A spiral wound heat exchanger

Abstract

The utility model provides a kind of wound pipe heat exchanger, comprising: vertically arranged shell side cylinder, the central part of the first end of which is equipped with shell side connector;Center cylinder, which is arranged in the shell side cylinder along the axial direction;Multiple heat exchange tubes, which are arranged in the shell side cylinder along the axial direction and are spirally wound on the outer periphery of the center cylinder from inside to outside;Tube sheet and tube box, and the tube box is equipped with tube side connector;The tube sheet is transversely arranged in the shell side cylinder and the outer periphery of the center cylinder, and is relatively close to the first end of the shell side cylinder, and the tube sheet has a first surface facing the first end of the shell side cylinder and a second surface opposite to the first surface, and the second surface is arranged corresponding to the axial end of each heat exchange tube to support the end of each heat exchange tube;At least part of the tube box is located in the outer periphery of the center cylinder in the shell side cylinder, and is arranged on the side of the first surface of the tube sheet and is connected with the end of the heat exchange tube supported on the tube sheet;The tube side connector is located on the first end of the shell side cylinder, avoiding the shell side connector.

Description

Technical Field

[0001] This utility model belongs to the field of heat exchanger technology, specifically relating to a wound tube heat exchanger. Background Technology

[0002] For heat exchangers, when fluid flows laterally across the heat exchange tube bundle, it can easily cause vibration or even damage to the heat exchanger. Therefore, effectively avoiding flow-induced vibration of the tube bundle is crucial for the safe operation of the heat exchanger.

[0003] Spiral tube heat exchangers also suffer from similar tube bundle flow-induced vibration problems. For example, Chinese invention patent No. 202211348469.5, "A Heat Exchanger and a Polycrystalline Silicon Production System Using the Heat Exchanger" (authorization announcement No. CN115628628B), describes a spiral tube bundle in a spiral tube heat exchanger with helical and outgoing sections, based on its structural characteristics. While the helical section can mitigate flow-induced vibration through the proper arrangement of spacers, the outgoing section is more difficult to fix effectively due to its complex arrangement, especially for side tube sheet structures. In these structures, the tube sheet is arranged parallel to the shell-side wall, and the heat exchange tubes, after winding out from the core, bend and then horizontally enter the side tube sheet. This results in a large unsupported span in the outgoing section, and the bending of the outgoing section significantly reduces the natural frequency of the tube bundle, thus increasing the risk of flow-induced vibration. This risk is particularly high as heat exchanger equipment becomes larger. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a wound tube heat exchanger that can reduce the risk of flow-induced vibration in tube bundles, based on the current state of the technology.

[0005] The technical solution adopted by this utility model to solve the above-mentioned technical problems is: a wound tube heat exchanger, comprising:

[0006] The shell-side cylinder is arranged vertically, and a shell-side nozzle for the shell-side medium to pass through is provided at the center of the first axial end.

[0007] The central cylinder is disposed axially within the shell-side cylinder;

[0008] Multiple heat exchange tubes are arranged axially inside the shell-side cylinder and spirally wound from the inside out around the outer circumference of the central cylinder to form a multi-layer spiral tube.

[0009] Tube sheet and tube box, wherein the tube box is provided with a tube-side connector for the passage of tube-side medium;

[0010] Its features are:

[0011] The tube sheet is placed horizontally inside the shell-side cylinder, around the periphery of the central cylinder, and relatively close to the first end of the shell-side cylinder. The tube sheet has a first plate surface facing the first end of the shell-side cylinder and a second plate surface opposite to the first plate surface. The second plate surface is arranged corresponding to the axial ends of each heat exchange tube so that the ends of each heat exchange tube can be supported thereon.

[0012] At least a portion of the tube box is located inside the shell-side cylinder, outside the central cylinder, and is disposed on the side of the first plate surface of the tube sheet, communicating with the end of the heat exchange tube supported on the tube sheet; the tube-side nozzle is located on the first end of the shell-side cylinder, avoiding the shell-side nozzle.

