Waste heat recovery structure of high-efficiency energy-saving heat treatment device
Patent Information
- Application Number
- CN202522626888.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-11
- Publication Date
- 2026-10-27
- Estimated Expiration
- 2035-12-11
AI Technical Summary
[0003]有鉴于此，本实用新型提供的一种热处理高效节能装置的余热回收结构，解决了现有热处理装置在工作过程中产生大量高温废气直接排放造成能源浪费，导致现有余热回收装置结构复杂换热效率低下的技术问题
[0011]采用上述改进方案的有益效果为：热交换板的波纹沿导流管轴向延伸形成了顺应气流方向的传热通道减少了气流扰动,每个波峰的曲率半径为5至8毫米的设置既保证了波峰与导流管外壁的有效接触面积又使得热交换板具有足够的结构强度,波纹结构在轴向延伸时形成的连续波峰能够持续从导流管吸收热量并通过波谷向换热腔体内壁传导,形成了稳定高效的热量传递路径。
Smart Images
Figure CN224905833U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the technical field of waste heat recovery structure, specifically, it relates to a waste heat recovery structure of a high-efficiency and energy-saving heat treatment device. Background Technology
[0002] In modern industrial production, heat treatment processes are widely used in the processing and manufacturing of metal parts, including various heat treatment methods such as quenching, tempering, annealing, and normalizing. These heat treatment processes require heating the workpiece to a high temperature and holding it at that temperature in a specific atmosphere for a certain time, followed by cooling according to process requirements. During the heat treatment process, the heating furnace or heat treatment furnace generates a large amount of high-temperature waste gas with a temperature range of 400 to 800 degrees Celsius. If this high-temperature waste gas is directly discharged into the atmosphere, it not only wastes a large amount of heat energy and increases the energy costs of enterprises, but also causes thermal pollution to the surrounding environment. In order to recover and utilize this waste heat, existing technologies usually use heat exchanger devices, installing plate heat exchangers or tube heat exchangers on the waste gas emission channel. These heat exchangers use metal plates or metal tubes as heat transfer media to connect the high-temperature waste gas with a cold fluid. While heat exchange can recover some waste heat, existing waste heat recovery devices generally suffer from complex structures, requiring multiple heat exchange units, piping systems, valve control systems, and other components, resulting in bulky equipment, large footprint, and difficult installation and commissioning. Furthermore, existing heat exchangers have limited heat exchange areas, short residence times for high-temperature waste gas within the exchanger, and insufficient contact, leading to low heat exchange efficiency and a significant amount of waste heat remaining unrecovered and emitted with the waste gas. In addition, inadequate insulation measures in existing devices cause severe heat dissipation from the heat exchanger shell, further reducing waste heat recovery efficiency. These problems render existing waste heat recovery devices ineffective in practical applications and unable to meet the urgent needs for energy conservation and emission reduction in industrial production. Therefore, it is necessary to develop a waste heat recovery device with a simple structure, high heat exchange efficiency, and good insulation performance to solve the aforementioned technical problems. Utility Model Content
[0003] In view of this, the waste heat recovery structure of the high-efficiency and energy-saving heat treatment device provided by this utility model solves the technical problem that the existing heat treatment device generates a large amount of high-temperature waste gas during operation, which directly causes energy waste and leads to the complex structure and low heat exchange efficiency of the existing waste heat recovery device.
[0004] This utility model is implemented as follows:
[0005] This utility model provides a waste heat recovery structure for a high-efficiency and energy-saving heat treatment device, including a heat exchange cavity, a guide pipe, a heat exchange plate, and a heat collection hood. The heat exchange cavity is a rectangular box structure with an air inlet at the top and an air outlet at the bottom. The guide pipe passes through the interior of the heat exchange cavity, with its first end connected to the air inlet and its second end extending to the bottom region of the heat exchange cavity and connected to the air outlet. The heat exchange plate is fixed to the inner wall of the heat exchange cavity and has a corrugated structure. The crests of the heat exchange plate contact the outer wall surface of the guide pipe, and the troughs of the heat exchange plate are in contact with the inner wall of the heat exchange cavity. The heat collection hood covers the outside of the heat exchange cavity, forming an insulation gap between the heat collection hood and the outer wall of the heat exchange cavity.
