on the mounting platform (51) to drive the moving screw (52) to rotate.

7. The method for installing the sealing structure of the silicon carbide tube-in-tube heat exchanger according to claim 6, characterized in that: The lifting assembly (6) comprises a mounting plate (61), a lifting screw (62), a sliding block (63), a support rod (64) and a driving member (65); the mounting plate (61) is arranged on the workbench (3); the lifting screw (62) is rotatably arranged on the mounting plate (61); the sliding block (63) is threadedly connected to both ends of the lifting screw (62) in the length direction, and the threads at both ends of the lifting screw (62) are opposite; the support rod (64) is rotatably arranged between each group of sliding blocks (63) and the mounting platform (51); the driving member (65) is arranged on the mounting plate (61) to drive the lifting screw (62) to rotate.

8. The method for installing the sealing structure of the silicon carbide tube-in-tube heat exchanger according to claim 5, characterized in that: The driving assembly (7) comprises a driving screw (71), a driving guide rod (72), a sliding table (73) and a driving motor (74); the driving screw (71) is rotatably arranged on the workbench (3), the driving guide rod (72) is arranged on the workbench (3), and the length directions of the driving screw (71) and the driving guide rod (72) are both parallel to the axial direction of the shell (1); the sliding table (73) is slidably arranged on the workbench (3), and the driving part (4) is connected to the sliding table (73); the driving screw (71) and the driving guide rod (72) both penetrate the sliding table (73), and the driving screw (71) is threadedly connected to the sliding table (73); the driving motor (74) is arranged on the workbench (3) to drive the driving screw (71) to rotate.

9. The method for installing the sealing structure of the silicon carbide tube-in-tube heat exchanger according to claim 8, characterized in that: The driving part (4) comprises a positioning ring plate (41), a driving plate (42) and a suction cup group (43); the positioning ring plate (41) is arranged on a sliding platform (73); the positioning ring plate (41) is provided with a positioning ring groove (411) coaxially arranged with the shell (1) on a side wall facing the shell (1); the driving plate (42) is arranged inside the positioning ring groove (411) for driving the heat exchange tube (11); the suction cup group (43) is arranged on the positioning ring plate (41) for adsorbing the driving plate (42).

10. The method for installing the sealing structure of the silicon carbide tube-in-tube heat exchanger according to claim 9, characterized in that: A driving shell (8) for contacting the sealing ring (22) is arranged inside the positioning ring groove (411), and a plurality of groups of through holes (81) for the heat exchange tube (11) to pass through are formed through the driving shell (8), and a blasting member (82) is arranged on the driving shell (8), and the output end of the blasting member (82) is connected to the inside of the driving shell (8), and a gap for air flow to pass through is reserved between the inner peripheral wall of the through hole (81) and the outer peripheral wall of the heat exchange tube (11).

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