On-site shape correcting device and method for deformation of heat exchange tube of open-frame vaporizer

Abstract

The invention provides an open-frame vaporizer heat exchange tube deformation on-site shape correcting device and method.The open-frame vaporizer heat exchange tube deformation on-site shape correcting device comprises a heat exchange plate and jacking assemblies, one end of each jacking assembly is connected and makes contact with a deformation tube, the other end of each jacking assembly is connected with a clamping assembly, and the shape correcting device comprises at least three sets of jacking assemblies; wherein one set of jacking assembly is located on the outer side of the maximum vertical deformation position, the other two sets of jacking assemblies are located on the inner side of the deformation position, a certain interval is arranged between the two sets of jacking assemblies located on the inner side of the deformation position in the vertical direction, and the interval is determined according to the actual situation of the heat exchange tube. According to the shape correcting device and method, a lossless shape correcting mode is adopted, heat exchange tubes are not damaged, welding seams between parts of equipment are not damaged, and the overall reliability of the equipment is guaranteed. Slow sizing is guaranteed, and heat exchange tube damage caused by overlarge amplitude is avoided. According to the shape of the heat exchange tube, the special jacking device is adopted for supporting, it is guaranteed that the fins are not damaged, the stability of the heat exchange tube is conveniently guaranteed during shape correction construction, springback is prevented, and the correction effect is improved.

Description

Technical Field

[0001] The invention relates to the technical field of open-frame gasifier heat exchange equipment, and in particular to an on-site shape correction device and method for deformation of a heat exchange tube of an open-frame gasifier. Background Art

[0002] Open Rack Vaporizers (ORV) are large-scale basic load vaporization devices that use seawater as a heat source to vaporize LNG. They have the advantages of low economic cost, energy saving, environmental protection, and high reliability. They are one of the key equipment responsible for gasification and export in LNG receiving stations. Its basic heat exchange unit is a specially designed heat exchange tube, which is generally in the shape of a fin. Each heat exchange tube generally has 8 to 10 fins. A heat transfer accelerator is installed in the tube to improve the heat transfer coefficient. The length of the heat exchange tube is generally 5500 to 6500 mm. A heat exchange plate is connected to the inlet and outlet pipelines by multiple heat exchange tubes arranged in parallel. The two ends of the heat exchange tube are connected to the inlet and outlet pipelines by pipe welding; generally 4 to 6 heat exchange plates form a module, and usually a vaporizer consists of 2 to 4 modules. Seawater overflows from the seawater tank and sprays on the surface of the plate-shaped tube bundle from top to bottom, and LNG flows from bottom to top in the heat exchange tube. Heat is transferred using seawater as a heat source to heat and vaporize LNG. However, when the seawater is unevenly distributed on the surface of the heat exchange plate, such as when foreign matter adheres to the surface of the heat exchange plate, the overflow of the seawater tank is blocked by foreign matter, or the local seawater flow is low, the heat exchange tube will be unevenly stressed and deformed, affecting safe operation.

[0003] The design life of an ORV is usually 25 years. During production and operation, a few heat exchange tubes may be deformed and need to be evaluated and repaired. Therefore, how to achieve non-destructive correction of heat exchange plates without dismantling the equipment or damaging the heat exchange tubes is an urgent 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 shape correction device and method for deformation of heat exchange tubes of an open-frame gasifier, so as to solve the above-mentioned problems existing in the prior art.

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

[0006] A field correction device for deformation of an open-frame gasifier heat exchange tube comprises a heat exchange plate and a tightening assembly, one end of the tightening assembly is connected and in contact with the deformation tube, and the other end of the tightening assembly is connected to a clamping assembly. The correction device comprises at least three sets of tightening assemblies, one set of which is located outside the upper and lower maximum deformation positions, and the other two sets of tightening assemblies are located inside the deformation, and a certain distance is set above and below the two sets of tightening assemblies located inside the deformation.

[0007] Furthermore, the tightening assembly includes a heat exchange tube tightening mold, a tightening support device and a tightening device, wherein the tightening mold is set as a fixed mold with the same contour as the heat exchange tube, the tightening mold is connected and contacted with the deformed tube in the heat exchange plate, the tightening device is connected to the tightening mold, and the end of the tightening device away from the tightening mold is connected to the tightening support device, and the tightening support device is connected to the clamping assembly.

[0008] Furthermore, the clamping assembly is a clamping tool 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 fixed beam and a second fixed beam, the first fixed beam is set to two, the second fixed beam is set to one, the second fixed beam and the two first fixed beams are arranged in parallel, the two first fixed beams are arranged up and down, and the plane formed by the two first fixed beams is parallel to the heat exchange plate, and the second fixed beam is located on the other side of the heat exchange plate.

