Heat exchange core body and winding pipe type heat exchanger with heat exchange core body

Abstract

The invention discloses a heat exchange core body and a winding pipe type heat exchanger with the heat exchange core body. The heat exchange core body comprises a central cylinder, the plurality of heat exchange tubes are spirally wound on the periphery of the central cylinder along the axial direction; each heat exchange tube comprises an outer tube with an open head end and a closed tail end; the first end part of the inner tube is open, is inserted into the outer tube from the head end and is close to the tail end of the outer tube, and the second end part of the inner tube is open and is positioned outside the head end of the outer tube, so that a tube pass medium enters or flows out of the inner tube; the outer wall face of the inner pipe located in the outer pipe is opposite to the inner wall face of the corresponding outer pipe in a spaced mode to form an annular cavity extending in the length direction of the heat exchange pipe, a first port of the annular cavity corresponds to the tail end of the outer pipe and communicates with the first end of the inner pipe, and a second port of the annular cavity corresponds to the head end of the outer pipe. And the tube pass medium can pass through the heat exchanger. The heat exchange performance can be improved.

Description

Technical Field

[0001] This invention belongs to the field of heat exchanger technology, specifically relating to a heat exchange core and a wound tube heat exchanger having the heat exchange core. Background Technology

[0002] Existing wound tube heat exchangers generally have a shell-side cylinder and a heat exchange core located within the shell-side cylinder. The heat exchange tubes that make up the heat exchange core are hollow tubes that are spirally wound around the outer circumference of the central cylinder from the inside out. During heat exchange, the tube-side medium enters the heat exchange tube and flows in a columnar flow pattern within the heat exchange tube, exchanging heat with the shell-side medium inside the shell-side cylinder. Specific examples include the structures disclosed in Chinese Utility Model Patent Application No. CN201821799104.3, "A Winded Tube Heat Exchanger with Unequal Spacing" (Authorization Announcement No. CN209416108U); Chinese Utility Model Patent Application No. CN202422099714.4, "A Winded Tube Heat Exchanger" (Authorization Announcement No. CN223192145U); and Chinese Utility Model Patent Application No. CN202420748140.6, "Core Structure of Heat Exchanger, Winded Tube Heat Exchanger and EO / EG Device" (Authorization Announcement No. CN222747810U).

[0003] In the prior art, the tube-side medium flows in a columnar flow pattern inside the heat exchange tube. After the tube-side medium flowing near the tube wall exchanges heat with the shell-side medium outside the tube, it transfers the heat to the tube-side medium flowing away from the tube wall (such as the tube-side medium flowing in the center of the heat exchange tube cross-section). This heat transfer process results in high heat transfer resistance of the tube-side medium in the existing heat exchange tubes, and the heat transfer performance needs to be improved.

[0004] Meanwhile, for ease of cleaning and maintenance, the existing detachable spiral wound tube heat exchanger has the following structure:

[0005] 1. A fixed tube sheet is installed at one end of the heat exchange core along its length, and a floating tube sheet is installed at the other end. One end of the heat exchange tubes wound around the outer circumference of the central cylinder is supported by the fixed tube sheet, and the other end is supported by the floating tube sheet. During cleaning and maintenance, the fixed tube sheet, floating tube sheet, and the entire heat exchange core can be detached from the shell-side cylinder. Specifically, the structure is disclosed in Chinese Utility Model Patent Application No. CN201920654173.3, entitled "A Winding Tube Heat Exchanger" (Authorization Announcement No. CN209945069U).

[0006] Second, each heat exchange tube is spirally wound around the outer circumference of the central cylinder from the first end to the second end, and then folded back and spirally wound around the outer circumference of the central cylinder from the second end to the first end, so that each heat exchange tube is U-shaped as a whole, and both ends of the heat exchange tube are supported on the same tube sheet. Specifically, as in Chinese Utility Model Patent Application No. CN201920528053.9, "A Spiral-Wound Tube Capillary Heat Exchanger" (Authorization Announcement No. CN209857696U), the first tube box and the second tube box are simultaneously set on the first tube sheet, and both ends of the heat exchange tube are supported on the first tube sheet and connected to the first tube box and the second tube box respectively; the shell-side cylinder is detachably connected to the second tube sheet. Since both ends of each heat exchange tube are supported on the same tube sheet, and the area of ​​the tube sheet is limited, the number of heat exchange tubes is restricted, thus affecting the heat exchange efficiency of the heat exchanger. Summary of the Invention

[0007] The first technical problem to be solved by the present invention is to provide a heat exchange core that can improve heat exchange performance in light of the current state of the prior art.

