A device and method for on-site deformation correction of heat exchange tubes in an open-frame gasifier.

Abstract

This invention provides a device and method for on-site straightening of deformed heat exchanger tubes in an open-frame gasifier. The device includes heat exchanger plates and a clamping assembly. One end of the clamping assembly is connected to the deformed tube, and the other end is connected to a clamping assembly. The straightening device includes at least three sets of clamping assemblies. One set of clamping assemblies is located outside the area of ​​maximum deformation, and the other two sets are located inside the deformation. The two sets of clamping assemblies located inside the deformation are spaced vertically at a certain distance, the distance depending on the actual condition of the heat exchanger tube. The straightening device and method of this invention employ a non-destructive straightening method, avoiding damage to the heat exchanger tube and the welds between equipment components, thus ensuring the overall reliability of the equipment. The straightening process is performed slowly to avoid damage to the heat exchanger tube due to excessive deformation. A dedicated clamping device is used to support the heat exchanger tube according to its shape, ensuring no damage to the fins, facilitating heat exchanger tube stability during straightening construction, preventing rebound, and improving the straightening effect.

Description

Technical Field

[0001] This invention relates to the technical field of open-frame gasifier heat exchange equipment, specifically to a device and method for on-site deformation correction of open-frame gasifier heat exchange tubes. Background Technology

[0002] Open-rack vaporizers (ORVs) are large-scale, base-load vaporization units that use seawater as a heat source to vaporize LNG. They offer advantages such as low cost, energy efficiency, environmental friendliness, and high reliability, making them a key component of LNG receiving terminals responsible for vaporization and export. The basic heat exchange unit is a specially designed heat exchange tube, typically finned, with 8-10 fins per tube. A heat transfer accelerator is installed inside the tube to improve the heat transfer coefficient. The tube length is typically 5500-6500 mm. A heat exchange plate consists of multiple parallel heat exchange tubes connected to the inlet and outlet pipes, with the ends of the tubes welded to the inlet and outlet pipes. Generally, 4-6 heat exchange plates form a module, and a vaporizer typically consists of 2-4 modules. Seawater overflows from the seawater tank and sprays downwards onto the surface of the plate-shaped tube bundle, while LNG flows upwards within the heat exchange tubes. The seawater acts as a heat source, transferring heat to heat and vaporize the LNG. However, when the seawater distribution on the heat exchange plate surface is uneven, such as foreign matter adhering to the heat exchange plate surface, foreign matter blocking the overflow of the seawater tank, or low local seawater flow, the heat exchange tube will be subjected to uneven stress, resulting in deformation and affecting safe operation.

[0003] The design life of an ORV (Oriented Refrigerant Container) is typically 25 years. During production and operation, a small number of heat exchanger tubes deform, requiring evaluation and repair. Therefore, how to achieve non-destructive reshaping of the heat exchanger plates without dismantling the equipment or damaging the heat exchanger tubes is a pressing problem to be solved in this field. Summary of the Invention

[0004] In view of this, the present invention aims to provide an on-site deformation correction device and method for heat exchange tubes of open-frame gasifiers, so as to solve the above-mentioned problems existing in the prior art.

[0005] To achieve the above objectives, the technical solution of the present invention is implemented as follows:

[0006] An on-site calibration device for the deformation of heat exchange tubes in an open-frame gasifier includes heat exchange plates and clamping components. One end of the clamping component is connected to the deformed tube, and the other end of the clamping component is connected to a mounting component. The calibration device includes at least three sets of clamping components, one set of clamping components is located outside the maximum deformation point, and the other two sets of clamping components are located inside the deformation point. The two sets of clamping components located inside the deformation point are spaced a certain distance apart vertically.

[0007] Furthermore, the clamping assembly includes a heat exchange tube clamping mold, a clamping support device, and a clamping device. The clamping mold is configured as a fixed mold with the same outline as the heat exchange tube. The clamping mold is connected to the deformable tube in the heat exchange plate. The clamping device is connected to the clamping mold, and the end of the clamping device away from the clamping mold is connected to the clamping support device. The clamping support device is connected to the mounting assembly.

[0008] Furthermore, the mounting assembly is a mounting fixture or an adjacent heat exchange plate.

