Wound tube type heat exchanger

Abstract

The utility model discloses a coiled tube type heat exchanger, which belongs to the technical field of heat exchange equipment and comprises a cylinder, two ends of the cylinder are provided with end sockets, and tube plates are arranged between the end sockets and the cylinder. Shell pass connectors are arranged at the two ends of the barrel; two ends of the heat exchange tube bundle are arranged on the tube plate; the heat exchange tube bundle comprises a tube winding section, two ends of the tube winding section are communicated with straight tube sections, and the straight tube sections are communicated with the end sockets through tube plates; the drainage cylinder sleeves the pipe winding section and is matched with the pipe winding section in length; the other end of the drainage cover is in sealed connection with the tube plate; a guide pipe for communicating the drainage cover with the shell pass interface is arranged on the drainage cover; the inner diameter of the drainage cover is not smaller than that of the drainage cylinder; one end of the drainage cylinder is fixed to the tube plate through the drainage cover, the distance between the drainage cylinder and the cylinder body and the distance between the drainage cylinder and the heat exchange tube bundle can be guaranteed, shell pass media can be drained to flow through the heat exchange tube bundle to the maximum extent, and heat exchange losses are reduced; the drainage cylinder can protect the heat exchange tube bundle, and the problem that the heat exchange tube bundle is damaged during assembly is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of heat exchange equipment, in particular to a coiled tube heat exchanger. Background Art

[0002] In the field of heat exchangers, when the equipment assembly space is limited, the shell-side flow rate is small, and the heat exchange requirements are high, it is necessary to use a heat exchanger with a small size, simple structure, tight shell-side heat exchange tube structure, and no leakage in the entire shell.

[0003] For this type of heat exchanger, in order to meet the heat exchange effect, if the traditional method of increasing the heat exchange area is used, the spatial structure will be increased, resulting in an increase in the cost of the heat exchanger, an increase in operating costs, and a decrease in energy efficiency, which cannot meet the use requirements of small heat exchangers; at this stage, the conventional solution is to make the heat exchange tube bundle in close contact and reduce the outer space. During the assembly process, the heat exchange tube bundle is easily damaged, resulting in a decrease in the life of the heat exchanger; further, for small heat exchangers, although the distance between the heat exchange tube bundle and the cylinder is small, some shell-side media will still flow out from the outside of the tube bundle, causing a short circuit problem in the heat exchanger; if a draft tube is used, because the distance is too small, the draft tube and the heat exchange tube bundle are easily damaged, and there will be some flow dead zones in the shell, and the heat exchange effect cannot be guaranteed.

[0004] Therefore, it is an urgent problem to be solved at this stage to develop and design a coiled tube heat exchanger that can effectively guide the shell-side medium to flow through the heat exchange tube bundle to the greatest extent, and can ensure the spacing between the guide tube and the cylinder body and the heat exchange tube bundle during the assembly process without damaging the heat exchange tube bundle. Utility Model Content

[0005] In order to solve the problems existing in the prior art, the utility model provides a coiled tube heat exchanger, in which the heat exchange tube bundle includes a coiled tube section and a straight tube section. The guide tube is sleeved on the outside of the coiled tube section. One end of the guide tube is fixed to the tube sheet through a guide cover, so as to ensure the spacing between the guide tube and the cylinder body and the heat exchange tube bundle. The guide tube and the guide cover can effectively guide the shell-side medium to flow through the heat exchange tube bundle to the maximum extent, thereby effectively reducing the heat exchange loss. Moreover, the guide tube can effectively protect the heat exchange tube bundle, thus solving the problem of damage to the heat exchange tube bundle during assembly and making installation more convenient.

[0006] In order to achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0007] The utility model provides a coiled tube heat exchanger, comprising:

[0008] A cylinder, both ends of the cylinder are provided with heads, a tube sheet is provided between the heads and the cylinder to separate the two; shell side interfaces are provided on the circumference of the cylinder near both ends;

[0009] A heat exchange tube bundle, wherein both ends of the heat exchange tube bundle are respectively arranged on the two tube sheets and are connected to the end cap; the heat exchange tube bundle comprises a winding tube section, both ends of the winding tube section are connected to a straight tube section, and the straight tube section is connected to the end cap through the tube sheet;

[0010] A drainage tube, which is sleeved on the outside of the winding pipe section; the length of the drainage tube matches the length of the winding pipe section;

[0011] A flow hood is sleeved on the outside of the heat exchange tube bundle, one end of the flow hood is sealed and connected to the flow tube, and the other end of the flow hood is sealed and connected to the tube sheet; a conduit is provided on the flow hood, and the conduit connects the flow hood with the shell side interface close to the flow hood; the inner diameter of the flow hood is not less than the inner diameter of the flow tube.

