Heat exchanger tube bundle structure convenient to detect

Abstract

The utility model relates to the technical field of petrochemical equipment, in particular to a heat exchanger tube bundle structure convenient to detect, which comprises a barrel, a front tube plate, a rear tube plate and a plurality of heat exchange tubes, the heat exchange tubes are parallelly arranged in the barrel at intervals, a plurality of baffle plates are fixed on the heat exchange tubes in a penetrating manner and are distributed at intervals along the length direction of the heat exchange tubes, and the front tube plate and the rear tube plate are fixed on the barrel. Connecting rods are arranged among the plurality of baffle plates, so that the baffle plates are fixed with one another; a gap is reserved between the periphery of each baffle plate and the inner wall of the cylinder body; the front tube plate and the rear tube plate are respectively provided with a plurality of tube holes, and the front end parts of the heat exchange tubes penetrate into the tube holes of the front tube plate and are welded and fixed; in the plurality of baffle plates, only the peripheral side of the baffle plate close to the rear tube plate is welded and fixed with the inner wall of the cylinder body; the rear end part of the heat exchange tube penetrates into a tube hole of the rear tube plate and is welded and fixed; and the front tube plate and the rear tube plate are respectively hermetically welded and fixed at two ports of the cylinder. Compared with the prior art, not only can the vibration problem be solved, but also the heat exchange tube can be conveniently moved.

Description

Technical Field

[0001] This utility model relates to the field of petrochemical equipment technology, specifically to a heat exchanger tube bundle structure that is easy to inspect. Background Technology

[0002] Heat exchangers are common chemical equipment. The tube bundle, as the core component of a heat exchanger, determines the overall quality of the heat exchanger, and the quality of the tube ends directly determines the quality of the tube bundle. Therefore, ensuring the quality of the tube ends is an important research topic. Current common methods include researching novel tube end structures and post-weld quality inspection of the tube ends.

[0003] For tube bundles requiring post-weld quality inspection of the tube ends, the heat exchange tubes need to be pulled out of the shell a certain distance. First, the ends of the heat exchange tubes are welded to the tube holes of the inlet tube sheet (front tube sheet). After this tube end welding is completed, non-destructive testing is performed. Once the weld is satisfactory, the front tube sheet and heat exchange tubes are pushed back into the shell, and then the tube ends of the heat exchange tubes are welded to the outlet tube sheet (rear tube sheet). This manufacturing process involves situations where the front tube sheet needs to be moved a certain distance after one end of the heat exchange tube is welded to it.

[0004] In this configuration, some deformation occurs after the front tube sheet is welded to the heat exchange tubes, and the size of the baffle orifice is fixed according to standards. When there is a sufficiently large gap between the baffle and the inner wall of the shell, the front tube sheet, heat exchange tubes, and baffle as a whole can be easily pushed back into the shell. However, the disadvantage of this structure is that a suitable gap is required between the baffle and the inner wall of the shell, the baffle is not connected to the shell, and the baffles are connected by tie rods. When the heat exchanger is in use, if there is a large flow rate or evaporation rate in the shell, the tube bundle will vibrate significantly, potentially causing tube head leakage and heat exchanger failure.

[0005] To address the above issues, it's necessary to reduce the gap between the baffle and the inner wall of the cylinder. Currently, this is achieved by adding a connecting plate to the inner wall of the cylinder to connect the baffle and the inner wall, effectively preventing the vibration generated by the baffle during operation from affecting the tube head. However, since the baffle is fixed in place, when the tube sheet and heat exchange tubes are pushed back into the cylinder after welding, welding deformation makes it increasingly difficult to push the heat exchange tubes into the cylinder. If the welding deformation is significant, the heat exchange tubes may become stuck and unable to be pushed into the cylinder. Therefore, this structure solves the baffle vibration problem but not the heat exchange tube movement problem. Thus, a new structure needs to be researched that can solve both the baffle vibration problem and the heat exchange tube movement problem. Summary of the Invention

[0006] In view of the above-mentioned technical problems, the present invention provides a heat exchanger tube bundle structure that is easy to inspect.

[0007] To achieve the above objectives, this utility model provides the following technical solution:

[0008] A heat exchanger tube bundle structure for easy inspection is provided, including a shell, a front tube sheet, a rear tube sheet, and multiple heat exchange tubes. The multiple heat exchange tubes are arranged side-by-side at intervals within the shell. Multiple baffles are fixedly inserted through the heat exchange tubes and are spaced apart along the length of the heat exchange tubes. Connecting rods are provided between the baffles to secure them to each other. The structure is characterized by: a gap between the periphery of the baffles and the inner wall of the shell; multiple tube holes on the front and rear tube sheets; the front ends of the heat exchange tubes passing through the tube holes in the front tube sheet and being welded and fixed; among the multiple baffles: only the baffles closest to the rear tube sheet are welded and fixed to the inner wall of the shell; the rear ends of the heat exchange tubes passing through the tube holes in the rear tube sheet and being welded and fixed; and the front and rear tube sheets are respectively sealed and welded to the two ends of the shell.