[0009] Furthermore, the mounting fixture includes a first mounting fixture and a second mounting fixture. The first mounting fixture includes a first fixing beam and a second fixing beam. There are two first fixing beams and one second fixing beam. The second fixing beam and the two first fixing beams are arranged in parallel. The two first fixing beams are arranged vertically, and the plane formed by the two first fixing beams is parallel to the heat exchange plate. The second fixing beam is located on the other side of the heat exchange plate.

[0010] Furthermore, connecting blocks are provided at both ends of the beam. The upper ends of the two connecting blocks are respectively connected to the two ends of the upper first fixed beam, and the lower ends of the two connecting blocks are respectively connected to the two ends of the lower second fixed beam.

[0011] Furthermore, the second mounting fixture has the same structure as the first mounting fixture but is arranged in reverse.

[0012] Furthermore, the clamping support device is configured as an inter-plate clamping device, and the inter-plate clamping device has the same outline or partial outline as the adjacent heat exchange plates.

[0013] Furthermore, the inter-plate clamping device includes a fixed plate and a fixing clamp, wherein the fixed plate is connected to the clamping device, the fixing clamp is disposed on the side of the fixed plate away from the clamping device, and the fixing clamp is provided with multiple vertically extending arc-shaped cavities, the multiple arc-shaped cavities matching the contour of the heat exchange tube.

[0014] This invention also provides a method for on-site deformation correction of heat exchanger tubes in an open-frame gasifier, using the aforementioned on-site deformation correction device for heat exchanger tubes in an open-frame gasifier, wherein the on-site correction includes:

[0015] (1) The equipment is shut down, safety climbing facilities are prepared, and the work site meets the calibration conditions;

[0016] (2) Deformation measurement: The deformation of the deformed heat exchange tube is measured to determine the maximum deformation point;

[0017] (3) Install the alignment tooling so that the clamping mold, clamping device and clamping support device of one clamping component clamp the outer side of the maximum deformation of the upper and lower parts of the deformed heat exchange tube; the other two clamping components are aligned vertically and located on the inner side, and there should be a certain distance between the upper and lower parts of the two clamping components. The specific distance depends on the actual deformation of the heat exchange tube on site.

[0018] (4) Correction implementation: The correction of the deformed heat exchange tube is carried out in two stages. First stage: taking the center position of the heat exchange tube as the interface, above the position, a special tool is used to tighten the tube at the point of maximum deformation, so that the point of maximum deformation exceeds the center line by a first preset distance; below the position, the same method is used to tighten the tube at the point of maximum deformation, so that the point of maximum deformation exceeds the center line by a first preset distance, and the position is maintained for a preset time. Second stage: after the first stage is completed, the same method is used to tighten the tube at the point of maximum deformation on the platform, so that the deformed heat exchange tube exceeds the first preset distance. Below the middle platform, the tube is tightened at the point of maximum deformation, so that the deformed heat exchange tube exceeds the center line by a second preset distance, and the position is maintained for a preset time.

[0019] Furthermore, the first preset distance is set to 1 / 2 of the outer diameter of the heat exchange tube, and the second preset distance is set to 1 / 3 of the outer diameter of the heat exchange tube.

[0020] Compared with existing technologies, the on-site deformation correction method and apparatus for open-frame gasifier heat exchange tubes described in this invention have the following advantages:

[0021] The cold-state calibration method is adopted, that is, no preheating or heating is performed on the heat exchange tubes during plate calibration. Although this method increases the calibration difficulty, it ensures the original performance and reliability of the heat exchange tubes and meets the relevant management requirements for pressure vessels.

[0022] The non-destructive forming method ensures the overall reliability of the equipment by avoiding damage to the heat exchange tubes and the welds / points between components. All contact points with the heat exchange tubes are protected with dedicated heat exchange tube molds and protective cloths to prevent any damage to the heat exchange tubes. No treatment is done on the welds between the heat exchange tubes or the welds between the heat exchange tubes and the manifolds, ensuring the overall reliability and rigidity of the plates.

[0023] A specially designed clamping device is used to ensure that the alignment process is carried out slowly, avoiding damage to the heat exchange tubes due to excessive amplitude.

[0024] Based on the shape of the heat exchange tube, a special clamping device is used for support to ensure that the fins are not damaged. This facilitates the stability of the heat exchange tube during the calibration process, prevents rebound, and improves the calibration effect. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the calibration process in Embodiment 1 of the present invention;

[0026] Figure 2 This is a partial structural diagram illustrating the calibration process in Embodiment 1 of the present invention;

[0027] Figure 2a for Figure 2 The side view of the partial structure of the correction;

[0028] Figure 2b for Figure 2 A magnified view of part A in the middle;

[0029] Figure 3 This is a schematic diagram of the calibration process in Embodiment 2 of the present invention;

[0030] Figure 3a for Figure 3 Enlarged view of part A in the middle

[0031] Figure 4 This is a schematic diagram of the overall alignment of Embodiment 2 of the present invention;

[0032] Figure 5 This is the inter-plate clamping device in the alignment process of Embodiment 2 of the present invention.

