U-shaped pipe heat treatment device

Abstract

The utility model relates to a U-shaped pipe heat treatment device, and relates to the technical field of heat treatment, the U-shaped pipe heat treatment device comprises a base and a device cover, the base is covered with the device cover, the base is provided with a fixing frame, the fixing frame is used for placing a U-shaped pipe, and heating pieces are arranged on the inner wall of the base and the inner wall of the device cover. A gap is reserved between the U-shaped pipe and the heating piece. By reasonably designing the layout of the heating pieces, direct contact between the heating pieces and the pipe wall is avoided, the U-shaped pipe can be evenly heated in the heat treatment process, the uniformity of temperature distribution of the U-shaped pipe in the whole treatment process is ensured through the distribution design of the heating pieces, the situation that the local temperature is too high or too low is avoided, the performance of the U-shaped pipe is recovered more completely, and the service life of the U-shaped pipe is prolonged. The problems of metal fatigue, cold hardening and the like caused in the cold bending process are avoided, so that the heat treatment quality is improved; meanwhile, due to the design of the device cover, the operation safety and efficiency are improved, the heat loss is reduced, and the high efficiency and stability of the heat treatment process are ensured.

Description

Technical Field

[0001] This application relates to the field of heat treatment technology, and in particular to a U-shaped tube heat treatment apparatus. Background Technology

[0002] U-tube heat exchangers, due to their ability to expand and float freely, effectively address stress issues caused by temperature differences. Therefore, they exhibit excellent performance under high temperature, high pressure, and high temperature difference conditions, making them widely used heat exchange equipment in the petrochemical industry. Their core component—the tube bundle—is assembled from multiple straight tubes cold-bent into a U-shape. Although U-tube heat exchangers offer significant technical advantages, the cold bending process can cause work hardening and changes in the metallographic structure of the tubes, potentially damaging material properties and affecting the overall efficiency of the heat exchanger. Therefore, the cold-bent U-tubes, especially the bent sections and at least 150mm of straight tubes at both ends, require heat treatment to restore the original material properties.

[0003] The common heat treatment method currently involves stacking U-shaped tubes in groups, wrapping them with a heated conveyor belt, and covering them with aluminum silicate cotton for localized insulation, thus heat-treating the tubes. While this heat treatment method has achieved some success in practical applications, it still has several drawbacks and problems, mainly including:

[0004] 1. Overheating problem: The part of the heated track that is in direct contact with the heat exchange tube wall may overheat due to uneven heating or inaccurate temperature control. In severe cases, it may cause excessive oxidation of the material or even melt through, affecting the service life and safety of the heat exchange tube.

[0005] 2. Temperature non-uniformity: In the pipe wall area that is not in contact with the heating track, the temperature distribution is prone to be uneven due to the way the heating track is wrapped, forming a harmful temperature gradient, which affects the quality of heat treatment and leads to incomplete recovery of material properties.

[0006] 3. Inaccurate temperature monitoring: Current temperature measurement methods mainly involve placing thermocouples inside the heating conveyor belt. However, due to incomplete contact between the heating conveyor belt and the pipe wall or deviations in the placement of the thermocouples, the monitored temperature data is inaccurate, leading to deviations in the heat treatment temperature and consequently affecting the heat treatment effect.

[0007] Therefore, there is an urgent need to develop a heat treatment technology that can ensure the quality of U-tubes after heat treatment while guaranteeing the restoration of U-tube material properties. Utility Model Content

[0008] In order to develop a heat treatment technology that can ensure the quality of U-tubes after heat treatment while guaranteeing the restoration of U-tube material properties, this application provides a U-tube heat treatment device.

[0009] The U-shaped tube heat treatment apparatus provided in this application adopts the following technical solution:

[0010] A heat treatment device for a U-shaped tube includes a base and a device cover. The device cover is placed on the base. The base is provided with a fixing frame for placing the U-shaped tube. Heating elements are provided on the inner walls of the base and the device cover. A gap is left between the U-shaped tube and the heating elements.