[0009] As a further alternative, the inner wall of the cylinder is provided with guide protrusions arranged circumferentially, and the outer side of the baffle is provided with guide grooves, with the guide protrusions slidably embedded in the guide grooves.

[0010] As a further alternative, multiple welding points are distributed circumferentially between the periphery of the baffle plate near the rear tube sheet and the inner wall of the cylinder.

[0011] As a further alternative, the baffles are arranged radially along the cylinder or inclined relative to the radial direction of the cylinder.

[0012] As a further alternative, the front tube sheet and / or the rear tube sheet are disc-shaped, comprising a central flat plate and peripheral arc plates.

[0013] As a further alternative, the thickness of the arc plate is greater than the thickness of the flat plate.

[0014] As a further alternative, the thickness of the arc plate gradually increases from the flat plate towards the cylindrical body.

[0015] As a further optional solution, a support is provided on the outer bottom of the cylinder.

[0016] The beneficial effects of this utility model are:

[0017] This invention discloses a heat exchanger tube bundle structure that facilitates inspection. During manufacturing, the shell and the front tube sheet are separated by a certain distance. First, the heat exchange tubes are pulled forward a certain distance, and then the ends of the heat exchange tubes are welded to the tube holes of the front tube sheet. After welding, non-destructive testing is performed. The welded front tube sheet and heat exchange tubes are moved towards the rear tube sheet. Once in place, the periphery of the baffle plate near the rear tube sheet is welded and fixed to the inner wall of the shell. The rear ends of the heat exchange tubes are inserted into the tube holes of the rear tube sheet and welded and fixed. Finally, the front and rear tube sheets are sealed and welded to fix the two ends of the shell.

[0018] Compared to existing technologies, the gap between the baffles and the inner wall of the cylinder facilitates the extraction of heat exchange tubes and post-weld inspection of the front tube sheet, as well as their easy insertion into the cylinder after welding. Furthermore, only the baffles closest to the rear tube sheet are welded to the inner wall of the cylinder, simplifying the welding process and ensuring the heat exchange tubes, baffles, and cylinder are mutually fixed, preventing excessive vibration during use. Therefore, this solution addresses both the vibration problem and the issue of facilitating heat exchange tube movement. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of a heat exchanger tube bundle structure that is easy to inspect, as shown in the embodiment.

[0020] Figure label:

[0021] 1. Shell body; 2. Front tube sheet; 3. Rear tube sheet; 4. Heat exchange tube; 5. Baffle plate; 6. Connecting rod; 7. Support. Detailed Implementation

[0022] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0023] This embodiment provides a heat exchanger tube bundle structure that is easy to inspect, such as... Figure 1 As shown, the system includes a cylinder 1, a front tube sheet 2, a rear tube sheet 3, and multiple heat exchange tubes 4. The heat exchange tubes 4 are arranged side-by-side at intervals within the cylinder 1. Multiple baffles 5 are fixedly installed through the heat exchange tubes 4, and these baffles 5 are spaced apart along the length of the heat exchange tubes 4. Connecting rods 6 are provided between the baffles 5 to secure them to each other. A gap is left between the periphery of each baffle 5 and the inner wall of the cylinder 1. The front tube sheet 2 and the rear tube sheet 3 each have multiple tube holes. The front end of each heat exchange tube 4 passes through a tube hole in the front tube sheet 2 and is welded and fixed. Of the multiple baffles 5, only one baffle 5 closest to the rear tube sheet 3 is welded and fixed to the inner wall of the cylinder 1, while the other baffles 5 are not fixed to the inner wall of the cylinder 1. The rear end of each heat exchange tube 4 passes through a tube hole in the rear tube sheet 3 and is welded and fixed. The front tube sheet 2 and the rear tube sheet 3 are respectively sealed and welded to the two ends of the cylinder 1.

