Detachable heat exchanger

Abstract

The utility model belongs to heat exchange equipment technical field, specifically, relate to a detachable heat exchanger. Detachable heat exchanger includes the pipe box, integral double tube plate and casing by detachable mode coaxial connection in proper order, be provided with U -shaped heat exchange pipe in casing, both ends of U -shaped heat exchange pipe all pass through integral double tube plate and with the inner chamber of pipe box is connected.

Description

Technical Field

[0001] This utility model belongs to the technical field of heat exchange equipment, specifically, it relates to a detachable heat exchanger. Background Technology

[0002] Double tube sheet heat exchangers hold an important position in the oil and petrochemical industry. Due to their special structure of two tube sheets, they are often used in situations where mixing of tube and shell media is strictly prohibited. However, their complex structure, high processing difficulty, and high manufacturing cost limit the promotion of double tube sheet heat exchangers in engineering projects.

[0003] Currently, the double tube sheet heat exchangers used in engineering are mainly fixed tube sheet heat exchangers. In this type of heat exchanger, the double tube sheet is connected to the tube box with bolts or other fasteners, and to the shell by welding. This makes it impossible to mechanically clean or monitor the corrosion of the heat exchange tubes on the shell side. During long-term operation, scaling of the medium on the shell side can lead to a decrease in heat exchange efficiency and even under-deposit corrosion, which is extremely detrimental to the long-term safe operation of the entire process system.

[0004] Fixed tubesheet heat exchangers have tubesheets at both axial ends of the heat exchange tubes, resulting in high material costs. During tube assembly, high concentricity between the heat exchange tubes and the tube holes on the tubesheet is required, and the tubes must be threaded blindly, further increasing costs and assembly complexity. Additionally, fixed tubesheet heat exchangers are unsuitable for applications with large shell-tube temperature differences, further limiting the market for double tubesheet heat exchangers. Utility Model Content

[0005] In view of the technical problems mentioned above, the present invention aims to provide a detachable heat exchanger that can solve at least one of the above technical problems.

[0006] According to the present invention, a detachable heat exchanger is provided, comprising a tube box, an integral double tube sheet and a shell connected coaxially in a detachable manner, wherein a U-shaped heat exchange tube is provided in the shell, and both ends of the U-shaped heat exchange tube pass through the integral double tube sheet and are connected to the inner cavity of the tube box.

[0007] In one specific embodiment, the tube box, the integral double tube sheet, and the housing are fixed to each other by means of flange connection.

[0008] In one specific embodiment, a first flange is provided on the outer wall of the tube box, a second flange is provided on the outer wall of the integral double tube sheet, and a third flange is provided on the outer wall of the shell. The first flange, the second flange, and the third flange are fixedly connected by fasteners.

[0009] In one specific embodiment, the fastener includes a bolt, a pipe nut, and a shell nut. The bolt passes through the first flange, the second flange, and the third flange in sequence. The pipe nut and the shell nut are respectively disposed at both ends of the bolt by means of threaded connection. The pipe nut abuts against the first flange, and the shell nut abuts against the third flange.

[0010] In one specific embodiment, a tube-side gasket is provided between the integral double tube sheet and the tube box, and a shell-side gasket is provided between the integral double tube sheet and the shell.

[0011] In one specific embodiment, the integral double tube sheet includes an outer tube sheet and an inner tube sheet that are coaxially arranged together by welding, and the second flange is disposed on the outer wall of the outer tube sheet.

[0012] In one specific embodiment, a boss is provided at one end of the outer tube sheet near the inner tube sheet, and a positioning step is provided at one end of the inner tube sheet near the outer tube sheet, the positioning step being adapted to the boss.

[0013] In one specific embodiment, the inner side of the positioning step is an isolation cavity.

[0014] In one specific embodiment, a vent and a drain are provided in the inner tube sheet. One end of the vent is connected to the isolation cavity, and the other end extends to the upper outer side of the outer tube sheet. One end of the drain is connected to the isolation cavity, and the other end extends to the lower outer side of the outer tube sheet. Plugs are provided in the vent and the drain.

[0015] In one specific embodiment, at least a portion of the U-shaped heat exchange tube is constructed as a corrugated tube.

[0016] Compared with the prior art, the advantages of this application are as follows.

[0017] The tube box, integral double tube sheet and shell of this utility model are connected to each other in a detachable manner. Both the tube box and the shell can be disassembled and mechanically cleaned to prevent scale buildup inside the heat exchanger, reduce heat exchange efficiency, avoid under-deposit corrosion, and meet the requirements of long-term operation.

[0018] The integral double tube sheet has a small isolation cavity and a short axial length, which greatly reduces the ineffective heat transfer length of the U-shaped heat exchange tubes and increases the heat transfer area.