[0011] By adopting the above technical solution, this application achieves uniform heating of the U-shaped tube during heat treatment by rationally designing the layout of the heating elements and avoiding direct contact between the heating elements and the tube wall. The distribution design of the heating elements ensures the uniformity of temperature distribution throughout the entire process, avoiding excessively high or low local temperatures, thus allowing for a more complete recovery of the U-shaped tube's performance and preventing problems such as metal fatigue and work hardening caused by cold bending, thereby improving the quality of heat treatment. At the same time, the design of the device cover increases the safety and efficiency of operation, reduces heat loss, and ensures the high efficiency and stability of the heat treatment process, thereby improving the quality and performance of the U-shaped tube.

[0012] In one specific implementation, the device is equipped with an inlet and outlet.

[0013] By adopting the above technical solution, the design of the inlet and outlet ports makes the loading and unloading process of U-shaped tubes faster and more efficient, reducing manual operation time.

[0014] In one specific implementation, the heating element includes an insulation layer and a heating track. The insulation layer is disposed along the inner wall of the base and the peripheral inner wall of the device cover, and the heating track is disposed on the insulation layer.

[0015] By adopting the above technical solution and rationally configuring the heated track and the insulation layer, the design of the insulation layer can reduce the influence of the external environment on the internal heat, reduce heat loss, and ensure that the temperature of the heating zone remains constant. This allows the heated track to provide a stable temperature throughout the heat treatment process, ensuring the efficiency and consistency of the process and avoiding uneven heat treatment caused by local overheating or overcooling.

[0016] In one specific implementation, the heated track is disposed along the area where the insulation layer is set, and is disposed away from the inner wall on the side near the inlet and outlet.

[0017] By adopting the above technical solution, the heated track is arranged in the area of ​​the insulation layer. The insulation layer can help keep the heat from being lost and ensure the uniformity of heating. Since the inlet and outlet often need to maintain a low temperature or facilitate the smooth entry and exit of materials, the heated track is set away from the inlet and outlet to avoid the impact of high temperature on the inlet and outlet parts and materials, and to avoid problems such as deformation, melting or uneven heating of materials caused by local overheating.

[0018] In one specific implementation, a gap is left between the U-shaped tube and the heated track.

[0019] By adopting the above technical solution and utilizing the gap, the heat exchange between the U-tube and the heated track is controlled, preventing the accumulation of high temperature caused by direct contact, thereby preventing problems such as excessive oxidation, melt-through, and uneven heat conduction. The gap not only protects the material and structure of the U-tube and improves thermal efficiency, but also enhances the long-term safety and reliability of the device.

[0020] In one specific implementation, a temperature sensor is also included, which is disposed on the U-tube and used to monitor and record the heat treatment temperature of the U-tube.

[0021] By adopting the above technical solution and installing temperature sensors on the U-tube, it is possible not only to monitor and record the temperature in real time to ensure that the heat treatment process meets the requirements, but also to improve the automation and intelligence level of the system, optimize energy efficiency, and enhance safety and the service life of the device.

[0022] In one specific implementation, a control device is also included, which is disposed on the device cover. The control device is used to receive the temperature signal from the temperature sensor and to adjust the power of the heated track according to the temperature signal.

[0023] By adopting the above technical solution, the temperature sensor monitors and acquires the temperature data of the U-tube in real time, and then transmits this data to the control device. The control device receives the signal transmitted by the temperature sensor and converts it into a control command that can be used to adjust the heating power of the track, thereby ensuring the stability and reliability of the heat treatment process, avoiding overheating that could cause oxidation or melt-through of the material, improving the heat treatment quality, and extending the service life of the U-tube.

[0024] In one specific implementation, an insulation material layer is provided at the inlet and outlet, and the insulation material layer seals the inlet and outlet.