[0024] During manufacturing, the cylinder 1 is positioned a distance away from the front tube sheet 2. The heat exchange tube 4 is first pulled forward a short distance, and then the end of the heat exchange tube 4 is welded to the tube hole of the front tube sheet 2. After welding, non-destructive testing is performed. The welded front tube sheet 2 and heat exchange tube 4 are then moved towards the rear tube sheet 3. Once in place, the baffle 5 near the rear tube sheet 3 is welded and fixed to the inner wall of the cylinder 1. The rear end of the heat exchange tube 4 is inserted into the tube hole of the rear tube sheet 3 and welded in place. Finally, the front tube sheet 2 and rear tube sheet 3 are sealed and welded to the two ends of the cylinder 1.

[0025] Specifically, the inner wall of the cylinder 1 is provided with guide protrusions arranged circumferentially (not shown in the figure, but a semi-circular strip structure can be used in practice), and the outer side of the baffle 5 is provided with guide grooves. The guide protrusions can be slidably embedded in the guide grooves, which facilitates the overall movement of the heat exchange tube 4 and the baffle 5 during the manufacturing process.

[0026] In practice, it is possible to have multiple welding points distributed circumferentially between the periphery of the baffle plate 5 near the rear tube sheet 3 and the inner wall of the cylinder 1.

[0027] In practice, it is possible to arrange each baffle 5 radially along the cylinder 1 or to arrange it radially inclined relative to the cylinder 1.

[0028] In this embodiment, the front tube sheet 2 and / or the rear tube sheet 3 are dish-shaped, comprising a central flat plate and peripheral arc-shaped plates. The thickness of the arc-shaped plates is greater than the thickness of the flat plate. The thickness of the arc-shaped plates gradually increases from the flat plate towards the cylinder 1, satisfying strength requirements while facilitating the absorption of thermal deformation.

[0029] In this embodiment, a support 7 is provided on the outer bottom of the cylinder 1 to support the entire cylinder 1.

[0030] In the description of this utility model, it is obvious that the described embodiments are only a part of the embodiments of this utility model, and not all of them. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0031] Therefore, the above detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0032] In the description of this utility model, it should be noted that the terms "middle," "upper," "lower," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0033] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "set," "connected," and "linked" 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, or a connection within two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

Claims

1. A heat exchanger tube bundle structure that is easy to inspect, comprising a shell (1), a front tube sheet (2), a rear tube sheet (3), and multiple heat exchange tubes (4), wherein the multiple heat exchange tubes (4) are arranged side by side at intervals in the shell (1), and multiple baffles (5) are fixed through the heat exchange tubes (4), the multiple baffles (5) are distributed at intervals along the length direction of the heat exchange tubes (4), and connecting rods (6) are provided between the multiple baffles (5) to achieve mutual fixation, characterized in that: A gap is left between the periphery of the baffle (5) and the inner wall of the cylinder (1); the front tube plate (2) and the rear tube plate (3) are respectively opened with multiple tube holes, and the front end of the heat exchange tube (4) is inserted into the tube hole of the front tube plate (2) and welded and fixed; among the multiple baffles (5): only the baffle (5) close to the rear tube plate (3) is welded and fixed to the inner wall of the cylinder (1); the rear end of the heat exchange tube (4) is inserted into the tube hole of the rear tube plate (3) and welded and fixed; the front tube plate (2) and the rear tube plate (3) are respectively sealed and welded to fix the two ends of the cylinder (1).

2. The heat exchanger tube bundle structure for easy inspection according to claim 1, characterized in that: The inner wall of the cylinder (1) is provided with guide protrusions arranged in the circumferential direction, and the outer side of the baffle (5) is provided with guide grooves, and the guide protrusions can be slidably embedded in the guide grooves.

3. The heat exchanger tube bundle structure for easy inspection according to claim 1, characterized in that: Multiple welding points are distributed circumferentially between the periphery of the baffle plate (5) near the rear tube sheet (3) and the inner wall of the cylinder (1).

4. The heat exchanger tube bundle structure for easy inspection according to claim 1, characterized in that: Each baffle plate (5) is arranged radially along the cylinder (1) or inclined relative to the radial direction of the cylinder (1).

5. A heat exchanger tube bundle structure that is easy to inspect according to claim 1, characterized in that: The front tube sheet (2) and / or the rear tube sheet (3) are disc-shaped, comprising a central flat plate and peripheral arc plates.

6. The heat exchanger tube bundle structure for easy inspection according to claim 5, characterized in that: The thickness of the curved plate is greater than that of the flat plate.

7. A heat exchanger tube bundle structure for easy inspection according to claim 6, characterized in that: The thickness of the arc plate gradually increases from the flat plate towards the cylinder (1).

8. A heat exchanger tube bundle structure that is easy to inspect according to claim 1, characterized in that: A support (7) is provided on the outer bottom of the cylinder (1).

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