Winding pipe type heat exchanger

Abstract

A winding pipe type heat exchanger comprises a vertically-arranged shell pass barrel, a winding pipe and a winding pipe, the upper tube plate is arranged at the upper end part of the shell pass cylinder and is provided with a central part and a peripheral part positioned at the periphery of the central part; the upper tube box is arranged above the upper tube plate, and a tube pass inlet connecting tube is arranged at the position, corresponding to the central part of the upper tube plate, of the top of the upper tube box; the heat exchange tubes are arranged in the shell pass cylinder in the axial direction, the upper ends of the heat exchange tubes are supported on the central part and the peripheral part of the upper tube plate, and the heat exchange tubes are communicated with the upper tube box; the first guide cylinder is arranged in the upper tube box, the side peripheral wall of the first guide cylinder is a cone inclining outwards from top to bottom and is opposite to the side wall of the upper tube box at intervals, the top edge of the side peripheral wall is connected to form a closed cone head and is opposite to the tube pass inlet connecting tube, the bottom of the side peripheral wall is open, and the edge of the side peripheral wall is opposite to the peripheral part of the upper tube plate. First through holes are distributed in the side circumferential wall in the circumferential direction at intervals. According to the utility model, the tube pass medium entering the upper tube box can uniformly flow to each heat exchange tube.

Description

Technical Field

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

[0002] Existing wound tube heat exchangers, such as the utility model patent No. 201420757685.X "A Wrap-around Heat Exchanger with High Heat Exchange Efficiency" (authorization announcement No. CN204388658U), disclose a structure comprising a shell and an upper tube sheet, a lower tube sheet and a heat exchange tube arranged in the shell, the upper and lower ends of the heat exchange tube respectively pass through the upper and lower tube sheets to connect the upper tube box and the lower tube box, and the shell is provided with a shell-side inlet and a shell-side outlet; a support core is also provided in the shell, and the support core is limited on the upper and lower tube sheets; the heat exchange tube is a spiral corrugated tube, and there are multiple heat exchange tubes, which are divided into at least two groups, and each group of heat exchange tubes is spirally arranged inside and outside and coiled on the support core, and the spiral directions of the heat exchange tubes of adjacent groups are opposite.

[0003] Another example is the structure disclosed in the utility model patent "A wound tube heat exchanger for gas absorption" (authorization announcement number CN210057825U) with patent number 201920621066.0, which includes a shell-side cylinder; first and second tube sheets; first and second tube boxes; a central cylinder; a heat exchange tube; a gas pipe connection 1 and a gas pipe connection 2; an absorption liquid inlet and outlet pipe connections; a distribution plate and a uniform distribution device, wherein the distribution plate is transversely arranged in the shell-side cylinder and located at the upper part of the shell-side cylinder, and a plurality of through holes for the heat exchange tubes to pass through are opened on the distribution plate, and a gap is provided between the inner wall of the through hole and the outer wall of the heat exchange tube so that the absorption liquid can form a liquid film on the outer wall of the heat exchange tube; the uniform distribution device is arranged in the shell-side cylinder and located at the lower side of the distribution plate, so as to evenly distribute the absorption liquid on the lower side of the distribution plate on the heat exchange tube again to form a liquid film; the absorption liquid inlet pipe connection and the gas pipe connection 1 are arranged on the upper part of the shell-side cylinder and are respectively located on the upper and lower sides of the distribution plate, and the absorption liquid outlet pipe connection and the gas pipe connection 2 are arranged at the lower part of the shell-side cylinder.

[0004] Nowadays, with the large-scale heat exchangers, the diameter of the tube sheet on the heat exchanger is larger, while the tube inlet pipe on the tube box is relatively small, so that the tube medium entering the tube box from the tube inlet pipe cannot flow evenly to each heat exchange tube, thus affecting the heat exchange efficiency. Utility Model Content

[0005] The technical problem to be solved by the utility model is to provide a wound tube heat exchanger in view of the current status of the prior art, so that the tube-side medium entering the upper tube box can flow evenly to each heat exchange tube.

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

[0007] A vertically arranged shell-side cylinder body;

[0008] An upper tube sheet, arranged at the upper end of the shell-side cylinder body, and having a central part and an outer peripheral part located outside the central part;

[0009] An upper tube box, arranged above the upper tube sheet, and a tube-side inlet nozzle is arranged at the position corresponding to the central part of the upper tube sheet at the top thereof;

[0010] Multiple heat exchange tubes, axially arranged in the shell-side cylinder body, and the upper ends of the multiple heat exchange tubes are supported on the central part and the outer peripheral part of the upper tube sheet and communicate with the upper tube box;

[0011] It is characterized in that it further includes:

[0012] A first guide cylinder with a hollow interior, arranged in the upper tube box, and the side peripheral wall thereof is a cone inclined outward from top to bottom and is spaced relative to the side wall of the upper tube box. The top edge of the side peripheral wall is connected to form a closed cone head, which is opposite to the tube-side inlet nozzle. The bottom of the side peripheral wall is open and the edge is opposite to the outer peripheral part of the upper tube sheet, and first through holes for the tube-side medium to pass through are circumferentially and spacedly distributed on the side peripheral wall.