[0006] The technical effects of the waste heat recovery structure of the high-efficiency energy-saving heat treatment device provided by this utility model are as follows: High-temperature waste gas is guided to the bottom of the heat exchange chamber through the guide pipe and fully contacts the heat exchange plate to achieve heat transfer. The corrugated plate structure of the heat exchange plate increases the contact area with the high-temperature gas. The setting of the corrugations contacting the outer wall surface of the guide pipe allows heat to be conducted from the guide pipe to the heat exchange plate and then to the heat exchange chamber. The heat preservation gap formed between the heat collection cover and the outer wall of the heat exchange chamber reduces the heat loss to the outside. The overall structure is simple and compact with high heat exchange efficiency, effectively recovering the waste heat energy generated during the heat treatment process.
[0007] Based on the above technical solution, the waste heat recovery structure of the high-efficiency energy-saving heat treatment device of this utility model can be further improved as follows:
[0008] The cross-section of the guide tube is elliptical, and the major axis of the guide tube is parallel to the height direction of the heat exchange cavity.
[0009] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the elliptical cross-section structure of the guide tube increases the stability of gas flow and reduces flow resistance. The setting of the major axis parallel to the height direction of the heat exchange cavity makes the larger surface area of the elliptical cross-section face the heat exchange plate, which expands the heat transfer contact area between the guide tube and the heat exchange plate and improves the heat transfer rate from high-temperature exhaust gas to the heat exchange plate. At the same time, compared with the circular structure, the elliptical structure has a larger circumference under the same flow area, thereby improving the heat exchange performance.
[0010] Furthermore, the corrugations of the heat exchange plate extend axially along the guide tube, and the radius of curvature of each crest of the heat exchange plate is 5 to 8 mm.
[0011] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the corrugations of the heat exchange plate extend axially along the guide tube to form a heat transfer channel that conforms to the airflow direction, reducing airflow disturbance. The setting of the curvature radius of each crest of 5 to 8 mm not only ensures the effective contact area between the crest and the outer wall of the guide tube, but also gives the heat exchange plate sufficient structural strength. The continuous crests formed by the corrugated structure when extending axially can continuously absorb heat from the guide tube and conduct it to the inner wall of the heat exchange cavity through the troughs, forming a stable and efficient heat transfer path.
[0012] Furthermore, the minimum distance between the inner wall surface of the heat exchange cavity and the outer wall surface of the guide pipe is 20-35mm, and the bottom of the trough of the heat exchange plate is connected to the inner wall of the heat exchange cavity by spot welding.
[0013] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: maintaining a minimum distance of 20 to 35 mm between the inner wall of the heat exchange chamber and the outer wall of the guide tube provides sufficient installation space for the corrugated structure of the heat exchange plate and ensures a reasonable flow channel for the gas in the chamber. The bottom of the corrugation of the heat exchange plate is connected to the inner wall of the heat exchange chamber by spot welding, which not only fixes the position of the heat exchange plate but also forms a good heat conduction contact point. The spot welding method avoids the deformation problem of the heat exchange plate that may be caused by large-area welding, while maintaining the appropriate deformation capacity of the heat exchange plate when the temperature changes, preventing stress concentration from causing structural damage.
[0014] Furthermore, the second end port of the guide tube has a flared structure in the shape of a trumpet, and the expansion angle of the flared structure is 15 to 25°.
[0015] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: The second end of the guide pipe adopts a funnel-shaped flared structure, which allows the high-speed flowing high-temperature exhaust gas to gradually reduce its flow velocity and diffuse its flow direction when it approaches the outlet. The flared angle of 15 to 25 degrees avoids eddies and energy loss caused by sudden expansion of the airflow. The flared structure increases the residence time of the exhaust gas in the bottom area of the heat exchange chamber, prolonging the heat exchange process. At the same time, the diffused airflow can be more evenly distributed in the outlet area, reducing the occurrence of local overheating.