[0008] The second technical problem to be solved by the present invention is to provide a wound tube heat exchanger having the above-mentioned heat exchange core.

[0009] The technical solution adopted by the present invention to solve the first technical problem mentioned above is: a heat exchange core, comprising:

[0010] Central tube;

[0011] Multiple heat exchange tubes are spirally wound around the outer circumference of the central cylinder along the axial direction;

[0012] Its characteristic is that each heat exchange tube includes:

[0013] The outer tube has an open head and a closed tail.

[0014] The inner tube has an open first end that is inserted into the outer tube from the aforementioned head end and adjacent to the tail end of the outer tube, and an open second end located outside the head end of the outer tube, so as to allow the tube-side medium to enter or flow out of the inner tube; the outer wall surface of the inner tube located inside the outer tube is spaced apart from the inner wall surface of the corresponding outer tube to form an annular cavity extending along the length direction of the heat exchange tube, the first port of the annular cavity corresponds to the tail end of the outer tube and communicates with the first end of the inner tube, and the second port of the annular cavity corresponds to the head end of the outer tube, so as to allow the tube-side medium to pass through.

[0015] In use, the tube-side medium can be introduced into the inner tube through the second end of the inner tube, and then sequentially enter the annular cavity between the outer tube and the inner tube through the first end of the inner tube and the first port of the annular cavity, and finally exit from the second port of the annular cavity. In this process, unlike the columnar flow pattern in existing heat exchange tubes, the tube-side medium is limited to flowing forward in the inner tube, but automatically becomes a thin-layer heat exchange structure after entering the annular cavity. The tube-side medium in the annular cavity can participate in the heat exchange of the shell-side medium outside the outer tube more directly and extensively through the tube wall of the outer tube, and there is no mutual flow between it and the tube-side medium in the inner tube. This can effectively reduce the heat exchange resistance of the tube-side medium in the annular cavity, thereby improving the heat exchange performance. Meanwhile, since the inlet and outlet of the tube medium (i.e., the second port of the annular cavity and the second end of the inner tube) of the present invention are located at the same end in the length direction of the heat exchange core, it is only necessary to set a tube sheet and a tube box for supporting the ends of the heat exchange tubes at the same end of the heat exchange core; and the shape of the heat exchange tubes wound around the central cylinder is the same as the core structure in the existing wound tube heat exchanger. The tube sheet can be opened with tube holes corresponding to the ends of each heat exchange tube. That is, by using such a heat exchange core, it is beneficial to make the heat exchanger into a detachable structure, which is convenient for future maintenance and installation.

[0016] Preferably, at least two positioning plates are circumferentially spaced protruding from the outer wall of the inner tube, located within the outer tube. Each positioning plate is located within the annular cavity and contacts the inner wall of the outer tube. The positioning plates serve a positioning function, maintaining the outer wall of the inner tube and the inner wall of the outer tube in a spaced-apart state, thus improving the overall stability of the heat exchange tube structure. Simultaneously, the positioning plates also act as turbulence devices, enhancing heat transfer.

[0017] Preferably, at least two positioning pieces arranged at intervals in the circumferential direction constitute a positioning piece group, and there are at least two positioning piece groups arranged at intervals along the extension direction of the annular cavity.

[0018] Furthermore, the positioning plates in adjacent positioning plate groups are staggered axially. This ensures stable force during support and enhances the rotational flow of the tube-side medium across the tube's cross-section.

[0019] In the above embodiments, preferably, at least a portion of the inner wall surface and / or outer wall surface of the inner tube located inside the outer tube is provided with a heat insulation layer to prevent heat transfer between the tube-side medium and the outer tube. The heat insulation layer can be a coating or a heat insulation sleeve fitted around the outer perimeter of the inner tube, etc.

[0020] The technical solution adopted by the present invention to solve the second technical problem mentioned above is: a wound tube heat exchanger, comprising:

[0021] The vertically arranged shell-side cylinder is equipped with a shell-side inlet pipe and a shell-side outlet pipe for the shell-side medium to pass through.

[0022] First tube sheet and second tube sheet;

[0023] The heat exchange core is vertically disposed within the shell-side cylinder.

