A spiral wound heat exchanger

Abstract

The utility model provides a kind of wound pipe heat exchanger, comprising vertically arranged shell side cylinder;Upper tube plate, it is located at the upper end of shell side cylinder;Multiple heat exchange tubes are arranged in the shell side cylinder along the axial direction, and the upper end of multiple heat exchange tubes is supported on the upper tube plate;Upper tube box with tube side inlet connector on top;Fluid distribution plate is transversely arranged above the upper tube plate, and the edge of fluid distribution plate is engaged with the edge of the upper tube plate to form a cavity between fluid distribution plate and upper tube plate, which is communicated with the upper end of the multiple heat exchange tubes;Multiple through holes for tube side medium are distributed on the fluid distribution plate;The upper tube box is arranged above the fluid distribution plate and is communicated with the cavity through the through holes on the fluid distribution plate, and the upper tube box is provided with flow guide member to make the tube side medium entering from tube side inlet connector evenly distributed on the fluid distribution plate.The utility model can avoid the deflection of tube side medium at tube side inlet connector and improve the heat exchange efficiency.

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] Existing wound tube heat exchangers, such as the structure disclosed in the utility model patent "A Wound Tube Heat Exchanger with High Heat Exchange Efficiency" (authorization announcement number CN204388658U) with patent number 201420757685.X, include a shell and an upper tube sheet, a lower tube sheet, and heat exchange tubes disposed within the shell. The upper and lower ends of the heat exchange tubes pass through the upper and lower tube sheets respectively and are connected to the upper tube box and the lower tube box. The shell is provided with a shell-side inlet and a shell-side outlet. A support core is also provided inside the shell and is limited on the upper and lower tube sheets. The heat exchange tubes are spiral corrugated tubes, and there are multiple heat exchange tubes. These heat exchange tubes are divided into at least two groups. Each group of heat exchange tubes is spirally arranged inside and outside and wound around the support core, and the spiral directions of adjacent groups of heat exchange tubes are opposite.

[0003] For example, the utility model patent with patent number 201920621066.0, entitled "A Winding Tube Heat Exchanger for Gas Absorption" (authorization announcement number CN210057825U), discloses a structure that includes a shell-side cylinder; first and second tube sheets; first and second tube boxes; a central cylinder; heat exchange tubes; gas inlet pipe 1 and gas inlet pipe 2; absorbent inlet and outlet pipes; a distribution plate and a uniform distribution device. The distribution plate is horizontally arranged inside the shell-side cylinder and located at the upper part of the shell-side cylinder. The distribution plate has several through holes for the heat exchange tubes to pass through. There is a gap between the inner wall of the through hole and the outer wall of the heat exchange tube, which allows the absorbent to form a liquid film on the outer wall of the heat exchange tube. The uniform distribution device is arranged inside the shell-side cylinder and located below the distribution plate to evenly distribute the absorbent below the distribution plate onto the heat exchange tube to form a liquid film. The absorbent inlet pipe and gas inlet pipe 1 are arranged at the upper part of the shell-side cylinder and located on the upper and lower sides of the distribution plate, respectively. The absorbent outlet pipe and gas inlet pipe 2 are arranged at the lower part of the shell-side cylinder.

[0004] When a heat exchanger is working, the tube-side medium is prone to flow deviation when it enters the heat exchanger through the tube-side inlet pipe (especially the tube-side inlet pipe with a larger diameter), which makes it impossible for the tube-side medium to flow evenly to each heat exchange tube, thus affecting the heat exchange efficiency. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a wound tube heat exchanger that can avoid the deviation of the tube-side medium at the tube-side inlet pipe joint, thereby improving the heat exchange efficiency, in view of the current situation of the prior art.

[0006] The technical solution adopted by this utility model to solve the above-mentioned technical problems is: a wound tube heat exchanger, comprising:

[0007] Vertically arranged shell-side cylindrical body;

[0008] The upper tube sheet is located at the upper end of the shell-side cylinder;

[0009] Multiple heat exchange tubes are arranged axially within the shell-side cylinder, and the upper ends of the multiple heat exchange tubes are supported on the upper tube sheet.

[0010] The top of the pipe box is equipped with a pipe inlet connector;

[0011] Its characteristic is that it also includes:

[0012] A fluid distribution plate is horizontally placed above the upper tube sheet, and the edge of the fluid distribution plate is joined with the edge of the upper tube sheet to form a cavity between the fluid distribution plate and the upper tube sheet. The cavity is connected to the upper end of the multiple heat exchange tubes. The fluid distribution plate has multiple through holes spaced apart for the tube-side medium to pass through.