[0025] By adopting the above technical solution, and by setting up a thermal insulation layer at the inlet and outlet and sealing the inlet and outlet, the thermal efficiency of the device can be effectively improved, energy waste can be reduced, the temperature stability of the device can be maintained, the life of the device can be extended, and the safety and reliability of the production process can also be improved.

[0026] In one specific implementation, the insulation material layer is connected and sealed to the inlet / outlet by a sealing layer.

[0027] By adopting the above technical solution and utilizing the design of the sealing layer, the joint between the insulation material and the inlet / outlet can be effectively sealed to prevent heat from leaking out from the joint, thereby maintaining the thermal efficiency of the device.

[0028] In one specific implementation, the insulation layer and the insulation material layer are aluminum silicate cotton layers.

[0029] By adopting the above technical solution, aluminum silicate cotton can withstand working temperatures of up to 1000℃-1500℃, has excellent thermal resistance performance, can significantly reduce heat conduction, thereby improving thermal efficiency and maintaining heat stability, enabling the heated track to provide a stable temperature throughout the heat treatment process; and can effectively prevent heat from corroding or aging the equipment materials, extending the service life of the equipment.

[0030] In summary, this application includes at least one of the following beneficial technical effects: By rationally designing the structure of the base and device cover, the arrangement of heating elements, the setting of the insulation layer, and the sealing of the inlet and outlet, this application ensures that the U-shaped tube can be heated uniformly during the heat treatment process, reducing heat loss and improving heat treatment efficiency; the U-shaped tube section maintains an appropriate gap between itself and the heating conveyor belt inside the device, avoiding direct contact and thus effectively avoiding the risk of excessive oxidation and melt-through; by rationally arranging the heating conveyor belt and insulation layer, it ensures that the U-shaped tube can be heated uniformly during the heat treatment process, avoiding uneven heat treatment caused by temperature gradients; the inner wall of the device is equipped with thermocouples and thermocouple monitoring devices, which can monitor and control the temperature in the heat treatment space in real time, thereby avoiding overheating, ensuring the stability and reliability of the heat treatment process, providing an efficient, uniform, and safe heat treatment environment, improving heat treatment quality, and extending the service life of the U-shaped tube. Attached Figure Description

[0031] Figure 1 This is a structural diagram used to display the base and the device cover.

[0032] Figure 2 It is a cross-sectional view used to show the structure of the device cover and the heating element.

[0033] Explanation of reference numerals in the attached drawings: 1. Base; 11. Base plate; 12. Support leg; 2. Device cover; 21. Front wall panel; 22. Rear wall panel; 23. Top plate; 24. Side wall panel; 3. Fixing frame; 4. Inlet / outlet; 5. Heating element; 51. Insulation layer; 52. Heated track. Detailed Implementation

[0034] The following is in conjunction with the appendix Figure 1-2 This application will be described in further detail.

[0035] Reference Figure 1 and Figure 2 This application discloses a U-shaped tube heat treatment device, including a base 1 and a device cover 2. The device cover 2 covers the base 1 to form a sealed heat treatment space. In this embodiment, the base 1 and the device cover 2 are made of steel plates welded together, but are not limited to being made of steel plates welded together. In this embodiment, the device cover 2 is formed by welding together a front wall plate 21, a rear wall plate 22, a top plate 23 and two side wall plates 24. The base 1 is formed by welding together a bottom plate 11 and four support legs 12.

[0036] The base 1 is provided with a fixing frame 3, which is used to place the U-shaped tubes. The U-shaped tubes are stacked together in groups and fixed on the fixing frame 3 to ensure that the U-shaped tube segments are stable and do not shift during the heat treatment process. The inner walls of the base 1 and the device cover 2 are provided with heating elements 5. There is a gap between the U-shaped tubes and the heating elements 5. In this embodiment, the distance between the U-shaped tubes and the bottom plate 11 of the base 1 and the top plate 23 of the device cover 2 is at least 30cm.