[0019] U-tube heat exchangers only require an integral double tube sheet at one end. The U-tube heat exchanger is installed onto the integral double tube sheet before the shell is installed, making assembly and processing relatively simple.

[0020] U-shaped heat exchange tubes only need to be fixedly connected to the integral double tube sheet at one end, while the other end can be freely extended and retracted, so they can be used in working conditions with large temperature differences between the tube and shell sides.

[0021] At least part of the U-shaped heat exchange tube is corrugated, and in this invention, it is specifically constructed as a threaded tube. This can improve the turbulence of the medium inside the U-shaped heat exchange tube and increase the surface area of ​​the U-shaped heat exchange tube, thereby greatly improving the heat exchange efficiency.

[0022] The integrated double tube sheet is equipped with a vent and a drain port, which facilitates the observation of leakage at the connection between the tube sheet and the U-shaped heat exchange tube.

[0023] The outer and inner tube sheets of the integral double tube sheet are respectively provided with mutually compatible bosses and positioning steps, and the concave-convex surface assembly relationship simplifies the assembly process.

[0024] A second flange is provided on the outer wall of the outer tube sheet, which facilitates assembly and eliminates the need for a pressure testing fixture during pressure testing. Attached Figure Description

[0025] The present invention will now be described with reference to the accompanying drawings.

[0026] Figure 1 A schematic diagram of one embodiment of a detachable heat exchanger according to the present invention is shown;

[0027] Figure 2 An enlarged schematic diagram of the detachable portion of the detachable heat exchanger according to the present invention is shown.

[0028] Figure 3 A schematic diagram of one embodiment of the outer tube sheet according to the present invention is shown;

[0029] Figure 4 A schematic diagram of one embodiment of the inner tube plate according to the present invention is shown.

[0030] The reference numerals in the figure are as follows:

[0031] 1. Tube box; 2. Integral double tube sheet; 3. U-shaped heat exchange tubes; 4. Shell; 11. Tube-side gasket; 12. Bolt; 13. Tube-side nut; 14. Inlet; 15. First flange; 16. Outlet; 17. Divider plate; 21. Vent port; 22. Drain port; 23. Outer tube sheet; 24. Inner tube sheet; 231. Second flange; 232. Boss; 241. Plug; 242. Isolation chamber; 243. Axial aperture; 244. Positioning step; 245. Threaded hole; 246. Radial aperture; 31. Threaded groove; 41. Shell-side gasket; 42. Shell-side nut; 43. Third flange; 100. Removable heat exchanger.

[0032] In this application, all the accompanying drawings are schematic drawings, used only to illustrate the principle of the present invention, and are not drawn to scale. Detailed Implementation

[0033] The present invention will now be described with reference to the accompanying drawings.

[0034] It should be noted that the directional terms or qualifiers used in this application, such as "up," "down," "left," and "right," are all specific to the referenced material. Figure 1 In other words, they are not used to define the absolute position of the components involved, but can vary depending on the specific circumstances.

[0035] Figure 1 The structure of the detachable heat exchanger 100 according to this utility model is shown. For example... Figure 1 As shown, the detachable heat exchanger 100 mainly includes a shell 4, an integral double tube sheet 2, a tube box 1, and U-shaped heat exchange tubes 3.

[0036] In this embodiment, the housing 4 is constructed as a cylindrical structure with an open left end and a closed right end along the axial direction. The integral double tube plate 2 is detachably and coaxially fixed to the left end of the housing 4, thereby sealing the left end opening of the housing 4.

[0037] The tube box 1 is constructed as a cylindrical structure with the left end closed and the right end open along the axial direction. The right end of the tube box 1 is detachably and coaxially fixedly connected to the left end of the integral double tube sheet 2, thereby sealing the right end opening of the tube box 1.

[0038] The U-shaped heat exchange tube 3 has an overall U-shaped structure and is installed inside the shell 4. The two ends of the U-shaped heat exchange tube 3 face to the left and pass through the integral double tube sheet 2, thereby connecting with the inner cavity of the tube box 1.

[0039] In one specific embodiment, the tube box 1, the integral double tube sheet 2, and the shell 4 are fixed to each other by means of flange connection.

[0040] like Figure 1 and Figure 2 As shown, a first flange 15 is provided on the outer wall of the tube box 1, a second flange 231 is provided on the outer wall of the integral double tube sheet 2, and a third flange 43 is provided on the outer wall of the shell 4. The first flange 15, the second flange 231 and the third flange 43 are fixedly connected by fasteners, so that the tube box 1, the integral double tube sheet 2 and the shell 4 are coaxially and sealedly connected.