[0024] Its features are:

[0025] The heat exchange core is the heat exchange core as described above;

[0026] The first tube sheet is located at the upper end of the shell-side cylinder and has a first tube hole for supporting the head end of the outer tube;

[0027] The second tube sheet is disposed on the upper side of the first tube sheet and forms an outlet tube box for the tube outlet connector between the two tube sheets. At the same time, the second tube sheet is provided with a second tube hole for supporting the second end of the inner tube.

[0028] An inlet tube box with a tube-side inlet connector is installed on the second tube sheet;

[0029] The first end of the outer tube is supported on the first tube sheet and connected to the outlet tube box through the first tube hole, and the second end of the inner tube is supported on the second tube sheet and connected to the inlet tube box through the second tube hole.

[0030] Preferably, the device further includes a distribution plate, horizontally positioned within the shell-side cylinder, corresponding to the tail end of the outer tube. The distribution plate has a central through-hole extending through the plate thickness, a first portion surrounding the central through-hole, and a second portion surrounding the first portion. The central through-hole allows the central tube to pass through. The first portion has a perforation for the tail end of the outer tube to pass through. The second portion has multiple flow equalization holes spaced circumferentially. The shell-side inlet pipe is located at the bottom of the shell-side cylinder, below the distribution plate, and the shell-side outlet pipe is located at the top of the shell-side cylinder. The design of the distribution plate reduces the risk of vibration at the tail end of the heat exchange tube due to the flow of the shell-side medium.

[0031] Preferably, multiple flow equalization holes distributed circumferentially are grouped into a set, with at least two sets, and arranged at intervals along the inside and outside directions. For two adjacent sets of flow equalization holes, the flow area of ​​the flow equalization hole located on the inside is smaller than the flow area of ​​the flow equalization hole located on the outside.

[0032] Preferably, the heat exchange core and the integral assembly consisting of the first tube sheet, the second tube sheet, the inlet tube box, and the outlet tube box are arranged to detach upwards from the shell-side cylinder. The heat exchange core structure of this invention allows the tube sheet and tube box to be positioned only on the upper side of the heat exchange core, leaving the lower side of the heat exchange core as a free side. This facilitates the upward detachment of the integral assembly consisting of the heat exchange core and the first tube sheet, the second tube sheet, the inlet tube box, and the outlet tube box from the shell-side cylinder, thereby simplifying cleaning and maintenance of the shell-side cylinder and the integral assembly. Furthermore, only corresponding tube holes for each heat exchange tube are needed on the tube sheet; that is, the number of heat exchange tubes matches the number of tube holes on the tube sheet, avoiding the limitation on the number of heat exchange tubes as in existing technologies. Additionally, the detachable nature of the wound tube heat exchanger can be achieved without the need for a floating tube sheet, as in existing technologies. Preferably, the integral assembly and the shell-side cylinder are connected by corresponding flanges.

[0033] Compared with existing technologies, the advantages of this invention are as follows: By designing each heat exchange tube to have an inner tube and an outer tube structure, during use, the tube-side medium can be introduced into the inner tube through the second end of the inner tube, and then sequentially enter the annular cavity between the inner and outer tubes through the first end of the inner tube and the first port of the annular cavity, and finally exit from the second port of the annular cavity. In this process, unlike the columnar flow pattern in existing heat exchange tubes, the tube-side medium in the inner tube is limited to flowing forward, while after entering the annular cavity, it automatically becomes a thin-layer heat exchange structure. The tube-side medium in the annular cavity can participate more directly and extensively in the heat exchange of the shell-side medium outside the outer tube through the tube wall, without mutual flow with the tube-side medium in the inner tube. This effectively reduces the heat exchange resistance of the tube-side medium in the annular cavity, thereby improving the heat exchange performance. In particular, after providing a heat insulation layer on the inner wall and / or outer wall of the inner tube, heat exchange between the tube-side medium in the annular cavity and the tube-side medium in the inner tube is prevented, making the reduction of the heat exchange resistance of the tube-side medium in the annular cavity even more significant. Meanwhile, since the inlet and outlet of the tube medium (i.e., the second port of the annular cavity and the second end of the inner tube) of the present invention are located at the same end in the length direction of the heat exchange core, it is only necessary to set a tube sheet and a tube box for supporting the ends of the heat exchange tubes at the same end of the heat exchange core; and the shape of the heat exchange tubes wound around the central cylinder is the same as that of the prior art, and the tube sheet can be opened with corresponding tube holes for each heat exchange tube. That is, by using such a heat exchange core, it is beneficial to make the heat exchanger into a detachable structure, which is convenient for future maintenance and installation. Attached Figure Description