[0013] The upper tube box is located above the fluid distribution plate and is connected to the cavity through the through holes on the fluid distribution plate. The upper tube box is equipped with a flow guide so that the tube medium entering from the tube inlet pipe can be evenly distributed on the fluid distribution plate.

[0014] Through the design of the fluid distribution plate and the flow guides in the upper tube box, during heat exchange, the tube-side medium input through the tube-side inlet pipe is first evenly distributed onto the fluid distribution plate under the guidance of the flow guides, and then enters the cavity through the through holes on the fluid distribution plate, and enters the heat exchange tube through the upper end of each heat exchange tube for heat exchange. In this process, through the primary distribution of the flow guides and the secondary distribution of the fluid distribution plate, the tube-side medium can flow evenly into each heat exchange tube, avoiding the tube-side medium deviation at the tube-side inlet pipe, which would affect the heat exchange efficiency.

[0015] Preferably, the edge of the fluid distribution plate is joined to the edge of the upper tube sheet by a vertically extending side wall, and the side wall is provided with a manhole for maintenance personnel to enter and exit the cavity.

[0016] Preferably, the inlet pipe has a central portion and an outer portion located around the central portion;

[0017] The flow guide includes a flow guide cylinder, which is vertically disposed within the upper tube box and divides the internal space of the upper tube box into a first part located within the inner perimeter of the flow guide cylinder and a second part located outside the flow guide cylinder and within the side wall of the upper tube box. The upper port of the first part corresponds to the central part of the tube-side inlet connector, and the upper port of the second part corresponds to the outer perimeter of the tube-side inlet connector. The flow guide cylinder can guide the tube-side medium at the tube-side inlet connector to the fluid distribution plate, achieving uniform fluid distribution. Alternatively, the flow guide can also employ a structure of multiple flow guide plates arranged side-by-side, with the surfaces of adjacent flow guide plates spaced opposite each other to guide the tube-side medium downwards.

[0018] Preferably, the lower end of the guide tube is supported on the fluid distribution plate, and the lower part of the guide tube is provided with a plurality of small holes spaced apart along the circumference to connect the first part and the second part. The design of the small holes facilitates the flow of the tube-side medium in the first and second parts and promotes the uniform distribution of the tube-side medium in the circumferential direction.

[0019] Furthermore, the guide tube has a conical portion with a gradually increasing diameter from top to bottom, and a cylindrical portion extending vertically downward from the lower end of the conical portion, the cylindrical portion being provided with the aforementioned small holes.

[0020] Furthermore, the axial length of the cylindrical portion is less than the axial length of the conical portion.

[0021] Preferably, the sidewall shape of the upper tube box is consistent with the shape of the guide tube, and the upper end of the sidewall of the upper tube box is provided with the aforementioned tube-side inlet connector. This further facilitates the uniform distribution of the tube-side medium within the tube box.

[0022] In the above scheme, preferably, the diameter of the small orifice is smaller than the diameter of the through-hole. The through-hole on the fluid distribution plate is the main flow hole for the tube-side medium, and the small orifice on the guide tube is used to balance the fluid distribution in the first and second parts. The specific orifice diameter values ​​of the small orifice and through-hole are designed according to the design conditions. Furthermore, the number of small orifices is less than the number of through-holes.

[0023] To further improve the fluid distribution effect, preferably, there are at least two guide tubes, which are nested in the inner and outer directions and arranged at intervals. Adjacent guide tubes are connected by connectors arranged at intervals in the circumferential direction.

[0024] In the above-mentioned schemes, preferably, it also includes an arc-shaped bend, the first port of which is used for the input of the pipe-side medium, and the second port of which faces downward and is connected to the pipe-side inlet pipe.

[0025] Compared with the prior art, the advantages of this utility model are as follows: through the design of the fluid distribution plate and the flow guide in the upper tube box, during heat exchange, the tube-side medium input through the tube-side inlet pipe is first evenly distributed to the fluid distribution plate under the guidance of the flow guide, and then enters the cavity through the through holes on the fluid distribution plate, and enters the heat exchange tube through the upper end of each heat exchange tube for heat exchange. In this process, through the primary distribution of the flow guide and the secondary distribution of the fluid distribution plate, the tube-side medium can flow evenly into each heat exchange tube, avoiding the tube-side medium deviation at the tube-side inlet pipe and affecting the heat exchange efficiency. Attached Figure Description

[0026] Figure 1 This is a partial structural cross-sectional view of an embodiment of the present utility model;

[0027] Figure 2 for Figure 1 Enlarged view of section A in the middle;

[0028] Figure 3 for Figure 1 BB cross-section diagram in the middle;

[0029] Figure 4 This is a top view of the fluid distribution plate according to an embodiment of the present invention. Detailed Implementation

[0030] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0031] like Figures 1-4 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, an upper tube sheet 2, heat exchange tubes 3, an upper tube box 4, a fluid distribution plate 5, a flow guide 6, and a bend 7.