[0041] Furthermore, the fasteners include bolts 12, pipe-side nuts 13, and shell-side nuts 42. Bolts 12 pass sequentially through the first flange 15, the second flange 231, and the third flange 43. Pipe-side nuts 13 and shell-side nuts 42 are respectively installed at both ends of bolts 12 via threaded connections. Pipe-side nuts 13 abut against the first flange 15, and shell-side nuts 42 abut against the third flange 43. Bolts 12, pipe-side nuts 13, and shell-side nuts 42 can fix the first flange 15, the second flange 231, and the third flange 43 to each other, thereby coaxially and securely connecting the tube box 1, the integral double tube sheet 2, and the shell 4.

[0042] In one specific embodiment, a tube-side gasket 11 is provided between the contact surfaces of the integral double tube sheet 2 and the tube box 1, and a shell-side gasket 41 is provided between the contact surfaces of the integral double tube sheet 2 and the housing 4. By providing the tube-side gasket 11 and the shell-side gasket 41, the sealing performance between the tube box 1, the integral double tube sheet 2, and the housing 4 can be enhanced.

[0043] In a specific embodiment, such as Figure 2 As shown, the integral double tube sheet 2 includes an outer tube sheet 23 and an inner tube sheet 24 arranged coaxially. The right end of the outer tube sheet 23 and the left end of the inner tube sheet 24 are fixedly connected by welding. The second flange 231 is integrally set on the outer wall of the outer tube sheet 23.

[0044] Traditional heat exchangers require pressure testing fixtures during pressure tests, but the presence of the second flange 231 eliminates the need for pressure testing fixtures, making it easier for the heat exchanger to be disassembled, assembled, and maintained daily.

[0045] like Figure 3 and Figure 4 As shown, a boss 232 is provided at the end of the outer tube sheet 23 near the inner tube sheet 24, and a positioning step 244 is provided at the end of the inner tube sheet 24 near the outer tube sheet 23. The positioning step 244 and the boss 232 are mutually adapted. Specifically, the inner diameter of the positioning step 244 is equal to the outer diameter of the boss 232. When the outer tube sheet 23 and the inner tube sheet 24 are assembled, the boss 232 can be inserted into the positioning step 244, and the outer wall of the boss 232 contacts the inner wall of the positioning step 244, thereby achieving positioning and facilitating assembly. Then, the boss 232 and the positioning step 244 are welded using a concave-convex surface welding bevel, thereby making the outer tube sheet 23 and the inner tube sheet 24 coaxially fixed and sealed.

[0046] Preferably, the U-shaped heat exchange tube 3 is connected to the inner tube sheet 24 by strength expansion, and to the outer tube sheet 23 by strength welding or strength welding plus expansion.

[0047] In a specific embodiment, such as Figure 3As shown, an isolation cavity 242 is provided between the outer tube sheet 23 and the inner tube sheet 24. Specifically, the inner side of the positioning step 244 is the isolation cavity 242.

[0048] In this embodiment, the axial length of the isolation cavity 242 is 10 mm. Controlling the axial length of the isolation cavity 242 facilitates ensuring the concentricity and parallelism of the tube holes on the integral double tube sheet 2, reducing the difficulty of tube insertion. In addition, since the U-shaped heat exchange tubes 3 inserted into the integral double tube sheet 2 cannot participate in heat exchange, the small axial length of the isolation cavity 242 can reduce the length of ineffective heat exchange tubes and increase the heat exchange area.

[0049] A vent 21 is provided inside the inner tube sheet 24. One end of the vent 21 is connected to the upper part of the isolation chamber 242, and the other end extends to the upper outer side of the inner tube sheet 24, thereby enabling the isolation chamber 242 to communicate with the outside. A plug 241 is provided inside the vent 21.

[0050] A drain port 22 is provided inside the inner tube sheet 24. One end of the drain port 22 is connected to the lower part of the isolation chamber 242, and the other end extends to the lower outer side of the inner tube sheet 24, thereby enabling the isolation chamber 242 to communicate with the outside. A plug 241 is provided inside the drain port 22.

[0051] During pipe joint pressure testing and routine equipment operation, leakage can be observed through the vent port 21 and drain port 22. When leakage observation is not required, the joint can be sealed using the plug 241.

[0052] In this embodiment, the vent 21 and the drain 22 are composed of two parts, one axial and one radial. The axial part of the vent 21 and the drain 22 is an axial aperture 243, which is connected to the isolation cavity 242. The radial part of the vent 21 and the drain 22 has a threaded hole 245 near the edge of the outer tube sheet 23 for connecting the plug 241, and the rest is a radial aperture 246.

[0053] In this embodiment, the diameters of the axial aperture 243 and the radial aperture 246 are Φ12mm. The threaded hole 245 has a diameter of M12 and a length of 24mm.

[0054] Preferably, the integral double tube sheet 2 is a forging, and the plug 241 is made of stainless steel. Forgings are isotropic, facilitating high-precision machining and reducing the assembly difficulty of the detachable double tube sheet heat exchanger. The plug 241, made of stainless steel, is corrosion-resistant and easy to disassemble.

