Multi-strand winding pipe type heat exchanger

Abstract

A multi-stream winding pipe type heat exchanger comprises a shell pass barrel, a first shell pass barrel, a second shell pass barrel, a first heat exchanger and a second heat exchanger, the two groups of heat exchange tubes are respectively a first group of heat exchange tubes and a second group of heat exchange tubes, and are spirally wound in the shell pass cylinder along the first direction; the two first tube plates are respectively arranged at the first end part and the second end part of the shell pass cylinder so as to support the two ends of the first group of heat exchange tubes; the two second tube plates are arranged on the shell pass barrel corresponding to the two ends of the second group of heat exchange tubes so as to support the two ends of the second group of heat exchange tubes; the length of the second group of heat exchange tubes in the first direction is smaller than that of the first group of heat exchange tubes in the first direction, and the second group of heat exchange tubes are arranged corresponding to local parts of the first group of heat exchange tubes; and at least one of the two second tube plates is arranged on the side wall of the middle part of the shell pass barrel. Compared with the prior art, the temperature difference of each tube pass medium before and after heat exchange is different.

Description

Technical Field

[0001] The invention belongs to the technical field of heat exchangers, and in particular relates to a multi-stream wound tube heat exchanger. Background Art

[0002] The existing multi-stream wound tube heat exchanger, such as the structure disclosed in the Chinese utility model patent No. 201420655906.2 "New Multi-stream Heat Exchanger" (authorization announcement No. CN204359171U), includes a shell, heat exchange tubes arranged in the shell, and upper tube sheets and lower tube sheets arranged at both ends of the shell. The two ends of the heat exchange tubes are respectively limited on the upper and lower tube sheets, and the shell is provided with a shell side inlet and a shell side outlet connected to the inner cavity of the shell; and there are multiple groups of heat exchange tubes, and the part of each heat exchange tube group located between the upper and lower tube sheets is spirally wound along the axial direction of the shell, and the shell is provided with a plurality of tube side outlets and tube side inlets connected to each heat exchange tube group respectively. When in use, different tube side media can be introduced into each heat exchange tube group, and heat is exchanged with the fluid in the shell at the same time, thereby improving the heat exchange efficiency.

[0003] However, the existing multi-stream wound tube heat exchanger has the following technical problems to be solved:

[0004] The flow paths of the tube-side media in each group of heat exchange tubes are close, resulting in a close temperature difference before and after the heat exchange of each tube-side medium. However, under certain working conditions, the temperatures to be heated or cooled of the media in each tube-side are different, such as the temperature difference before and after the heat exchange of the first tube-side medium needs to be greater than the temperature difference before and after the heat exchange of the second tube-side medium. The existing multi-stream wound tube heat exchanger cannot meet the requirements under the above working conditions. Summary of the invention

[0005] The first technical problem to be solved by the present invention is to provide a multi-stream wound tube heat exchanger in view of the current status of the prior art, so that the temperature difference before and after heat exchange of the medium in each tube pass is different.

[0006] The second technical problem to be solved by the present invention is to provide a multi-stream wound tube heat exchanger to improve the heat exchange efficiency.

[0007] The technical solution adopted by the present invention to solve the above-mentioned first technical problem is: a multi-stream wound tube heat exchanger, comprising:

[0008] The shell-side cylinder has a first end, a second end, and a middle portion between the first end and the second end, and the axial direction of the shell-side cylinder is the first direction, and the radial direction is the second direction;

[0009] Two groups of heat exchange tubes, namely a first group of heat exchange tubes and a second group of heat exchange tubes, are spirally wound along the first direction and arranged in the shell-side cylinder;

[0010] Two first tube sheets are respectively arranged on the first end and the second end of the shell-side cylinder to support the two ends of the first group of heat exchange tubes;

[0011] Two second tube sheets, corresponding to the two ends of the second group of heat exchange tubes, are arranged on the shell side cylinder to support the two ends of the second group of heat exchange tubes;

[0012] Features:

[0013] The length of the second group of heat exchange tubes in the first direction is smaller than the length of the first group of heat exchange tubes in the first direction, and the second group of heat exchange tubes corresponds to a local arrangement of the first group of heat exchange tubes;

[0014] At least one of the two second tube sheets is arranged on the side wall of the middle part of the shell side cylinder.