[0034] Figure 1 This is a cross-sectional view of the wound tube heat exchanger according to Embodiment 1 of the present invention;

[0035] Figure 2 This is a schematic diagram of the distribution plate according to Embodiment 1 of the present invention;

[0036] Figure 3 for Figure 1Enlarged view of section I;

[0037] Figure 4 for Figure 3 Sectional view along the middle AA direction;

[0038] Figure 5 for Figure 3 Sectional view along the BB direction. Detailed Implementation

[0039] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0040] Example 1:

[0041] like Figures 1-5 As shown, this is a preferred embodiment of a heat exchange core and a wound tube heat exchanger having the heat exchange core of the present invention. The heat exchange core includes a central cylinder 1 and multiple heat exchange tubes 2.

[0042] The central cylinder 1 is set vertically.

[0043] Each heat exchange tube 2 is arranged vertically and spirally wound around the outer circumference of the central cylinder 1 from the inside out. Each heat exchange tube 2 includes an outer tube 21 and an inner tube 22. The top end 211 of the outer tube 21 is open, and the bottom end 212 is closed. The bottom first end 221 of the inner tube 22 is open, and the top second end 222 is open. The first end 221 of the inner tube 22 is inserted into the outer tube 21 from the top end 211 downwards and is adjacent to the bottom end 212 of the outer tube 21. The second end 222 of the inner tube 22 is located outside the top end 211 of the outer tube 21 to allow the tube-side medium to enter or exit the inner tube 22. Meanwhile, the outer wall surface of the inner tube 22 located inside the outer tube 21 is spaced apart from the inner wall surface of the corresponding outer tube 21 to form an annular cavity 20 extending along the length direction of the heat exchange tube 2. The first port 201 at the bottom of the annular cavity 20 corresponds to the tail end 212 of the outer tube 21 and is connected to the first end 221 of the inner tube 22. The second port 202 at the top of the annular cavity 20 corresponds to the head end 211 of the outer tube 21 to allow the tube-side medium to pass through.

[0044] Meanwhile, multiple positioning pieces 23 are circumferentially spaced protruding from the outer wall of the inner tube 22 located within the outer tube 21. Each positioning piece 23 is located within the annular cavity 20 and contacts the wall of the outer tube 21. In this embodiment, three positioning pieces 23 arranged circumferentially spaced form a positioning piece group, and there are multiple positioning piece groups arranged at intervals along the extension direction of the annular cavity 20. Furthermore, the positioning pieces 23 in adjacent positioning piece groups are staggered axially.

[0045] The wound tube heat exchanger of this embodiment includes a shell-side cylinder 3, a first tube sheet 4, a second tube sheet 5, an inlet tube box 52, an outlet tube box 51, a distribution plate 6, and the aforementioned heat exchange core.

[0046] The shell-side cylinder 3 is vertically arranged, with its bottom closed and equipped with a shell-side inlet pipe 31 for inputting shell-side medium, and its upper side wall equipped with a shell-side outlet pipe 32 for outputting shell-side medium.

[0047] The first tube sheet 4 is located at the upper end of the shell-side cylinder 3 and has multiple first tube holes for supporting the head ends 211 of the outer tubes 21 of their respective heat exchange tubes 2. The second tube sheet 5 is located above the first tube sheet 4 and forms an outlet tube box 51 between the two. The side wall of the outlet tube box 51 has a tube-side outlet connector 511 for outputting the tube-side medium. The second tube sheet 5 also has multiple second tube holes for supporting the second ends 222 of the inner tubes 22 of their respective heat exchange tubes 2. The inlet tube box 52 is located on the second tube sheet 5, and the top of the inlet tube box 52 has a tube-side inlet connector 521 for inputting the tube-side medium.

[0048] The aforementioned heat exchange core is vertically arranged inside the shell-side cylinder 3, and the head end 211 of the outer tube 21 of each heat exchange tube 2 is supported at the first tube hole of the first tube sheet 4 and connected to the outlet tube box 51 (the connection method between the head end of the outer tube and the first tube hole is the same as the prior art, such as the head end of the outer tube is connected to the edge of the first tube hole and then fixed together by welding). The second end 222 of the inner tube 22 passes through the first tube hole of the first tube sheet 4 and is supported at the second tube hole of the second tube sheet 5 and connected to the inlet tube box 52.

