A heat exchanger

Abstract

The utility model belongs to heat exchange equipment technical field, concretely relates to a heat exchanger. The heat exchanger includes: the casing, the integrated double tube plate of removable mode is arranged in the left end part of casing, the pipe box of welding mode is arranged in the left end part of integrated double tube plate, the U-shaped heat exchange pipe of setting in the casing, both ends of U-shaped heat exchange pipe all pass through integrated double tube plate and are connected with the inner chamber of pipe box.

Description

Technical Field

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

[0002] Dual tube sheet heat exchangers play an important role in the oil and petrochemical industry and are widely used in situations where the tube and shell-side media must not be mixed. This can prevent dangers such as explosions, corrosion, and abnormal reactions caused by the mixing of media on the tube and shell sides.

[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 and tube box are connected by bolts or other fasteners, and the tube sheet is welded to the shell. This type of fixed tube sheet double tube sheet heat exchanger has the following disadvantages: 1. Tube sheets are on both sides of the heat exchange tubes, resulting in high material costs; 2. Tube installation requires blind installation, demanding high processing precision and making assembly difficult; 3. The tube sheet is welded to the shell side, making it impossible to mechanically clean or monitor the corrosion of the heat exchange tubes on the shell side; 4. It is not suitable for high-pressure media conditions. When high-pressure media flow through the shell side, the shell wall thickness is large, resulting in high material costs. Therefore, it is generally preferred that high-pressure media flow through the tube side. In fixed tube sheet heat exchangers, the tube sheet and tube box are connected by bolts, which is prone to leakage and is not suitable for high-pressure conditions. Utility Model Content

[0004] In view of the technical problems mentioned above, the present invention aims to provide a heat exchanger that can solve at least one of the above technical problems.

[0005] According to this utility model, a heat exchanger is provided, comprising:

[0006] case;

[0007] An integral double-tube sheet that is detachably mounted on the left end of the housing;

[0008] The tube box is installed at the left end of the integral double tube sheet by welding.

[0009] The U-shaped heat exchange tubes are installed inside the housing, with both ends of the U-shaped heat exchange tubes passing through the integral double tube sheet and connecting to the inner cavity of the tube box.

[0010] In one specific embodiment, the pipe box includes a pipe box body and a spherical end cap that are coaxially connected to each other, and a manhole is provided on the side wall of the pipe box body or the spherical end cap.

[0011] In one specific embodiment, a partition plate is provided inside the tube box to divide the inner cavity of the tube box into upper and lower chambers. An inlet and an outlet are provided on the outer wall of the tube box to connect the two chambers respectively. The two ends of the U-shaped heat exchange tube are respectively connected to the two chambers of the tube box.

[0012] In one specific embodiment, the partition plate is provided with a channel hole that connects the two chambers of the tube box, and the partition plate is provided with a channel plate that can close the channel hole.

[0013] In one specific embodiment, the channel plate is located on the side of the partition plate closest to the manhole.

[0014] In one specific embodiment, a handle is provided on the side of the channel plate near the manhole.

[0015] In one specific embodiment, the integral dual tube sheet includes a tube-side tube sheet and a shell-side tube sheet arranged coaxially with each other. The tube-side tube sheet is coaxially fixedly connected to the right port of the tube box by welding, and the shell-side tube sheet is coaxially fixedly connected to the left port of the shell by flange connection.

[0016] In one specific embodiment, an isolation cavity is provided between the tube-side tube sheet and the shell-side tube sheet.

[0017] In one specific embodiment, a vent is provided inside the tube-side tube sheet, one end of which is connected to the isolation cavity, and the other end extends to the upper outer side of the tube-side tube sheet.

[0018] In one specific embodiment, a drain port is provided inside the tube-side tube sheet. One end of the drain port is connected to the isolation cavity, and the other end extends to the lower outer side of the tube-side tube sheet. A plug is provided inside the drain port.

[0019] Compared with the prior art, the advantages of this application are as follows.

[0020] The shell and the integral double tube sheet of this utility model are connected in a detachable manner. The two can be disassembled for easy mechanical cleaning, which can effectively prevent scale buildup inside the shell, reduce heat exchange efficiency, avoid under-deposit corrosion on the outer surface of the heat exchange tubes, and meet the requirements of long-term operation.

[0021] The tube box and the integral double tube sheet of this utility model are connected by welding, which makes it less prone to leakage and suitable for high-pressure conditions.