[0015] In this way, each tube-side medium can be input into each group of heat exchange tubes respectively as needed. Since the length of the second group of heat exchange tubes is shorter than that of the first group of heat exchange tubes, the flow path of the tube-side medium in the second group of heat exchange tubes is shorter than that of the tube-side medium in the first group of heat exchange tubes, thereby making the temperature difference of the tube-side medium in the second group of heat exchange tubes before and after heat exchange smaller than that of the tube-side medium in the first group of heat exchange tubes before and after heat exchange, thereby achieving different temperature differences before and after heat exchange of each tube-side medium.

[0016] In the present invention, the second group of heat exchange tubes can be arranged corresponding to the middle of the first group of heat exchange tubes, or can be arranged corresponding to the end of the first group of heat exchange tubes, or can be arranged corresponding to the middle and one of the ends of the first group of heat exchange tubes.

[0017] Preferably, the first group of heat exchange tubes has a first spiral section and a second spiral section arranged along a first direction, and the second group of heat exchange tubes is arranged corresponding to the first spiral section.

[0018] Furthermore, the first spiral section of the first group of heat exchange tubes of the shell-side cylinder and the part where the second group of heat exchange tubes are located are the first part, and the part where the second spiral section of the first group of heat exchange tubes of the shell-side cylinder is located is the second part, and the inner diameter of the first part is greater than the inner diameter of the second part. Thus, the following technical effects can be achieved: 1. According to the winding situation, the inner diameters of the first and second parts of the shell-side cylinder are designed accordingly, making the overall structure more compact; 2. The first part with a larger inner diameter is conducive to assembly and subsequent inspection and maintenance.

[0019] Preferably, the first group of heat exchange tubes further comprises a first straight tube section located between the first spiral section and the second spiral section to connect the first and second spiral sections.

[0020] Preferably, the first straight pipe section is arranged corresponding to the first part of the shell-side cylinder.

[0021] Furthermore, one of the second tube sheets is arranged on the side wall of the middle part of the shell side cylinder corresponding to the first straight tube section.

[0022] Furthermore, a manhole for personnel to enter and exit is provided on the side wall of the first part of the shell-side cylinder at a position corresponding to the first straight pipe section, so as to facilitate inspection and maintenance.

[0023] In the above schemes, the shell-side cylinder can be horizontally or vertically placed. Preferably, the shell-side cylinder is vertically arranged, and the first part and the second part of the shell-side cylinder are arranged one below the other.

[0024] In the above schemes, the second group of heat exchange tubes can be sleeved on the outer periphery of the first group of heat exchange tubes. Preferably, the first group of heat exchange tubes are spirally wound layer by layer from the inside to the outside to form a multi-layer spiral tube, and the second group of heat exchange tubes are spirally wound in each layer of spiral tube along the spiral direction of the first group of heat exchange tubes. Thus, the heat exchange effect of each group of heat exchange tubes is guaranteed.

[0025] To further solve the above second technical problem, preferably, the method further comprises:

[0026] A plurality of third heat exchange tubes are arranged along the second direction at the periphery of the end of the first group of heat exchange tubes and in the shell-side cylinder;

[0027] Two third tube sheets are arranged oppositely on the radial sides of the shell-side cylinder and adjacent to the first tube sheet for supporting the ends of the first group of heat exchange tubes, so as to support the two ends of the third heat exchange tubes.

[0028] The ends of the first group of heat exchange tubes may be both ends of the first group of heat exchange tubes, or one of the ends. The end preferably corresponds to the shell-side medium inlet side.

[0029] In the prior art, the heat exchange efficiency at the end of the shell-side cylinder is low. The design of the third heat exchange tube in the present invention can overcome this technical problem and use the space at the end of the shell-side cylinder to improve the shell-side heat exchange efficiency. And because the third heat exchange tube is arranged along the second direction, the flow path of the tube-side medium in the third heat exchange is short, so that the temperature difference of the tube-side medium before and after heat exchange through the third heat exchange tube can be better controlled, and the temperature difference is different from the temperature difference of the medium in the first and second groups of heat exchange tubes before and after heat exchange. At the same time, because the third heat exchange tube is arranged at the periphery of the end of the first group of heat exchange tubes along the second direction, the third heat exchange tube can play a role in equalizing flow, improve the fluid distribution of the shell-side medium at the end of the shell-side cylinder (distribution is more uniform), and thus reduce the heat exchange dead angle.