[0033] Explanation of reference numerals in the attached figures:

[0034] 1. Open-frame vaporizer heat exchange plate; 2. First mounting fixture; 21. First fixing beam; 210. First connecting rod; 220. Second fixing beam; 23. Connecting device; 3. Second mounting fixture; 4. Tightening mold; 5. Tightening support device; 6. Tightening device; 7. Deformable heat exchange tube; 8. Plate-to-plate tightening device; 81. Fixing plate; 82. Fixing clamp. Detailed Implementation

[0035] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0036] like Figures 1-5As shown, an on-site straightening device for deformed heat exchange tubes in an open-frame gasifier includes heat exchange plates 1 and a clamping assembly. One end of the clamping assembly is connected to the deformed tube in the heat exchange plate 1, and the other end is connected to a clamping assembly. The clamping assembly includes a heat exchange tube clamping mold 4, a clamping support device 5, and a clamping device 6. The heat exchange tube clamping mold 4 is a fixed mold with the same contour as the heat exchange tube. The clamping mold 4 is connected to the deformed tube in the heat exchange plate 1. The clamping device 6 is connected to the clamping mold 4 and is located away from the heat exchange tube. One end of the clamping mold 4 is connected to the clamping support device 5, which is connected to the mounting assembly. The straightening device includes three sets of clamping components. One set of clamping components is located outside the maximum deformation point, and the other two sets of clamping components are located inside the deformation. The two sets of clamping components located inside the deformation are located at the upper and lower ends of the maximum deformation curve (the vertex), and there is a certain distance between the upper and lower parts of the two sets of clamping components located inside the deformation. That is, when performing on-site straightening, one set of clamping components and the other two sets of clamping components are located on both sides of the deformed tube.

[0037] Preferably, the two sets of clamping components located on the inner side of the deformation are arranged symmetrically, with the axis of the clamping component located outside the maximum deformation point as the axis of symmetry.

[0038] Furthermore, all three parts of the clamping assembly described in this invention are designed to be detachable, making it easy to replace the clamping support device 5 of the corresponding shape according to the on-site construction conditions.

[0039] The mounting assembly is a mounting fixture or an adjacent heat exchange plate, thereby achieving the tightening and adjustment of the deformed heat exchange tube.

[0040] When the mounting assembly is configured as a mounting fixture, the mounting fixture includes a first mounting fixture 2 and a second mounting fixture 3. The first mounting fixture 2 includes a first fixing beam 21 and a second fixing beam 22, wherein there are two first fixing beams 21 and one second fixing beam 22. The second fixing beam 22 and the two first fixing beams 21 are arranged parallel to each other, with the two first fixing beams 21 arranged vertically. The plane formed by the two first fixing beams 21 is parallel to the heat exchange plate 1, and the second fixing beam 22 is located on the other side of the heat exchange plate 1. Connecting devices 23 are provided at both ends of the second fixing beam 22, and the upper and lower ends of the connecting devices 23 are respectively connected to the same side of the two first fixing beams 21. The second mounting fixture 3 has the same structure as the first mounting fixture 2 but is arranged in the opposite direction. The cross-sections of the first fixing beam 21 and the second fixing beam 22 are both square or rectangular. The clamping mold 4 is configured as a fixed mold with the same contour as the heat exchange tube, and the clamping support device 5 has the same contour as the first fixed beam 21 or the second fixed beam 22, such that one end of the clamping assembly is connected to the deformable tube, and the other end of the clamping assembly is connected to the first fixed beam 21 or the second fixed beam 22. Preferably, the two first fixed beams 21 form a first plane, and the projection of the second fixed beam 22 onto the first plane is equidistant from the two first fixed beams 21.

