Energy-saving waste heat recovery device of annealing furnace

Abstract

The utility model relates to a waste heat recovery device, in particular to an annealing furnace energy-saving waste heat recovery device which comprises a heating box, one end of the heating box is fixedly connected with a cooling box, one end, far away from the cooling box, of the heating box is rotatably connected with an inlet protective door, and one end, far away from the heating box, of the cooling box is rotatably connected with an outlet protective door. Conveying belts are arranged in the heating box and the cooling box, a thermocouple is arranged in the heating box, a gas pipeline is arranged on one side of the cooling box, and a burner is fixedly connected to the side wall of the gas pipeline. Through mutual cooperation of the thermocouple, the induced draft fan, the heat transfer pipe and other parts, heat dissipated by the slow cooling section of the cooling box is recycled, the fuel gas consumption cost is reduced, and the energy utilization efficiency is improved.

Description

Technical Field

[0001] This utility model relates to a waste heat recovery device, and more particularly to an energy-saving waste heat recovery device for an annealing furnace. Background Technology

[0002] An annealing furnace is a heat treatment device for metallic materials. It involves slowly heating metal parts to a specific temperature, holding them at that temperature for a period of time, and then cooling them at a suitable rate. This process reduces the hardness and brittleness of the metal, enhances its plasticity and toughness, improves the uniformity of its chemical composition, removes residual stress, or achieves desired physical properties. Annealing furnaces are widely used in various industries such as steel, aerospace manufacturing, and automobiles, and are of great significance for the processing and performance improvement of metallic materials.

[0003] Traditional annealing furnaces primarily rely on external energy sources such as natural gas and fuel oil for heating and heat preservation. Heat is transferred through burners to maintain or raise the furnace temperature, thus achieving the heating and heat preservation treatment of the workpieces. This method results in a significant amount of preheating during the cooling of metal parts. Traditional annealing furnaces cannot effectively recover and utilize this waste heat, leading to relatively low energy efficiency. A large amount of heat is lost to the environment in the form of flue gas, resulting in energy waste and increased production costs.

[0004] Therefore, it is necessary to design an energy-saving waste heat recovery device for annealing furnaces. Utility Model Content

[0005] In order to overcome the shortcomings of traditional annealing furnaces, which cannot effectively recover and utilize waste heat and have a high energy waste rate, the technical problem to be solved by this utility model is to provide an energy-saving waste heat recovery device for annealing furnaces.

[0006] The technical solution of this utility model is: an energy-saving waste heat recovery device for an annealing furnace, comprising a heating box, a cooling box fixedly connected to one end of the heating box, an inlet protective door rotatably connected to the end of the heating box away from the cooling box, and an outlet protective door rotatably connected to the end of the cooling box away from the heating box. Conveyor belts are installed inside both the heating box and the cooling box. A thermocouple is installed inside the heating box. A gas pipeline is installed on one side of the cooling box, and a burner is fixedly connected to the side wall of the gas pipeline. The end of the burner away from the gas pipeline is fixedly connected to the heating box. An induced draft fan is installed on one side of the cooling box, with the fan's air inlet extending into the cooling box. A heat transfer pipe is fixedly connected to the fan's air outlet. An air outlet is fixedly connected to the top of the heating box, and the heat transfer pipe communicates with the heating box through the air outlet. The thermocouple is electrically connected to the induced draft fan.

[0007] To further explain, a combustion-supporting fan is installed on the top of the cooling box, and the output end of the combustion-supporting fan is connected to the gas pipeline.

[0008] To further explain, the heating chamber is equipped with an electric lifting door, which divides the heating chamber into two parts: a heating section and a heat preservation section.

[0009] To further explain, the heat transfer pipe is equipped with an electric regulating valve for controlling the flow and blockage of the heat transfer pipe.

[0010] To further explain, a rapid cooling nozzle is installed on one side of the cooling box for cooling. The rapid cooling nozzle divides the cooling box into a rapid cooling section and a slow cooling section according to the cooling efficiency.

[0011] To further explain, the burner is equipped with a gas valve for controlling burner flow; the gas valve is an electrically controlled valve.

[0012] The beneficial effects of this utility model are as follows: 1. This utility model achieves the recovery and utilization of heat dissipated from the slow cooling section of the cooling box by cooperating with components such as thermocouples, induced draft fans and heat transfer pipes, thereby reducing gas consumption costs and improving energy utilization efficiency.

[0013] 2. This utility model can control the heat transfer by controlling the gas valve on the burner, so as to meet the different heat requirements of the heating section and the heat preservation section inside the heating box.

[0014] 3. This utility model, through the design of the rapid cooling nozzle, allows metal workpieces to flexibly choose between rapid cooling and natural cooling, meeting the needs of different heat treatment processes. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0016] Figure 2 This is a three-dimensional structural cross-sectional view of the heating box of this utility model.

[0017] Figure 3 This is a three-dimensional structural cross-sectional view of the cooling box of this utility model.

[0018] Figure 4 This is a three-dimensional structural diagram of the quenching nozzle and induced draft fan of this utility model.

