An annealing furnace waste heat recovery device

Abstract

This utility model relates to the field of heat recovery devices, specifically an annealing furnace waste heat recovery device. It includes a tube body with an inlet pipe fixedly installed on its upper surface. A heat exchange chamber is formed inside the tube body, and an installation shaft is rotatably installed within the heat exchange chamber. A heat exchange tube is fixedly installed on the installation shaft. It also includes an outlet pipe, fixedly installed on the lower surface of the tube body, with a baffle fixedly installed inside the outlet pipe. In this utility model, by connecting the inlet pipe to the annealing furnace for further heat exchange with the heat exchange tube, when the high-temperature gas cools to a certain temperature, the rotating shaft is rotated to adjust the position of the adjusting plate, aligning the through-slot with the exhaust chamber to discharge the gas. The high-temperature gas returns to the heat exchange chamber through the recovery pipe for secondary heat exchange, achieving cascade utilization of thermal energy and improving the waste heat recovery rate. By rotating the adjusting plate to change the position of the through-slot, the airflow can be flexibly distributed to the recovery chamber and the exhaust chamber to adapt to different operating conditions. Multiple heat exchanges reduce the exhaust gas temperature, minimizing thermal shock to subsequent pipelines and equipment.

Description

Technical Field

[0001] This utility model relates to the field of recycling devices, and in particular to a waste heat recovery device for an annealing furnace. Background Technology

[0002] An annealing furnace is a piece of equipment used in heat treatment processes, primarily for processing materials such as metals, alloys, and glass. During manufacturing, internal stresses are generated within the material, which can lead to deformation or even cracking. The annealing process, through heating and subsequent slow cooling, allows the atoms within the material to rearrange, thereby reducing or eliminating internal stresses. Annealing can alter the microstructure of materials, making them softer and easier to process. For materials that have undergone cold working, their crystal structure may become disordered, leading to a decline in material properties. Annealing helps restore the normal crystal structure of materials, thereby restoring their original physical and mechanical properties. Waste heat recovery effectively utilizes heat that would otherwise be wasted, reducing energy consumption. By using this heat to preheat combustion air, heat media in other processes, or directly generate electricity, overall energy costs can be significantly reduced. Using waste heat recovery systems helps reduce emissions of greenhouse gases and other pollutants. The recovered heat energy is used to preheat workpieces or maintain furnace temperature fluctuations, reducing energy demand in the heating section and making temperature control more stable. Direct emissions of high-temperature exhaust gases carry pollutants; waste heat recovery can reduce exhaust gas temperature, reduce harmful gas emissions, and suppress the heat island effect. High-temperature exhaust gases can easily corrode flues. Waste heat recovery systems can reduce exhaust gas temperature and minimize thermal stress damage to equipment. The recovered heat can be directly applied to production processes, such as preheating raw materials or products, thereby accelerating processing speed and improving the overall efficiency of the production line. Waste heat recovery directly reduces the use of fossil fuels, converting waste heat into secondary energy sources such as electricity and compressed air, achieving multi-energy complementarity.

[0003] The Chinese patent CN212404205U discloses an annealing furnace waste heat recovery device, which heats the water in the storage tank after heat exchange through heat exchange coils to meet the temperature requirements of domestic water for enterprises. However, there is a problem of poor heat exchange effect when performing waste heat recovery. In view of this, an annealing furnace waste heat recovery device is provided. Utility Model Content

[0004] The main purpose of this utility model is to provide a waste heat recovery device for annealing furnaces to solve the problem of poor heat exchange effect in the related technology when performing waste heat recovery.

[0005] To achieve the above objectives, according to one aspect of this utility model, an annealing furnace waste heat recovery device is provided, comprising a tube body, an inlet pipe fixedly installed on the upper surface of the tube body, a heat exchange chamber opened inside the tube body, an installation shaft rotatably installed inside the heat exchange chamber, and a heat exchange tube fixedly installed on the installation shaft, and further comprising: an outlet pipe, the outlet pipe being fixedly installed on the lower surface of the tube body, a baffle fixedly installed inside the outlet pipe, the baffle dividing the outlet pipe into a recovery chamber and an exhaust chamber, a rotating groove opened on the side wall of the baffle, and an adjusting plate rotatably installed in the rotating groove, the outlet direction being changed by adjusting the plate.

[0006] Furthermore, a recovery pipe is fixedly installed on the arc-shaped side wall of the exhaust pipe, and the other end of the recovery pipe is fixedly installed on the side wall of the pipe body.

[0007] Furthermore, one end of the recovery pipe is connected to the recovery chamber, and the other end of the recovery pipe is connected to the heat exchange chamber.

[0008] Furthermore, a rotating hole is provided on the arc-shaped sidewall of the tube to connect to the heat exchange chamber, and one end of the mounting shaft is rotatably installed in the rotating hole.