[0012] As a preferred technical solution, the shell side interface connected to the conduit rushes toward the straight pipe section, the length of the drainage cover matches the length of the straight pipe section, and one end of the drainage cover is connected to one end of the drainage tube;

[0013] Alternatively, the shell side interface connected to the conduit faces the winding pipe section, the drainage cover extends to the winding pipe section, part of the drainage tube extends into the drainage cover, and one end of the drainage cover is connected to the outer circumference of the drainage tube.

[0014] As a preferred technical solution, the guide hood is provided with a guide hole at a position close to the tube sheet.

[0015] As a preferred technical solution, the axis of the guide hole is perpendicular to the axis of the drainage tube;

[0016] Alternatively, the angle between the axis of the guide hole and the flow direction of the shell-side medium is an acute angle.

[0017] As a preferred technical solution, the drainage cover and the drainage tube are arranged to be connected in a nest edge or a cone shape;

[0018] And / or, the drainage cover is cylindrical or truncated cone-shaped.

[0019] As a preferred technical solution, the outer diameter of the drainage hood is smaller than the diameter of the tube sheet.

[0020] As a preferred technical solution, the inner diameter ratio of the drainage cover to the drainage tube is 1.3-1:1.

[0021] As a preferred technical solution, the distance between the drainage tube and the winding pipe section is smaller than the distance between the drainage tube and the cylinder body.

[0022] As a preferred technical solution, the cylinder is vertically arranged, and the drainage hood is located at the upper end of the cylinder.

[0023] As a preferred technical solution, the conduit is sealed and connected to the drainage cover and the shell side interface respectively;

[0024] And / or, the axis of the conduit is perpendicular to the axis of the cylinder.

[0025] The beneficial effects of the utility model are as follows:

[0026] 1. The tube sheet of the utility model separates the cylinder and the head, and the heat exchange tube bundle is connected with the head through the tube sheet to form a tube side; the area between the cylinder and the heat exchange tube bundle forms a shell side; the heat exchange tube bundle includes a winding tube section and a straight tube section, and the guide tube is sleeved on the outside of the winding tube section. One end of the guide tube is fixed to the tube sheet through a guide cover, which can ensure that the distance between the guide tube and the cylinder and the heat exchange tube bundle is stable. The guide tube and the guide cover can effectively guide the shell side medium to make it flow through the heat exchange tube bundle to the maximum extent, effectively reducing the heat exchange loss; and the guide tube and the guide cover can effectively protect the heat exchange tube bundle, solve the problem of heat exchange tube bundle damage during assembly, and installation is more convenient; the structure is compact, the space occupied is small, and the heat exchange effect advantage is obvious.

[0027] 2. The flow guide cover of the utility model is provided with a guide hole near the tube sheet, and the guide hole can facilitate the shell side medium to enter and flow out of the flow guide cover, which can solve the problem of flow dead zone to a certain extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the overall structure of a first embodiment of a coiled tube heat exchanger of the utility model;

[0029] Figure 2 for Figure 1 A magnified view of region A in FIG.

[0030] Figure 3 It is a schematic diagram of the overall structure of a second embodiment of a coiled tube heat exchanger of the utility model.

[0031] In the figure: 1-cylinder, 11-shell interface, 2-head, 3-tube sheet, 4-heat exchange tube bundle, 41-winding tube section, 42-straight tube section, 5-drainage tube, 6-drainage hood, 61-conduit, 62-guide hole. DETAILED DESCRIPTION

[0032] In order to facilitate understanding by those skilled in the art, the present invention is further described below in conjunction with the accompanying drawings.