[0013] In this way, after the tube-side medium enters the upper tube box through the tube-side inlet nozzle, it can flow downward along the side peripheral wall of the first guide cylinder. During the flowing process, a part of the tube-side medium enters the first guide cylinder through the first through holes, then flows to the central part of the upper tube sheet and enters the heat exchange tubes supported on the central part; another part of the tube-side medium flows downward along the side peripheral wall of the first guide cylinder to the outer peripheral part of the upper tube sheet and enters the heat exchange tubes supported on the outer peripheral part. In this way, the tube-side medium entering the upper tube box can evenly flow to each heat exchange tube. And in the present utility model, the guide cylinder in the shape of a cone can play a role in avoiding the formation of vortices or turbulent flows of the tube-side medium.

[0014] Preferably, the inclination angle of the side peripheral wall relative to the vertical plane is denoted as α, and α < 45°. The lower limit of the inclination angle α is greater than 0°, and it is ensured that the bottom edge of the side peripheral wall is opposite to the outer peripheral part of the upper tube sheet.

[0015] Preferably, the first through holes spaced circumferentially are taken as a group, and there are at least two groups, and they are spacedly arranged in the up and down directions.

[0016] Preferably, the cone head of the first guide cylinder is in a spherical crown shape, and second through holes for the tube-side medium to pass through are spacedly distributed thereon.

[0017] Furthermore, the radius of the cone head of the first guide cylinder is not less than 200 mm.

[0018] Further, the bottom edge of the side peripheral wall of the first flow guide cylinder extends downward to form a straight cylinder body, the lower end edge of the straight cylinder body is supported on the outer peripheral part of the upper tube sheet, and third through holes for the tube-side medium to pass through are circumferentially arranged at intervals on the side annular wall of the straight cylinder body. The design of the straight cylinder body is determined according to the flow field calculation, and the straight cylinder body may not be provided. In this case, the bottom edge of the side peripheral wall of the first flow guide cylinder is directly supported on the outer peripheral part of the upper tube sheet.

[0019] In the above-mentioned various solutions, preferably, the central part of the upper tube sheet has a first part located at the center and a second part located outside the first part;

[0020] It further includes a central cylinder, which is axially arranged in the shell-side cylinder body, and the upper end of the central cylinder is opposite to and connected with the first part of the upper tube sheet;

[0021] A plurality of heat exchange tubes are spirally wound around the outer periphery of the central cylinder along the axis, and the upper ends of the plurality of heat exchange tubes are supported on the second part and the outer peripheral part of the upper tube sheet;

[0022] It further includes a second flow guide cylinder, which is arranged in the first flow guide cylinder and shields above the first part of the upper tube sheet, and the shape of the second flow guide cylinder is a cone matching the shape of the first flow guide cylinder to guide the tube-side medium falling on the second flow guide cylinder to the second part of the upper tube sheet.

[0023] The design of the second flow guide cylinder can prevent the tube-side medium from flowing to the first part of the upper tube sheet, thereby avoiding the formation of vortices or turbulent flows in the non-opening area (i.e., the first part of the upper tube sheet), so that the fluid can flow evenly to each heat exchange tube.

[0024] Preferably, the side wall of the upper tube box is a cone that slopes outward from top to bottom.

[0025] Preferably, the first through holes on the first flow guide cylinder are circular or waist-shaped. In addition, the first through holes can also be other shapes such as oval, and the shape and distribution law of the first through holes are designed according to the actual flow field.

[0026] Compared with the prior art, the advantages of the present utility model are as follows: by arranging the first flow guide cylinder in the upper tube box, after the tube-side medium enters the upper tube box through the tube-side inlet nozzle, it can flow downward along the side peripheral wall of the first flow guide cylinder. During the flowing process, a part of the tube-side medium enters the first flow guide cylinder through the first through holes, then flows to the central part of the upper tube sheet and enters the heat exchange tubes supported on the central part; another part of the tube-side medium flows downward along the side peripheral wall of the first flow guide cylinder to the outer peripheral part of the upper tube sheet and enters the heat exchange tubes supported on the outer peripheral part. In this way, the tube-side medium entering the upper tube box can flow evenly to each heat exchange tube. And the conical flow guide cylinder in the present utility model can play a role in preventing the tube-side medium from forming vortices or turbulent flows. Brief Description of the Drawings

[0027] Figure 1 It is a partial structural schematic diagram of the first embodiment of the present utility model;

[0028] Figure 2 is Figure 1 a partial enlarged view;

[0029] Figure 3 is Figure 2 an enlarged view of part A in;

[0030] Figure 4 It is a top view of the first flow guide cylinder in the first embodiment of the present utility model;

[0031] Figure 5 It is a top view of the first flow guide cylinder in the second embodiment of the present utility model. Detailed Description of the Embodiments

[0032] The present utility model will be further described in detail below in conjunction with the embodiments with reference to the drawings.

