Aerobic roll bottom type electric furnace two-end temperature field gradient heating system
Patent Information
- Application Number
- CN202522207208.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-10-20
- Publication Date
- 2026-09-25
- Estimated Expiration
- 2035-10-20
AI Technical Summary
这种加热方式存在明显缺陷：热气流因密度差自然上浮，导致炉膛上部温度高、下部温度低，形成垂直方向的温度梯度；同时，沿炉体长度方向，也可能因烧嘴布置或结构问题出现温度不均，存在气流死区
通过侧吹-顶旋-底导的三维协同作用，强制炉内气氛产生剧烈循环和湍流，彻底打破了传统炉内因自然对流导致的温度分层现象，使炉内各点的温度高度一致，温差可控制在极小的范围内，主动的、剧烈的气流扰动极大地强化了对流传热，相比传统以辐射为主的静态或弱对流加热方式，热交换效率得到质的飞跃，工件可以被更快、更均匀地加热，从而显著缩短工艺时间，降低单位产品的能耗。
Smart Images
Figure CN224802110U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of industrial heat treatment furnace technology, and in particular to a temperature gradient heating system at both ends of an oxygen-free roller hearth electric furnace. Background Technology
[0002] Roller hearth furnaces are commonly used continuous heat treatment equipment in industries such as metallurgy, ceramics, and glass. Workpieces are transported via internal conveyor rollers and heated, homogenized, and cooled under a protective gas environment with little or no oxygen. Traditional roller hearth furnaces primarily rely on radiative heat transfer from heating elements, resulting in a relatively static atmosphere or slow natural convection within the furnace. This heating method has significant drawbacks: hot air rises naturally due to density differences, leading to a higher temperature at the top and lower bottom of the furnace, creating a vertical temperature gradient; simultaneously, along the length of the furnace, uneven temperature distribution and dead zones in the airflow can occur due to burner arrangement or structural issues.
[0003] This non-uniformity in the temperature field leads to uneven heating of the workpiece, affecting the quality of heat treatment, such as inconsistent product performance and deformation. To solve this problem, it is usually necessary to extend the homogenization time of the workpiece, which not only reduces production efficiency but also increases energy consumption per unit product.
[0004] Therefore, developing a system that can achieve highly uniform and efficient heating within the furnace temperature field is of great significance for improving product quality and reducing production costs. Utility Model Content
[0005] To overcome the existing problems, this application provides a temperature gradient heating system at both ends of an oxygen-free roller hearth electric furnace, which effectively breaks the stratification phenomenon inside the furnace and significantly reduces the temperature difference in the vertical direction, especially the roller hearth furnace heating structure that increases the temperature at the bottom.
[0006] The technical solution adopted by the embodiments of this application to solve its technical problem is: A temperature gradient heating system at both ends of an oxygen-free roller hearth electric furnace includes a furnace body and a furnace lining disposed inside the furnace body, wherein the furnace lining is integrally formed with the furnace body. The furnace lining has several heating mechanisms installed longitudinally and at intervals at its inner bottom. Each heating mechanism includes a high-speed temperature-regulating burner installed on the side wall of the furnace lining. The optimal tilt angle for the high-speed temperature-regulating burner is 30°. The high-speed temperature-regulating burner is installed at a downward tilt angle so that the high-speed, high-temperature gas flow it ejects is directed towards the lower part of the furnace lining. The top of the furnace lining has several swirling nozzles. These nozzles inject protective gas into the furnace lining in a tangential rotating manner, forming a large-scale swirling field that disrupts the natural upward movement of the hot gas flow. The lower part of the furnace lining has a flow channel for guiding the gas flow from the lateral high-speed temperature-regulating burners to the furnace bottom, distributing it along the length of the furnace to avoid dead zones. The furnace lining has inclined plates at both ends of the flow channel.
[0007] Preferably, the side wall of the furnace body is also provided with a heating box, which is connected to the high-speed temperature-regulating burner through a pipe.
[0008] Preferably, a pumping box is provided at the top of the furnace body, and the pumping box passes through the furnace body and is connected to the swirl nozzle.
[0009] Preferably, a number of conveying rollers are installed longitudinally and at intervals at the bottom of the furnace body, and the length of the conveying rollers is the same as the length of the furnace body.
[0010] The advantages of the embodiments of this application are: Through the three-dimensional synergistic effect of side blowing, top swirling, and bottom guiding, the atmosphere inside the furnace is forced to generate violent circulation and turbulence, completely breaking the temperature stratification phenomenon caused by natural convection in traditional furnaces. This makes the temperature at all points inside the furnace highly uniform, and the temperature difference can be controlled within a very small range. The active and violent airflow disturbance greatly enhances convective heat transfer. Compared with the traditional static or weak convection heating method that is mainly based on radiation, the heat exchange efficiency has achieved a qualitative leap. The workpiece can be heated faster and more uniformly, thereby significantly shortening the process time and reducing the energy consumption per unit product. Attached Figure Description
[0011] The present invention will be further described below with reference to the accompanying drawings and embodiments.