[0010] Furthermore, connecting blocks are provided at both ends of the , 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 clamping tool has the same structure as the first clamping tool and is arranged in the opposite direction.

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

[0013] Furthermore, the clamping device between the plates includes a fixing plate and a fixing clamp, wherein the fixing plate is connected to the clamping device, the fixing clamp is arranged on a side of the fixing plate away from the clamping device, and the fixing clamp is provided with a plurality of arc-shaped concave cavities extending up and down, and the plurality of arc-shaped concave cavities match the contour of the heat exchange tube.

[0014] The present invention also provides an on-site shape correction method for deformation of heat exchange tubes of an open-frame gasifier, using the on-site shape correction device for deformation of heat exchange tubes of an open-frame gasifier described above, wherein the on-site shape correction comprises:

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

[0016] (2) Deformation measurement: measure the deformation of the deformed heat exchange tube and determine the maximum deformation point;

[0017] (3) The shaping tooling is installed so that the tightening mold, tightening device and tightening support device of one tightening assembly tighten the outer side of the upper and lower maximum deformation of the deformed heat exchange tube; the other two tightening assemblies are aligned up and down and located on the inner side. There should be a certain distance between the two tightening assemblies, and the specific distance depends on the actual deformation of the heat exchange tube on site;

[0018] (4) Correction implementation: Correction of deformed heat exchange tubes is carried out in two stages. The first stage: with the center position of the heat exchange tube as the interface, a special tool is used to tighten the maximum deformation point above the position, so that the maximum point exceeds the first preset distance of the center line toward the center; below the position, the maximum point is also made to exceed the first preset distance of the center line toward the center, and maintained for a preset time; the second stage: after the first stage is completed, the same method is used to tighten the maximum point on the platform, so that the deformed heat exchange tube exceeds the first preset distance, and below the middle platform, it is tightened at the maximum point, so that the deformed heat exchange tube exceeds the second preset distance of the center line toward the center, and 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 the prior art, the on-site shape correction method and device for deformation of heat exchange tubes of an open-frame gasifier described in the present invention have the following advantages:

[0021] A cold calibration method is adopted, that is, when the plate is calibrated, the heat exchange tube is not preheated or heated. Although this method increases the difficulty of calibration, it ensures the original performance and reliability of the heat exchange tube and meets the relevant management requirements of pressure vessels.

[0022] The non-destructive correction method is adopted, which does not damage the heat exchange tubes and the welds / points between the parts, ensuring the overall reliability of the equipment. All the contact points with the heat exchange tubes use special heat exchange tube molds and protective cloth to ensure that the heat exchange tubes are not damaged in any way; no treatment is done on the welding points between the heat exchange tubes and the welds between the headers, ensuring the overall reliability and rigidity of the plate.

[0023] A special tightening device is used to ensure that the correction process is carried out slowly to avoid damage to the heat exchange tubes due to excessive amplitude.

[0024] According to the shape of the heat exchange tube, a special tightening device is used to support it to ensure that the fins are not damaged. This is convenient for ensuring the stability of the heat exchange tube during the correction construction, preventing rebound and improving the correction effect. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0026] Figure 2 This is a schematic partial structural diagram of the calibration of Example 1 of the present invention;

[0027] Figure 2a for Figure 2 A side view of the local structure of the correction;

[0028] Figure 2b for Figure 2 A partial enlarged view of the middle A area;

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

[0030] Figure 3a for Figure 3 A partial enlarged view of the A part

[0031] Figure 4 This is an overall schematic diagram of the shape correction of Example 2 of the present invention;

[0032] Figure 5 This is a tightening device between plates in the shape correction process of Example 2 of the present invention.

[0033] Description of reference numerals:

[0034] Open-frame gasifier heat exchange plate 1; first clamping tool 2; first fixed beam 21; first connecting rod 210; second connecting rod 220; second fixed beam 22; connecting device 23; second clamping tool 3; jacking mold 4; jacking support device 5; jacking device 6; deformed heat exchange tube 7; jacking device 8 between plates; fixed plate 81; fixed fixture 82 DETAILED DESCRIPTION