[0016] Furthermore, the thickness of the heat exchange plate is 2-4 mm, and the vertical height between the crests and troughs of the heat exchange plate is 15-25 mm.
[0017] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the thickness of the heat exchange plate is 2 to 4 mm, which not only ensures sufficient heat conduction capacity, but also makes the heat exchange plate have appropriate flexibility to adapt to thermal expansion and contraction. The vertical height of 15 to 25 mm between the crests and troughs forms a reasonable corrugation depth, which allows each corrugated unit to accommodate sufficient airflow and generate a turbulence effect to enhance convective heat transfer. This height setting also ensures that the crests can stably contact the outer wall of the guide tube, while the troughs can effectively fit the inner wall of the heat exchange cavity, forming a complete heat transfer chain.
[0018] Furthermore, the inner surface of the heat collection cover is evenly distributed along the outer wall contour of the heat exchange cavity, the width of the heat insulation gap is 10-20mm, and the heat collection cover is fixedly connected to the heat exchange cavity through a support frame.
[0019] The beneficial effects of the above-mentioned improvement scheme are as follows: a uniform heat insulation gap layer is formed at equal intervals along the outer wall contour of the heat exchange cavity on the inner surface of the heat collector cover. The air in the 10 to 20 mm wide heat insulation gap forms a static air layer, which plays a good role in heat insulation and prevents the heat absorbed by the heat exchange cavity from being lost to the outside. The structure of the heat collector cover being fixedly connected to the heat exchange cavity through the support frame ensures the stability of the heat insulation gap between the heat collector cover and the heat exchange cavity. The point connection method of the support frame reduces the thermal bridge effect and further reduces heat loss, thus improving the overall heat insulation performance of the waste heat recovery system.
[0020] Furthermore, the heat exchange plate is made of stainless steel, and the guide tube is made of heat-resistant alloy steel.
[0021] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the heat exchange plate is made of stainless steel, which has excellent corrosion resistance and thermal conductivity and can maintain stable heat exchange efficiency in high-temperature environments for a long time; the guide tube is made of heat-resistant alloy steel, which can withstand the high-temperature impact of heat treatment waste gas without deformation or oxidation. The reasonable selection of the two materials not only meets the usage requirements of their respective components but also ensures the service life of the entire waste heat recovery structure. The durability of the materials reduces the frequency of maintenance and replacement, thus reducing long-term operating costs.
[0022] Furthermore, the ratio of the length to the width of the heat exchange cavity is 3:1 to 5:1, and the ratio of the height to the width of the heat exchange cavity is 4:1 to 6:1.
[0023] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the setting of the length-to-width ratio of the heat exchange cavity is 3 to 5:1, which forms a narrow cavity structure, increases the flow path of gas in the cavity, and prolongs the heat exchange time. The setting of the height-to-width ratio is 4 to 6:1, which gives the heat exchange cavity a large vertical space, providing sufficient structural space for the arrangement of the guide pipe and the installation of the heat exchange plate. This ratio also makes the heat exchange cavity present a tall and narrow shape, which conforms to the natural law of the upward movement of hot air, and is conducive to forming a stable temperature gradient distribution and improving the waste heat recovery efficiency.
[0024] Furthermore, 3 to 5 heat exchange plates are evenly distributed along the circumference of the guide tube, the included angle between two adjacent heat exchange plates is 60 to 120 degrees, and the number of corrugations on each heat exchange plate is 8 to 12.
