Waste heat recovery device of hot galvanizing annealing furnace

Abstract

The utility model discloses a hot galvanizing annealing furnace waste heat recovery device which comprises an annealing assembly, an air return assembly fixed to the top of the annealing assembly, a heat preservation assembly fixed to one side of the annealing assembly, a water flowing assembly fixed in the heat preservation assembly, the air return assembly comprises an air suction pipe fixed to the top of the annealing assembly, and a supporting table fixed to the top of the air suction pipe. A first motor is fixed to the top of the supporting table, a gear is fixed to the output shaft end of the first motor, a supporting frame is fixed into the exhaust pipe, a rotating shaft is rotationally connected into the supporting frame, fan blades are fixed to the end of the rotating shaft, coronal teeth are fixed to one side of the rotating shaft and meshed with the gear, and the annealing assembly comprises a furnace body. According to the utility model, the water temperature can be raised through the flowing of gas, so that the heat of the annealing furnace is utilized, and conversely, the annealing furnace can be preheated by utilizing the flowing of high-temperature water, so that a metal piece is prevented from abnormally changing due to sudden temperature rise.

Description

Technical Field

[0001] This utility model relates to the field of annealing furnace technology, and in particular to a waste heat recovery device for hot-dip galvanizing annealing furnaces. Background Technology

[0002] Annealing is a metal heat treatment process that involves slowly heating metal to a certain temperature, holding it for a sufficient time, and then cooling it at a suitable rate, sometimes naturally, and sometimes with controlled cooling. The purposes of annealing include: reducing hardness, softening the workpiece, improving machinability; reducing workpiece defects and residual stress; homogenizing material structure and composition, improving material properties, or preparing for subsequent heat treatment. Annealing furnaces are widely used in industries such as casting, metallurgy, automotive, aerospace, military, shipbuilding, light industry, and power generation.

[0003] Chinese Patent No. CN217077675U discloses a waste heat collection device at the bottom of an annealing furnace in a galvanizing line. The device includes an annealing furnace with a feed inlet on one side, rollers evenly spaced on both sides of the furnace, and a base supporting the furnace at its bottom. Through the arrangement of the annealing furnace, rollers, and base, the waste heat-laden flue gas is first transported to a heat exchanger before being discharged, where it exchanges heat with cold air supplied from the outside. The heat-exchanged flue gas is then discharged, and the cold air is transported to the annealing furnace or other production lines. This effectively improves the utilization rate of waste heat, thereby achieving energy saving and emission reduction. The annealing furnace, filter assembly, and limiting assembly ensure that the flue gas and cold air are filtered before being supplied to the heat exchanger, preventing impurities in the flue gas and dust in the cold air from accumulating inside the heat exchanger and causing blockage.

[0004] Existing waste heat recovery devices for hot-dip galvanizing annealing furnaces have the following problems: although they can reuse the flue gas from the annealing furnace, the reuse efficiency is low and they cannot feed back into the annealing furnace for preheating.

[0005] Therefore, it is urgent to design a waste heat recovery device for hot-dip galvanizing annealing furnaces to solve the above problems. Utility Model Content

[0006] The purpose of this utility model is to address the shortcomings of existing technologies by proposing a waste heat recovery device for hot-dip galvanizing annealing furnaces.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A waste heat recovery device for a hot-dip galvanizing annealing furnace includes an annealing assembly, a gas return assembly fixed to the top of the annealing assembly, a heat preservation assembly fixed to one side of the annealing assembly, a water flow assembly fixed inside the heat preservation assembly, and a gas return assembly including an extraction pipe fixed to the top of the annealing assembly. A support platform is fixed to the top of the extraction pipe, and a motor is fixed to the top of the support platform. A gear is fixed to the output shaft end of the motor. A support frame is fixed inside the extraction pipe, and a rotating shaft is rotatably connected inside the support frame. A fan blade is fixed to the end of the rotating shaft, and a crown tooth is fixed to one side of the rotating shaft, the crown tooth meshing with the gear.

[0009] Furthermore, the annealing assembly includes a furnace body, with a support leg fixed to the bottom of the furnace body, and a front door rotatably connected inside the furnace body.

[0010] Furthermore, a rear door is rotatably connected inside the furnace body, a placement rack is fixed inside the furnace body, and a ventilation mesh is fixed inside the placement rack.

[0011] Furthermore, the heat preservation component includes a water tank, which is fixed to one side of the furnace body, and an insulation box is fixed inside the water tank.

[0012] Furthermore, a water injection pipe is fixed to the top of the insulated box, a liquid level gauge is fixed to one side of the insulated box, and an air flow pipe is fixed inside the insulated box.

[0013] Furthermore, the water flow assembly includes a water pump, which is fixed inside the insulation box, and a second motor is fixed to one side of the water pump.

[0014] Furthermore, a return pipe is fixed to one side of the water pump, and fins are fixed to one side of the return pipe.

[0015] The beneficial effects of this utility model are as follows:

[0016] 1. By using the set return air component, the motor drives the gear to rotate, which in turn drives the shaft to rotate, thus making the fan blades rotate. When the fan blades rotate, they draw hot air from the furnace body and enter the air flow pipe through the exhaust pipe. This allows the hot air from the furnace body to heat the air flow pipe, thereby raising the temperature of the water in the insulation box. This allows the cool air to flow back into the furnace body. In this way, the interior of the furnace body can be cooled quickly, and the heat can be utilized.