[0041] Furthermore, such as Figure 2a As shown, two first fixed beams 21 in the same mounting fixture are vertically connected vertically by a first connecting rod 210. The first connecting rod 210 is a screw or other adjustable structure. By adjusting the first connecting rod 210, the distance between the two first fixed beams 21 can be adjusted to adjust the height of the same mounting assembly, thereby facilitating the adjustment of the clamping assembly's clamping position on the heat exchange plates. The upper and lower ends of the connecting device 23 in the same mounting fixture are respectively connected to the corresponding first fixed beams 21 by a second connecting rod 220. Both second connecting rods 220 are perpendicular to the first connecting rod 210. The second connecting rod 220 is also a screw or other adjustable structure. By adjusting the second connecting rod 220, the horizontal distance between the first fixed beam and the second fixed beam can be adjusted, thus adapting to the shaping of heat exchange tubes in plates with different plate spacings.

[0042] When the mounting assembly is set as adjacent heat exchange plates, the clamping support device 5 is set as the inter-plate clamping device 8. The inter-plate clamping device 8 has the same outline or partial outline as the adjacent heat exchange plates, so that one end of the clamping assembly is connected to the deformable tube and the other end of the clamping assembly is tightly connected to the adjacent heat exchange plates. This avoids relative displacement between the clamping assembly and the plates when the clamping force is adjusted by the clamping device 6, which would prevent the alignment from being achieved.

[0043] The interplate clamping device 8 includes a fixed plate 81 and a fixing clamp 82. The fixed plate 81 is connected to the clamping device 6, and the fixing clamp 82 is located on the side of the fixed plate 81 away from the clamping device 6. The fixing clamp 82 is provided with multiple arc-shaped cavities extending vertically. The multiple arc-shaped cavities match the contour of the heat exchange tube, thereby achieving the fixation of the clamping assembly away from the deformed heat exchange tube 7.

[0044] As one embodiment of the present invention, a clamping assembly is provided between two adjacent plates that do not require correction or between two adjacent plates with no deformation in corresponding parts. Both ends of the clamping assembly are provided with plate clamping devices 8. The two plate clamping devices 8 are respectively connected to the two plates and are connected by clamping devices 6.

[0045] The clamping device 6 is set as a hydraulic or other special power device. The clamping force on the heat exchange tube is adjusted by adjusting the clamping device 6 to ensure that the straightening process is carried out slowly and to avoid damage to the heat exchange tube due to excessive amplitude.

[0046] Example 1

[0047] As one embodiment of the present invention, the on-site correction device for the deformation of the heat exchange tube of the open-frame gasifier is the same as described above. When a deformed heat exchange tube is corrected on-site, if the corresponding part of the adjacent heat exchange plate is also deformed, a clamping fixture is used.

[0048] As part of this embodiment, a method for on-site deformation correction of heat exchange tubes in an open-frame gasifier is also provided. Taking the deformation correction of a heat exchange tube in the middle of a heat exchange plate as an example, the method specifically includes the following process:

[0049] (1) Equipment shutdown. First, the equipment should be stopped, the seawater in the seawater tank should be drained, and safe access facilities should be prepared;

[0050] (2) Replacement. The equipment should be purged with nitrogen.

[0051] (3) Plate cleaning. Clean the inside of the equipment, use a high-pressure water gun to clean the deformed heat exchange plates, remove surface deposits, and ensure that the work site meets the requirements for reshape adjustment;

[0052] (4) Deformation measurement. The deformation of the deformed heat exchanger tube numbered 40# was measured to determine the maximum deformation point. Since the heat exchanger tube deformation is S-shaped, it is necessary to confirm the upper and lower maximum deformation points.

[0053] (5) Installation of alignment fixtures. Figure 1The first clamping fixture 2 and the second clamping fixture 3 are respectively installed near the maximum deformation. This ensures that the clamping mold 4, clamping device 6 and clamping support device 5 of one clamping component clamp the outer side of the maximum deformation point of the deformed heat exchange tube 7 at the top and bottom. The other two clamping components are arranged vertically aligned and located on the inner side. The two clamping components should have a certain distance between them, and the distance should be calculated based on the position of the heat exchange tube and the amount of deformation.

[0054] (6) Shaping Implementation. The shaping of the deformed heat exchanger tube is carried out in two stages. The first stage: taking the center position of the heat exchanger tube as the interface, a special tool is used to tighten the tube at the point of maximum deformation above the center position, so that the maximum deformation point exceeds about 1 / 2 of the outer diameter of the heat exchanger tube in the direction of the center; the same applies to the point below the center position, so that the maximum deformation point exceeds about 1 / 2 of the outer diameter of the heat exchanger tube in the direction of the center, and this is maintained for a certain period of time. The second stage: after the first stage is completed, the same method is used to tighten the tube at the point of maximum deformation on the platform, so that the deformed heat exchanger tube exceeds about 1 / 2 of the outer diameter of the heat exchanger tube in the direction of the center, and below the center position of the heat exchanger tube, the tube is tightened at the point of maximum deformation, so that the deformed heat exchanger tube exceeds about 1 / 3 of the outer diameter of the heat exchanger tube in the direction of the center, and this is maintained for a certain period of time.