[0025] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: 3 to 5 heat exchange plates are evenly distributed around the circumference of the guide pipe, forming a multi-layer heat exchange structure around the guide pipe, which greatly increases the contact area with high-temperature exhaust gas. The 60 to 120-degree angle between adjacent heat exchange plates allows each heat exchange plate to be reasonably distributed in space, avoiding mutual obstruction and reserving a channel for gas flow. Each heat exchange plate has 8 to 12 corrugations, forming multiple heat exchange units on a single plate surface. This multi-plate, multi-corrugated combination structure greatly enhances the heat exchange capacity of the entire heat exchange cavity, realizing the deep recovery and utilization of waste heat from high-temperature exhaust gas.
[0026] Compared with existing technologies, the beneficial effects of the waste heat recovery structure of the high-efficiency energy-saving heat treatment device provided by this utility model are as follows: This utility model effectively controls the flow path of high-temperature waste gas by setting the guide pipe inside the heat exchange cavity and making the guide pipe run through the entire height of the heat exchange cavity. The heat exchange plate adopts a corrugated plate structure, and the crests of the corrugations contact the outer wall of the guide pipe, while the troughs are attached to the inner wall of the heat exchange cavity, forming a three-dimensional multi-level heat transfer channel. When the high-temperature waste gas flows in the guide pipe, the heat is conducted through the pipe wall to the crest of the heat exchange plate, then through the corrugated plate to the trough, and finally conducted to the outer wall of the heat exchange cavity for recovery and reuse. The insulation gap between the heat collection hood and the heat exchange cavity effectively reduces the loss of heat to the outside and improves the waste heat recovery rate. The components form a tight heat conduction chain, enabling the high-temperature waste heat generated during heat treatment to be fully recovered and converted into usable thermal energy. Compared with existing technologies, this utility model has a simple structure, requiring only four main components to achieve efficient waste heat recovery. It is easy to install and maintain, and has low manufacturing costs. The corrugated heat exchange plate design significantly increases the heat exchange area, achieving higher heat exchange efficiency in the same volume. The elliptical cross-section design and trumpet-shaped flared structure of the guide tube optimize airflow distribution, reducing flow resistance and energy loss. In practical applications, the entire device can significantly reduce the energy consumption of heat treatment equipment, achieving the goal of energy saving and consumption reduction. At the same time, it reduces the direct emission of high-temperature waste gas, which causes thermal pollution to the environment, and has good economic and environmental benefits. Attached Figure Description
[0027] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0028] Figure 1 This is an example diagram of a waste heat recovery structure for a high-efficiency and energy-saving heat treatment device;
[0029] Figure 2 A bottom view of the waste heat recovery structure of a high-efficiency energy-saving heat treatment device;
[0030] Figure 3 A top perspective view of the waste heat recovery structure of a high-efficiency energy-saving heat treatment device;
[0031] The attached diagram lists the components represented by each number as follows:
[0032] 10. Heat exchange chamber; 11. Air inlet; 12. Air outlet; 20. Guide pipe; 30. Heat exchange plate; 40. Heat collection cover. Detailed Implementation
[0033] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.
[0034] like Figures 1-3 The diagram shown is an example of the waste heat recovery structure of a high-efficiency energy-saving heat treatment device provided by this utility model. It includes a heat exchange chamber 10, a guide pipe 20, a heat exchange plate 30, and a heat collection shroud 40. The heat exchange chamber 10 has a rectangular box structure. An air inlet 11 is provided at the top of the heat exchange chamber 10, and an air outlet 12 is provided at the bottom of the heat exchange chamber 10. The guide pipe 20 passes through the interior of the heat exchange chamber 10, and its first end is connected to the air inlet 11. The second end of the guide pipe 20 extends to the bottom area of the heat exchange cavity 10 and communicates with the air outlet 12; the heat exchange plate 30 is fixed to the inner wall of the heat exchange cavity 10, and the heat exchange plate 30 has a corrugated plate structure. The crest of the heat exchange plate 30 contacts the outer wall surface of the guide pipe 20, and the trough of the heat exchange plate 30 fits against the inner wall of the heat exchange cavity 10; the heat collection cover 40 covers the outside of the heat exchange cavity 10, and a heat preservation gap is formed between the heat collection cover 40 and the outer wall of the heat exchange cavity 10.
