Special winding pipe type heat exchanger

Abstract

The utility model provides a special winding pipe type heat exchanger which comprises a cylindrical shell, an external heat exchange pipe bundle is wound in the shell, the two ends of the external heat exchange pipe bundle are conically shrunk to form carding sections, binding barrels are further arranged at the two ends of the shell respectively, and the binding barrels are of conical barrel structures matched with the carding sections in shape and are arranged outside the carding sections in a sleeved mode. A closed space is formed between the outer side of the binding cylinder and the inner walls of the two ends of the shell, and the binding cylinder is further provided with an opening area for fluid to pass through. Fluid used for heat exchange can only flow in the axial direction of the binding barrel after entering the binding barrel, a stable and more regular heat exchange contact face is achieved, and the liquid in the carding section has a better heat exchange effect. And a central cylinder and an internal heat exchange tube bundle which are coaxial are also arranged in the shell, so that the internal space of the shell is further utilized, and the space utilization rate and the heat exchange efficiency in unit space are increased.

Description

Technical Field

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

[0002] Spiral Wounded Heat Exchanger is a highly efficient and compact heat exchanger that can not only utilize waste heat, but also plays an important role in energy conservation and environmental protection. The heat exchanger has a complex structure, high cost, and is located in the key part of the device. Compared with ordinary shell-and-tube heat exchangers, it has incomparable advantages, such as wide applicable temperature range, adaptability to thermal shock, self-elimination of thermal stress, high compactness, and due to its special structure, the flow field is fully developed and there is no dead zone of flow.

[0003] The wound heat exchanger is formed by alternately winding the heat transfer tube in a spiral shape in the space between the core tube and the outer tube. The spiral directions of the two adjacent layers of spiral heat transfer tubes are opposite, and a certain shape of distance pieces are used to maintain a certain distance. The wound tube heat exchanger is suitable for processing multiple media at the same time, and needs to transfer a large amount of heat under a small temperature difference and the operating pressure of the medium in the tube is high, such as heat exchange equipment used in low-temperature processes such as oxygen production.

[0004] The existing wound heat exchanger usually includes an outer shell and an external heat exchange tube bundle arranged inside the outer shell, wherein the outer shell is a cylindrical structure, and the external heat exchange tube bundle is reciprocatedly wound inside the outer shell and penetrates from the end of the outer shell. Obviously, considering the shape of the outer shell, the parts of the external heat exchange tube bundle at both ends of the outer shell need to be separated from the state of spiral winding with each other and shrink to parallel straight tube bundles in order to pass through the outer shell shell along the axial direction or radial direction of the outer shell and leave, so a shrink combing section will be formed at both ends of the outer shell. This combing section is the connecting section between the heat exchange area of ​​the external heat exchange tube bundle and the outer pipe of the outer shell. Although the fluid used for heat exchange inside the outer shell will also pass through the combing section, the combing section is a contraction structure, and the flow direction of the fluid at the corresponding fluid inlet and outlet at both ends of the outer shell is not along the axial direction of the outer shell, so that the flow direction of the heat exchange fluid at the combing section and the flow direction of the liquid in the heat exchange tube of the combing section are greatly different and lack regularity, resulting in poor heat exchange effect, which is usually not included in the effective heat exchange area of ​​the heat exchanger, resulting in insufficient utilization of the heat exchange area. Utility Model Content

[0005] In view of the deficiencies in the prior art, the utility model provides a special wound tube heat exchanger, which solves the problem in the prior art that the shape of the combing section does not match the shape of the outer shell, resulting in poor heat exchange effect and cannot be included in the effective heat exchange area of ​​the heat exchanger, resulting in insufficient utilization of the heat exchange area.

