Fin type double-pipe heat exchanger
Through the design of the fin casing heat exchanger, the inner fin divides the fluid area to increase the flow rate and turbulent state, and the outer fin increases the air contact area, solving the problem of insufficient heat transfer capacity of traditional heat exchangers and achieving efficient heat exchange effect.
Patent Information
- Application Number
- CN202422625280.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-30
- Publication Date
- 2025-07-08
- Estimated Expiration
- 2034-10-30
AI Technical Summary
The heat exchange capacity of traditional heat exchangers can no longer meet the growing industrial demand, especially in the complex process of heat exchange in chemical, petroleum, electricity, metallurgy and other fields, and heat transfer efficiency needs to be improved.
A fin casing heat exchanger is designed, adopting an inner fin and an outer fin structure, with a space between the inner fin and the outer tube, and the outer fin and the outer tube are integrally formed. The fluid circulation area is divided by the inner fin, the flow rate is increased and the fluid state is changed to turbulent flow, the outer fin increases the air contact area, and aluminum alloy material is used to enhance the thermal conductivity effect.
It improves the heat transfer coefficient of the fluid, enhances the heat exchange effect, reduces the heat of the fluid, has a stable structure and is cost-saving, and is suitable for efficient heat exchange in complex processes.
Smart Images
Figure CN223077493U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of heat exchangers, and particularly relates to a finned tube-in-tube heat exchanger. Background Art
[0002] With the advancement of the industrial revolution, the scale of industrial production has been continuously expanding, and the requirement for energy utilization efficiency has become increasingly high. In many industrial processes, such as chemical industry, petroleum, electric power, metallurgy and other fields, heat transfer and exchange are often required to meet the specific temperature requirements of the process. The emergence of heat exchangers is precisely to meet the demand for efficient heat exchange in this industrial development. With the rapid development of modern industry, the production scale has been continuously expanding, and the process has become increasingly complex. The demand for heat exchange in many industrial production processes continues to increase, such as precise temperature control in chemical reactions, high-temperature heat exchange in the oil refining process, etc. However, the heat transfer capacity of traditional heat exchangers can no longer meet the growing industrial demand. Content of the Utility Model
[0003] In view of this, the purpose of the utility model is to provide a finned tube-in-tube heat exchanger, which can enhance the heat transfer efficiency of the fluid in the cylinder.
[0004] To achieve the above purpose, the utility model provides the following technical solutions:
[0005] A finned tube-in-tube heat exchanger disclosed by the utility model includes a plurality of groups of longitudinal heat exchange tube assemblies arranged at intervals along the vertical direction, and each group of longitudinal heat exchange tube assemblies is evenly spaced along the horizontal direction. The longitudinal heat exchange tube assembly includes an inner tube and an outer tube coaxially and hermetically installed outside the inner tube. A heat exchange cavity is formed between the inner tube and the outer tube. The inner tubes of each group of longitudinal heat exchange tube assemblies are connected end to end through a bent tube, and the heat exchange cavities of each group of longitudinal heat exchange tube assemblies are connected end to end through a short tube. A plurality of inner fins extending longitudinally are evenly distributed on the outer side of the inner tube, and a plurality of outer fins extending longitudinally are evenly distributed on the outer side of the outer tube.
[0006] Further, a gap is formed between the outer side of the inner fin and the inner wall of the outer tube.
[0007] Further, the outer tube includes an outer tube body and outer tube seats rotatably and hermetically installed at both ends of the outer tube body. The outer tube seats are fixedly connected to the inner tube, and the outer fins are installed on the outer side of the outer tube body.
[0008] Further, the inner fin is integrally formed with the inner tube, and the outer fin is integrally formed with the outer tube body.
[0009] Further, both the inner fins and the outer fins are made of aluminum alloy materials.
[0010] Furthermore, the heat exchanger also includes a boiler feed water manifold and a boiler drain water manifold. The heat exchange cavity on one side of the same group of longitudinal heat exchange tube assemblies is connected to the boiler feed water manifold, and the heat exchange cavity on the other side is connected to the boiler drain water manifold.
[0011] Furthermore, the heat exchanger also includes a raw gas inlet manifold and a raw gas outlet manifold, and the inner tube corresponding to the heat exchange cavity connected to the boiler water discharge manifold is connected to the raw gas inlet manifold; the inner tube corresponding to the heat exchange cavity connected to the boiler feed water manifold is connected to the raw gas outlet manifold.