[0030] Preferably, the plurality of third heat exchange tubes are divided into two groups and are respectively arranged in a C-shape with the C-shaped openings facing each other on radial sides of the end of the first group of heat exchange tubes from the inside to the outside to surround the end of the first group of heat exchange tubes as a whole.

[0031] Further, the end of the first group of heat exchange tubes is a second straight tube section extending along the first direction;

[0032] Also included are:

[0033] A support tube, which is sleeved on the outer periphery of the second straight tube section and fixed relative to the first tube sheet used for supporting the ends of the first group of heat exchange tubes, and a plurality of through holes are spaced apart on the tube wall of the support tube;

[0034] The third heat exchange tube is arranged around the periphery of the support tube.

[0035] The support tube can constrain the ends of the first group of heat exchange tubes to prevent the ends of the first group of heat exchange tubes from shaking during heat exchange. At the same time, the support tube can support the third heat exchange tube, and the through holes on the support tube can allow the shell side medium to flow.

[0036] Furthermore, the third heat exchange tubes in the inner and outer adjacent layers and the third heat exchange tube in the innermost layer and the support tube are constrained together by gaskets, and each gasket extends along the first direction.

[0037] Further, the shell-side cylinder includes a straight cylinder extending along the first direction and a hemispherical head provided on the port of the straight cylinder, the end of the hemispherical head is provided with the above-mentioned first tube sheet, and the side wall of the hemispherical head is provided with the above-mentioned third tube sheet and a shell-side pipe for the shell-side medium to pass through;

[0038] The third heat exchange tube is arranged in the hemispherical head.

[0039] Preferably, the hemispherical head is located at the upper end of the straight cylinder, and the third heat exchange tubes are arranged in a structure with a small upper end and a large lower end, so as to match the shape of the hemispherical head. Thus, the third heat exchange tube can effectively use the space in the hemispherical head.

[0040] Compared with the prior art, the advantage of the present invention is that: by designing the length of the second group of heat exchange tubes to be smaller than the length of the first group of heat exchange tubes, and the second group of heat exchange tubes are locally arranged corresponding to the first group of heat exchange tubes, each tube-side medium can be respectively input into each group of heat exchange tubes as needed, so that the flow path of the tube-side medium in the second group of heat exchange tubes is smaller than the flow path of the tube-side medium in the first group of heat exchange tubes, so that the temperature difference of the tube-side medium in the second group of heat exchange tubes before and after heat exchange is smaller than the temperature difference of the tube-side medium in the first group of heat exchange tubes before and after heat exchange, thereby achieving different temperature differences before and after heat exchange of each tube-side medium. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the present invention;

[0042] Figure 2 This is a schematic diagram of the structure of Embodiment 2 of the present invention;

[0043] Figure 3 for Figure 2 A magnified view of the local structure in

[0044] Figure 4 It is a schematic diagram of the structure of the support tube in the second embodiment of the present invention;

[0045] Figure 5 It is a partial structural cross-sectional view of the second embodiment of the invention;

[0046] Figure 6 for Figure 5 A top view of the local structure;

[0047] Figure 7 for Figure 5 Enlarged view of the left part of the middle section;

[0048] Figure 8 This is a schematic diagram of the structure of the cushion strip in the second embodiment of the invention;

[0049] Fig. 9 It is a partial cross-sectional view between the gasket and the third heat exchange tube in the third embodiment of the invention. DETAILED DESCRIPTION

[0050] The present invention is further described in detail below with reference to the accompanying drawings.

[0051] Embodiment 1: Figure 1 As shown, a preferred embodiment 1 of a multi-stream wound tube heat exchanger of the present invention is shown. The multi-stream wound tube heat exchanger includes a shell-side cylinder 1, heat exchange tubes, a first tube sheet 4 and a second tube sheet 5.

[0052] The shell-side cylinder 1 is arranged vertically (i.e., the first direction described in the claims and the specification of the present invention), and has a first end 11 at the upper end, a second end 12 at the lower end, and a middle portion 13 between the first end 11 and the second end 12. The shell-side cylinder 1 is composed of a first part 1a and a second part 1b arranged one above the other, and the inner diameter of the first part 1a is greater than the inner diameter of the second part 1b. The lower end of the first part 1a is the second end 12 of the shell-side cylinder 1, and a first tube sheet 4 is provided. The second part 1b has a vertically extending straight cylinder 101 and a hemispherical head 102 provided on the upper port of the straight cylinder 101, and the upper end of the hemispherical head 102 is the first end 11 of the shell-side cylinder 1, and a first tube sheet 4 is provided. At the same time, a shell-side pipe 103 for the shell-side medium to pass through is provided on the hemispherical head 102 and the second end 12 of the shell-side cylinder 1.