[0033] Embodiment 1:

[0034] As Figures 1 to 4 shown, it is a preferred Embodiment 1 of a wound tube heat exchanger of the present utility model. The wound tube heat exchanger includes a shell side cylinder 150, an upper tube sheet 160, an upper tube box 161, a central cylinder 730, heat exchange tubes 200, and a flow guide cylinder.

[0035] Among them, the shell side cylinder 150 is arranged vertically.

[0036] The upper tube sheet 160 is arranged at the upper end of the shell side cylinder 150, and has a first part 161a located at the center, a second part 162a located outside the first part 161a, and an outer peripheral part 16b located outside the second part 162a. The first part 161a and the second part 162a are denoted as the central part 16a. Among them, the first part 161a is a non-opening part without through holes, and the second part 162a and the outer peripheral part 16b are both opening parts with a plurality of through holes distributed.

[0037] The upper tube box 161 is arranged above the upper tube sheet 160, and a tube side inlet nozzle 110 is provided at the top corresponding to the position of the central part 16a of the upper tube sheet 160 for inputting tube side medium. The side wall of the upper tube box 161 is in a conical shape that slopes outward from top to bottom.

[0038] The above-mentioned central cylinder 730 is arranged axially in the shell side cylinder 150, and the upper end of the central cylinder 730 is opposite to and connected with the first part 161a of the upper tube sheet 160.

[0039] A plurality of heat exchange tubes 200 are arranged in the shell-side cylinder body 150 and spirally wound around the outer periphery of the central cylinder 730 along the axial direction. The upper ends of the plurality of heat exchange tubes 200 are supported on the second part 162a and the outer peripheral part 16b of the upper tube sheet 160, and communicate with the upper tube box 161 through corresponding through holes on the second part 162a and the outer peripheral part 16b.

[0040] There are two such flow guide cylinders, namely a first flow guide cylinder 710 and a second flow guide cylinder 720. The inside of the first flow guide cylinder 710 is hollow and is arranged in the upper tube box 161. The side peripheral wall 711 of the first flow guide cylinder 710 is a cone inclined outward from top to bottom and is spaced opposite to the side wall of the upper tube box 161. The inclination angle α of the side peripheral wall 711 relative to the vertical plane is < 45°. At the same time, circular first through holes 713 for the tube-side medium to pass through are distributed at intervals in the circumferential direction on the side peripheral wall 711. Taking the first through holes 713 distributed at intervals in the circumferential direction as a group, there are at least two groups, and they are arranged at intervals in the up and down direction. The top edge of the side peripheral wall 711 is connected to form a closed conical head 712, which is opposite to the tube-side inlet nozzle 110. The conical head 712 is in the shape of a spherical crown with a radius of not less than 200 mm, and circular second through holes 714 for the tube-side medium to pass through are distributed at intervals on the conical head 712. And the lower edge of the conical head 712 is tangent to the upper edge of the side peripheral wall 711. The bottom of the side peripheral wall 711 is open, and the bottom edge of the side peripheral wall 711 extends downward to form a straight cylinder 715. The lower edge of the straight cylinder 715 is supported on the outer peripheral part 16b of the upper tube sheet 160, and third through holes 716 for the tube-side medium to pass through are arranged at intervals in the circumferential direction on the side annular wall of the straight cylinder 715.

[0041] The above-mentioned second flow guide cylinder 720 is arranged in the first flow guide cylinder 710 and shields above the first part 161a of the upper tube sheet 160. The shape of the second flow guide cylinder 720 is a cone matching the shape of the first flow guide cylinder 710 to guide the tube-side medium falling on the second flow guide cylinder 720 onto the second part 162a of the upper tube sheet 160.

[0042] In use, when the shell-side medium enters the upper shell header 161 through the shell-side inlet nozzle 110, it can pass through the cone head 712 at the top of the first guide cylinder 710, and then flow downward along the side wall 711 of the first guide cylinder 710. During the flowing process, a part of the shell-side medium enters the first guide cylinder 710 through the second through-hole 714 on the cone head 712 and the first through-hole 713 on the side wall 711; another part of the shell-side medium flows downward along the side wall 711 of the first guide cylinder 710 to the outer peripheral part 16b of the upper tube sheet 160 and enters the heat exchange tubes 200 supported on the outer peripheral part 16b. And the shell-side medium entering the first guide cylinder 710 either directly flows to the second part 162a of the upper tube sheet or flows to the second part 162a of the upper tube sheet along the side wall of the second guide cylinder 720 and enters the heat exchange tubes supported on the second part 162a; thus, the shell-side medium entering the upper shell header can flow evenly to each heat exchange tube. And in this embodiment, the guide cylinder in the shape of a cone can play a role in preventing the shell-side medium from forming vortices or turbulent flows.