[0012] The beneficial effects of the utility model are:
[0013] The utility model discloses a finned tube heat exchanger, in which heat is exchanged internally by a medium in a heat exchange cavity and externally by external air. Since inner fins are arranged in the heat exchange cavity, the fluid flowing therethrough can be divided into several large blocks, so that the cross-sectional area of the fluid flow in each region is reduced, the fluid flow rate is increased, and the fluid state is changed from laminar flow to turbulent flow, thereby increasing the heat transfer coefficient of the fluid inside the outer tube and further increasing the overall heat transfer coefficient.
[0014] In the device disclosed by the utility model, the fins are made of bimetallic aluminum alloy, which can increase the contact area between the external cylinder and the air, and remove the heat of the fluid in the cylinder through natural convection heat exchange, which can further reduce the heat of the fluid in the heat exchange tube.
[0015] In the device disclosed in the utility model, multiple groups of longitudinal heat exchange tube assemblies are arranged, each group of longitudinal heat exchange tube assemblies is formed by multiple longitudinal heat exchange tube assemblies arranged in parallel in a transverse manner, which can effectively take away the heat in the heat exchange process. Both ends of the multiple longitudinal heat exchange tube assemblies are connected to the pipeline by flange connection, which is convenient for disassembly.
[0016] Other advantages, objectives and features of the utility model will be described in the following description and will be apparent to those skilled in the art to some extent, or those skilled in the art can be taught from the practice of the utility model. The objectives and other advantages of the utility model can be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] In order to make the purpose, technical solution and beneficial effects of the utility model clearer, the utility model is described with the following drawings:
[0018] Figure 1 It is a structural schematic diagram of the heat exchanger of the utility model;
[0019] Figure 2 This is a schematic structural diagram of the longitudinal heat exchange tube assembly of the utility model;
[0020] Figure 3It is a cross-sectional view of a longitudinal heat exchange tube assembly;
[0021] Figure 4 is Figure 3 an enlarged view of part A in
[0022] Figure 5 a sectional view of the longitudinal heat exchange tube assembly.
[0023] The reference signs in the drawings are as follows: longitudinal heat exchange tube assembly 1, inner tube 2, outer tube 3, heat exchange cavity 4, elbow 5, short tube 6, inner fin 7, outer fin 8, outer tube body 9, outer tube seat 10, boiler feed water header 11, boiler drain water header 12, raw gas inlet header 13, raw gas outlet header 14. Detailed implementation manners
[0024] As Figures 1 to 5 shown, a finned tube-in-tube heat exchanger disclosed by the present utility model includes 4 groups of longitudinal heat exchange tube assemblies 1 arranged at intervals along the vertical direction. Each group of longitudinal heat exchange tube assemblies 1 includes 4 longitudinal heat exchange tube assemblies 1 arranged along the horizontal direction. Each longitudinal heat exchange tube assembly 1 generally extends along the longitudinal direction. Both ends of the longitudinal heat exchange tube assembly 1 are supported by support plates, forming a 4×4 structural layout.
[0025] Specifically, the longitudinal heat exchange tube assembly 1 disclosed by the present utility model includes an inner tube 2 and an outer tube 3 coaxially and sealingly installed outside the inner tube 2. Both the inner tube 2 and the outer tube 3 are circular straight tubes and extend along the longitudinal direction. A heat exchange cavity 4 is formed between the inner tube 2 and the outer tube 3. The inner tubes 2 of each group of longitudinal heat exchange tube assemblies 1 are connected end to end through elbows 5. Taking the uppermost longitudinal heat exchange tube assembly 1 as an example, the tail end of the inner tube 2 of the first longitudinal heat exchange tube assembly 1 is connected to the front end of the inner tube 2 of the next longitudinal heat exchange tube assembly 1. The raw gas inlet header 13 is connected to the front end of the inner tube 2 of the first longitudinal heat exchange tube assembly 1. The tail end of the inner tube 2 of the next longitudinal heat exchange tube assembly 1 is connected to the front end of the inner tube 2 of the next longitudinal heat exchange tube assembly 1, and so on; the tail end of the inner tube 2 of the last longitudinal heat exchange tube assembly 1 is communicated with the raw gas outlet header 14.
[0026] Those skilled in the art should understand that the connection manner of the inner tubes 2 between each group of longitudinal heat exchange tube assemblies 1 is the same.