[0053] Second tube sheets 5 are provided on the side wall of the middle portion 13 of the shell-side cylinder 1 (i.e., the side wall of the upper portion of the first portion 1a) and the position of the shell-side cylinder 1 adjacent to the second end portion 12.

[0054] There are two groups of heat exchange tubes, namely the first group of heat exchange tubes 2 and the second group of heat exchange tubes 3, which are spirally wound in the shell-side cylinder 1 along the up-down direction. Specifically, the first group of heat exchange tubes 2 are spirally wound layer by layer from the inside to the outside to form a multi-layer spiral tube, and the second group of heat exchange tubes 3 are spirally wound in each layer of spiral tubes along the spiral direction of the first group of heat exchange tubes 2. At the same time, the first group of heat exchange tubes 2 have a second straight tube section 24, a first spiral section 21, a first straight tube section 23, a second spiral section 22 and a third straight tube section 25 arranged from bottom to top, and the first spiral section 21 and the first straight tube section 23 are arranged in the first part 1a of the shell-side cylinder 1, and the first straight tube section 23 is opposite to the second tube sheet 5 on the side wall of the shell-side cylinder 1. The second spiral section 22 is arranged in the second part 1b of the shell-side cylinder 1. The upper end of the second straight tube section 24 and the lower end of the third straight tube section 25 are respectively supported on the corresponding first tube sheet 4. The second group of heat exchange tubes 3 is arranged in the first part 1a of the shell-side cylinder 1 corresponding to the first spiral section 21, and the two ends of the second group of heat exchange tubes 3 are respectively supported on two second tube sheets 5, so that the length of the second group of heat exchange tubes 3 in the vertical direction is smaller than the length of the first group of heat exchange tubes 2 in the vertical direction.

[0055] In addition, a manhole 10 for personnel to enter and exit is provided on the side wall of the first portion 1a of the shell-side cylinder 1 at a position corresponding to the first straight pipe section 23.

[0056] When in use, the two tube-side media can be respectively input into the corresponding groups of heat exchange tubes as needed. Since the flow path of the tube-side medium in the second group of heat exchange tubes is smaller than the flow path of the tube-side medium in the first group of heat exchange tubes, the temperature difference of the tube-side medium in the second group of heat exchange tubes before and after heat exchange is smaller than the temperature difference of the tube-side medium in the first group of heat exchange tubes before and after heat exchange, thereby achieving different temperature differences before and after heat exchange of each tube-side medium.

[0057] Embodiment 2:

[0058] like Figures 2 to 8 As shown, a preferred embodiment 2 of a multi-stream wound tube heat exchanger of the present invention is shown. This embodiment is basically the same as the embodiment 1, except that this embodiment also includes a plurality of third heat exchange tubes 6, a third tube sheet 7, a support tube 8 and a gasket 9.

[0059] There are two third tube sheets 7 which are arranged on the side walls of both sides of the hemispherical head 102 opposite to each other.

[0060] The support tube 8 is sleeved on the outer circumference of the second straight tube section 24 of the first group of heat exchange tubes 2 and inside the hemispherical head 102, and is fixed relative to the first tube sheet 4 on the hemispherical head 102 (the two can be connected by welding), and a plurality of through holes 80 are distributed at intervals on the wall of the support tube 8. In this embodiment, a plurality of through holes arranged at intervals in the circumferential direction are grouped, and there are multiple groups, which are arranged at intervals in the vertical direction. The through holes between two adjacent groups are staggered in the vertical direction. For details, please refer to Figure 4 .

[0061] The plurality of third heat exchange tubes 6 are arranged from the inside to the outside of the support tube 8 and the hemispherical head 102 along the horizontal direction (i.e., the second direction described in the claims and the specification of the present invention), and the two ends of the third heat exchange tubes 6 are respectively supported on the corresponding third tube sheets 7. In this embodiment, the plurality of third heat exchange tubes 6 are divided into two groups, and are respectively arranged in a C-shaped manner with the C-shaped openings facing each other on the radial sides of the support tube 8 to surround the support tube 8 as a whole. For details, please refer to Figure 6 At the same time, the third heat exchange tubes 6 are arranged in a structure with a small upper end and a large lower end, so as to match the shape of the hemispherical head 102. In this embodiment, the third heat exchange tubes 6 are arranged in a truncated cone (i.e., a truncated cone) so that as many third heat exchange tubes 6 as possible are distributed in the hemispherical head 102 to ensure the heat exchange effect. For details, please refer to Figure 5 The cross-sectional portion indicated by arrow B.