[0022] Manholes are provided on the pipe box, and passage holes are provided on the partition plates to facilitate the inspection and maintenance of the pipe box.

[0023] 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 heat exchange tubes and increases the heat transfer area.

[0024] The heat exchange tubes are specifically U-shaped. During the assembly process, the U-shaped heat exchange tubes are inserted into the integral double tube sheet, and then the integral double tube sheet is installed with the shell, making the assembly and processing less difficult.

[0025] The U-shaped heat exchange tube only needs to be fixedly connected to the two ends of the integral double tube sheet. The rest of the part located inside the shell can be equipped with support to prevent tilting. No fixed connection is required. Therefore, the U-shaped heat exchange tube can freely expand and contract and can be used in working conditions with large temperature differences between the tube and shell.

[0026] The integrated double tube sheet is equipped with a vent and a drain port to facilitate the observation of leaks at the connection between the tube sheet and the heat exchange tubes. Attached Figure Description

[0027] The present invention will now be described with reference to the accompanying drawings.

[0028] Figure 1 A schematic diagram of one embodiment of a heat exchanger according to the present invention is shown;

[0029] Figure 2 A schematic diagram of one embodiment of the tube box according to the present invention is shown;

[0030] Figure 3 A schematic diagram of one embodiment of the integral double tube sheet according to the present invention is shown;

[0031] Figure 4 A schematic diagram of one embodiment of the partition plate according to the present invention is shown;

[0032] Figure 5 The diagram shows a top view of the partition plate according to the present invention.

[0033] The reference numerals in the figure are as follows:

[0034] 1. Tube box; 2. U-shaped heat exchange tube; 3. Shell; 11. Spherical head; 12. Manhole; 13. Tube box body; 14. Inlet; 15. Integral double tube sheet; 16. Outlet; 17. Divider plate; 151. Tube-side tube sheet; 152. Vent port; 153. Shell-side tube sheet; 154. Plug; 155. Drain port; 156. Isolation chamber; 171. Channel hole; 172. Channel plate; 173. Handle; 100. Heat exchanger.

[0035] 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

[0036] The present invention will now be described with reference to the accompanying drawings.

[0037] 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.

[0038] Figure 1 The structure of the heat exchanger 100 according to this utility model is shown. For example... Figure 1 As shown, the heat exchanger 100 mainly includes a shell 3, an integral double tube sheet 15, a tube box 1, and U-shaped heat exchange tubes 2.

[0039] In this embodiment, the housing 3 is constructed as a cylindrical structure with an open left end and a closed right end along its axial direction. The integral double tube plate 15 is detachably and coaxially fixed to the left end of the housing 3, thereby sealing the left end opening of the housing 3. The tube box 1 is constructed as a cylindrical structure with a closed left end and an open right end along its axial direction. The right end of the tube box 1 is coaxially and fixedly connected to the left end of the integral double tube plate 15 by welding, thereby sealing the right end opening of the tube box 1.

[0040] The U-shaped heat exchange tube 2 has an overall U-shaped structure and is installed inside the shell 3. The two ends of the U-shaped heat exchange tube 2 face to the left and pass through the integral double tube sheet 15, thereby connecting with the inner cavity of the tube box 1.

[0041] In one specific embodiment, the tube box 1 includes a tube box body 13 and a spherical end cap 11, which is coaxially connected to the left end of the tube box body 13. The right end opening of the tube box body 13 is coaxially fixedly connected to the integral double tube sheet 15 by welding. A manhole 12 is provided on the side wall of the tube box body 13 or the spherical end cap 11. Since the tube box 1 is fixedly connected to the integral double tube sheet 15 by welding, the manhole 12 allows personnel to easily enter the tube box 1 to maintain and clean its interior.

[0042] Preferably, the manhole 12 is located on the spherical head 11, with a nominal diameter of not less than DN500. The spherical head 11 has good stress distribution and a thinner wall thickness than other convex heads of the same diameter, saving material. The manhole 12 on the spherical head 11 facilitates the inspection and maintenance of the pipe box 1, eliminates the need for flanges, and improves the pressure resistance of the pipe box 1.