[0037] During installation, heating elements 5 are installed on the inner walls of the base 1 and the cover 2 of the device. The U-shaped tube is placed on the fixing frame 3, which supports and positions the U-shaped tube to ensure that the tube section maintains a stable position during the heat treatment process. The cover 2 is placed on the base 1 to enclose the heat treatment space. During operation, the heating elements 5 are heated to the set temperature by electrical energy or other energy sources, and the U-shaped tube is heated evenly during the heating process. During this process, a gap is left between the U-shaped tube and the heating elements 5, which can avoid direct contact between the heating elements 5 and the tube wall, reducing overheating and the risk of material oxidation.

[0038] The device cover 2 is provided with an inlet / outlet 4. In this embodiment, the inlet / outlet 4 is opened on the front wall plate 21. By designing the inlet / outlet 4, the loading and unloading of the U-shaped tube can be facilitated, thereby simplifying the operation process, reducing manual operation time, and improving production efficiency.

[0039] The heating element 5 includes an insulation layer 51 and a heating track 52. The insulation layer 51 is provided along the inner wall of the base 1 and the inner wall of the device cover 2. In this embodiment, the insulation layer 51 is laid on the inner wall of the bottom plate 11 of the base 1, the inner wall of the front wall plate 21, the rear wall plate 22, the top plate 23 and the inner wall of the two side wall plates 24 of the device cover 2.

[0040] In this embodiment, the insulation layer 51 includes, but is not limited to, a 20cm thick layer of aluminum silicate cotton. The aluminum silicate cotton can withstand working temperatures up to 1000℃-1500℃ and has very good thermal resistance performance. It can significantly reduce heat conduction, thereby improving thermal efficiency and maintaining heat stability, so that the heated track 52 can provide a stable temperature throughout the heat treatment process.

[0041] The heated track 52 is disposed on the insulation layer 51. The heated track 52 is disposed along the area of ​​the insulation layer 51 and avoids the inner wall of the side near the inlet / outlet 4. In this embodiment, the heated track 52 is disposed on the inner wall of the bottom plate 11 of the base 1, the rear wall plate 22 and the top plate 23 of the device cover 2, and the inner walls of the two side wall plates 24. Only the insulation layer 51 is laid on the front wall plate 21. Since the inlet / outlet 4 often needs to maintain a low temperature or facilitate the smooth entry and exit of materials, the heated track 52 is disposed away from the inlet / outlet 4 to avoid the influence of high temperature on the inlet / outlet 4 and the materials, and to avoid problems such as deformation, melting or uneven heating of materials caused by local overheating. Furthermore, by avoiding the side of the inlet / outlet 4, the heated track 52 can be concentrated in the insulation layer 51, which helps to stabilize and uniform the temperature.

[0042] During operation, when the heating track 52 is powered on, it generates heat and radiates it to the surrounding environment, transferring it to the pipe or workpiece to be processed. The heating track 52 continuously heats and conducts heat, and with the heat insulation effect of the insulation layer 51, the energy loss during the heating process is minimized, ensuring the high efficiency of heat treatment. By reasonably configuring the heating track 52 and the insulation layer 51, the design of the insulation layer 51 can reduce the influence of the external environment on the internal heat, reduce heat loss, and ensure that the temperature of the heating zone remains constant. This allows the heating track 52 to provide a stable temperature throughout the heat treatment process, ensuring the efficiency and consistency of the processing and avoiding uneven heat treatment caused by local overheating or undercooling.

[0043] There are gaps between the outer wall of the U-shaped tube and each heating track 52; this ensures that the heating track 52 does not come into direct contact with the tube wall. The design of this gap can avoid overheating and oxidation of the U-shaped tube that may be caused by direct contact. In this way, the heat conduction method is effectively controlled, avoiding problems such as excessive oxidation and melt-through caused by high temperature accumulation. At the same time, the setting of the gap helps to improve heat exchange efficiency and enhance the safety and stability of heat treatment.