[0062] In this embodiment, in order to better constrain the third heat exchange tube 6, the inner and outer adjacent layers of the third heat exchange tube 6 and the innermost layer of the third heat exchange tube 6 and the support tube 8 are constrained together by gaskets 9, and each gasket 9 extends along the first direction and is arranged at intervals along the circumferential direction. Figure 8 As shown, a plurality of semicircular grooves 90 are provided on the gasket strip 9 along the length direction, so that the corresponding third heat exchange tube 6 can be constrained therein. At the same time, the inner and outer adjacent gasket strips 9 can be connected by welding (see welding position for details). Figure 8 When in use, the shell-side medium can be input from the shell-side pipe 103 on the hemispherical head 102, exchange heat with the medium in the third heat exchange tube 6, and then flow downward through the gaps between the adjacent third heat exchange tubes 6 and the through holes 80 on the support tube 8 to exchange heat with the first group of heat exchange tubes 2 and the second group of heat exchange tubes 3, and finally output from the shell-side pipe 103 on the second end 12 of the shell-side cylinder 1.

[0063] Embodiment three:

[0064] like Fig. 9As shown, a preferred embodiment 3 of a multi-stream wound tube heat exchanger of the present invention is shown. This embodiment is basically the same as the second embodiment, except that this embodiment constrains the third heat exchange tube 6 by the cooperation between the gasket 9 and the pipe clamp 91, and the cooperation between the gasket 9 and the pipe clamp 91 is the same as the prior art, which will not be described in detail here.

[0065] In the specification and claims of the present invention, terms indicating directions, such as "front", "rear", "up", "down", "left", "right", "side", "top", "bottom", etc., are used to describe various exemplary structural parts and elements of the present invention, but these terms are used here only for the purpose of convenience of description and are determined based on the exemplary orientations shown in the accompanying drawings. Since the embodiments disclosed in the present invention can be arranged in different directions, these terms indicating directions are only used as explanations and should not be regarded as limitations. For example, "up" and "down" are not necessarily limited to directions opposite to or consistent with the direction of gravity.

[0066] The term "vertical" is also used in the specification and claims of the present invention, which means basically along the up and down direction, and is not limited to the vertical direction only, and can also be slightly inclined relative to the vertical direction.

[0067] The term "radial" is also used in the specification and claims of the present invention, which means basically along the inward and outward direction, and is not limited to the radial direction passing through the center of the circle, and can also be slightly deviated from the radial direction.

Claims

1. A multi-stream wound tube heat exchanger, comprising: The shell-side cylinder (1) comprises a first end (11), a second end (12) and a middle portion (13) located between the first end (11) and the second end (12), wherein the axial direction of the shell-side cylinder (1) is the first direction and the radial direction is the second direction; Two groups of heat exchange tubes, namely a first group of heat exchange tubes (2) and a second group of heat exchange tubes (3), are spirally wound along the first direction and arranged inside the shell-side cylinder (1); Two first tube sheets (4) are respectively arranged on a first end (11) and a second end (12) of the shell-side cylinder (1) to support both ends of the first group of heat exchange tubes (2); Two second tube sheets (5) are arranged on the shell-side cylinder (1) corresponding to the two ends of the second group of heat exchange tubes (3) to support the two ends of the second group of heat exchange tubes (3); Features: The length of the second group of heat exchange tubes (3) in the first direction is less than the length of the first group of heat exchange tubes (2) in the first direction, and the second group of heat exchange tubes (3) is arranged corresponding to a part of the first group of heat exchange tubes (2); At least one of the two second tube sheets (5) is arranged on the side wall of the middle portion (13) of the shell-side cylinder (1).

2. The multi-stream wound tube heat exchanger according to claim 1, characterized in that: The first group of heat exchange tubes (2) comprises a first spiral section (21) and a second spiral section (22) arranged along a first direction, and the second group of heat exchange tubes (3) is arranged corresponding to the first spiral section (21).