[0009] Furthermore, the mounting shaft includes a connecting plate, and the side wall of the mounting shaft has a mounting hole, in which the heat exchange tube is fixedly installed.

[0010] Furthermore, one end of the heat exchange tube has an S-shaped structure, with one end wrapped around the connecting plate and the other end exposed to the outside through the mounting hole.

[0011] Furthermore, a through groove is provided on the upper surface of the adjustment plate. The through groove has a semi-circular structure, and a rotating shaft is fixedly installed at the center of the lower surface of the adjustment plate.

[0012] Furthermore, a shaft hole with a connecting rotating groove is provided at the center of the lower surface of the air outlet pipe. The rotating shaft is rotatably installed at the shaft hole and passes through the shaft hole to the outside.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] In this invention, by connecting the inlet pipe to an annealing furnace, high-temperature gas from the furnace enters the heat exchange chamber through the inlet pipe. The high-temperature gas heats the heat exchange tubes, ensuring full contact between the S-shaped tubes and the gas. Rotation of the mounting shaft drives the heat exchange tubes to rotate, with one end of the tube exposed through the mounting hole to transfer heat. The S-shaped winding design of the heat exchange tubes significantly increases the contact area with the high-temperature gas. The mounting shaft drives the rotation of the heat exchange tubes, forcibly disturbing the airflow, breaking the boundary layer effect, increasing heat exchange efficiency, and significantly improving heat utilization efficiency. Dynamic rotation prevents heat accumulation and avoids localized overheating damage to the heat exchange tubes. The centrifugal force generated by the rotation removes accumulated dust and oxide scale from the surface of the heat exchange tubes, avoiding the clogging problems common in traditional fixed heat exchangers. The high-temperature gas, after initial heat exchange, enters the outlet pipe. A baffle is fixedly installed inside the exhaust pipe, dividing the exhaust pipe into a recovery chamber and an exhaust chamber. A rotating groove is opened on the side wall of the baffle, and an adjusting plate is rotatably installed in the rotating groove. The direction of the exhaust gas is changed by adjusting the plate. One end of the recovery pipe is connected to the recovery chamber, and the other end is connected to the heat exchange chamber. High-temperature gas returns to the heat exchange chamber through the recovery pipe and exchanges heat with the heat exchange pipe again. When the high-temperature gas cools down to a certain temperature, the rotating shaft is rotated to adjust the position of the adjusting plate so that the groove is aligned with the exhaust chamber to discharge the gas. The high-temperature gas returns to the heat exchange chamber through the recovery pipe for secondary heat exchange, realizing the cascade utilization of thermal energy and improving the waste heat recovery rate. By rotating the adjusting plate to change the position of the groove, the airflow can be flexibly distributed to the recovery chamber and the exhaust chamber to adapt to different working conditions. Multiple heat exchanges reduce the exhaust gas temperature and reduce the thermal shock to subsequent pipelines and equipment. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of the recycling device in a preferred embodiment of the present invention;

[0016] Figure 2 This is a cross-sectional view of the recycling device in a preferred embodiment of the present invention;

[0017] Figure 3 This is a schematic diagram of the cross-sectional structure of the tube in a preferred embodiment of the present invention;

[0018] Figure 4 This is a schematic diagram of the mounting shaft structure in a preferred embodiment of the present invention;

[0019] Figure 5 This is a schematic diagram of the connecting plate structure in a preferred embodiment of the present invention;

[0020] Figure 6 This is a schematic diagram of the adjustment plate structure in a preferred embodiment of the present invention.

[0021] Figure label:

[0022] 1. Tube body; 11. Heat exchange chamber; 12. Inlet pipe; 111. Rotation hole;

[0023] 2. Exhaust pipe; 21. Baffle; 22. Adjusting plate; 23. Recovery pipe; 211. Recovery chamber; 212. Exhaust chamber; 213. Rotating groove; 214. Shaft hole; 221. Through groove; 222. Rotating shaft;

[0024] 3. Mounting shaft; 31. Connecting plate; 32. Heat exchange tube; 311. Mounting hole. Detailed Implementation

[0025] To further illustrate the technical means and effects adopted by this utility model in order to achieve the intended utility model purpose, the following detailed description of the specific implementation methods, structure, features and effects of this utility model is provided in conjunction with the accompanying drawings and preferred embodiments.