[0013] Because the tube sheet is built into the shell-side cylinder, and the first plate surface of the tube sheet faces the first end of the shell-side cylinder, while the second plate surface of the tube sheet is arranged corresponding to the axial ends of each heat exchange tube, the ends of the heat exchange tubes can be inserted into the tube sheet axially and supported on the tube sheet. This reduces the unsupported span of the heat exchange tubes and avoids excessive bending of the heat exchange tubes, thus improving the vibration resistance of the heat exchange tube bundle. Furthermore, in this invention, since the shell-side nozzle is located at the first end of the shell-side cylinder, the shell-side medium entering and exiting the shell-side cylinder through the shell-side nozzle flows axially through the heat exchange tube bundle, which can reduce the risk of flow-induced vibration of the tube bundle.

[0014] The number of tube sheets depends on the number and arrangement of heat exchange tubes and the space inside the shell-side shell. Preferably, there are at least two tube sheets, which are arranged circumferentially around the periphery of the central shell. The number of tube boxes is the same as the number of tube sheets, and each tube box is set corresponding to its respective tube sheet. The tube-side nozzles on each tube box are arranged circumferentially around the outer periphery of the shell-side nozzles.

[0015] Preferably, the tube sheet is annular and surrounds the periphery of the central cylinder in the circumferential direction; correspondingly, the tube box is also annular.

[0016] The number of pipe-side connectors depends on the resistance drop of the pipe-side medium flow; the more pipe-side connectors, the lower the local resistance. Furthermore, there are at least two pipe-side connectors, arranged circumferentially at intervals on the pipe box, surrounding the shell-side connectors.

[0017] To improve the overall structural stability, preferably, the tube sheet and the central cylinder are connected by radially extending ribs. Of course, the tube sheet can also be connected to the shell-side cylinder by ribs.

[0018] Preferably, the end of the central cylinder is spaced opposite to the shell-side nozzle.

[0019] In the above embodiments, preferably, along the axial direction, each layer of spiral tube has a spiral segment wound around the outer periphery of the central cylinder, a straight tube segment extending axially from the end of the spiral segment, and the end of the straight tube segment is supported on the tube sheet.

[0020] For ease of maintenance and cleaning, preferably, the passage in the shell-side connector is a passage for maintenance personnel to enter and exit; and / or, the passage in the tube-side connector is a passage for maintenance personnel to enter and exit.

[0021] Compared with the prior art, the advantages of this utility model are as follows: Since the tube sheet is built into the shell-side cylinder, and the first plate surface of the tube sheet faces the first end of the shell-side cylinder, and the second plate surface of the tube sheet is arranged corresponding to the axial ends of each heat exchange tube, the ends of the heat exchange tubes can be inserted into the tube sheet axially and supported on the tube sheet, reducing the unsupported span of the heat exchange tubes and eliminating excessive bends in the heat exchange tubes, thus improving the vibration resistance of the heat exchange tube bundle; In addition, since the shell-side nozzle is located at the first end of the shell-side cylinder, the shell-side medium entering and exiting the shell-side cylinder through the shell-side nozzle flows axially through the heat exchange tube bundle, which can reduce the risk of flow-induced vibration of the tube bundle. Attached Figure Description

[0022] Figure 1 This is a partial structural schematic diagram of Embodiment 1 of the present utility model;

[0023] Figure 2 for Figure 1 Sectional view along the middle AA direction;

[0024] Figure 3 This is a partial structural schematic diagram of Embodiment 2 of the present invention;

[0025] Figure 4 for Figure 3 Sectional view along the BB direction. Detailed Implementation

[0026] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0027] Example 1:

[0028] like Figure 1 , 2 As shown, this is a preferred embodiment of a wound tube heat exchanger of the present invention. The wound tube heat exchanger includes a shell-side cylinder 1, a central cylinder 2, heat exchange tubes 3, a tube sheet 4, and a tube box 5.

