Heat exchanger tube plate repairing device

Abstract

The invention provides a heat exchanger tube plate repairing device. The heat exchanger tube plate repairing device comprises a tube plate, a base layer plate, a corrosion-resistant layer plate, a heat exchange tube and a welding connector. A tube hole is formed in the tube plate; the heat exchange tubes are connected with the tube plate by penetrating through the tube holes; the heat exchange tube and the tube plate are welded to form the welding joint; and the base layer plate and the corrosion-resistant layer plate which are arranged in an overlapped manner are arranged at the concave pit of the tube plate. According to the technical scheme, the structure is simple and reasonable, practicability is good, construction is easy, surfacing and postweld heat treatment at the pothole of the tube plate are avoided, meanwhile, the adverse effect of deformation of the tube plate caused by overall surfacing is avoided, the neck clamping problem during repairing of the corrosion pothole of the tube plate of the high-pressure heat exchanger is solved, and the service life of the tube plate is prolonged. The method can be used for repairing corrosion pits of various high-pressure heat exchanger tube plates, various expenses are fully saved, and the repairing efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of heat exchange devices, and in particular to a heat exchanger tube sheet repair device. Background Art

[0002] After use, some heat exchangers often develop large corrosion pits on the tube sheets due to the influence of operating conditions and operation processes. The tube sheet is the core component of the entire heat exchanger. Replacing the tube sheet and replacing the entire equipment is very expensive. Direct surfacing welding on the tube sheet holes cannot solve the problem of how to heat treat the tube sheet. Summary of the Invention

[0003] In response to the technical problems mentioned in the above background technology, a heat exchanger tube sheet repair device is provided. The technical means adopted by the present invention are as follows: A heat exchanger tube sheet repair device, comprising: Tube sheet, base layer, corrosion-resistant layer, heat exchange tube and welding joint; the tube sheet is provided with tube holes; The heat exchange tube is connected to the tube sheet by passing through the tube hole; the heat exchange tube and the tube sheet are welded to form the welded joint; the base layer and the corrosion-resistant layer are stacked and arranged at the pit of the tube sheet.

[0004] Furthermore, the thickness of the base layer is 8-12 mm.

[0005] Furthermore, the thickness of the corrosion-resistant plate is 12-20 mm.

[0006] Furthermore, the corrosion-resistant layer plate is made of the same material as the heat exchanger tube.

[0007] Furthermore, a corrosion-resistant layer is provided on the outermost side of the base layer.

[0008] Furthermore, the welded joint is a fillet weld.

[0009] Furthermore, a T-shaped step is provided between the base layer plate and the corrosion-resistant layer plate; the T-shaped step is the gap between the layer plate and the tube plate.

[0010] Compared with the prior art, the present invention has the following advantages: The technical solution of the present invention has a simple and reasonable structure, good practicality, and is easy to construct. It avoids surfacing welding and post-weld heat treatment at the pits in the tube sheet, and at the same time avoids the adverse effects of deformation of the tube sheet caused by overall surfacing welding. It solves the bottleneck problem of repairing corrosion pits in the tube sheet of high-pressure heat exchangers and can be used for repairing corrosion pits in various high-pressure heat exchanger tube sheets, which fully saves various expenses and improves repair efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0012] Figure 1 This is a schematic diagram of the tube sheet hole layer repair method according to the present invention.

[0013] Figure 2 Schematic diagram of the pipe head welding joint of the present invention.

[0014] Figure 3 Schematic diagram of the arrangement of the tube holes of the present invention.

[0015] Figure 4 Detailed schematic diagram of the pores of the present invention.

[0016] In the figure: 1. Tube sheet; 2. Base layer; 3. Corrosion-resistant layer; 4. Heat exchange tube; 5. Tube head welding joint; 6. Tube sheet corrosion-resistant layer. DETAILED DESCRIPTION

[0017] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments of the present invention can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0018] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0019] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0020] Unless otherwise specifically stated, the relative arrangement of the parts and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention. At the same time, it should be clear that, for ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be considered as part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following figures, and therefore, once an item is defined in one figure, it does not need to be further discussed in subsequent figures.

[0021] In the description of the present invention, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, vertical, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention: the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0022] For ease of description, spatially relative terms such as "above," "above," "on the upper surface of," and "above" may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is inverted, a device described as "above" or "on top of" another device or structure would then be positioned as "below" or "below" the other device or structure. Thus, the exemplary term "above" may include both the orientations of "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used herein should be interpreted accordingly.

[0023] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0024] It includes a tube sheet 1, a base layer plate 2, a corrosion-resistant layer plate 3, a heat exchange tube 4, a tube head welding joint 5, and a tube sheet corrosion-resistant layer 6.