[0006] According to an embodiment of the utility model, a special wound tube heat exchanger comprises a cylindrical shell, wherein two ends of the shell are respectively provided with a tube bundle inlet and a tube bundle outlet, and the sides of the shell are respectively provided with a fluid inlet and a fluid outlet near the two ends, and an external heat exchange tube bundle is wound inside the shell, and the two ends of the external heat exchange tube bundle are conically contracted to form a combing section, and the end with a smaller diameter of the combing section is connected to the tube bundle inlet and the tube bundle outlet, and two ends of the shell are respectively provided with a wrapping cylinder, and the wrapping cylinder is a conical cylinder structure matching the shape of the combing section, so that the wrapping cylinder is just sleeved on the outside of the combing section at both ends of the external heat exchange tube bundle, and the two ends of the wrapping cylinder are respectively sealed and connected to the inner wall of the shell to form a closed space between the outer side of the wrapping cylinder and the inner wall at both ends of the shell, and the fluid inlet and the fluid outlet are respectively connected to the closed space at both ends of the shell, and the wrapping cylinder is also provided with an opening area for fluid to pass through.

[0007] Furthermore, a central tube is coaxially arranged inside the shell, and both ends of the central tube are closed and respectively abut against the tube bundle inlet and the tube bundle outlet, and the diameter of the central tube is smaller than the minimum diameter of the wrapping tube, and the external heat exchange tube bundle is arranged between the shell and the central tube, and between the wrapping tube and the central tube.

[0008] Furthermore, an internal heat exchange tube bundle is provided inside the central tube, and both ends of the internal heat exchange tube bundle pass through the central tube and are connected to the tube bundle inlet and the tube bundle outlet. Fluid flow holes are also provided on the areas corresponding to the wrapping tubes at both ends of the central tube.

[0009] Furthermore, the opening area is a plurality of arc-shaped holes circumferentially surrounding the axis of the dressing tube, or a plurality of strip-shaped holes arranged in parallel to the axial direction, or dot-matrix circular holes arranged in a square array.

[0010] Furthermore, the fluid flow holes are a plurality of strip holes which are parallel to the axial direction of the central tube and are arranged around the central tube.

[0011] Furthermore, a connection port located outside the opening area is provided on the dressing tube corresponding to the fluid flow hole, and a closed connection pipe is provided between the connection port and the fluid flow hole, so that the fluid located outside the dressing tube can directly flow into the interior of the central tube.

[0012] Compared with the prior art, the utility model has the following beneficial effects:

[0013] 1. In the utility model, a wrapping cylinder is provided at both ends of the shell corresponding to the combing section, wherein the shape of the wrapping cylinder is a conical cylinder structure corresponding to the combing section, so that it just covers the outside of the combing section, so that the external heat exchange tube bundle, whether it is located in the middle of the shell or the combing sections at both ends, is tightly fitted with the inner wall of the shell and the inner wall of the wrapping cylinder, so that the fluid used for heat exchange can only flow along the axial direction of the wrapping cylinder after entering the inside of the wrapping cylinder, thereby ensuring the direction consistency with the fluid in other areas inside the shell, and at the same time being parallel to the flow direction of the liquid inside the combing section, with a stable and more regular heat exchange contact surface, so that the liquid in the combing section has a better heat exchange effect, and finally improves the utilization rate of the heat exchange area, and increases the total heat exchange area inside the heat exchanger;

[0014] 2. The utility model also arranges a coaxial central tube inside the shell. Since a certain space will be left in the center of the external heat exchange tube bundle of the traditional wound tube heat exchanger after spiral winding, the utility model fills this space through the central tube and arranges an internal heat exchange tube bundle inside the central tube, thereby further utilizing the internal space of the shell, increasing the space utilization rate and the heat exchange efficiency per unit space. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the axial structure of Example 1 of the utility model.

[0016] Figure 2 It is a schematic diagram of the opening area on the wrapping tube in Example 1 of the utility model.

[0017] Figure 3 It is a schematic diagram of the opening area on the wrapping tube in Example 2 of the utility model.

[0018] Figure 4 It is a schematic diagram of the opening area on the wrapping tube in Example 3 of the utility model.

[0019] Figure 5 This is a schematic diagram of the fluid flow holes on the central tube of Example 1 of the utility model.

[0020] Figure 6 This is a schematic diagram of a radial cross-section of the shell at the fluid inlet of Example 4 of the utility model.