[0029] The shell-side cylinder 1 is vertically arranged, and a shell-side connector 11 for the shell-side medium to enter is provided at the center of its lower first end. The passage inside the shell-side connector 11 is a passage for maintenance personnel to enter and exit, so as to facilitate the entry and exit of maintenance personnel.

[0030] The central cylinder 2 is axially disposed inside the shell-side cylinder 1, and the lower end of the central cylinder 2 is spaced apart from the shell-side nozzle 11.

[0031] Multiple heat exchange tubes 3 are arranged axially inside the shell-side cylinder 1 and spirally wound around the outer circumference of the central cylinder 2 from the inside out to form a multi-layer spiral tube. Along the axial direction, each layer of spiral tube has a spiral section 31 wound around the outer circumference of the central cylinder 2 and a straight tube section 32 extending axially from the end of the spiral section 31.

[0032] The tube sheet 4 is horizontally placed inside the shell-side cylinder 1, around the periphery of the central cylinder 2, and relatively close to the first end of the shell-side cylinder 1. The tube sheet 4 has a downward-facing first plate surface 41 and an upward-facing second plate surface 42. The second plate surface 42 is arranged corresponding to the lower end of each heat exchange tube 3 (i.e., the lower end of the straight tube section 32 located below the spiral section 31) to support the lower end of each heat exchange tube 3. The tube box 5 is located inside the shell-side cylinder 1, around the periphery of the central cylinder 2, and is located below the first plate surface 41 of the tube sheet 4. It is constrained to the tube sheet 4 by welding and is connected to the lower end of the heat exchange tube 3 supported on the tube sheet 4. The tube box 5 is provided with a tube-side connector 51 for tube-side medium output. The tube-side connector 51 is located at the first end of the shell-side cylinder 1, avoiding the shell-side connector 11. The channel inside the tube-side connector 51 is a passage for maintenance personnel to enter and exit, allowing maintenance personnel to enter the tube box 5 through the tube-side connector 51 to perform tube-side cleaning and maintenance.

[0033] In this embodiment, there are four tube sheets 4, which are arranged at equal intervals around the central cylinder 2 in the circumferential direction. Each tube sheet 4 is connected to the central cylinder 2 by radially extending ribs 6. The number of tube boxes 5 is the same as the number of tube sheets 4. Each tube box 5 is set corresponding to its respective tube sheet 4, and the tube-side nozzles 51 on each tube box 5 are arranged at equal intervals around the outer periphery of the shell-side nozzles 11 in the circumferential direction.

[0034] Thus, in this embodiment, the lower end of the straight tube section 32 of the heat exchange tube can directly penetrate downward into the tube sheet 4 and be supported on the tube sheet 4, reducing the unsupported span of the heat exchange tube and eliminating excessive bends in the heat exchange tube, thereby improving the vibration resistance of the heat exchange tube bundle. Furthermore, during heat exchange, the shell-side medium enters the shell-side cylinder 1 through the shell-side nozzle 11. As the shell-side medium flows upward, it can flow axially through the heat exchange tube bundle, reducing the risk of flow-induced vibration in the tube bundle.

[0035] Meanwhile, this embodiment and the accompanying drawings only illustrate the structure of the lower half of the wound tube heat exchanger. This part of the structure can solve the technical problem of this utility model. As for the structure of the upper half of the wound tube heat exchanger, it can be referred to the design of the lower half or the design of the prior art, and will not be described in detail here.

[0036] Example 2:

[0037] like Figure 3 , 4The image shows a preferred embodiment of the spiral wound tube heat exchanger of this utility model. This embodiment is basically the same as the first embodiment, except that in this embodiment, there is one tube sheet 4, which is annular and surrounds the central cylinder 2 circumferentially. It is connected to the central cylinder 2 by four radially extending ribs 6, which are spaced apart circumferentially. Correspondingly, there is also one tube box 5 in this embodiment, which is annularly extending circumferentially. There are four tube-side connecting pipes 51 on the tube box 5, which are spaced apart circumferentially on the tube box 5 and surrounding the shell-side connecting pipes 11.