[0032] The shell-side cylinder 1 is vertically arranged. Similar to the prior art, the upper and lower parts of the shell-side cylinder 1 are provided with shell-side pipes for the shell-side medium to enter and exit. The upper port of the shell-side cylinder 1 is provided with an upper tube sheet 2 (the lower port of the shell-side cylinder 1 is provided with a lower tube sheet; in this embodiment, only the structure of the upper part of the heat exchanger is shown, and the lower part of the heat exchanger is a conventional design, so it is not shown in the figure).

[0033] Multiple heat exchange tubes 3 are vertically arranged inside the shell-side cylinder 1 and spirally wound from the inside out to form a multi-layer spiral tube. The upper end of each heat exchange tube 3 is supported on the upper tube sheet 2, and the lower end of each heat exchange tube 3 is supported on the lower tube sheet.

[0034] The fluid distribution plate 5 is horizontally positioned above the upper tube sheet 2, and the edge of the fluid distribution plate 5 is joined to the edge of the upper tube sheet 2 by a vertically extending side wall 52, thereby forming a cavity 50 between the fluid distribution plate 5, the upper tube sheet 2, and the side wall 52. The cavity 50 connects to the upper ends of each heat exchange tube 3, and the side wall 52 is provided with a manhole 521 for maintenance personnel to enter and exit the cavity 50. Simultaneously, the fluid distribution plate 5 has multiple through holes 51 spaced apart for the tube-side medium to pass through. The diameter and number of through holes 51 are designed according to actual operating conditions.

[0035] An upper tube box 4, with a tube-side inlet connector 40 at the top, is positioned above a fluid distribution plate 5 and connects to a cavity 50 through a through hole 51 on the fluid distribution plate 5. A flow guide 6 is provided inside the upper tube box 4 to ensure that the tube-side medium entering from the tube-side inlet connector 40 is evenly distributed on the fluid distribution plate 5. The tube-side inlet connector 40 has a central portion and an outer portion surrounding the central portion. The flow guide 6 includes a flow guide cylinder 60, which is vertically positioned inside the upper tube box 4 and divides the internal space of the upper tube box 4 into a first portion 41 located within the inner perimeter of the flow guide cylinder 60 and a second portion 42 located outside the flow guide cylinder 60 and within the side wall of the upper tube box 4. The upper port of the first portion 41 corresponds to the central portion of the tube-side inlet connector 40 and is used to receive the tube-side medium passing through the central portion of the tube-side inlet connector 40. The upper port of the second portion 42 corresponds to the outer portion of the tube-side inlet connector 40 and is used to receive the tube-side medium passing through the outer portion of the tube-side inlet connector 40. The lower end of the guide tube 60 is supported on the fluid distribution plate 5, and the lower part of the guide tube 60 is provided with a plurality of small holes 61 spaced apart along the circumference to connect the first part 41 and the second part 42. In this embodiment, there are multiple guide tubes 60, which are coaxially sleeved along the inner and outer directions and arranged at intervals. Adjacent guide tubes 60 are connected by circumferentially spaced connecting members 62 (which are existing connecting ribs, such as...). Figure 3 (As shown) connected. Each guide tube 60 has a tapered portion 6a with a gradually increasing diameter from top to bottom, and a cylindrical portion 6b extending vertically downward from the lower end of the tapered portion 6a. The tapered portion 6a allows the tube-side medium to be evenly distributed in the circumferential direction. The axial length of the cylindrical portion 6b is less than the axial length of the tapered portion 6a, and as shown... Figure 1 , 2 As shown, the cylindrical portion 6b is provided with a plurality of small holes 61 spaced apart along the circumference, the diameter of the small holes 61 being smaller than the diameter of the through holes 51. The cylindrical portion 6b with small holes 61 allows the tube-side medium to flow between each guide tube and between the outermost guide tube and the side wall of the upper tube box, adjusting the radial uniformity of the tube-side medium.

[0036] The side wall shape of the upper tube box 4 is consistent with the shape of the guide tube 60, and the upper end of the side wall of the upper tube box 4 is provided with the aforementioned tube inlet pipe 40.