[0021] In the above drawings: 1, shell; 2, external heat exchange tube bundle; 3, combing section; 4, wrapping tube; 5, center tube; 6, internal heat exchange tube bundle; 7, connecting tube; 11, tube bundle inlet; 12, tube bundle outlet; 13, fluid inlet; 14, fluid outlet; 15, closed space; 41, opening area; 42, connecting port; 51, fluid flow hole. DETAILED DESCRIPTION

[0022] The technical solution of the present utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0023] Embodiment 1:

[0024] like Figure 1 As shown, the embodiment of the utility model proposes a special wound tube heat exchanger, including a cylindrical shell 1, the two end surfaces of the shell 1 are respectively convex arc surface convergence, the two end surfaces of the shell 1 are respectively provided with a tube bundle inlet 11 and a tube bundle outlet 12, and the side of the shell 1 near the two ends is respectively provided with a fluid inlet 13 and a fluid outlet 14. An external heat exchange tube bundle 2 is wound inside the shell 1, and the two ends of the external heat exchange tube bundle 2 are conically contracted to form a combing section 3, and the end of the combing section 3 with a smaller diameter is connected to the tube bundle inlet 11 and the tube bundle outlet 12, that is, the external heat exchange tube bundle 2 and the axis of the shell 1 enter the shell 1 in parallel with each other, and then a spiral winding structure is formed inside the shell 1.

[0025] In this embodiment, a wrapping tube 4 is provided at both ends of the shell 1, and the wrapping tube 4 is a conical tube structure that matches the shape of the combing section 3, so that the two wrapping tubes 4 are just sleeved on the outside of the combing section 3 at both ends of the external heat exchange tube bundle 2, and the two ends of the wrapping tube 4 are respectively sealed and connected to the inner wall of the shell 1, forming a closed space 15 between the outer side of the wrapping tube 4 and the inner wall at both ends of the shell 1. That is, in this embodiment, the end with a larger diameter of the wrapping tube 4 is connected to the connection between the inner side wall and the end face of the shell 1, and the end with a smaller diameter of the wrapping tube 4 extends to the end face of the shell 1 and is just connected to the tube bundle inlet 11 and the tube bundle outlet 12. The fluid inlet 13 and the fluid outlet 14 are respectively connected to the closed spaces 15 at both ends of the shell 1. The wrapping tube 4 is also provided with an opening area 41 for the fluid to pass through. Therefore, after the fluid enters the shell 1, it first fills the closed space 15, and then enters the wrapping tube 4 through the opening area 41 to contact the external heat exchange tube bundle 2. The shape of the wrapping tube 4 is used to limit the flow direction of the fluid, so that it can move regularly relative to the external heat exchange tube bundle 2 in the combing section 3, thereby playing an effective heat exchange function.

[0026] like Figure 2 As shown, in a preferred embodiment, the opening area 41 is a plurality of arc-shaped holes circumferentially surrounding the axis of the dressing tube 4. In this embodiment, two symmetrical arc-shaped holes are provided so that the fluid can enter the interior of the dressing tube 4 evenly.

[0027] In this embodiment, the shell 1 is further provided with a central tube 5 coaxially, the two ends of the central tube 5 are closed and respectively abut against the tube bundle inlet 11 and the tube bundle outlet 12, the diameter of the central tube 5 is smaller than the minimum diameter of the wrapping tube 4, and the external heat exchange tube bundle 2 is provided between the shell 1 and the central tube 5, and between the wrapping tube 4 and the central tube 5. That is, the external heat exchange tube bundle 2 is spirally wound around the central tube 5, and the winding thickness is matched with the spacing between the inner diameter of the shell 1 and the outer diameter of the central tube 5. Correspondingly, the central tube 5 is further provided with an internal heat exchange tube bundle 6, the two ends of the internal heat exchange tube bundle 6 penetrate the central tube 5 and are connected to the tube bundle inlet 11 and the tube bundle outlet 12, and the two ends of the central tube 5 corresponding to the wrapping tube 4 are further provided with fluid flow holes 51.

[0028] like Figure 5 As shown, further, the fluid flow holes 51 are a plurality of strip holes parallel to the axial direction of the central tube 5 and arranged around the central tube 5. After the fluid enters the shell 1, it first flows into the binding tube 4 through the opening area 41 from the closed space 15, and then flows into the central tube 5 through the fluid flow holes 51 to exchange heat with the internal heat exchange tube bundle 6.