[0049] The aforementioned distribution plate 6 is horizontally positioned inside the shell-side cylinder 3, corresponding to the tail end 212 of the outer tube 21, and above the shell-side inlet pipe 31. The inner wall of the shell-side cylinder 3 is provided with a flange 33 to support the distribution plate 6 so that it can be placed on the flange 33. The distribution plate 6 has a central through-hole 60 penetrating the plate thickness, a first part 61 surrounding the central through-hole 60, and a second part 62 surrounding the first part 61. The central through-hole 60 allows the central cylinder 1 to pass through. The first part 61 has a through-hole 611 for the tail end 212 of the outer tube 21 to pass through. The second part 62 has multiple flow equalization holes 621 spaced circumferentially. Multiple flow equalization holes 621 spaced circumferentially form a group, with three groups (or two, four, five, or more), arranged spaced in the inward and outward directions. For two adjacent groups of flow equalization holes, the flow area of ​​the inner flow equalization hole 621 is smaller than that of the outer flow equalization hole 621.

[0050] In this embodiment, the integral component consisting of the heat exchange core, distribution plate 6, first tube sheet 4, second tube sheet 5, inlet tube box 52, and outlet tube box 51 is connected to the flange on the end of the shell-side cylinder 3 via flange 7, so that the integral component can be detached from the shell-side cylinder 3 for cleaning, maintenance, etc.

[0051] When the heat exchanger is working, the shell-side medium (high-temperature process gas in this embodiment) is input from the bottom of the heat exchanger, flows upward and enters the space where the heat exchange tube 2 is located after passing through the flow equalization holes 621 on the distribution plate 6. The distribution plate 6 can constrain the tail end of the heat exchange tube, and also play a role in vibration reduction and fluid uniform distribution, reducing the risk of vibration at the tail end of the heat exchange tube caused by the high-temperature process gas blowing directly on it. The tube-side medium (deoxygenated water in this embodiment) enters the inlet tube box 52 from the top of the heat exchanger, then flows into the inner tube 22 and flows downward along the inner tube 22. Then, it enters the annular cavity 20 between the inner tube 22 and the outer tube 21 at the bottom of the heat exchange tube, and exchanges heat with the shell-side medium in the annular cavity 20. The heat-exchanged steam-water mixture flows upward in the annular cavity 20 and is discharged through the outlet tube box 51.

[0052] The spiral wound tube heat exchanger in this embodiment breaks away from the columnar flow pattern inside the heat exchange tubes of traditional spiral wound tube heat exchangers. The steam-water mixture has a thin-layer heat exchange structure inside the annular cavity, which effectively reduces the heat exchange resistance of the medium inside the annular cavity and improves the heat exchange performance.

[0053] Example 2:

[0054] This embodiment is basically the same as Embodiment 1, except that in this embodiment, the inner wall and / or outer wall of the inner tube 22 located inside the outer tube 21 is provided with a heat insulation layer. The heat insulation layer is a heat-insulating ceramic coating, and the heat insulation layer is located at the lower part of the inner tube 22 to avoid heat transfer between the tube-side medium in the lower part of the annular cavity 20 and the tube-side medium in the lower part of the inner tube 22.

[0055] Example 3:

[0056] This embodiment is basically the same as Embodiment 1, except that in this embodiment, the entire inner wall and / or outer wall of the inner tube 22 are provided with a heat insulation layer, which is a heat-insulating ceramic coating, so as to avoid heat transfer between the tube-side medium in the annular cavity 20 and the tube-side medium in the inner tube 22.

[0057] The specification and claims of this invention use terms indicating direction, such as "upper," "lower," "side," "top," and "bottom," to describe various exemplary structural parts and elements of the invention. However, these terms are used herein merely for ease of explanation and are determined based on the exemplary orientations shown in the accompanying drawings. Since the embodiments disclosed in this invention can be arranged in different orientations, these terms indicating direction are for illustrative purposes only and should not be considered as limitations. For example, "upper" and "lower" are not necessarily limited to directions opposite to or consistent with the direction of gravity.

[0058] The term "vertical" is also used in the specification and claims of this invention, 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.