[0055] (6) Deformation measurement after straightening. The deformation of the deformed heat exchange tube is measured after straightening.

[0056] (7) Clean up the site. Remove the tools, hydraulic devices, scaffolding, etc. from the site and clean up the site.

[0057] Example 2

[0058] As one embodiment of the present invention, the open-frame gasifier heat exchange tube deformation field correction device is the same as that in Embodiment 1 except for the inter-plate clamping device 8. When a deformed heat exchange tube is corrected on-site, if there is no deformation in the corresponding part of the adjacent heat exchange plate, the clamping assembly is the adjacent heat exchange plate.

[0059] As part of this embodiment, a method for on-site deformation correction of heat exchange tubes in an open-frame gasifier is also provided. Taking the deformation correction of a heat exchange tube in the middle of a heat exchange plate as an example, the method specifically includes the following process:

[0060] (1) Equipment shutdown. First, the equipment should be stopped, the seawater in the seawater tank should be drained, and safe access facilities should be prepared;

[0061] (2) Replacement. The equipment should be purged with nitrogen.

[0062] (3) Plate cleaning. Clean the inside of the equipment, use a high-pressure water gun to clean the deformed heat exchange plates, remove surface deposits, and ensure that the work site meets the requirements for reshape adjustment;

[0063] (4) Deformation measurement. The deformation of the deformed heat exchanger tube numbered 41# was measured to determine the maximum deformation point. Since the heat exchanger tube deformation is S-shaped, it is necessary to confirm the upper and lower maximum deformation points.

[0064] (5) Tooling installation. [The tooling will be installed...] Figure 3 The clamping mold 4, clamping device 6, and clamping support device 5 clamp the upper and lower maximum deformation points of the deformable heat exchange tube 7, according to... Figure 4 The diagram shows that one of the clamping components is located outside the maximum deformation point; the other two clamping components are located inside, and there should be a certain distance between the upper and lower parts of the two clamping components; the inter-plate clamping device 8 is installed between the plates except for the maximum deformation point.

[0065] (6) Shaping Implementation. The shaping of the deformed heat exchanger tube is carried out in two stages. The first stage: using the center position of the heat exchanger tube as the interface, a special tool is used to tighten the tube at the point of maximum deformation above this position, ensuring that the deformation extends beyond approximately half of the outer diameter of the heat exchanger tube towards the center. The same method is applied below this position, ensuring that the deformation extends beyond approximately half of the outer diameter of the heat exchanger tube towards the center, and this is maintained for a certain period. The second stage: after the first stage is completed, the same method is used to tighten the tube at the point of maximum deformation on the platform, ensuring that the deformation extends beyond approximately half of the outer diameter of the heat exchanger tube. Below the intermediate platform, the same method is applied to tighten the tube at the point of maximum deformation, ensuring that the deformation extends beyond approximately one-third of the outer diameter of the heat exchanger tube towards the center, and this is maintained for a certain period. The shaping process is carried out slowly to ensure that all plates are tightly fitted together.

[0066] (7) Deformation measurement after straightening. The deformation of the deformed heat exchange tube is measured after straightening.

[0067] (8) Clean up the site. Remove tools, hydraulic devices, scaffolding, etc. from the site and clean up the site.

[0068] While the present invention has been disclosed above, it is not limited thereto. Any person skilled in the art can make various modifications and alterations without departing from the spirit and scope of the invention; therefore, the scope of protection of the present invention should be determined by the scope defined in the claims.