[0055] In one specific embodiment, at least a portion of the U-shaped heat exchange tube 3 is constructed as a corrugated tube. For example... Figure 2 As shown, threads are provided on the outer wall of the U-shaped heat exchange tube 3 to form a bellows.

[0056] In this embodiment, the portion of the U-shaped heat exchange tube 3 near the port is a smooth tube. Starting 15mm from the inner tube sheet shell-side surface, a threaded groove 31 is formed on the outer wall of the U-shaped heat exchange tube 3. The depth of the threaded groove 31 is 0.2 times the thickness of the U-shaped heat exchange tube 3. The threaded groove 31 can reduce the laminar flow thickness, improve heat transfer efficiency, and reduce the equipment size under the same heat transfer requirements.

[0057] In one specific embodiment, a partition plate 17 is provided inside the tube box 1 to divide the inner cavity of the tube box 1 into upper and lower chambers. The partition plate 17 is horizontally disposed inside the tube box 1, and the edge of the partition plate 17 is sealed to the tube box 1 and the integral double tube sheet 2. An inlet 14 and an outlet 16 are provided on the outer wall of the tube box 1, respectively connecting the two chambers. The two ends of the U-shaped heat exchange tube 3 are respectively connected to the upper and lower chambers of the tube box 1. In this configuration, the first medium enters the upper cavity of the tube box 1 through the inlet 14, and then enters the U-shaped heat exchange tube 3. During the flow of the first medium along the U-shaped heat exchange tube 3, it exchanges heat with the second medium in the inner cavity of the shell 4. Finally, the first medium enters the lower cavity of the tube box 1 through the U-shaped heat exchange tube 3 and is discharged through the outlet 16.

[0058] In the description of this utility model, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0059] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0060] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0061] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and does not constitute any limitation on this utility model. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A detachable heat exchanger, characterized in that, It includes a tube box (1), an integral double tube sheet (2) and a shell (4) that are detachably coaxially connected in sequence. A U-shaped heat exchange tube (3) is provided in the shell (4). Both ends of the U-shaped heat exchange tube (3) pass through the integral double tube sheet (2) and are connected to the inner cavity of the tube box (1).

2. The detachable heat exchanger according to claim 1, characterized in that, The tube box (1), the integral double tube sheet (2), and the shell (4) are fixed to each other by means of flange connection.

3. The detachable heat exchanger according to claim 2, characterized in that, A first flange (15) is provided on the outer wall of the tube box (1), a second flange (231) is provided on the outer wall of the integral double tube sheet (2), and a third flange (43) is provided on the outer wall of the shell (4). The first flange (15), the second flange (231) and the third flange (43) are fixedly connected by fasteners.

4. The detachable heat exchanger according to claim 3, characterized in that, The fasteners include a bolt (12), a pipe nut (13), and a shell nut (42). The bolt (12) passes through the first flange (15), the second flange (231), and the third flange (43) in sequence. The pipe nut (13) and the shell nut (42) are respectively provided at both ends of the bolt (12) by means of threaded connection. The pipe nut (13) abuts against the first flange (15), and the shell nut (42) abuts against the third flange (43).

5. The detachable heat exchanger according to claim 3, characterized in that, A tube-side gasket (11) is provided between the integral double tube sheet (2) and the tube box (1), and a shell-side gasket (41) is provided between the integral double tube sheet (2) and the shell (4).

6. The detachable heat exchanger according to any one of claims 3 to 5, characterized in that, The integral double tube sheet (2) includes an outer tube sheet (23) and an inner tube sheet (24) that are coaxially arranged by welding, and the second flange (231) is disposed on the outer wall of the outer tube sheet (23).

7. The detachable heat exchanger according to claim 6, characterized in that, A boss (232) is provided at one end of the outer tube sheet (23) near the inner tube sheet (24), and a positioning step (244) is provided at one end of the inner tube sheet (24) near the outer tube sheet (23). The positioning step (244) and the boss (232) are adapted to each other.

8. The detachable heat exchanger according to claim 7, characterized in that, The inner side of the positioning step (244) is an isolation cavity (242).

9. The detachable heat exchanger according to claim 8, characterized in that, An vent (21) and a drain (22) are provided inside the inner tube plate (24). One end of the vent (21) is connected to the isolation cavity (242), and the other end extends to the upper outer side of the outer tube sheet (23). One end of the drain port (22) is connected to the isolation chamber (242), and the other end extends to the lower outer side of the outer tube sheet (23). Plugs (241) are provided in the vent port (21) and the drain port (22).

10. The detachable heat exchanger according to any one of claims 1 to 5, characterized in that, At least a portion of the U-shaped heat exchange tube (3) is constructed as a corrugated tube.

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