[0035] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0036] like Figures 1 to 5As shown, an open-frame gasifier heat exchange tube deformation on-site correction device includes a heat exchange plate 1 and a tightening assembly, one end of the tightening assembly is connected and contacted with the deformed tube in the heat exchange plate 1, and the other end of the tightening assembly is connected to the clamping assembly. The tightening assembly includes a heat exchange tube tightening mold 4, a tightening support device 5 and a tightening device 6, wherein the heat exchange tube tightening mold 4 is set as a fixed mold with the same profile as the heat exchange tube, the tightening mold 4 is connected and contacted with the deformed tube in the heat exchange plate 1, and the tightening device 6 is connected to the tightening mold 4, and the tightening device 6 is away from One end of the tightening mold 4 is connected to the tightening support device 5, and the tightening support device 5 is connected to the clamping assembly. The correction device includes three sets of tightening assemblies, one of which is located on the outside of the maximum deformation, and the other two sets of tightening assemblies are located on the inside of the deformation. The two sets of tightening assemblies located on the inside of the deformation are respectively at the upper and lower ends of the maximum deformation curve (vertex), and the two sets of tightening assemblies located on the inside of the deformation have a certain distance between them, that is, when performing on-site correction, one set of tightening assemblies and the other two sets of tightening assemblies are respectively located on both sides of the deformation tube.

[0037] Preferably, the axis of the tightening assembly located outside the maximum deformation is taken as the axis of symmetry, and the two sets of tightening assemblies located inside the deformation are symmetrically arranged up and down.

[0038] Furthermore, the three parts of the jacking assembly described in the present invention are all configured as detachable components, so as to facilitate replacement of the jacking support device 5 of a corresponding shape according to the on-site construction conditions.

[0039] The clamping assembly is a clamping fixture or adjacent heat exchange plates, so as to realize the tightening adjustment of the deformed heat exchange tube.

[0040] When the clamping assembly is set as a clamping fixture, the clamping fixture includes a first clamping fixture 2 and a second clamping fixture 3, and the first clamping fixture 2 includes a first fixed beam 21 and a second fixed beam 22, wherein two first fixed beams 21 are set, and one second fixed beam 22 is set, and the second fixed beam 22 and the two first fixed beams 21 are set in parallel, and the two first fixed beams 21 are set up and down, and the plane formed by the two first fixed beams 21 is parallel to the heat exchange plate 1, and the second fixed beam 22 is located on the other side of the heat exchange plate 1. Connecting devices 23 are set at both ends of the second fixed beam 22, and the upper and lower ends of the connecting device 23 are respectively connected to the same side of the two first fixed beams 21. The second clamping fixture 3 has the same structure as the first clamping fixture 2 and is set in the opposite direction. The cross-sections of the first fixed beam 21 and the second fixed beam 22 are both square or rectangular structures. The jacking mold 4 is set as a fixed mold with the same profile as the heat exchange tube, and the jacking support device 5 has the same profile as the first fixed beam 21 or the second fixed beam 22, so that one end of the jacking assembly is connected to the deformable tube, and the other end of the jacking 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 on the first plane is equidistant from the two first fixed beams 21.

[0041] Further, such as Figure 2a As shown, the two first fixed beams 21 in the same clamping fixture are vertically connected up and down through the first connecting rod 210, and the first connecting rod 210 is set as a screw or other adjustable structure. By adjusting the first connecting rod 210, the spacing between the two first fixed beams 21 can be adjusted to adjust the height of the same clamping assembly, thereby facilitating the adjustment of the tightening position of the heat exchange plate by the tightening assembly. The upper end and the lower end of the connecting device 23 in the same clamping fixture are respectively connected to the corresponding first fixed beam 21 through a second connecting rod 220, and the two second connecting rods 220 are perpendicular to the first connecting rod 210. The second connecting rod 220 is also set as a screw or other adjustable structure. By adjusting the second connecting rod 220, the horizontal spacing between the first fixed beam and the second fixed beam can be adjusted, thereby being suitable for the heat exchange tube correction in the plate with different plate spacing.

[0042] When the clamping assembly is set to adjacent heat exchange plates, the tightening support device 5 is set to a tightening device 8 between plates, and the tightening device 8 between plates has the same contour or partial contour as the adjacent heat exchange plates, so that one end of the tightening assembly is connected to the deformation tube, and the other end of the tightening assembly is tightly connected to the adjacent heat exchange plate, avoiding relative displacement between the tightening assembly and the plate when the tightening force is adjusted by the tightening device 6, resulting in the inability to achieve shape correction.

[0043] The inter-plate tightening device 8 includes a fixing plate 81 and a fixing clamp 82, wherein the fixing plate 81 is connected to the tightening device 6, and the fixing clamp 82 is arranged on the side of the fixing plate 81 away from the tightening device 6. The fixing clamp 82 is provided with a plurality of arc-shaped concave cavities extending up and down, and the plurality of arc-shaped concave cavities match the contour of the heat exchange tube, thereby achieving the fixation of the tightening assembly away from the deformed heat exchange tube 7.