[0033] Embodiment 1

[0034] Please refer to Figure 1 and Figure 2 , is an embodiment of a coil-wound heat exchanger provided by the utility model, comprising a vertically arranged cylinder 1, both ends of the cylinder 1 are provided with a head 2, a tube sheet 3 is provided between the head 2 and the cylinder 1 to separate the two, and both ends of the heat exchange tube bundle 4 are respectively arranged on two tube sheets 3 and connected with the head 2 to form a tube pass; the area between the cylinder 1 and the heat exchange tube bundle 4 forms a shell pass, and the circumferential surface of the cylinder 1 near its two ends is provided with a shell pass interface 11 connected with the shell pass; the heat exchange tube bundle 4 includes a coil section 41, a guide tube 5 is sleeved on the outside of the coil section 41, the guide tube 5 and the coil section 41 are clearance-matched to tightly wrap the coil section 41, and the length of the guide tube 5 matches the length of the coil section 41 to ensure that the shell-side medium can fully exchange heat with the coil section 41 when flowing through the guide tube 5; both ends of the coil section 41 are connected with a straight tube section 42, and the straight tube section 42 is connected to the shell through the tube sheet 3 The head 2 is connected, the drainage hood 6 is sleeved on the outside of the heat exchange tube bundle 4 and is located at the upper end of the cylinder 1, one end of the drainage hood 6 is sealed and connected with the drainage tube 5, and the other end of the drainage hood 6 is sealed and connected with the tube sheet 3, and the drainage hood 6 realizes the fixation between the drainage tube 5 and the tube sheet 3, which can ensure the stability of the spacing between the drainage tube 5 and the cylinder 1 and the heat exchange tube bundle 4 respectively; the drainage hood 6 is provided with a conduit 61, and the conduit 61 connects the drainage hood 6 with the shell side interface 11 close to the drainage hood 6. At the same time, the inner diameter of the drainage hood 6 should not be less than the inner diameter of the drainage tube 5. When the shell side medium enters the drainage hood 6 through the shell side interface 11, the drainage hood 6 and the drainage tube 5 can form an annular flow channel, reduce the scouring effect of the shell side medium on the heat exchange tube bundle 4 and evenly distribute the shell side medium, can effectively guide the shell side medium to make it flow through the heat exchange tube bundle 4 to the maximum extent, and effectively reduce the heat exchange loss.

[0035] For clarification, please refer to Figure 1 The drainage hood 6 and the drainage tube 5 are preferably arranged with a conical connection or a tapered connection, which can ensure the connection and sealing between the drainage hood 6 and the drainage tube 5; at the same time, the drainage hood 6 is preferably cylindrical or truncated cone-shaped, which facilitates the sealed connection between the drainage hood 6 and the drainage tube 5 while ensuring that the inner diameter of the drainage hood 6 is larger than the inner diameter of the drainage tube 5.

[0036] For further information, please refer to Figure 1 The distance between the draft tube 5 and the pipe winding section 41 should be smaller than the distance between the draft tube 5 and the cylinder body 1 to ensure that the shell-side medium fully passes through the pipe winding section 41 and improve the heat exchange effect; at the same time, the outer diameter of the draft hood 6 should be smaller than the diameter of the tube sheet 3 to facilitate fixing one end of the draft hood 6 on the tube sheet 3.

[0037] Specifically, the inner diameter ratio of the drainage hood 6 to the drainage tube 5 is preferably 1.3-1:1. The gap between the straight pipe section 42 and the drainage hood 6 is relatively large. After the shell-side medium enters the drainage hood 6 and collides with the straight pipe section 42, the flow velocity is reduced. Moreover, since the inner diameter of the drainage hood 6 is larger than that of the drainage tube 5, part of the flow velocity can be compensated.

[0038] In this embodiment, please refer to Figure 1 The shell-side interface 11 connected with the conduit 61 rushes toward the straight pipe section 42, the length of the drainage hood 6 matches the length of the straight pipe section 42, one end of the drainage hood 6 is connected to one end of the drainage cylinder 5, the conduit 61 is sealed and connected to the drainage hood 6 and the shell-side interface 11 respectively, the axis of the conduit 61 is perpendicular to the axis of the cylinder 1, and the drainage hood 6 and the shell-side interface 11 can be easily connected.

[0039] In this embodiment, please refer to Figure 2 A guide hole 62 is provided at the position of the guide cover 6 near the tube sheet 3. The shell-side medium can easily enter or flow out of the guide cover 6 through the guide hole 62, avoiding that the shell-side medium in some areas cannot participate in the main fluid flow, which can solve the problem of flow dead zone to a certain extent.

[0040] Based on the above examples, please refer to Figure 2 , the angle between the axis of the guide hole 62 and the flow direction of the shell-side medium is an acute angle. At this time, the main fluid flow direction of the shell-side medium is from bottom to top, and the shell-side medium outside the drainage cover 6 can flow in more smoothly from the outside of the drainage cover 6; in other embodiments, the axis of the guide hole 62 can also be perpendicular to the axis of the drainage tube 5, so that the shell-side medium can smoothly enter or flow out of the drainage cover 6.

[0041] Please refer to Figure 1 The specific usage of the utility model is as follows:

[0042] The shell side medium enters the shell side from the shell side interface 11 at the lower end, passes through the drainage tube 5, the drainage cover 6 and the conduit 61, and is discharged from the shell side interface 11 at the upper end to complete the heat exchange;

[0043] Alternatively, the shell-side medium can also be discharged from the shell-side interface 11 at the lower end through the conduit 61, the drainage cover 6, and the drainage tube 5 in the reverse direction from the upper shell-side interface 11 to complete the heat exchange.