[0043] 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 spherical end cap 11, the tube box body 13, and the integral double tube sheet 15. An inlet 14 and an outlet 16 are provided on the outer wall of the tube box body 13, respectively connecting the two chambers. The two ends of the U-shaped heat exchange tube 2 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 2. During the flow of the first medium along the U-shaped heat exchange tube 2, it exchanges heat with the second medium in the inner cavity of the shell 3. Finally, the first medium enters the lower cavity of the tube box 1 through the U-shaped heat exchange tube 2 and is discharged through the outlet 16.

[0044] Preferably, the U-shaped heat exchange tube 2 is connected to the shell-side tube sheet 153 by strength expansion, and to the tube-side tube sheet 151 by strength welding and bonding expansion.

[0045] Preferably, the partition plate 17 is continuously welded to the spherical head 11, the tube box body 13, and the integral double tube sheet 15 on both sides, with the weld radius equal to 3 / 4 times the thickness of the partition plate 17. The partition plate 17 is welded to the tube box 1, resulting in a simple structure and convenient manufacturing. The partition plate 17 is fixed on all four sides, not easily deformed, and has strong pressure resistance.

[0046] In this embodiment, the tube box 1 and the integral double tube sheet 15 are connected by welding, which can prevent leakage and is suitable for high-pressure conditions. The integral double tube sheet 15 is detachable from the shell 3, which facilitates mechanical cleaning and inspection of scaling and corrosion on the outer surface of the U-shaped heat exchange tube 2. The heat exchange tube is U-shaped, with both ends of the U-shaped heat exchange tube 2 located on the left end. The integral double tube sheet 15 only needs to be installed on the left end of the U-shaped heat exchange tube 2, saving materials and reducing the difficulty of tube insertion and assembly.

[0047] In one specific embodiment, the spherical end cap 11, manhole 12, tube box body 13, inlet 14, outlet 16, partition plate 17, and integral double tube plate 15 are all fixedly connected by welding.

[0048] In a specific embodiment, such as Figure 2 , Figure 4 and Figure 5As shown, the partition plate 17 has a channel hole 171 that connects the two chambers of the pipe box 13, and a channel plate 172 that closes the channel hole 171. With this configuration, when cleaning the inner cavity of the pipe box 1, the operator first enters the upper cavity of the pipe box 1 through the manhole 12, then removes the channel plate 172 from the channel hole 171 and enters the lower cavity of the pipe box 1 through the channel hole 171. Furthermore, the channel hole 171 facilitates continuous welding of both sides of the partition plate 17, and during the pipe joint pressure test, leakage can be observed through the channel hole 171.

[0049] In one specific embodiment, the channel plate 172 is located on the side of the partition plate 17 near the manhole 12 and is fixed to the partition plate 17 by bolts, sealing the channel hole 171. A handle 173 is provided on the side of the channel plate 172 near the manhole 12. This arrangement facilitates manual removal of the channel plate 172 from the channel hole 171.

[0050] In a specific embodiment, such as Figure 3 As shown, the integral double tube sheet 15 includes a tube-side tube sheet 151 and a shell-side tube sheet 153 coaxially arranged. The right end of the tube-side tube sheet 151 and the left end of the shell-side tube sheet 153 are fixedly connected by welding. Figure 1 As shown, the left end of the tube-side tube sheet 151 is coaxially and sealed to the right port of the tube box 1 by welding, and the right end of the shell-side tube sheet 153 is coaxially and fixedly connected to the left port of the shell 3 by flange connection.

[0051] In one specific embodiment, the edge extension of the shell-side tube sheet 153 is configured as a flange, which is connected to the shell 3 by fasteners such as bolts, nuts and gaskets.

[0052] In a specific embodiment, such as Figure 3 As shown, an isolation cavity 156 is provided between the tube-side tube sheet 151 and the shell-side tube sheet 153.

[0053] In this embodiment, the tube-side tube sheet 151 is recessed inward along the axial direction to form an isolation cavity 156, the axial length of which is 10 mm. By controlling the axial length of the isolation cavity 156, the concentricity and parallelism of the tube holes in the integral double tube sheet 15 can be easily ensured, reducing the difficulty of tube insertion. In addition, the portion of the U-shaped heat exchange tube 2 located inside the integral double tube sheet 15 cannot participate in heat exchange. The small axial length of the isolation cavity 156 of the integral double tube sheet 15 reduces the length of ineffective heat exchange tubes and increases the heat exchange area. The integral welded structure between the tube-side tube sheet 151 and the shell-side tube sheet 153 is compact, and the two constrain each other, enhancing the rigidity of the integral double tube sheet 15 and improving its pressure-bearing capacity.