[0019] The markings in the attached diagram are: 1-Heating box, 2-Cooling box, 3-Inlet protective door, 4-Conveyor belt, 5-Gas pipeline, 6-Burner, 7-Thermocouple, 8-Combustion fan, 9-Induced draft fan, 10-Heat transfer pipe, 11-Outlet nozzle, 12-Outlet protective door, 13-Electric lifting door, 14-Electric regulating valve, 15-Quick cooling nozzle, 16-Gas valve. Detailed Implementation

[0020] The present invention will now be described more fully below with reference to the accompanying drawings, in which presently preferred embodiments of the invention are shown. However, the present invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided for thoroughness and completeness and to fully convey the scope of the invention to those skilled in the art.

[0021] Example: An energy-saving waste heat recovery device for an annealing furnace, such as Figures 1-4 As shown, the device includes a heating chamber 1, a cooling chamber 2 fixedly connected to one end of the heating chamber 1, an inlet protective door 3 rotatably connected to the end of the heating chamber 1 away from the cooling chamber 2, and an outlet protective door 12 rotatably connected to the end of the cooling chamber 2 away from the heating chamber 1. Conveyor belts 4 are installed inside both the heating chamber 1 and the cooling chamber 2. A thermocouple 7 is installed inside the heating chamber 1. A gas pipeline 5 is installed on one side of the cooling chamber 2, and a burner 6 is fixedly connected to the side wall of the gas pipeline 5. The end of the burner 6 away from the gas pipeline 5 is fixedly connected to the heating chamber 1. A blower 9 is installed on one side of the cooling box 2. The air outlet of the blower 9 extends into the interior of the cooling box 2. A heat transfer pipe 10 is fixedly connected to the air outlet of the blower 9. An air outlet 11 is fixedly connected to the top of the heating box 1. The heat transfer pipe 10 is connected to the heating box 1 through the air outlet 11. The thermocouple 7 is electrically connected to the blower 9. Here, two air outlets 11 are installed on the top of the heating box 1, and the air outlets 11 are located below the gas pipeline 5. The heat transfer pipe 10 is a Y-shaped pipe, and the air outlets on both sides of the heat transfer pipe 10 are connected to the two air outlets 11 respectively.

[0022] like Figure 1 and Figure 3 As shown, a combustion-supporting fan 8 is installed on the top of the cooling box 2. The output end of the combustion-supporting fan 8 is connected to the gas pipeline 5. Here, when the combustion-supporting fan 8 is started, the combustion-supporting fan 8 can deliver combustion-supporting air into the gas pipeline 5, effectively improving the combustion efficiency of the gas inside the gas pipeline 5, thereby improving the heat transfer efficiency and working efficiency.

[0023] like Figure 2 As shown, the heating chamber 1 is equipped with an electric lifting door 13, which divides the heating chamber 1 into a heating section and a heat preservation section. Here, the electric lifting door 13 is located in the middle of the heating chamber 1. When the electric lifting door 13 is activated, it is designed to separate the space and prevent heat loss from the heating section and heat preservation section of the heating chamber 1, thereby improving energy utilization. When the electric lifting door 13 is retracted, it no longer separates the heating section and heat preservation section of the heating chamber 1, allowing objects on the heating section to enter the heat preservation section. The connection between the heating chamber 1 and the cooling chamber 2 is also equipped with an electric lifting door 13.

[0024] like Figure 4As shown, the heat transfer pipe 10 is equipped with an electric regulating valve 14 for controlling the opening and closing of the heat transfer pipe 10. Here, by controlling the electric regulating valve 14, the waste heat can be transferred to the heating section and the heat preservation section of the heating box 1 respectively, so as to achieve precise control of heat transfer and meet the different heat requirements of the heating section and the heat preservation section inside the heating box.

[0025] like Figure 4 As shown, a rapid cooling nozzle 15 for cooling is provided on one side of the interior of the cooling box 2. The rapid cooling nozzle 15 divides the cooling box 2 into a rapid cooling section and a slow cooling section according to the cooling efficiency. Here, by connecting the external cooling equipment to the rapid cooling nozzle 15, the cooling equipment delivers cold air to the rapid cooling nozzle 15, and the rapid cooling nozzle 15 delivers the cold air to the metal workpiece, so that the metal workpiece is rapidly cooled by the action of the cold air.

[0026] like Figures 1-2 As shown, the burner 6 is equipped with a gas valve 16 for controlling the opening and closing of the burner 6. The gas valve 16 is an electrically controlled valve. Here, by controlling the gas valve 16 of the burner 6 in the heat preservation section, the heat in the gas pipeline 5 can flow evenly and stably to the heat preservation section or the heating section, so as to achieve precise control of heat transfer and meet the different heat requirements of the heating section and the heat preservation section inside the heating box.