[0012] Figure 1 This is a schematic diagram of the overall structure of the temperature field gradient heating system at both ends of the oxygen-free roller hearth electric furnace of this utility model; Figure 2 This is a schematic cross-sectional view of the internal structure of the temperature gradient heating system at both ends of the oxygen-free roller hearth electric furnace of this utility model; Figure 3 This is a half-section structural diagram of the temperature field gradient heating system at both ends of the oxygen-free roller hearth electric furnace of this utility model; Figure 4 This utility model provides a temperature gradient heating system for both ends of an oxygen-free roller hearth electric furnace. Figure 1A magnified view of the structure at point A in the middle; Figure 5 This is a schematic diagram of the furnace body in the temperature gradient heating system at both ends of the oxygen-free roller hearth electric furnace of this utility model.
[0013] Explanation of key figure labels: 1. Furnace body; 2. Furnace lining; 3. Conveyor roller; 4. Heating box; 5. Flow channel; 6. High-speed temperature-regulating burner; 7. Swirl nozzle; 8. Pump box; 9. Inclined plate. Detailed Implementation
[0014] This application provides a temperature gradient heating system at both ends of an oxygen-free roller hearth electric furnace, solving the problems in the prior art. Through the three-dimensional synergistic effect of side blowing, top swirl, and bottom guiding, the atmosphere inside the furnace is forced to generate violent circulation and turbulence, completely breaking the temperature stratification phenomenon caused by natural convection in traditional furnaces. This makes the temperature of each point in the furnace highly uniform, and the temperature difference can be controlled within a very small range. The active and violent airflow disturbance greatly enhances convective heat transfer. Compared with the traditional static or weak convection heating method that is mainly based on radiation, the heat exchange efficiency is significantly improved. The workpiece can be heated faster and more uniformly, thereby significantly shortening the process time and reducing the energy consumption per unit product.
[0015] The technical solution in this application is to solve the above problems, and the overall approach is as follows: Example This embodiment provides a specific structure for a temperature gradient heating system at both ends of an oxygen-free roller hearth electric furnace, such as... Figure 1-5 As shown, it includes a furnace body 1 and a furnace lining 2 disposed inside the furnace body 1, the furnace lining 2 being integrally formed with the furnace body 1; The furnace lining 2 has several heating mechanisms installed longitudinally and at intervals along its inner bottom. These mechanisms include high-speed temperature-regulating burners 6 mounted on the sidewalls of the furnace lining 2. The optimal inclination angle for the high-speed temperature-regulating burners 6 is 30°. The burners are installed at a downward angle so that the high-speed, high-temperature gas stream they emit is directed towards the lower part of the furnace lining 2. The top of the furnace lining 2 has several swirling nozzles 7. These nozzles inject protective gas into the furnace lining 2 in a tangential, rotating manner, creating a large-scale swirling field that disrupts the natural upward flow of the hot gas stream. The swirling nozzles 7 are evenly distributed in an array on the furnace top to ensure comprehensive and uniform coverage of the swirling field. The bottom of the furnace lining 2 has a flow channel 5 for guiding the lateral high-speed temperature-regulating burners 6. The airflow to the furnace bottom is guided and redistributed along the length of the furnace to avoid dead zones. The flow channel 5 can be a groove-shaped structure built directly on the furnace bottom, or it can be a channel spliced together from multiple guide plates. The bottom of the furnace lining 2 is provided with inclined plates 9 at both ends of the flow channel 5. Special refractory material is laid at the bottom of the furnace lining 2 to form a groove-shaped flow channel 5. After the airflow ejected from the high-speed temperature-regulating burner 6 on the side wall impacts the furnace bottom, it will diffuse along these flow channels 5 to the front and back of the furnace (i.e., along the length of the furnace), avoiding the airflow from stagnating in the area directly opposite the burner and forming a dead zone. To further optimize the flow guidance effect, inclined plates 9 can be set on both sides of the flow channel 5 to guide the airflow more accurately to the area that needs to be heated.
[0016] Furthermore, the inclined plate 9 at the bottom of the furnace lining 2, in conjunction with the flow channel 5, better guides the airflow to the central area of the furnace body.
[0017] The side wall of the furnace body 1 is also equipped with a heating box 4, which is connected to the high-speed temperature-regulating burner 6 through a pipe.
[0018] Furthermore, multiple high-speed temperature-regulating burners 6 are installed at intervals on both sides of the furnace lining 2. These burners are installed at an angle of about 30° downwards, and the high-speed flames or high-temperature gas they spray are directly directed towards the bottom area of the furnace to strongly heat the bottom of the workpiece placed on the conveyor roller 3.