[0026] This embodiment provides a waste heat recovery device for an annealing furnace, including a tube body 1, an inlet pipe 12 fixedly installed on the upper surface of the tube body 1, a heat exchange chamber 11 opened inside the tube body 1, an installation shaft 3 rotatably installed inside the heat exchange chamber 11, a heat exchange tube 32 fixedly installed on the installation shaft 3, and also including an outlet pipe 2, the outlet pipe 2 is fixedly installed on the lower surface of the tube body 1, a baffle 21 is fixedly installed inside the outlet pipe 2, the baffle 21 divides the outlet pipe 2 into a recovery chamber 211 and an exhaust chamber 212, a rotating groove 213 is opened on the side wall of the baffle 21, an adjusting plate 22 is rotatably installed in the rotating groove 213, and the outlet direction is changed by adjusting the adjusting plate 22;

[0027] like Figure 1 , Figure 2 As shown, a recovery pipe 23 is fixedly installed on the arc-shaped side wall of the air outlet pipe 2, and the other end of the recovery pipe 23 is fixedly installed on the side wall of the pipe body 1.

[0028] like Figure 2 , Figure 3 As shown, one end of the recovery pipe 23 is connected to the recovery chamber 211, and the other end of the recovery pipe 23 is connected to the heat exchange chamber 11. A check valve is fixedly installed inside the upper end of the recovery pipe 23 to control the gas to flow unidirectionally from the recovery chamber 211 to the heat exchange chamber 11. The high-temperature gas returns to the heat exchange chamber 11 through the recovery pipe 23 and exchanges heat with the heat exchange pipe 32 again, realizing the cascade utilization of heat energy, improving the waste heat recovery rate, and reducing the exhaust gas temperature through multiple heat exchanges, thus reducing the thermal shock to subsequent pipelines and equipment.

[0029] like Figure 3 As shown, a rotating hole 111 is provided on the arc-shaped side wall of the tube body 1, which connects to the heat exchange chamber 11. One end of the mounting shaft 3 is rotatably installed in the rotating hole 111. The mounting shaft 3 drives the heat exchange tube 32 to rotate, which forcibly disturbs the airflow, breaks the boundary layer effect, increases the heat exchange efficiency, and significantly improves the heat utilization efficiency. The dynamic rotation avoids heat accumulation and prevents local overheating damage to the heat exchange tube 32. The centrifugal force generated by the rotation can remove the dust and oxide scale on the surface of the heat exchange tube 32, avoiding the clogging problem common in traditional fixed heat exchangers.

[0030] like Figure 5 As shown, the mounting shaft 3 includes a connecting plate 31, and a mounting hole 311 is provided on the side wall of the mounting shaft 3. The heat exchange tube 32 is fixedly installed in the mounting hole 311 in the middle.

[0031] like Figure 4 As shown, one end of the heat exchange tube 32 has an S-shaped structure. One end of the heat exchange tube 32 is wound around the connecting plate 31, and the other end of the heat exchange tube 32 passes through the mounting hole 311 and is exposed to the outside. The other end of the heat exchange tube 32 is connected to other equipment to transfer heat energy. The heat exchange tube 32 adopts an S-shaped winding design, which greatly increases the contact area with high-temperature gas.

[0032] like Figure 6 As shown, a through groove 221 is provided on the upper surface of the regulating plate 22. The through groove 221 has a semi-circular structure. A rotating shaft 222 is fixedly installed at the center of the lower surface of the regulating plate 22. The rotating shaft 222 is rotated to adjust the position of the regulating plate 22, so that the through groove 221 is aligned with the exhaust chamber 212 to discharge gas. The high-temperature gas returns to the heat exchange chamber 11 for secondary heat exchange through the recovery pipe 23, realizing the cascade utilization of heat energy and improving the waste heat recovery rate. By rotating the regulating plate 22 to change the position of the through groove 221, the airflow can be flexibly distributed to the recovery chamber 211 and the exhaust chamber 212 to adapt to different working conditions. Multiple heat exchange reduces the exhaust gas temperature and reduces the thermal shock to subsequent pipelines and equipment.

[0033] like Figure 2 , Figure 3 As shown, a shaft hole 214 communicating with a rotating groove 213 is provided at the center of the lower surface of the air outlet pipe 2. The rotating shaft 222 is rotatably installed at the shaft hole 214. The rotating shaft 222 passes through the shaft hole 214 and is exposed to the outside. The rotating shaft 222 is rotated from the exposed rotating shaft 222 to drive the adjusting plate 22 to rotate.