[0044] In this embodiment, after the U-tube is placed, the thermocouple is installed between the U-tube, and the device cover 2 and the base 1 are installed in sequence, in order to further improve the thermal efficiency of the device, this application provides a heat insulation material layer at the inlet and outlet 4. The heat insulation material layer seals the inlet and outlet 4 to reduce heat loss.

[0045] In this embodiment, the insulation layer 51 includes, but is not limited to, an aluminum silicate cotton layer; the aluminum silicate cotton can withstand working temperatures up to 1000℃-1500℃, has very good thermal resistance performance, can significantly reduce heat conduction, thereby improving thermal efficiency and maintaining heat stability, so that the heated track 52 can provide a stable temperature throughout the heat treatment process.

[0046] The insulation material is connected and sealed to the inlet / outlet 4 by a sealing layer. In this embodiment, the sealing layer includes, but is not limited to, a clay layer. The design of the sealing layer can effectively seal the joint between the insulation material and the inlet / outlet 4, preventing heat from leaking from the joint, thereby maintaining the thermal efficiency of the device.

[0047] By designing an insulation material layer at the inlet / outlet 4 and sealing the inlet / outlet 4, the thermal efficiency of the device can be effectively improved, energy waste reduced, the temperature stability of the device maintained, and the lifespan of the device extended. At the same time, the safety and reliability of the production process can also be improved.

[0048] The U-tube heat treatment device also includes a temperature sensor and a control device. In this embodiment, the temperature sensor is a thermocouple, which is installed on the U-tube and used to monitor and record the heat treatment temperature of the U-tube. The control device is a thermocouple monitoring device, which is used to receive the temperature signal from the thermocouple and to adjust the power of the heating conveyor belt 52 according to the temperature signal.

[0049] During the heat treatment of the heated track 52, the temperature sensor monitors and acquires the temperature data of the U-shaped tube in real time, and then transmits this data to the control device. The control device receives the signal transmitted by the temperature sensor and converts it into a control command that can be used to adjust the power of the heated track 52, thereby ensuring the stability and reliability of the heat treatment process, avoiding overheating that could cause oxidation or melt-through of the material, improving the heat treatment quality, and extending the service life of the U-shaped tube.

[0050] The implementation principle of this application embodiment is as follows: During installation, steel plates are welded together to form a device base 1 and a dedicated cover; an insulation layer 51 is laid on the inner wall of the bottom plate 11 of the base 1, and on the inner walls of the front wall 21, rear wall 22, top plate 23 and two side wall plates 24 of the device cover 2; then a heated track 52 is arranged on the insulation layer 51. The area where the heated track 52 is arranged is the inner wall of the bottom plate 11, the inner walls of the rear wall 22, top plate 23 and two side wall plates 24 of the device cover 2, wherein only the insulation layer 51 is laid on the front wall 21 of the device cover 2.

[0051] In use, stack the U-shaped tubes together in groups and fix them on the fixing frame 3. The distance between the stacked and fixed U-shaped tube groups and the bottom plate 11 of the base 1 and the top plate 23 of the device cover 2 should be at least 30cm. Then, arrange thermocouples on the U-shaped tube groups. Arrange thermocouple monitoring devices on the inner wall of the device cover 2. Cover the device cover 2 on the base 1 and install it with the base 1 to seal the heat treatment space. Then, set the inlet and outlet 4 of the device cover 2 to fill with heat insulation material. The heat insulation material layer seals the inlet and outlet 4. Use a sealing layer to seal and connect them to complete the preparation work.