[0019] A pumping box 8 is provided at the top of the furnace body 1. The pumping box 8 passes through the furnace body 1 and is connected to the swirl nozzle 7 to provide a stable and controllable protective gas source for the swirl nozzle 7.
[0020] Furthermore, multiple swirling nozzles 7 are installed on the top of the furnace lining 2. These swirling nozzles 7 are connected to the pumping box 8 outside the furnace through pipes. After the pumping box 8 pressurizes the protective gas, it is injected into the furnace in a tangential rotating manner through the swirling nozzles 7. This rotating airflow will form a swirling field covering the entire cross-section of the furnace, drawing down the rising hot air and mixing it with the air in the middle and lower parts.
[0021] Several conveyor rollers 3 are installed longitudinally and at intervals at the bottom of the furnace body 1. The length of the conveyor rollers 3 is the same as the length of the furnace body 1. In this way, the items are placed on the upper surface of the conveyor rollers 3 and moved by the conveyor rollers 3.
[0022] During operation, the furnace lining 2 serves as the heating chamber. Workpieces are conveyed through by the conveyor rollers 3. Multiple high-speed temperature-controlled burners 6 on both side walls of the furnace lining 2 emit high-speed flames or high-temperature gas directly towards the furnace bottom area, intensely heating the bottom of the workpieces placed on the conveyor rollers 3. Furthermore, the swirling nozzles 7 at the top of the furnace lining 2 are connected to a pumping box 8 outside the furnace via pipes. The pumping box 8 pressurizes the protective gas and injects it into the furnace chamber through the swirling nozzles 7 in a tangentially rotating manner. This rotating airflow forms a swirling field covering the entire cross-section of the furnace chamber, drawing down the rising hot air and mixing it with the lower and middle air, laying it at the bottom of the furnace lining 2. Special refractory materials are used to form grooved flow channels 5. After the airflow ejected from the high-speed temperature-regulating burner 6 on the side wall impacts the bottom of the furnace, it will diffuse along these flow channels 5 to the front and back of the furnace (i.e., along the length of the furnace), avoiding the airflow from stagnating in the area directly opposite the burner and forming a dead zone. To further optimize the flow guiding effect, inclined plates 9 can be set on both sides of the flow channels 5 to guide the airflow more precisely to the area that needs to be heated. With the three units operating simultaneously, the high-temperature airflow blown from the side, the protective gas swirling at the top, and the flow guiding effect of the bottom are coupled together to form a complex and efficient three-dimensional forced circulation flow field in the furnace, thereby achieving a rapid and uniform heating effect.
[0023] Finally, it should be noted that the above embodiments are merely examples for clearly illustrating the present invention and are not intended to limit the implementation. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.
Claims
1. A temperature gradient heating system at both ends of an oxygen-free roller hearth electric furnace, characterized in that, It includes a furnace body (1) and a furnace lining (2) disposed inside the furnace body (1), wherein the furnace lining (2) is integrally formed with the furnace body (1); The furnace lining (2) has several heating mechanisms installed longitudinally and at intervals at its inner bottom. The heating mechanism includes a high-speed temperature-regulating burner (6) installed on the side wall of the furnace lining (2). The high-speed temperature-regulating burner (6) is installed at an angle downward so that the high-speed high-temperature airflow it sprays is directed towards the lower part of the furnace lining (2). The top of the furnace lining (2) is provided with several swirling nozzles (7). The bottom of the furnace lining (2) is provided with a flow channel (5) for guiding the lateral high-speed temperature-regulating burner (6) to the airflow at the bottom of the furnace.
2. The temperature gradient heating system at both ends of an oxygen-free roller hearth electric furnace as described in claim 1, characterized in that, The optimal tilt angle for the high-speed temperature-regulating burner (6) is 30°.
3. The temperature gradient heating system at both ends of an oxygen-free roller hearth electric furnace as described in claim 1, characterized in that, The side wall of the furnace body (1) is also provided with a heating box (4), which is connected to the high-speed temperature-regulating burner (6) through a pipe.
4. The temperature gradient heating system at both ends of an oxygen-free roller hearth electric furnace as described in claim 1, characterized in that, The top of the furnace body (1) is provided with a pump box (8), which is connected to the swirl nozzle (7) through the furnace body (1).
5. The temperature gradient heating system at both ends of an oxygen-free roller hearth electric furnace as described in claim 1, characterized in that, Several conveyor rollers (3) are installed longitudinally and at intervals at the bottom of the furnace body (1).
6. The temperature gradient heating system at both ends of an oxygen-free roller hearth electric furnace as described in claim 1, characterized in that, The bottom of the furnace lining (2) is provided with inclined plates (9) at both ends of the flow channel (5).