[0037] The aforementioned bend 7 is arc-shaped and is located above the pipe inlet connector 40. The first port at the top of the bend 7 is used for the input of the pipe medium, and the second port at the bottom of the bend 7 faces downward and is connected to the pipe inlet connector 40.

[0038] During heat exchange, the tube-side medium (such as gaseous medium) input through the bend 7 and the tube-side inlet pipe is first evenly distributed onto the fluid distribution plate 5 under the guidance of the flow guide. Then, it enters the cavity 50 through the through hole 51 on the fluid distribution plate 5 and enters the heat exchange tube 3 through the upper end of each heat exchange tube 3 to exchange heat with the shell-side medium. In this process, through the primary distribution of the flow guide 6 and the secondary distribution of the fluid distribution plate 5, the tube-side medium can flow evenly into each heat exchange tube 3, avoiding the tube-side medium deviation at the tube-side inlet pipe and affecting the heat exchange efficiency.

[0039] 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.

[0040] 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.

Claims

1. A wound tube heat exchanger, comprising: A vertically arranged shell-side cylindrical body (1); The upper tube sheet (2) is located at the upper end of the shell-side cylinder (1); Multiple heat exchange tubes (3) are arranged axially inside the shell-side cylinder (1), and the upper ends of the multiple heat exchange tubes (3) are supported on the upper tube sheet (2). The top of the pipe box (4) is equipped with a pipe inlet pipe (40); Its features It also includes: A fluid distribution plate (5) is horizontally placed above the upper tube sheet (2), and the edge of the fluid distribution plate (5) is joined with the edge of the upper tube sheet (2) to form a cavity (50) between the fluid distribution plate (5) and the upper tube sheet (2). The cavity (50) is connected to the upper end of the multiple heat exchange tubes (3). The fluid distribution plate (5) has multiple through holes (51) spaced apart for the tube-side medium to pass through. The upper tube box (4) is located above the fluid distribution plate (5) and is connected to the cavity (50) through the through hole (51) on the fluid distribution plate (5). The upper tube box (4) is provided with a flow guide (6) so that the tube medium entering from the tube inlet pipe (40) can be evenly distributed on the fluid distribution plate (5).

2. The wound tube heat exchanger according to claim 1, characterized in that: The edge of the fluid distribution plate (5) is joined to the edge of the upper tube plate (2) by a vertically extending side wall (52), and the side wall (52) is provided with a manhole (521) for maintenance personnel to enter and exit the cavity (50).

3. The wound tube heat exchanger according to claim 1, characterized in that: The inlet pipe (40) has a central section and an outer section located outside the central section; The flow guide (6) includes a flow guide cylinder (60), which is vertically disposed inside the upper tube box (4) and divides the internal space of the upper tube box (4) into a first part (41) located inside the flow guide cylinder (60) and a second part (42) located outside the flow guide cylinder (60) and inside the side wall of the upper tube box (4). The upper port of the first part (41) corresponds to the central part of the tube inlet connector (40), and the upper port of the second part (42) corresponds to the outer part of the tube inlet connector (40).

4. The wound tube heat exchanger according to claim 3, characterized in that: The lower end of the guide tube (60) is supported on the fluid distribution plate (5), and the lower part of the guide tube (60) is provided with a plurality of small holes (61) spaced apart along the circumference to connect the first part (41) and the second part (42).

5. The wound tube heat exchanger according to claim 4, characterized in that: The guide tube (60) has a tapered portion (6a) with a gradually increasing diameter from top to bottom, and a cylindrical portion (6b) extending vertically downward from the lower end of the tapered portion (6a). The cylindrical portion (6b) is provided with the aforementioned small hole (61).

6. The wound tube heat exchanger according to claim 5, characterized in that: The axial length of the cylindrical portion (6b) is less than the axial length of the conical portion (6a).

7. The wound tube heat exchanger according to claim 5, characterized in that: The side wall shape of the upper tube box (4) is consistent with the shape of the guide tube (60), and the upper end of the side wall of the upper tube box (4) is provided with the above-mentioned tube inlet pipe (40).

8. The wound tube heat exchanger according to claim 4, characterized in that: The diameter of the small hole (61) is smaller than the diameter of the through hole (51).

9. The wound tube heat exchanger according to claim 3, characterized in that: There are at least two guide tubes (60), which are sleeved in the inner and outer directions and arranged at intervals. Adjacent guide tubes (60) are connected by connectors (62) arranged at intervals in the circumferential direction.

10. The wound tube heat exchanger according to any one of claims 1 to 9, characterized in that: It also includes an arc-shaped bend (7), the first port of which is used for the input of the pipe-side medium, and the second port of which faces downward and is connected to the pipe-side inlet connector (40).

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