[0035] The specific operation or usage method involves installing this waste heat recovery structure on the exhaust gas channel of the heat treatment furnace during normal operation of the heat treatment unit. First, connect the air inlet of the heat exchange chamber to the exhaust gas outlet of the heat treatment furnace via flange or welding, ensuring a good seal at the connection to prevent leakage of high-temperature exhaust gas. Connect the air outlet of the heat exchange chamber to the exhaust gas discharge pipe or the next stage treatment device. After installation, start the heat treatment unit. The high-temperature exhaust gas generated by the heat treatment furnace enters the heat exchange chamber from the air inlet under the pressure inside the furnace or under the suction of the induced draft fan. The exhaust gas first enters the guide pipe and flows downwards along it. During this flow, the heat of the exhaust gas is conducted through the pipe wall to the heat exchange plate. The heat exchange plate transfers the received heat to the heat exchange chamber. After heat exchange, the cooled exhaust gas exits from the funnel-shaped flare at the second end of the guide pipe and enters the bottom area of the heat exchange chamber. Finally, the heat is discharged from the outlet into the subsequent treatment system or released into the atmosphere. During the entire process, the temperature of the outer wall of the heat exchange chamber gradually increases. The heat absorbed by the heat exchange chamber can be recovered by arranging heat exchange medium pipelines such as water pipes or oil pipes on the outer wall of the heat exchange chamber. This recovered heat can be used for preheating the inlet air of the heat treatment furnace, preheating the workpiece, heating domestic water or heating in the factory. During use, the connection status of the guide pipe and the heat exchange plate should be checked regularly to ensure that the crest of the wave maintains good contact with the outer wall of the guide pipe. Check whether the insulation gap between the heat collection hood and the heat exchange chamber remains stable. After long-term use, if dust or oxides accumulate on the surface of the heat exchange plate, it should be cleaned to maintain good heat exchange performance. The entire device has a simple structure and is easy to operate. It can achieve automated operation without a complicated control system. When the heat treatment device is shut down, the waste heat recovery structure also stops working without additional operation.
[0036] In the above technical solution, the cross-section of the guide tube 20 is elliptical, and the long axis of the guide tube 20 is parallel to the height direction of the heat exchange cavity.
[0037] Furthermore, in the above technical solution, the corrugations of the heat exchange plate 30 extend axially along the guide tube 20, and the radius of curvature of each crest of the heat exchange plate 30 is 5 to 8 mm.
[0038] Furthermore, in the above technical solution, the minimum distance between the inner wall surface of the heat exchange cavity 10 and the outer wall surface of the guide pipe 20 is 20-35mm, and the bottom of the trough of the heat exchange plate 30 is connected to the inner wall of the heat exchange cavity 10 by spot welding.
[0039] Furthermore, in the above technical solution, the second end port of the guide tube 20 has a flared structure in the shape of a trumpet, and the expansion angle of the flared structure is 15 to 25°.
[0040] Furthermore, in the above technical solution, the thickness of the heat exchange plate 30 is 2-4 mm, and the vertical height between the crests and troughs of the heat exchange plate 30 is 15-25 mm.
[0041] Furthermore, in the above technical solution, the inner surface of the heat collection cover 40 is evenly distributed along the outer wall contour of the heat exchange cavity 10, the width of the heat insulation gap is 10-20mm, and the heat collection cover 40 is fixedly connected to the heat exchange cavity 10 through a support frame.
[0042] Furthermore, in the above technical solution, the heat exchange plate 30 is made of stainless steel, and the guide pipe 20 is made of heat-resistant alloy steel.
[0043] Furthermore, in the above technical solution, the ratio of the length to the width of the heat exchange cavity 10 is 3:1 to 5:1, and the ratio of the height to the width of the heat exchange cavity 10 is 4:1 to 6:1.