3. The multi-stream wound tube heat exchanger according to claim 2, characterized in that: The first spiral section (21) of the first group of heat exchange tubes (2) of the shell-side cylinder (1) and the portion where the second group of heat exchange tubes (3) are located are referred to as the first portion (1a), and the second spiral section (22) of the first group of heat exchange tubes (2) of the shell-side cylinder (1) is referred to as the second portion (1b). The inner diameter of the first portion (1a) is greater than the inner diameter of the second portion (1b).

4. The multi-stream wound tube heat exchanger according to claim 3, characterized in that: The first group of heat exchange tubes (2) also has a first straight tube section (23) located between the first spiral section (21) and the second spiral section (22) to connect the first and second spiral sections (22).

5. The multi-stream wound tube heat exchanger according to claim 4, characterized in that: The first straight pipe section (23) is arranged corresponding to the first part (1a) of the shell-side cylinder (1).

6. The multi-stream wound tube heat exchanger according to claim 5, characterized in that: One of the second tube sheets (5) is arranged on the side wall of the middle part (13) of the shell-side cylinder (1) corresponding to the first straight tube section (23).

7. The multi-stream wound tube heat exchanger according to claim 5, characterized in that: A manhole (10) for personnel to enter and exit is provided on the side wall of the first part (1a) of the shell-side cylinder (1) at a position corresponding to the first straight pipe section (23).

8. The multi-stream wound tube heat exchanger according to any one of claims 3 to 7, characterized in that: The shell-side cylinder (1) is arranged vertically, and the first part (1a) and the second part (1b) of the shell-side cylinder (1) are arranged one below the other.

9. The multi-stream wound tube heat exchanger according to any one of claims 1 to 7, characterized in that: The first group of heat exchange tubes (2) are spirally wound layer by layer from the inside to the outside to form a multi-layer spiral tube, and the second group of heat exchange tubes (3) are spirally wound in each layer of spiral tube along the spiral direction of the first group of heat exchange tubes (2).

10. The multi-stream wound tube heat exchanger according to any one of claims 1 to 7, characterized in that: Also included are: A plurality of third heat exchange tubes (6) are arranged along the second direction at the periphery of the ends of the first group of heat exchange tubes (2) and inside the shell-side cylinder (1); Two third tube sheets (7) are arranged on both radial sides of the shell-side cylinder (1) and are adjacent to the first tube sheet (4) used for supporting the ends of the first group of heat exchange tubes (2) to support the two ends of the third heat exchange tube (6).

11. The multi-stream wound tube heat exchanger according to claim 10, characterized in that: The plurality of third heat exchange tubes (6) are divided into two groups and are arranged in a C-shape with the C-shaped openings facing each other from the inside to the outside on both radial sides of the end of the first group of heat exchange tubes (2) so as to surround the end of the first group of heat exchange tubes (2) as a whole.

12. The multi-stream wound tube heat exchanger according to claim 11, characterized in that: The end of the first group of heat exchange tubes (2) is a second straight tube section (24) extending along the first direction; Also included are: A support tube (8) is sleeved on the outer periphery of the second straight tube section (24) and fixed relative to a first tube sheet (4) for supporting the ends of the first group of heat exchange tubes (2), and a plurality of through holes (80) are spaced apart on the tube wall of the support tube (8); The third heat exchange tube (6) is arranged around the periphery of the support tube (8).

13. The multi-stream wound tube heat exchanger according to claim 12, characterized in that: The third heat exchange tubes (6) in the inner and outer adjacent layers and the third heat exchange tube (6) in the innermost layer and the support tube (8) are restrained together by gaskets (9), and each gasket (9) extends along the first direction.

14. The multi-stream wound tube heat exchanger according to claim 10, characterized in that: The shell-side cylinder (1) comprises a straight cylinder (101) extending along the first direction and a hemispherical head (102) arranged on the port of the straight cylinder (101); the end of the hemispherical head (102) is provided with the above-mentioned first tube sheet (4); the side wall of the hemispherical head (102) is provided with the above-mentioned third tube sheet (7) and a shell-side pipe (103) for shell-side medium to pass through; The third heat exchange tube (6) is arranged in the hemispherical head.

15. The multi-stream wound tube heat exchanger according to claim 14, characterized in that: The hemispherical end cap (102) is located at the upper end of the straight cylinder (101), and the plurality of third heat exchange tubes (6) are arranged around the entire structure, with the upper end being small and the lower end being large, thereby matching the shape of the hemispherical end cap (102).

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