Claims

1. A device for on-site deformation correction of heat exchange tubes in an open-frame gasifier, characterized in that, The device includes heat exchange plates (1) and a clamping assembly. One end of the clamping assembly is connected to the deformable tube, and the other end is connected to the mounting assembly. The straightening device includes at least three sets of clamping assemblies, one set of which is located outside the maximum deformation point, and the other two sets are located inside the deformation point. The two sets of clamping assemblies located inside the deformation point are arranged vertically. The clamping assembly includes a heat exchange tube clamping mold (4), a clamping support device (5), and a clamping device (6). The clamping mold (4) is a fixed mold with the same outline as the heat exchange tube. The clamping mold (4) is connected to the deformable tube in the heat exchange plate (1). The clamping device (6) is connected to the clamping mold (4), and the end of the clamping device (6) away from the clamping mold (4) is connected to the clamping support device (5). The clamping support device (5) is connected to the clamping assembly. The clamping assembly is a clamping fixture or a fixture connected to an adjacent heat exchange plate. If the corresponding part of the adjacent heat exchange plate is also deformed, the clamping assembly is a clamping fixture. The clamping fixture includes a first clamping fixture (2) and a second clamping fixture (3). The first clamping fixture (2) includes a first fixing beam (21) and a second fixing beam (22). The first fixing beam (21) is set as two beams, and the second fixing beam (22) is set as one beam. The second fixing beam (22) and the two first fixing beams (21) are arranged in parallel. The two first fixing beams (21) are arranged vertically, and the plane formed by the two first fixing beams (21) is parallel to the heat exchange plate (1). The second fixing beam (22) is located on the other side of the heat exchange plate (1). If there is no deformation in the corresponding part of the adjacent heat exchange plates, the mounting assembly is the adjacent heat exchange plates, and the clamping support device (5) is set as the inter-plate clamping device (8). The inter-plate clamping device (8) has the same outline or partial outline as the adjacent heat exchange plates.

2. The on-site calibration device according to claim 1, characterized in that, The second fixed beam (22) is provided with connecting devices (23) at both ends. The upper and lower ends of the connecting devices (23) are respectively connected to the same side of the two first fixed beams (21). The two first fixed beams (21) in the same mounting fixture are vertically connected by the first connecting rod (210). The upper and lower ends of the connecting devices (23) in the same mounting fixture are respectively connected to the corresponding first fixed beams (21) by a second connecting rod (220). The first connecting rod (210) and the second connecting rod (220) are both set as adjustable structures.

3. The on-site calibration device according to claim 1, characterized in that, The second mounting fixture (3) has the same structure as the first mounting fixture (2) but is reversed.

4. The on-site calibration device according to claim 1, characterized in that, The interplate clamping device (8) includes a fixed plate (81) and a fixing clamp (82), wherein the fixed plate (81) is connected to the clamping device (6), and the fixing clamp (82) is located on the side of the fixed plate (81) away from the clamping device (6). The fixing clamp (82) is provided with multiple arc-shaped cavities extending vertically, and the multiple arc-shaped cavities match the contour of the heat exchange tube.

5. A method for on-site deformation correction of heat exchange tubes in an open-frame gasifier, characterized in that, The on-site deformation correction device for open-frame gasifier heat exchange tubes according to any one of claims 1 to 4 is characterized in that it comprises: (1) The equipment is shut down, safety climbing facilities are prepared, and the work site meets the calibration conditions; (2) Deformation measurement: The deformation of the deformed heat exchange tube is measured to determine the maximum deformation point; (3) The alignment tooling is installed so that the clamping mold, clamping device and clamping support device of one clamping component clamp the outer side of the maximum deformation of the upper and lower parts of the deformed heat exchange tube; the other two clamping components are aligned vertically and located on the inner side, and the upper and lower parts of the two clamping components are set with a certain distance, the size of the distance is calculated according to the position of the heat exchange tube and the amount of deformation. (4) Correction implementation: The correction of the deformed heat exchange tube is carried out in two stages. First stage: with the center position of the heat exchange tube as the interface, the clamping component is used to clamp the tube above the position at the point of maximum deformation, so that the point of maximum deformation exceeds the center line by a first preset distance; the same applies to the point below the position, so that the point of maximum deformation exceeds the center line by a first preset distance, and the position is maintained for a preset time. Second stage: after the first stage is completed, the platform is clamped at the point of maximum deformation using the same method, so that the deformed heat exchange tube exceeds the first preset distance. Below the middle of the heat exchange tube, the tube is clamped at the point of maximum deformation, so that the deformed heat exchange tube exceeds the center line by a second preset distance, and the position is maintained for a preset time.

6. The on-site calibration method according to claim 5, characterized in that, The first preset distance is set to 1 / 2 of the outer diameter of the heat exchange tube, and the second preset distance is set to 1 / 3 of the outer diameter of the heat exchange tube.

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