[0029] Embodiment 2:

[0030] like Figure 3 As shown, the rest of the present embodiment is the same as that of the embodiment 1, except that the opening area 41 is a plurality of strip holes arranged parallel to the axial direction. Preferably, two groups of seven strip holes are provided symmetrically in the present embodiment, which can further increase the flow rate of the opening area 41 and allow the fluid to enter the inside of the dressing tube 4 faster.

[0031] Embodiment 3:

[0032] like Figure 4 As shown, the rest of the present embodiment is the same as that of the embodiment 1, except that the opening area 41 is a dot matrix circular hole arranged in a square array. In the present embodiment, two groups of 6*5 dot matrix circular holes are provided which are symmetrical to each other. Through the dot matrix circular holes, the fluid can enter more evenly while maintaining a large fluid flux, thereby avoiding a large temperature difference of the fluid in the dressing tube 4, thereby achieving a better heat exchange effect.

[0033] Embodiment 4:

[0034] like Figure 6As shown, the rest of the present embodiment is the same as that of the embodiment 1, except that: the wrapping tube 4 is provided with a connection port 42 located outside the opening area 41 corresponding to the fluid flow hole 51, and a closed connection pipe 7 is provided between the connection port 42 and the fluid flow hole 51, so that the fluid located outside the wrapping tube 4 can directly pass into the center tube 5. Through the connection pipe 7, the fluid can directly enter the center tube 5 from the closed space 15 without the need to pass through the wrapping tube 4, so the fluid will not change temperature due to passing through the wrapping tube 4, so that it can directly contact with the internal heat exchange tube bundle 6, achieving a better heat exchange effect.

[0035] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A special wound tube heat exchanger, comprising a cylindrical shell, wherein the two ends of the shell are respectively provided with a tube bundle inlet and a tube bundle outlet, and the sides of the shell are respectively provided with a fluid inlet and a fluid outlet near the two ends, and an external heat exchange tube bundle is wound inside the shell, and the two ends of the external heat exchange tube bundle are conically contracted to form a combing section, and the end with a smaller diameter of the combing section is connected to the tube bundle inlet and the tube bundle outlet, characterized in that: The shell is also provided with a wrapping tube at both ends. The wrapping tube is a conical tube structure that matches the shape of the combing section, so that the wrapping tube is just sleeved on the outside of the combing section at both ends of the external heat exchange tube bundle, and the two ends of the wrapping tube are respectively sealed and connected to the inner wall of the shell to form a closed space between the outer side of the wrapping tube and the inner wall at both ends of the shell. The fluid inlet and the fluid outlet are respectively connected to the closed space at both ends of the shell, and the wrapping tube is also provided with an opening area for the fluid to pass through.

2. A special wound tube heat exchanger according to claim 1, characterized in that: A central tube is coaxially arranged inside the shell, and both ends of the central tube are closed and respectively abut against the tube bundle inlet and the tube bundle outlet. The diameter of the central tube is smaller than the minimum diameter of the wrapping tube. The external heat exchange tube bundle is arranged between the shell and the central tube, and between the wrapping tube and the central tube.

3. A special wound tube heat exchanger as claimed in claim 2, characterized in that: An internal heat exchange tube bundle is also arranged inside the central tube. Both ends of the internal heat exchange tube bundle pass through the central tube and are connected to the tube bundle inlet and the tube bundle outlet. Fluid flow holes are also arranged on the areas at both ends of the central tube corresponding to the wrapping tube.

4. A special wound tube heat exchanger according to claim 1, characterized in that: The opening area is a plurality of arc-shaped holes circumferentially surrounding the axis of the dressing tube, or a plurality of strip-shaped holes arranged in parallel to the axial direction, or dot-matrix circular holes arranged in a square array.

5. A special wound tube heat exchanger as claimed in claim 3, characterized in that: The fluid flow holes are a plurality of strip holes which are parallel to the axial direction of the central tube and are arranged around the central tube.

6. A special wound tube heat exchanger as claimed in claim 3, characterized in that: The dressing tube is provided with a connection port outside the opening area corresponding to the fluid flow hole, and a closed connection pipe is provided between the connection port and the fluid flow hole, so that the fluid outside the dressing tube can directly flow into the interior of the central tube.

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