[0054] A vent 152 is provided inside the tube-side tube sheet 151. One end of the vent 152 is connected to the upper part of the isolation chamber 156, and the other end extends to the upper outer side of the tube-side tube sheet 151, thereby enabling the isolation chamber 156 to communicate with the outside. A plug 154 is provided inside the vent 152.

[0055] A drain port 155 is provided inside the tube-side tube sheet 151. One end of the drain port 155 is connected to the lower part of the isolation chamber 156, and the other end extends to the lower outer side of the tube-side tube sheet 151, thereby enabling the isolation chamber 156 to communicate with the outside. A plug 154 is provided inside the drain port 155.

[0056] During pipe joint pressure testing and routine equipment operation, leakage can be observed through the vent port 152 and drain port 155. When leakage observation is not required, the joint can be sealed using the plug 154.

[0057] In this embodiment, the vent 152 and the drain 155 consist of two parts, one axial and one radial. The axial portion of the vent 152 and the drain 155 is a smooth hole, connected to the isolation cavity 156. The radial portion of the vent 152 and the drain 155 has a threaded hole near the edge of the tube-side plate 151 for connecting the plug 154; the remainder is a smooth hole. The diameter of the smooth hole in the radial portion is Φ12mm, and the diameter of the threaded hole is M12 with a length of 24mm.

[0058] Preferably, the integral double tube sheet 15 is a forging, and the plug 154 is made of stainless steel. Forgings are isotropic, facilitating high-precision machining and reducing the assembly difficulty of the double tube sheet heat exchanger. The plug 154, made of stainless steel, is corrosion-resistant and easy to disassemble.

[0059] 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.

[0060] 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.

[0061] 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.

[0062] 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 heat exchanger, characterized in that, include: Shell (3); An integral double tube plate (15) is detachably mounted on the left end of the housing (3); The tube box (1) is installed at the left end of the integral double tube sheet (15) by welding; and The U-shaped heat exchange tube (2) is installed inside the housing (3). Both ends of the U-shaped heat exchange tube (2) pass through the integral double tube sheet (15) and are connected to the inner cavity of the tube box (1).

2. The heat exchanger according to claim 1, characterized in that, The pipe box (1) includes a pipe box cylinder (13) and a spherical end cap (11) that are coaxially connected to each other, and a manhole (12) is provided on the side wall of the pipe box cylinder (13) or the spherical end cap (11).

3. The heat exchanger according to claim 2, characterized in that, A partition plate (17) is provided inside the tube box (1) to divide the inner cavity of the tube box (1) into two chambers, an upper and a lower chamber. An inlet (14) and an outlet (16) are provided on the outer wall of the tube box (1) to connect the two chambers respectively. The two ends of the U-shaped heat exchange tube (2) are connected to the two chambers of the tube box (1) respectively.

4. The heat exchanger according to claim 3, characterized in that, The partition plate (17) is provided with a channel hole (171) that connects the two chambers of the tube box (1), and the partition plate (172) is provided with a channel plate (172) that can close the channel hole (171).

5. The heat exchanger according to claim 4, characterized in that, The channel plate (172) is located on the side of the partition plate (17) near the manhole (12).

6. The heat exchanger according to claim 5, characterized in that, A handle (173) is provided on the side of the channel plate (172) near the manhole (12).

7. The heat exchanger according to any one of claims 1 to 6, characterized in that, The integral double tube sheet (15) includes a tube-side tube sheet (151) and a shell-side tube sheet (153) arranged coaxially with each other. The tube-side tube sheet (151) is coaxially fixedly connected to the right port of the tube box (1) by welding, and the shell-side tube sheet (153) is coaxially fixedly connected to the left port of the shell (3) by flange connection.

8. The heat exchanger according to claim 7, characterized in that, An isolation cavity (156) is provided between the tube-side tube sheet (151) and the shell-side tube sheet (153).

9. The heat exchanger according to claim 8, characterized in that, A vent (152) is provided inside the tube-side tube sheet (151). One end of the vent (152) is connected to the isolation cavity (156), and the other end extends to the upper outer side of the tube-side tube sheet (151).

10. The heat exchanger according to claim 8, characterized in that, A drain port (155) is provided inside the tube side plate (151). One end of the drain port (155) is connected to the isolation chamber (156), and the other end extends to the lower outer side of the tube side plate (151). A plug (154) is provided inside the drain port (155).

Images