[0034] In practical use, the inlet pipe 12 is connected to an annealing furnace. High-temperature gas from the annealing furnace enters the heat exchange chamber 11 through the inlet pipe 12, heating the heat exchange tube 32. The S-shaped heat exchange tube 32 is in full contact with the high-temperature gas. The mounting shaft 3 rotates to drive the heat exchange tube 32 to rotate. One end of the heat exchange tube 32 passes through the mounting hole 311 and is exposed to the outside to transfer heat energy. The S-shaped winding design of the heat exchange tube 32 significantly increases the contact area with the high-temperature gas. The mounting shaft 3 drives the heat exchange tube 32 to rotate, forcibly disturbing the airflow, breaking the boundary layer effect, increasing heat exchange efficiency, and significantly improving heat utilization efficiency. Dynamic rotation avoids heat accumulation and prevents local overheating damage to the heat exchange tube 32. The centrifugal force generated by the rotation can remove accumulated dust and oxide scale from the surface of the heat exchange tube 32, avoiding the common clogging problem of traditional fixed heat exchangers. The high-temperature gas, after preliminary heat exchange, enters the outlet pipe 2. A baffle 21 is fixedly installed inside the outlet pipe 2. The outlet pipe 21 is divided into a recovery chamber 211 and an exhaust chamber 212. A rotating groove 213 is provided on the side wall of the baffle 21. An adjusting plate 22 is rotatably installed in the rotating groove 213. The direction of the gas outlet is changed by adjusting the adjusting plate 22. One end of the recovery pipe 23 is connected to the recovery chamber 211, and the other end of the recovery pipe 23 is connected to the heat exchange chamber 11. The high-temperature gas returns to the heat exchange chamber 11 through the recovery pipe 23 and exchanges heat with the heat exchange pipe 32 again. When the high-temperature gas drops to a certain temperature, the rotating shaft 222 is rotated to adjust the position of the adjusting plate 22 so that the through groove 221 is aligned with the exhaust chamber 212 to discharge the gas. The high-temperature gas returns to the heat exchange chamber 11 through the recovery pipe 23 for secondary heat exchange, realizing the cascade utilization of thermal energy and improving the waste heat recovery rate. By rotating the adjusting plate 22 to change the position of the through groove 221, the airflow is flexibly distributed to the recovery chamber 211 and the exhaust chamber 212 to adapt to different working conditions. Multiple heat exchanges reduce the exhaust gas temperature and reduce the thermal shock to subsequent pipelines and equipment.

[0035] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A waste heat recovery device for an annealing furnace, comprising a tube body (1), characterized in that, An air inlet pipe (12) is fixedly installed on the upper surface of the pipe body (1). A heat exchange chamber (11) is opened inside the pipe body (1). An installation shaft (3) is rotatably installed inside the heat exchange chamber (11). A heat exchange pipe (32) is fixedly installed on the installation shaft (3). The pipe body (1) also includes: An exhaust pipe (2) is fixedly installed on the lower surface of the pipe body (1). A baffle (21) is fixedly installed inside the exhaust pipe (2). The baffle (21) divides the exhaust pipe (2) into a recovery chamber (211) and an exhaust chamber (212). A rotating groove (213) is provided on the side wall of the baffle (21). An adjusting plate (22) is rotatably installed inside the rotating groove (213). The direction of exhaust is changed by adjusting the plate (22).

2. The annealing furnace waste heat recovery device according to claim 1, characterized in that, A recovery pipe (23) is fixedly installed on the arc-shaped side wall of the air outlet pipe (2), and the other end of the recovery pipe (23) is fixedly installed on the side wall of the pipe body (1).

3. The annealing furnace waste heat recovery device according to claim 2, characterized in that, One end of the recovery pipe (23) is connected to the recovery chamber (211), and the other end of the recovery pipe (23) is connected to the heat exchange chamber (11).

4. The annealing furnace waste heat recovery device according to claim 1, characterized in that, The tube body (1) has a rotating hole (111) on its arc-shaped sidewall that connects to the heat exchange chamber (11), and one end of the mounting shaft (3) is rotatably installed in the rotating hole (111).

5. The annealing furnace waste heat recovery device according to claim 1, characterized in that, The mounting shaft (3) includes a connecting plate (31), and a mounting hole (311) is provided on the side wall of the mounting shaft (3). The heat exchange tube (32) is fixedly installed in the mounting hole (311) in the middle.

6. The annealing furnace waste heat recovery device according to claim 1, characterized in that, One end of the heat exchange tube (32) has an S-shaped structure. One end of the heat exchange tube (32) is wrapped around the connecting plate (31), and the other end of the heat exchange tube (32) passes through the mounting hole (311) and is exposed to the outside.

7. The annealing furnace waste heat recovery device according to claim 1, characterized in that, The upper surface of the adjusting plate (22) is provided with a through groove (221), which is a semi-circular structure. A rotating shaft (222) is fixedly installed at the center of the lower surface of the adjusting plate (22).

8. The annealing furnace waste heat recovery device according to claim 1, characterized in that, The lower surface of the air outlet pipe (2) is provided with a shaft hole (214) that connects to the rotating groove (213). The rotating shaft (222) is rotatably installed in the shaft hole (214) and the rotating shaft (222) passes through the shaft hole (214) and is exposed to the outside.

Images