[0027] This device is used for heat treatment of metals. In use, the inlet protective door 3 is flipped outwards to remove it from the heating chamber 1, thus opening it. The metal workpiece is then placed on the conveyor belt 4 inside the heating chamber 1. The inlet protective door 3 is then rotated again to close the heating chamber 1. The gas in the gas pipeline 5 is then ignited, releasing heat through combustion. This heat enters the heating chamber 1 via the burner 6 connected to the gas pipeline 5. The heat flows into the heating chamber 1 and heats the heating section, thereby heating the metal workpiece. Heat is applied to the insulation section of the heating chamber 1 to preheat it. Once the metal workpiece in the heating section reaches the predetermined heating time, the conveyor belt 4 starts, transporting the metal workpiece towards the insulation section. Simultaneously, the electric lifting door 13 starts, no longer separating the heating and insulation sections, allowing the conveyor belt 4 to transport the metal workpiece to the insulation section. Then, the electric lifting door 13 separates the heating and insulation sections of the heating chamber 1 again. Subsequently, by controlling the gas valve 16 of the burner 6 in the insulation section, the heat in the gas pipeline 5 is released... The air flows evenly and stably to the insulation section, thus maintaining the temperature of the metal workpiece. Then, the electric lifting door 13 between the insulation section and the cooling box 2 is activated, allowing the metal workpiece on the conveyor belt 4 to pass through the electric lifting door 13 and enter the cooling box 2. When rapid cooling of the metal workpiece is required, the conveyor belt 4 transports the metal workpiece to the rapid cooling section equipped with rapid cooling nozzles 15. Subsequently, external cooling equipment can be connected to the rapid cooling nozzles 15, supplying cold air to them. The rapid cooling nozzles 15 then deliver the cold air to the metal workpiece, allowing the metal workpiece to be rapidly cooled. Rapid cooling: When rapid cooling is not required, the conveyor belt 4 transports the metal workpiece to the slow cooling section on the other side of the cooling box 2 for natural cooling. When the thermocouple 7 detects that the temperature of the insulation section of the heating box 1 is lower than the set threshold by relying on the thermoelectric effect, the thermocouple 7 sends an electrical signal to the induced draft fan 9. The control unit inside the induced draft fan 9 receives the signal and starts. The induced draft fan 9 extracts the heat emitted by the slow cooling section of the cooling box 2 and transmits the heat through the heat transfer pipe 10 to the air outlet 11, and then enters the heating box 1 from the air outlet 11, thereby recovering and utilizing the waste heat and reducing the cost of gas consumption.

[0028] The technical principles of the present invention have been described above with reference to specific embodiments. These descriptions are merely for explaining the principles of the present invention and should not be construed as limiting the scope of protection of the present invention in any way. Based on this explanation, those skilled in the art can conceive of other specific embodiments of the present invention without creative effort, and these embodiments will all fall within the scope of protection of the present invention.

Claims

1. An energy-saving waste heat recovery device for an annealing furnace, comprising a heating box (1), a cooling box (2) fixedly connected to one end of the heating box (1), an inlet protective door (3) rotatably connected to the end of the heating box (1) away from the cooling box (2), an outlet protective door (12) rotatably connected to the end of the cooling box (2) away from the heating box (1), and conveyor belts (4) provided inside both the heating box (1) and the cooling box (2), characterized in that, Thermocouple (7) is installed inside the heating box (1). Gas pipe (5) is installed on one side of the cooling box (2). Burner (6) is fixedly connected to the side wall of the gas pipe (5). The end of the burner (6) away from the gas pipe (5) is fixedly connected to the heating box (1). Exhaust fan (9) is installed on one side of the cooling box (2). The exhaust port of exhaust fan (9) extends into the cooling box (2). Heat transfer pipe (10) is fixedly connected to the exhaust port of exhaust fan (9). Air outlet (11) is fixedly connected to the top of the heating box (1). Heat transfer pipe (10) is connected to heating box (1) through air outlet (11). Thermocouple (7) is electrically connected to exhaust fan (9).

2. The energy-saving waste heat recovery device for an annealing furnace according to claim 1, characterized in that, A combustion-supporting fan (8) is installed on the top of the cooling box (2), and the output end of the combustion-supporting fan (8) is connected to the gas pipeline (5).

3. The energy-saving waste heat recovery device for an annealing furnace according to claim 2, characterized in that, The heating box (1) is equipped with an electric lifting door (13), which divides the heating box (1) into a heating section and a heat preservation section.

4. An energy-saving waste heat recovery device for an annealing furnace according to claim 3, characterized in that, An electric regulating valve (14) is provided on the heat transfer pipe (10) for controlling the opening and closing of the heat transfer pipe (10).

5. An energy-saving waste heat recovery device for an annealing furnace according to claim 4, characterized in that, The cooling box (2) is equipped with a rapid cooling nozzle (15) on one side for cooling. The cooling box (2) is divided into a rapid cooling section and a slow cooling section according to the cooling efficiency through the rapid cooling nozzle (15).

6. An energy-saving waste heat recovery device for an annealing furnace according to claim 5, characterized in that, The burner (6) is equipped with a gas valve (16) for controlling the opening and closing of the burner (6), and the gas valve (16) is an electrically controlled valve.

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