[0043] Embodiment Two:

[0044] As Figure 5 shown, it is the second preferred embodiment of a wound tube heat exchanger of the present utility model. This embodiment is basically the same as Embodiment One, except that the first through-hole 713 on the side wall 711 of the first guide cylinder, the second through-hole 714 on the cone head 712, and the third through-hole 716 on the straight cylinder 715 in this embodiment are all waist-shaped.

Claims

1. A wound tube heat exchanger, comprising: A shell-side cylinder (150) disposed vertically; An upper tube plate (160) is disposed at the upper end of the shell-side cylinder (150) and comprises a central portion (16a) and a peripheral portion (16b) located outside the central portion (16a); The upper tube box (161) is arranged above the upper tube plate (160), and a tube pass inlet pipe (110) is arranged at the top of the upper tube box at a position corresponding to the central part (16a) of the upper tube plate (160); A plurality of heat exchange tubes (200) are axially arranged in the shell-side cylinder (150), and the upper ends of the plurality of heat exchange tubes (200) are supported on the central portion (16a) and the peripheral portion (16b) of the upper tube plate (160) and are connected to the upper tube box (161); Features Also included are: A first flow guide cylinder (710) having a hollow interior is arranged in the upper tube box (161), and its side peripheral wall (711) is a cone inclined outward from top to bottom and is spaced apart from the side wall of the upper tube box (161). The top edge of the side peripheral wall (711) is connected to form a closed cone head (712) and is opposite to the tube side inlet pipe (110). The bottom of the side peripheral wall (711) is open and the edge is opposite to the outer peripheral part (16b) of the upper tube plate (160). The side peripheral wall (711) is provided with first through holes (713) spaced apart along the circumferential direction for the tube side medium to pass through.

2. The wound tube heat exchanger according to claim 1, characterized in that: The inclination angle of the side peripheral wall (711) relative to the vertical plane is α, and α is less than 45°.

3. The wound tube heat exchanger according to claim 1, characterized in that: The first through holes (713) distributed at intervals in the circumferential direction form a group, there are at least two groups, and are arranged at intervals in the up-down direction.

4. The wound tube heat exchanger according to claim 1, characterized in that: The cone head (712) of the first guide tube (710) is in the shape of a spherical crown, and second through holes (714) for the pipe-side medium to pass through are arranged at intervals thereon.

5. The wound tube heat exchanger according to claim 4, characterized in that: The radius of the cone head (712) of the first guide tube (710) is not less than 200 mm.

6. The wound tube heat exchanger according to claim 1, characterized in that: The bottom edge of the side circumferential wall (711) of the first guide tube (710) extends downward to form a straight cylindrical body (715), the lower end edge of the straight cylindrical body (715) is supported on the outer peripheral portion (16b) of the upper tube plate (160), and third through holes (716) for the passage of the tube-side medium are provided at intervals along the circumferential direction on the side circumferential wall of the straight cylindrical body (715).

7. The wound tube heat exchanger according to any one of claims 1 to 6, characterized in that: The central portion (16a) of the upper tube plate (160) has a first portion (161a) located at the center and a second portion (162a) located at the periphery of the first portion (161a); It also includes a center tube (730) which is axially arranged in the shell-side cylinder (150), and the upper end of the center tube (730) is opposite to and connected to the first part (161a) of the upper tube plate (160); A plurality of heat exchange tubes (200) are spirally wound around the outer periphery of the central tube (730) along the axial direction, and the upper ends of the plurality of heat exchange tubes (200) are supported on the second portion (162a) and the outer peripheral portion (16b) of the upper tube plate (160); The invention also includes a second flow guide tube (720) which is arranged in the first flow guide tube (710) and blocks the first portion (161a) of the upper tube plate (160). The shape of the second flow guide tube (720) is a cone that matches the shape of the first flow guide tube (710) so as to guide the tube-side medium falling on the second flow guide tube (720) to the second portion (162a) of the upper tube plate (160).

8. The wound tube heat exchanger according to any one of claims 1 to 6, characterized in that: The side wall of the upper tube box (161) is in a cone shape that inclines outward from top to bottom.

9. The wound tube heat exchanger according to any one of claims 1 to 6, characterized in that: The first through hole (713) on the first guide tube (710) is circular or waist-shaped.

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