[0044] Furthermore, in the above technical solution, 3 to 5 heat exchange plates 30 are evenly distributed around the circumference of the guide tube 20, the included angle between two adjacent heat exchange plates 30 is 60 to 120 degrees, and the number of corrugations on each heat exchange plate 30 is 8 to 12.
[0045] In specific embodiment 1, the waste heat recovery structure is used to recover the waste heat from the high-temperature exhaust gas emitted by the metal heat treatment furnace. The heat exchange chamber is welded from Q235 carbon steel plate and has an overall rectangular structure. The external dimensions of the heat exchange chamber are 1200 mm in length, 300 mm in width, and 1500 mm in height. The air inlet at the top of the heat exchange chamber is a circular orifice with a diameter of 180 mm, and the air outlet at the bottom is also a circular orifice with a diameter of 200 mm. The guide pipe is made of 310S heat-resistant stainless steel. It possesses excellent high-temperature resistance and oxidation resistance. The cross-section of the guide tube is elliptical with a major axis of 160 mm, a minor axis of 100 mm, and a wall thickness of 3 mm. The total length of the guide tube is 1350 mm. The first end of the guide tube is welded to the air inlet to form a sealed structure. The second end of the guide tube extends to the bottom of the heat exchange chamber, 50 mm from the center of the air outlet. The second end is machined into a flared structure with a flared section length of 150 mm and an expansion angle of 20 degrees. The maximum diameter after flaring reaches 280 mm. The heat exchange plate adopts... Made of 304 stainless steel sheet with a thickness of 3 mm, the heat exchange plates are processed into a corrugated plate structure by stamping. Each heat exchange plate has 10 corrugations extending axially along the guide tube. The radius of curvature of each crest is 6 mm, the vertical height between the crest and trough is 20 mm, and the horizontal spacing between adjacent crests is 110 mm. In this embodiment, four heat exchange plates are evenly arranged along the circumference of the guide tube, with an included angle of 90 degrees between adjacent heat exchange plates. The length of each heat exchange plate is 1200 mm. The width is determined by the corrugated structure, and the actual length after the corrugations are unfolded is approximately 1400 mm. The crests of the heat exchange plate are connected to the outer wall of the guide tube by spot welding, with 3 to 5 weld points on each crest. The bottom of the troughs is also connected to the inner wall of the heat exchange chamber by spot welding to ensure the heat exchange plate is stably installed and forms good heat conduction contact. The minimum distance between the inner wall of the heat exchange chamber and the outer wall of the guide tube is 25 mm, providing ample installation space for the corrugated structure of the heat exchange plate. The heat collection cover is made of galvanized steel sheet with a thickness of 1 mm.The heat collection hood, with a 5mm diameter, is rectangular in shape, similar to the heat exchange cavity. The inner surface of the heat collection hood maintains a 15mm insulation gap evenly distributed along the outer wall of the heat exchange cavity. The heat collection hood is fixedly connected to the heat exchange cavity via several L-shaped support frames. These support frames are made of angle steel with a cross-sectional dimension of 25mm x 25mm. A group of four support frames is arranged every 400mm along the height of the heat exchange cavity, located on the four sides of the cavity. One end of each support frame is welded to the outer wall of the heat exchange cavity, and the other end is welded to the inner surface of the heat collection hood. This connection method ensures the stability of the insulation gap between the heat collection hood and the heat exchange cavity while minimizing the thermal bridging effect. The entire waste heat recovery structure is installed at the exhaust port of the metal heat treatment furnace. During operation, the heat treatment furnace generates... High-temperature exhaust gas, with a temperature of approximately 650 degrees Celsius, enters the guide pipe through the inlet. As the exhaust gas flows downwards within the guide pipe, heat is conducted through the pipe wall to the heat exchange plate. The corrugated structure of the heat exchange plate significantly increases the heat transfer area, resulting in efficient heat absorption from the exhaust gas. After heat exchange, the exhaust gas temperature drops to approximately 300 to 350 degrees Celsius and is discharged from the outlet. The heat absorbed by the heat exchange chamber raises its outer wall temperature to approximately 180 to 220 degrees Celsius. A water pipe circulation system arranged on the outer wall of the heat exchange chamber recovers the heat for preheating the process water in the heat treatment furnace. The insulation effect of the heat collection hood significantly reduces heat loss, improving waste heat recovery efficiency. The waste heat recovery structure in this embodiment operates stably, has good heat exchange performance, and effectively reduces the energy consumption of the heat treatment device.