[0027] Furthermore, the heat exchange chambers 4 of each group of longitudinal heat exchange tube assemblies 1 of the present invention are connected end to end through short tubes 6. The short tubes 6 are arranged adjacent to the corresponding elbow tubes 5. A plurality of inner fins 7 extending longitudinally are evenly distributed on the outer side of the inner tube 2, and a plurality of outer fins 8 extending longitudinally are evenly distributed on the outer side of the outer tube 3. Since the inner fins 7 are arranged in the heat exchange chamber 4, the flowing fluid can be divided into several large blocks, reducing the cross-sectional area of fluid flow in each region, increasing the fluid velocity, and changing the fluid state from laminar flow to turbulent flow, thereby increasing the heat transfer coefficient of the fluid inside the outer tube 3 and further increasing the overall heat transfer coefficient. By providing the outer fins 8, the contact area between the outer tube 3 and the air can be increased, and the heat of the fluid in the cylinder can be carried away through natural convection heat transfer, further reducing the heat of the fluid in the heat exchange tube.
[0028] In this embodiment, a gap is formed between the outer side of the inner fin 7 and the inner wall of the outer tube 3, enabling the fluid to flow circumferentially to a certain extent, which can increase the heat exchange effect.
[0029] In this embodiment, the outer tube 3 includes an outer tube body 9 and outer tube seats 10 rotatably and sealingly installed at both ends of the outer tube body 9. The outer tube seats 10 are fixedly connected to the inner tube 2, and the outer fins 8 are installed on the outer side of the outer tube body 9. By providing the rotatable outer tube body 9, under the action of the irregular flow of the fluid or the action of wind, the outer tube body 9 and the outer fins 8 connected thereto can be driven to rotate, thereby increasing the speed of the air flow on the outside and enhancing heat dissipation.
[0030] In this embodiment, the inner fins 7 and the inner tube 2 are integrally formed, and the outer fins 8 and the outer tube body 9 are integrally formed, which can facilitate forming, save costs, the overall structure operates stably, and the service life of the device is improved. Both the inner fins 7 and the outer fins 8 are made of aluminum alloy material to improve the heat conduction effect.
[0031] In this embodiment, the heat exchanger further includes a boiler feed water header 11 and a boiler drain water header 12. The heat exchange chamber 4 on one side of the same group of longitudinal heat exchange tube assemblies 1 is communicated with the boiler feed water header 11, and the heat exchange chamber 4 on the other side is communicated with the boiler drain water header 12.
[0032] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention rather than to limit them. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the claims of the present invention.
Claims
1. A finned tube heat exchanger, characterized in that: It includes multiple groups of longitudinal heat exchange tube assemblies arranged at intervals along the vertical direction, and each group of longitudinal heat exchange tube assemblies is evenly spaced along the horizontal direction. The longitudinal heat exchange tube assembly includes an inner tube and an outer tube hermetically installed coaxially outside the inner tube. A heat exchange cavity is formed between the inner tube and the outer tube. The inner tubes of each group of longitudinal heat exchange tube assemblies are connected end to end by a bent pipe, and the heat exchange cavities of each group of longitudinal heat exchange tube assemblies are connected end to end by a short pipe. A number of inner fins extending longitudinally are evenly distributed on the outer side of the inner tube, and a number of outer fins extending longitudinally are evenly distributed on the outer side of the outer tube.
2. The finned tube heat exchanger according to claim 1, wherein: An interval is formed between the outer side of the inner fin and the inner wall of the outer tube.
3. The finned tube heat exchanger according to claim 2, wherein: The outer tube includes an outer tube body and outer tube seats rotatably and hermetically installed at both ends of the outer tube body. The outer tube seats are fixedly connected to the inner tube, and the outer fins are installed on the outer side of the outer tube body.
4. The finned tube heat exchanger according to claim 3, wherein: The inner fins are integrally formed with the inner tube, and the outer fins are integrally formed with the outer tube body.
5. A finned tube heat exchanger according to claim 1, characterized in that: Both the inner fins and the outer fins are made of aluminum alloy material.
6. A finned tube heat exchanger according to any one of claims 1-5, characterized in that: The heat exchanger further includes a boiler feed water header and a boiler drain water header. The heat exchange cavity on one side of the same group of longitudinal heat exchange tube assemblies is communicated with the boiler feed water header, and the heat exchange cavity on the other side is communicated with the boiler drain water header.
7. The finned tube heat exchanger according to claim 6, wherein: The heat exchanger further includes a raw gas inlet header and a raw gas outlet header. The inner tube corresponding to the heat exchange cavity communicated with the boiler drain water header is communicated with the raw gas inlet header; the inner tube corresponding to the heat exchange cavity communicated with the boiler feed water header is communicated with the raw gas outlet header.