[0025] like Figure 1 As shown, the base layer 2 and the corrosion-resistant layer 3 are generally made of Q345R and are 12mm thick. The corrosion-resistant layer is generally made of stainless steel and is 20mm thick. The size of the layers is determined based on the specific conditions of the corrosion pits.

[0026] like Figure 1 、 2 As shown, before repairing the pothole, the heat exchange tube head weld must be cleaned first. In order to ensure the heat exchange effect, the heat exchange tube needs to be used again. When cleaning the weld leg weld, ensure that the heat exchange tube is not damaged.

[0027] like Figure 1 、 2 As shown, the pipe head welding joints should be cleaned thoroughly, and the heat exchange tubes should be pulled out from the back side of the corrosion pit by a distance greater than the depth of the pit to ensure that the layer repair can be carried out normally.

[0028] like Figure 1 As shown, the corrosion pits are cleaned with special tools to ensure that all defects are removed, and T-shaped steps are set according to the 12mm layer thickness.

[0029] like Figure 1 As shown, each layer of board should be cut according to the actual size of the pit. Each layer of board should be cut accurately to ensure the contact distance and gap control with the T-shaped step.

[0030] like Figure 1 As shown, each layer of the plate is fixed to the tube sheet by welding. The welding should be carried out strictly according to the welding process to ensure that the weld leg size meets the requirements.

[0031] like Figure 1 As shown in the figure, the T-shaped step weld between each layer and the tube sheet should be cleaned after welding and polished until it is flush with the layer surface.

[0032] like Figure 1 As shown, the T-shaped step welds between each layer and the tube sheet should be subjected to corresponding non-destructive testing according to the requirements of the process documents to ensure that the weld quality meets the requirements.

[0033] like Figure 1 As shown, the material of the outermost corrosion-resistant layer should be selected according to the medium conditions. At the same time, it should be confirmed when assembling the outermost layer to ensure the correctness of the material and welding process, and ultimately ensure that the corrosion resistance of the tube sheet meets the requirements.

[0034] like Figure 3 、 4As shown, mark the repaired area of ​​the layer plate according to the heat exchange tube hole layout diagram and make the tube hole positioning marks.

[0035] like Figure 3 As shown, drill according to the hole positioning mark. Other parent materials should not be damaged during the drilling process. At the same time, the hole should be beveled according to the drawing.

[0036] like Figure 1 、 2 As shown, the heat exchange tubes in the repaired area of ​​the tube sheet are reinstalled and then dimensioned to ensure that the extension distance of the tube heads meets the requirements.

[0037] like Figure 2 As shown, the heat exchange tubes and tube sheets are tack welded without filler wire. After tack welding, the first pass of pipe head welding is performed using argon arc welding. After the first pass of welding, a penetration test and a leak test are performed to check if there are any leaks at the weld joints at the pipe head.

[0038] like Figure 2 As shown, the pipe head is welded with filler wire for the second time, and a penetration test is performed after welding to ensure that the weld joint of the pipe head is free of defects.

[0039] like Figure 1 As shown in the figure, after the overall repair is completed, a pressure test shall be carried out according to the original technical requirements. After passing the pressure test, it can be put into normal use.

[0040] Based on the structural diagram of the present invention and according to the above implementation scheme, the base layer 2 and the corrosion-resistant layer 3 are welded together and the layer repair method is adopted to achieve the overall repair of the corrosion pits in the tube sheet.

[0041] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A heat exchanger tube sheet repair device, characterized in that: include: Tube sheet, base layer, corrosion-resistant layer, heat exchange tube and welding joint; the tube sheet is provided with tube holes; The heat exchange tube is connected to the tube sheet by passing through the tube hole; the heat exchange tube and the tube sheet are welded to form the welded joint; the base layer and the corrosion-resistant layer are stacked and arranged at the pit of the tube sheet.

2. A heat exchanger tube sheet repair device according to claim 1, characterized in that: The thickness of the base layer is 8-12 mm.

3. The heat exchanger tube sheet repair device according to claim 1, characterized in that: The thickness of the corrosion-resistant plate is 12-20 mm.

4. A heat exchanger tube sheet repair device according to claim 1, characterized in that: The corrosion-resistant layer plate is made of the same material as the heat exchanger tube.

5. The heat exchanger tube sheet repair device according to claim 1, characterized in that: A corrosion-resistant layer plate is arranged on the outermost side of the base layer plate.

6. The heat exchanger tube sheet repair device according to claim 1, characterized in that: The welded joint is a fillet weld.

7. The heat exchanger tube sheet repair device according to claim 1, characterized in that: A T-shaped step is provided between the base layer plate and the corrosion-resistant layer plate; the T-shaped step is the gap between the layer plate and the tube plate.

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