[0044] As an implementation of the present invention, a tightening assembly is arranged between two adjacent plates that do not need to be shaped or between two adjacent plates whose corresponding parts are not deformed, and tightening devices 8 between the plates are arranged at both ends of the tightening assembly. The two tightening devices 8 between the plates are respectively connected to the two plates, and the two tightening devices 8 between the plates are connected through a tightening device 6.

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

[0046] Embodiment 1

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

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

[0050] (2) Replacement. The equipment should be replaced 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 attachments, and ensure that the work site meets the calibration conditions;

[0052] (4) Deformation measurement. Measure the deformation of the deformed heat exchange tube No. 40 to determine the maximum deformation point. Since the heat exchange tube deforms in an S shape, it is necessary to confirm the upper and lower maximum deformation points.

[0053] (5) Install the alignment tool. Figure 1The first clamping fixture 2 and the second clamping fixture 3 are respectively installed near the maximum deformation. The clamping mold 4, the clamping device 6 and the clamping support device 5 of one clamping assembly are clamped on the outside of the upper and lower maximum deformation of the deformed heat exchange tube 7; the other two clamping assemblies are aligned up and down and located on the inside. There should be a certain distance between the two clamping assemblies, and the distance is calculated according to the position of the heat exchange tube and the deformation amount.

[0054] (6) Implementation of shape correction. The shape correction of the deformed heat exchange tube is carried out in two stages. The first stage: with the center position of the heat exchange tube as the interface, a special tool is used to tighten the maximum deformation point above the position, so that the maximum point exceeds about 1 / 2 of the outer diameter of the heat exchange tube toward the center; below the position, the maximum point is also made to exceed 1 / 2 of the outer diameter of the heat exchange tube toward the center, and it is maintained for a certain time; the second stage: after the first stage is completed, the same method is used to tighten the maximum point on the platform, so that the deformed heat exchange tube exceeds about 1 / 2 of the outer diameter of the heat exchange tube, and below the middle of the heat exchange tube, tighten it at the maximum point, so that the deformed heat exchange tube exceeds about 1 / 3 of the outer diameter of the heat exchange tube toward the center, and it is maintained for a certain time.

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

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

[0057] Embodiment 2

[0058] As one of the embodiments of the present invention, the on-site correction device for deformation of the heat exchange tube of an open-frame gasifier has the same structure as that of the first embodiment except for the tightening device 8 between the plates. When a deformed heat exchange tube is corrected on-site, if there is no deformation at the corresponding parts of the adjacent heat exchange plates, the clamping components are the adjacent heat exchange plates.

[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 steps:

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

[0061] (2) Replacement. The equipment should be replaced 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 attachments, and ensure that the work site meets the calibration conditions;

[0063] (4) Deformation measurement. Measure the deformation of the deformed heat exchange tube No. 41 to determine the maximum deformation point. Since the heat exchange tube deforms in an S shape, it is necessary to confirm the upper and lower maximum deformation points.

[0064] (5) Installation of tooling. Figure 3 The middle tightening mold 4, the tightening device 6 and the tightening support device 5 tighten the upper and lower maximum deformation points of the deformed heat exchange tube 7 according to Figure 4 As shown in the schematic diagram, one of the tightening components is located outside the upper and lower maximum deformation points; the other two tightening components are located inside, and there should be a certain distance between the two tightening components; the tightening device 8 between the plates is installed between the other plates except the maximum deformation point.

[0065] (6) Implementation of shape correction. The shape correction of the deformed heat exchange tube is carried out in two stages. The first stage: take the center position of the heat exchange tube as the interface, and use special tooling to tighten the maximum deformation point above the position, so that the maximum point exceeds about 1 / 2 of the outer diameter of the heat exchange tube toward the center; below the position, the maximum point is also made to exceed 1 / 2 of the outer diameter of the heat exchange tube toward the center, and keep it for a certain time; the second stage: after the first stage is completed, use the same method to tighten the maximum point on the platform, so that the deformed heat exchange tube exceeds about 1 / 2 of the outer diameter of the heat exchange tube, and below the middle platform, tighten it at the maximum point, so that the deformed heat exchange tube exceeds about 1 / 3 of the outer diameter of the heat exchange tube toward the center, and keep it for a certain time. The shape correction process is carried out slowly to ensure that each plate is in a tight state.

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

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

[0068] Although the present invention is disclosed as above, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the scope defined by the claims.