[0052] During operation, the heated track 52 is heated to a set temperature by electricity or other energy sources. After being powered on, the heated track 52 generates heat and radiates it to the surrounding environment, transferring it to the U-shaped tube. By continuously heating and conducting heat, the heated track 52 ensures that the U-shaped tube is heated evenly during the heating process. Combined with the heat insulation effect of the insulation layer 51, energy loss during the heating process is minimized, ensuring the high efficiency of heat treatment. While the heated track 52 is performing heat treatment, the temperature sensor monitors and acquires the temperature data of the U-shaped tube in real time and transmits the data to the control device. The control device receives the signal transmitted by the temperature sensor and converts it into control commands that can be used to adjust the power of the heated track 52, thereby ensuring the stability and reliability of the heat treatment process, avoiding overheating that could cause oxidation or melt-through of the material, improving the quality of heat treatment, and extending the service life of the U-shaped tube.

[0053] The U-shaped tube heat treatment apparatus disclosed in this application ensures uniform heating of the U-shaped tube during heat treatment by rationally designing the structure of the base 1 and the device cover 2, the arrangement of the heating elements 5, the setting of the insulation layer 51, and the sealing of the inlet and outlet 4. This reduces heat loss and improves heat treatment efficiency. A suitable gap is maintained between the U-shaped tube section and the heating conveyor belt 52 within the apparatus, avoiding direct contact and effectively preventing the risk of excessive oxidation and melt-through. The rational layout of the heating conveyor belt 52 and the insulation layer 51 ensures uniform heating of the U-shaped tube during heat treatment, avoiding uneven heat treatment caused by temperature gradients. The inner wall of the apparatus is equipped with thermocouples and thermocouple monitoring devices, which can monitor and control the temperature within the heat treatment space in real time, thereby preventing overheating, ensuring the stability and reliability of the heat treatment process, providing an efficient, uniform, and safe heat treatment environment, improving heat treatment quality, and extending the service life of the U-shaped tube.

[0054] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A U-shaped tube heat treatment apparatus, characterized in that: Includes a base (1) and a device cover (2), the device cover (2) covers the base (1), the base (1) is provided with a fixing frame (3), the fixing frame (3) is used for placing the U-shaped tube, the inner walls of the base (1) and the device cover (2) are provided with heating elements (5), and there is a gap between the U-shaped tube and the heating elements (5).

2. The U-shaped tube heat treatment apparatus according to claim 1, characterized in that: The device cover (2) is provided with inlet and outlet ports (4).

3. The U-shaped tube heat treatment apparatus according to claim 2, characterized in that: The heating element (5) includes an insulation layer (51) and a heating track (52). The insulation layer (51) is disposed along the inner wall of the base (1) and the inner wall of the peripheral side of the device cover (2). The heating track (52) is disposed on the insulation layer (51).

4. The U-shaped tube heat treatment apparatus according to claim 3, characterized in that: The heated track (52) is arranged along the setting area of ​​the insulation layer (51) and avoids the inner wall of the side near the inlet / outlet (4).

5. The U-shaped tube heat treatment apparatus according to claim 4, characterized in that: The gap is left between the U-shaped tube and the heated track (52).

6. The U-shaped tube heat treatment apparatus according to claim 3, characterized in that: It also includes a temperature sensor, which is installed on the U-tube and is used to monitor and record the heat treatment temperature of the U-tube.

7. The U-shaped tube heat treatment apparatus according to claim 6, characterized in that: It also includes a control device, which is located on the device cover (2). The control device is used to receive the temperature signal from the temperature sensor and to adjust the power of the heated track (52) according to the temperature signal.

8. The U-shaped tube heat treatment apparatus according to claim 3, characterized in that: The inlet / outlet (4) is provided with a heat insulation material layer, which seals the inlet / outlet (4).

9. The U-shaped tube heat treatment apparatus according to claim 8, characterized in that: The insulation material layer is connected and sealed to the inlet / outlet (4) by a sealing layer.

10. The U-shaped tube heat treatment apparatus according to claim 8, characterized in that: The insulation layer (51) and the insulation material layer are aluminum silicate cotton layers.

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