[0046] Specific Embodiment 2 is based on Embodiment 1, with optimizations and improvements to the structure of the heat exchange plate. In this embodiment, the corrugations of the heat exchange plate are no longer regular corrugations of uniform height, but rather a variable-height corrugated structure. Specifically, the corrugation height is larger near the first end of the guide pipe, i.e., the upper region, with a vertical height of 25 mm between the peaks and troughs. As it extends downwards along the axial direction of the guide pipe, the corrugation height gradually decreases to a vertical height of 15 mm between the troughs. This variable-height design allows the heat exchange plate to have a larger heat exchange area in the upper region where the exhaust gas temperature is high, enabling it to absorb more heat, while in the lower region where the exhaust gas temperature is lower, the heat exchange area is appropriately reduced. Reducing the corrugation height lowers flow resistance. In this embodiment, the number of corrugations on each heat exchange plate is increased to 12, and the horizontal spacing between adjacent corrugations is adjusted to 95 mm. Increasing the number of corrugations further increases the heat exchange area. In addition, this embodiment adds a thermally conductive silicone grease filling layer with a thickness of about 0.5 mm at the contact point between the corrugations of the heat exchange plate and the guide pipe. The thermally conductive silicone grease can fill the tiny gaps between the metal contact surfaces, eliminate contact thermal resistance, and improve heat conduction efficiency. This improvement further enhances the heat exchange performance of the heat exchange plate, enabling the recovery of more waste heat under the same exhaust gas flow and temperature conditions. Other structures remain consistent with Embodiment 1.
[0047] Specifically, the principle of this utility model is as follows: Utilizing the basic principles of heat conduction and convection heat transfer, and through a rationally designed structural relationship between the heat exchange chamber, guide pipe, heat exchange plate, and heat collection hood, efficient recovery of waste heat from high-temperature exhaust gas is achieved. When the high-temperature exhaust gas enters the heat exchange chamber from the inlet, it first enters the guide pipe. The elliptical cross-section design of the guide pipe makes the exhaust gas flow more stable and reduces turbulence losses. As the exhaust gas flows downward within the guide pipe, its heat is conducted outward through the pipe wall. The crests of the heat exchange plate are in close contact with the outer surface of the guide pipe. A good heat conduction path is formed, and the heat from the tube wall is rapidly transferred to the crest of the heat exchange plate. The corrugated structure of the heat exchange plate significantly increases the heat transfer area; compared to a flat plate structure, the actual surface area of the corrugated plate can be increased by 2 to 3 times under the same projected area. As heat is transferred from the crest to the trough along the corrugated plate, the heat exchange plate and the air inside the heat exchange cavity undergo convective heat transfer, further accelerating the heat transfer. The close contact between the bottom of the trough and the inner wall of the heat exchange cavity allows the heat to be finally conducted to the outer wall of the heat exchange cavity. The heat exchange cavity absorbs... The collected heat can be radiated or conducted outward through the outer wall to other media in contact with it, thus realizing the recovery and utilization of waste heat. The air in the heat exchange cavity formed by the heat collection cover covering the outside of the heat exchange cavity is in a relatively static state. Static air is a good heat insulation material, which can effectively prevent the heat absorbed by the heat exchange cavity from being lost to the surrounding environment. This multi-layered heat transfer path and heat insulation structure ensures that the heat of the high-temperature waste gas is transferred to the heat exchange cavity to the maximum extent and is preserved instead of being lost to the environment. The trumpet-shaped flared structure at the second end of the guide pipe causes the high-speed flowing waste gas to gradually slow down and diffuse at the outlet, which prolongs the residence time of the waste gas at the bottom of the heat exchange cavity and increases the heat exchange time. The entire heat transfer process forms a complete chain from the guide pipe to the heat exchange plate and then to the heat exchange cavity. All links work closely together to achieve efficient waste heat recovery. The structural design of this utility model makes full use of the thermal conductivity characteristics of the material and the heat exchange enhancement effect of the geometry. It realizes a complex heat transfer process in a simple and compact structure, fundamentally solving the problem of low heat exchange efficiency in the existing technology.