Claims

1. A heat exchange core, comprising: Central tube (1); Multiple heat exchange tubes (2) are spirally wound around the outer periphery of the central cylinder (1) along the axial direction; Its features Each heat exchange tube (2) includes: The outer tube (21) has an open head end (211) and a closed tail end (212); The inner tube (22) has its first end (221) open and inserted into the outer tube (21) from the head end (211) and adjacent to the tail end (212) of the outer tube (21). Its second end (222) is open and located outside the head end (211) of the outer tube (21) so that the tube-side medium can enter or flow out of the inner tube (22). The outer wall surface of the inner tube (22) located in the outer tube (21) is spaced apart from the inner wall surface of the corresponding outer tube (21) to form an annular cavity (20) extending along the length direction of the heat exchange tube (2). The first port (201) of the annular cavity (20) corresponds to the tail end (212) of the outer tube (21) and is connected to the first end (221) of the inner tube (22). The second port (202) of the annular cavity (20) corresponds to the head end (211) of the outer tube (21) so that the tube-side medium can pass through.

2. The heat exchange core according to claim 1, characterized in that: At least two positioning pieces (23) are circumferentially spaced on the outer wall surface of the inner tube (22) located inside the outer tube (21). Each positioning piece (23) is located in the annular cavity (20) and is in contact with the inner wall surface of the outer tube (21).

3. The heat exchange core according to claim 2, characterized in that: At least two positioning pieces (23) arranged at intervals in the circumferential direction constitute a positioning piece group, and there are at least two positioning piece groups arranged at intervals along the extension direction of the annular cavity (20).

4. The heat exchange core according to claim 3, characterized in that: The positioning pieces (23) in two adjacent positioning piece groups are staggered in the axial direction.

5. The heat exchange core according to any one of claims 1 to 4, characterized in that: The inner tube (22) located inside the outer tube (21) has a heat insulation layer on at least part of its inner wall surface and / or outer wall surface.

6. A wound tube heat exchanger, comprising: The vertically arranged shell-side cylinder (3) is provided with a shell-side inlet pipe (31) and a shell-side outlet pipe (32) for the shell-side medium to pass through; First tube sheet (4) and second tube sheet (5); The heat exchange core is vertically disposed inside the shell-side cylinder (3); Its features are: The heat exchange core is the heat exchange core as described in any one of claims 1 to 5; The first tube sheet (4) is located at the upper end of the shell-side cylinder (3) and has a first tube hole for supporting the head end (211) of the outer tube (21); The second tube sheet (5) is located on the upper side of the first tube sheet (4) and forms an outlet tube box (51) with a tube outlet connector (511) between it and the first tube sheet (4). At the same time, the second tube sheet (5) is provided with a second tube hole for supporting the second end (222) of the inner tube (22). An inlet tube box (52) with a tube-side inlet connector (521) is provided on the second tube sheet (5); The head end (211) of the outer tube (21) is supported on the first tube sheet (4) and connected to the outlet tube box (51) through the first tube hole. The second end (222) of the inner tube (22) is supported on the second tube sheet (5) and connected to the inlet tube box (52) through the second tube hole.

7. The wound tube heat exchanger according to claim 6, characterized in that: It also includes a distribution plate (6), which is placed horizontally inside the shell-side cylinder (3) and corresponds to the position of the tail end (212) of the outer tube (21). The distribution plate (6) has a central through hole (60) that penetrates the plate thickness, a first part (61) located around the central through hole (60), and a second part (62) located around the first part (61). The central through hole (60) allows the central cylinder (1) to pass through. The first part (61) is provided with a through hole (611) for the tail end (212) of the outer tube (21) to pass through. The second part (62) is provided with a plurality of flow equalization holes (621) spaced circumferentially. The shell-side inlet pipe (31) is located at the bottom of the shell-side cylinder (3) and below the distribution plate (6). The shell-side outlet pipe (32) is located at the top of the shell-side cylinder (3).

8. The wound tube heat exchanger according to claim 7, characterized in that: Multiple flow equalization holes (621) distributed circumferentially are grouped into a group, with at least two groups, and are arranged at intervals along the inside and outside directions. For two adjacent groups of flow equalization holes, the flow area of ​​the flow equalization hole (621) located on the inside is smaller than the flow area of ​​the flow equalization hole (621) located on the outside.

9. The wound tube heat exchanger according to claim 6, characterized in that: The heat exchange core and the integral component consisting of the first tube sheet (4), the second tube sheet (5), the inlet tube box (52), and the outlet tube box (51) are arranged to be able to detach upward from the shell-side cylinder (3).

10. The wound tube heat exchanger according to claim 9, characterized in that: The integral component and the shell-side cylinder (3) are connected correspondingly by their respective flanges (7).

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