[0038] In the specification and claims of this utility model, terms indicating direction, such as "upper," "lower," "side," "top," and "bottom," are used to describe various exemplary structural parts and elements of this utility model. However, the use of these terms is merely for the purpose of explanation and is based on the exemplary orientations shown in the accompanying drawings. Since the embodiments disclosed in this utility model can be arranged in different orientations, these terms indicating direction are for illustrative purposes only and should not be regarded as limitations. For example, "upper" and "lower" are not necessarily limited to directions opposite to or consistent with the direction of gravity.

[0039] The term "vertical" is also used in the specification and claims of this utility model, meaning basically along the up and down direction, and is not limited to just the vertical direction, but can also be slightly deviated from the vertical direction.

[0040] The term "radial" is also used in the specification and claims of this utility model, meaning basically along the inside and outside direction, and is not limited to the radial direction that passes through the center of the circle, but can also be slightly deviated from the radial direction.

Claims

1. A wound tube heat exchanger, comprising: The shell-side cylinder (1) is arranged vertically, and a shell-side nozzle (11) for the shell-side medium to pass through is provided at the center of its first axial end. The central cylinder (2) is disposed axially inside the shell-side cylinder (1); Multiple heat exchange tubes (3) are arranged axially inside the shell-side cylinder (1) and spirally wound from the inside to the outside of the central cylinder (2) to form a multi-layer spiral tube; Tube sheet (4) and tube box (5), wherein the tube box (5) is provided with tube-side connector (51) for the tube-side medium to pass through; Its features are: The tube sheet (4) is placed horizontally inside the shell-side cylinder (1) and around the center cylinder (2), and is relatively close to the first end of the shell-side cylinder (1). The tube sheet (4) has a first plate surface (41) facing the first end of the shell-side cylinder (1) and a second plate surface (42) opposite to the first plate surface (41). The second plate surface (42) is arranged corresponding to the axial ends of each heat exchange tube (3) so that the ends of each heat exchange tube (3) can be supported on it. The tube box (5) is located at least partially inside the shell-side cylinder (1) and around the center cylinder (2), and is located on the side of the first plate surface (41) of the tube sheet (4) and connected to the end of the heat exchange tube (3) supported on the tube sheet (4); the tube-side nozzle (51) is located on the first end of the shell-side cylinder (1) away from the shell-side nozzle (11).

2. The wound tube heat exchanger according to claim 1, characterized in that: There are at least two tube sheets (4) and they are arranged circumferentially around the periphery of the central cylinder (2). The number of tube boxes (5) is the same as the number of tube sheets (4). Each tube box (5) is set corresponding to its respective tube sheet (4), and the tube side connector (51) on each tube box (5) is arranged circumferentially around the outer periphery of the shell side connector (11).

3. The wound tube heat exchanger according to claim 1, characterized in that: The tube sheet (4) is annular and surrounds the periphery of the central cylinder (2) in the circumferential direction. Correspondingly, the tube box (5) is also annular.

4. The wound tube heat exchanger according to claim 3, characterized in that: There are at least two tube-side connectors (51), which are arranged circumferentially on the tube box (5) and around the periphery of the shell-side connectors (11).

5. The wound tube heat exchanger according to claim 1, characterized in that: The tube sheet (4) and the central cylinder (2) are connected by radially extending ribs (6).

6. The wound tube heat exchanger according to claim 1, characterized in that: The end of the central cylinder (2) is spaced opposite to the shell-side nozzle (11).

7. The wound tube heat exchanger according to any one of claims 1 to 6, characterized in that: Along the axial direction, each layer of spiral tube has a spiral section (31) wound around the outer periphery of the central cylinder (2) and a straight tube section (32) extending axially from the end of the spiral section (31), with the end of the straight tube section (32) supported on the tube sheet (4).

8. The wound tube heat exchanger according to any one of claims 1 to 6, characterized in that: The passage within the shell-side connector (11) is a passage for maintenance personnel to enter and exit; and / or, the passage within the pipe-side connector (51) is a passage for maintenance personnel to enter and exit.

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