Claims
1. A waste heat recovery structure for a high-efficiency and energy-saving heat treatment device, comprising a heat exchange chamber, a guide pipe, a heat exchange plate, and a heat collection shroud; the heat exchange chamber is a rectangular box structure, with an air inlet at the top and an air outlet at the bottom; characterized in that... The guide tube is inserted inside the heat exchange cavity. The first end of the guide tube is connected to the air inlet, and the second end of the guide tube extends to the bottom area of the heat exchange cavity and is connected to the air outlet. The heat exchange plate is fixed to the inner wall of the heat exchange cavity. The heat exchange plate has a corrugated plate structure. The crest of the heat exchange plate contacts the outer wall surface of the guide tube, and the trough of the heat exchange plate fits against the inner wall of the heat exchange cavity. The heat collection cover covers the outside of the heat exchange cavity, and a heat preservation gap is formed between the heat collection cover and the outer wall of the heat exchange cavity.
2. The waste heat recovery structure of a high-efficiency energy-saving heat treatment device according to claim 1, characterized in that, The cross-section of the guide tube is elliptical, and the major axis of the guide tube is parallel to the height direction of the heat exchange cavity.
3. The waste heat recovery structure of a high-efficiency energy-saving heat treatment device according to claim 2, characterized in that, The corrugations of the heat exchange plate extend axially along the guide tube, and the radius of curvature of each crest of the heat exchange plate is 5 to 8 mm.
4. The waste heat recovery structure of a high-efficiency energy-saving heat treatment device according to claim 3, characterized in that, The minimum distance between the inner wall of the heat exchange cavity and the outer wall of the guide pipe is 20-35 mm, and the bottom of the trough of the heat exchange plate is connected to the inner wall of the heat exchange cavity by spot welding.
5. The waste heat recovery structure of a high-efficiency energy-saving heat treatment device according to claim 4, characterized in that, The second end port of the guide tube has a flared structure in the shape of a trumpet, and the expansion angle of the flared structure is 15 to 25°.
6. The waste heat recovery structure of a high-efficiency energy-saving heat treatment device according to claim 5, characterized in that, The thickness of the heat exchange plate is 2-4 mm, and the vertical height between the crests and troughs of the heat exchange plate is 15-25 mm.
7. The waste heat recovery structure of a high-efficiency energy-saving heat treatment device according to claim 6, characterized in that, The inner surface of the heat collection cover is evenly distributed along the outer wall contour of the heat exchange cavity, the width of the heat insulation gap is 10-20mm, and the heat collection cover is fixedly connected to the heat exchange cavity through a support frame.
8. The waste heat recovery structure of a high-efficiency energy-saving heat treatment device according to claim 7, characterized in that, The heat exchange plate is made of stainless steel, and the flow guide tube is made of heat-resistant alloy steel.
9. The waste heat recovery structure of a high-efficiency energy-saving heat treatment device according to claim 8, characterized in that, The length-to-width ratio of the heat exchange cavity is 3:1 to 5:1, and the height-to-width ratio of the heat exchange cavity is 4:1 to 6:
1.
10. The waste heat recovery structure of a high-efficiency energy-saving heat treatment device according to claim 9, characterized in that, The heat exchange plates are evenly distributed in 3 to 5 pieces along the circumference of the guide tube. The included angle between two adjacent heat exchange plates is 60 to 120 degrees, and the number of corrugations on each heat exchange plate is 8 to 12.