[0044] It should be noted that when the gap between the heat exchange tube bundle 4 and the cylinder 1 is appropriate, the drainage hood 6 and the drainage tube 5 can also be connected by an overlap structure to ensure that the connection between the drainage hood 6 and the drainage tube 5 is sealed.

[0045] Embodiment 2

[0046] Please refer to Figure 3The main difference between this embodiment and the first embodiment is that the shell side interface 11 connected to the conduit 61 rushes toward the winding pipe section 41. At this time, the drainage cover 6 extends to the winding pipe section 41, and part of the drainage tube 5 extends into the drainage cover 6. One end of the drainage cover 6 is connected to the outer peripheral surface of the drainage tube 5. At this time, a more obvious annular flow channel can be formed between the drainage cover 6 and the drainage tube 5, which can further reduce the scouring effect of the shell side medium on the heat exchange tube bundle 4 and make the shell side medium more evenly distributed.

[0047] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A coiled tube heat exchanger, characterized in that: include: A cylinder (1), wherein both ends of the cylinder (1) are provided with a head (2), and a tube sheet (3) is provided between the head (2) and the cylinder (1) to separate the two; and shell side interfaces (11) are provided on the circumference of the cylinder (1) near both ends; A heat exchange tube bundle (4), wherein both ends of the heat exchange tube bundle (4) are respectively arranged on the two tube sheets (3) and are connected to the end cap (2); the heat exchange tube bundle (4) comprises a winding tube section (41), both ends of the winding tube section (41) are connected to a straight tube section (42), and the straight tube section (42) is connected to the end cap (2) through the tube sheet (3); A drainage tube (5), wherein the drainage tube (5) is sleeved on the outside of the winding pipe section (41); the length of the drainage tube (5) matches the length of the winding pipe section (41); A flow hood (6), wherein the flow hood (6) is sleeved on the outside of the heat exchange tube bundle (4), one end of the flow hood (6) is sealed and connected to the flow tube (5), and the other end of the flow hood (6) is sealed and connected to the tube sheet (3); a conduit (61) is provided on the flow hood (6), and the conduit (61) connects the flow hood (6) with the shell side interface (11) close to the flow hood (6); the inner diameter of the flow hood (6) is not less than the inner diameter of the flow tube (5).

2. A coiled heat exchanger according to claim 1, characterized in that: The shell side interface (11) connected to the conduit (61) faces the straight pipe section (42), the length of the drainage cover (6) matches the length of the straight pipe section (42), and one end of the drainage cover (6) is connected to one end of the drainage tube (5); Alternatively, the shell-side interface (11) connected to the conduit (61) is directed toward the pipe winding section (41), the drainage hood (6) extends to the pipe winding section (41), a portion of the drainage tube (5) extends into the drainage hood (6), and one end of the drainage hood (6) is connected to the outer peripheral surface of the drainage tube (5).

3. The coiled tube heat exchanger according to claim 1, characterized in that: The flow guide cover (6) is provided with a flow guide hole (62) at a position close to the tube plate (3).

4. A coiled heat exchanger according to claim 3, characterized in that: The axis of the guide hole (62) is perpendicular to the axis of the drainage tube (5); Alternatively, the angle between the axis of the guide hole (62) and the flow direction of the shell-side medium is an acute angle.

5. A coiled heat exchanger according to claim 1 or 2, characterized in that: The drainage cover (6) and the drainage tube (5) are arranged to be connected in a nest edge or a cone shape; And / or, the drainage cover (6) is cylindrical or truncated cone-shaped.

6. The coiled tube heat exchanger according to claim 1, characterized in that: The outer diameter of the flow guide cover (6) is smaller than the diameter of the tube sheet (3).

7. A coiled tube heat exchanger according to claim 1 or 6, characterized in that: The inner diameter ratio of the drainage cover (6) to the drainage tube (5) is 1.3-1:

1.

8. A coiled heat exchanger according to claim 7, characterized in that: The distance between the drainage tube (5) and the winding pipe section (41) is smaller than the distance between the drainage tube (5) and the cylinder body (1).

9. The coiled tube heat exchanger according to claim 1, characterized in that: The cylinder (1) is arranged vertically, and the drainage cover (6) is located at the upper end of the cylinder (1).

10. A coiled heat exchanger according to claim 1 or 2, characterized in that: The conduit (61) is sealedly connected to the drainage cover (6) and the shell side interface (11) respectively; And / or, the axis of the conduit (61) is perpendicular to the axis of the cylinder (1).

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