Claims

1. An open-frame gasifier heat exchange tube deformation on-site correction device, characterized in that: The device comprises a heat exchange plate (1) and a tightening assembly, wherein one end of the tightening assembly is connected to and in contact with a deformation tube, and the other end of the tightening assembly is connected to a clamping assembly. The correction device comprises at least three sets of tightening assemblies, wherein one set of tightening assemblies is located outside the upper and lower maximum deformation positions, and the other two sets of tightening assemblies are located inside the deformation, and the two sets of tightening assemblies located inside the deformation are arranged up and down.

2. The on-site shape correction device according to claim 1, characterized in that: The tightening assembly comprises a heat exchange tube tightening mold (4), a tightening support device (5) and a tightening device (6), wherein the tightening mold (4) is configured as a fixed mold having the same profile as the heat exchange tube, the tightening mold (4) is connected to and in contact with the deformable tube in the heat exchange plate (1), the tightening device (6) is connected to the tightening mold (4), and one end of the tightening device (6) away from the tightening mold (4) is connected to the tightening support device (5), and the tightening support device (5) is connected to the clamping assembly.

3. The on-site shape correction device according to claim 1, characterized in that: The clamping assembly is a clamping tool or an adjacent heat exchange plate.

4. The on-site shape correction device according to claim 3, characterized in that: The clamping fixture comprises a first clamping fixture (3) and a second clamping fixture (2); the first clamping fixture (2) comprises a first fixed beam (21) and a second fixed beam (22); two first fixed beams (21) are provided, and one second fixed beam (22) is provided; the second fixed beam (22) and the two first fixed beams (21) are provided in parallel; the two first fixed beams (21) are provided up and down, and a plane formed by the two first fixed beams (21) is parallel to the heat exchange plate (1); and the second fixed beam (22) is located on the other side of the heat exchange plate (1).

5. The on-site shape correction device according to claim 4, characterized in that: Connecting devices (23) are provided at both ends of the second fixed beam (22); the upper and lower ends of the connecting device (23) are respectively connected to the same side of the two first fixed beams (21); the two first fixed beams (21) in the same clamping fixture are vertically connected up and down through a first connecting rod (210); the upper end and the lower end of the connecting device (23) in the same clamping fixture are respectively connected to the corresponding first fixed beam (21) through a second connecting rod (220); the first connecting rod (210) and the second connecting rod (220) are both configured as adjustable structures.

6. The on-site shape correction device according to claim 3, characterized in that: The second clamping tool (3) has the same structure as the first clamping tool (2) and is arranged in reverse.

7. The on-site shape correction device according to claim 3, characterized in that: The tightening support device (5) is configured as an inter-plate tightening device (8), and the inter-plate tightening device (8) has the same profile or partial profile as the adjacent heat exchange plates.

8. The on-site shape correction device according to claim 7, characterized in that: The plate-to-plate tightening device (8) comprises a fixing plate (81) and a fixing clamp (82), wherein the fixing plate (81) is connected to the tightening device (6), and the fixing clamp (82) is arranged on a side of the fixing plate (81) away from the tightening device (6), and the fixing clamp (82) is provided with a plurality of arc-shaped concave cavities extending upward and downward, and the plurality of arc-shaped concave cavities match the contour of the heat exchange tube.

9. A method for on-site correction of deformation of heat exchange tubes of an open-frame gasifier, characterized in that: The on-site shape correction device for deformation of heat exchange tubes of an open-frame gasifier according to any one of claims 1 to 9 is characterized by comprising: (1) The equipment is shut down, safe climbing facilities are prepared, and the operation site meets the calibration conditions; (2) Deformation measurement: measure the deformation of the deformed heat exchange tube and determine the maximum deformation point; (3) The shaping tooling is installed so that the tightening mold, tightening device and tightening support device of one tightening assembly tighten the outer side of the upper and lower maximum deformation of the deformed heat exchange tube; the other two tightening assemblies are aligned up and down and located on the inner side, and a certain distance is set between the two tightening assemblies, and the distance is calculated according to the position of the heat exchange tube and the deformation amount; (4) Correction implementation: Correction of deformed heat exchange tubes is carried out in two stages. The first stage: with the center position of the heat exchange tube as the interface, a special tool is used to tighten the maximum deformation point above the position, so that the maximum point exceeds the first preset distance of the center line toward the center; below the position, the maximum point is also made to exceed the first preset distance of the center line toward the center, and maintained for a preset time; the second stage: after the first stage is completed, the same method is used to tighten the maximum point on the platform, so that the deformed heat exchange tube exceeds the first preset distance, and below the middle of the heat exchange tube, tighten it at the maximum point, so that the deformed heat exchange tube exceeds the second preset distance of the center line toward the center, and maintain it for a preset time.

10. The on-site shape correction method according to claim 3, 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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