[0017] 2. Through the water flow assembly, the water pump drives the water in the heat preservation box into the return pipe, so that the hot water that was originally heated by hot air can dissipate heat through the return pipe. The fins can dissipate heat to the maximum extent. Therefore, the annealing furnace can be preheated before use, thus preventing the internal temperature of the annealing furnace from rising suddenly and causing abnormal changes in the annealed metal parts.

[0018] 3. By using the heat preservation components, the material of the heat preservation box, and the gap between the heat preservation box and the water tank, the water in the heat preservation box can be kept warm for a long time after being heated by the air pipe. Therefore, even if the temperature in the annealing furnace drops to room temperature, the water in the return pipe can still preheat the annealing furnace.

[0019] 4. By using the annealing components and the front and rear doors, the annealing furnace can achieve rapid airflow by opening the front and rear doors during cooling, thereby achieving rapid annealing of metal parts. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of a waste heat recovery device for a hot-dip galvanizing annealing furnace proposed in this utility model;

[0021] Figure 2 This is a schematic diagram of the internal structure of a waste heat recovery device for a hot-dip galvanizing annealing furnace proposed in this utility model;

[0022] Figure 3 This is a schematic diagram of the return pipe of a waste heat recovery device for a hot-dip galvanizing annealing furnace proposed in this utility model;

[0023] Figure 4 This is a schematic diagram of the return gas component of a waste heat recovery device for a hot-dip galvanizing annealing furnace proposed in this utility model.

[0024] In the diagram: 1. Annealing assembly; 2. Furnace body; 3. Support leg; 4. Front door; 5. Rear door; 6. Placement rack; 7. Ventilation mesh; 8. Gas return assembly; 9. Gas pipe; 10. Support platform; 11. Motor 1; 12. Gear; 13. Support frame; 14. Shaft; 15. Fan blade; 16. Crown tooth; 17. Heat preservation assembly; 18. Water tank; 19. Insulation box; 20. Water injection pipe; 21. Liquid level gauge; 22. Gas flow pipe; 23. Water flow assembly; 24. Water pump; 25. Motor 2; 26. Return pipe; 27. Fins. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] It should be noted that when a component is described as "fixed to" another component, it can be directly on the other component or may have a component in between. When a component is considered "connected to" another component, it can be directly connected to the other component or may have a component in between. When a component is considered "set on" another component, it can be directly set on the other component or may have a component in between. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0028] Please also see Figures 1 to 4 A waste heat recovery device for a hot-dip galvanizing annealing furnace includes an annealing assembly 1, a return gas assembly 8 fixed to the top of the annealing assembly 1, a heat preservation assembly 17 fixed to one side of the annealing assembly 1, a water flow assembly 23 fixed inside the heat preservation assembly 17, a return gas assembly 8 including an extraction pipe 9, the extraction pipe 9 being fixed to the top of the annealing assembly 1, a support platform 10 fixed to the top of the extraction pipe 9, the support platform 10 serving to fix a motor 11, the motor 11 being fixed to the top of the support platform 10, a gear 12 being fixed to the output shaft end of the motor 11, a support frame 13 being fixed inside the extraction pipe 9, the support frame 13 not completely blocking the extraction pipe 9, a rotating shaft 14 being rotatably connected inside the support frame 13, a fan blade 15 being fixed to the end of the rotating shaft 14, the fan blade 15 being able to draw air from the furnace body 2 into the air flow pipe 22 by rotating, a crown tooth 16 being fixed to one side of the rotating shaft 14, the crown tooth 16 meshing with the gear 12.

[0029] Furthermore, the annealing assembly 1 includes a furnace body 2, with a support leg 3 fixed at the bottom of the furnace body 2. A front door 4 and a rear door 5 are rotatably connected inside the furnace body 2. Opening the front door 4 and the rear door 5 allows for rapid air circulation. A placement rack 6 is fixed inside the furnace body 2, and a ventilation mesh 7 is fixed inside the placement rack 6. The ventilation mesh 7 facilitates the upward rise of the heat emitted by the fins 27 and the return pipe 26 into the furnace body 2.

[0030] Furthermore, the heat preservation component 17 includes a water tank 18, which is fixed to one side of the furnace body 2. An insulation box 19 is fixed inside the water tank 18, which provides heat preservation. A water injection pipe 20 is fixed to the top of the insulation box 19, which facilitates the injection of water into the insulation box 19 to replenish the water volume in a timely manner. A level gauge 21 is fixed to one side of the insulation box 19, through which the water level in the insulation box 19 can be seen. An air flow pipe 22 is fixed inside the insulation box 19.

[0031] Furthermore, the water flow assembly 23 includes a water pump 24, which can draw water from the insulation box 19 into the return pipe 26. The water pump 24 is fixed inside the insulation box 19. A motor 25 is fixed to one side of the water pump 24, and the return pipe 26 is fixed to one side of the water pump 24. The end of the return pipe 26 is connected to the insulation box 19, and a fin 27 is fixed to one side of the return pipe 26.

[0032] Working principle: In use, first open the front door 4, then place the metal parts on the rack 6 or the ventilation mesh 7. Next, close the front door 4 and start the annealing furnace. When cooling is required inside the annealing furnace, start the motor 11. The motor 11 drives the gear 12 to rotate, which in turn drives the shaft 14 to rotate. This allows the fan blades 15 to draw in air, causing the air inside the furnace body 2 to enter the airflow pipe 22 through the exhaust pipe 9. The airflow pipe 22 dissipates heat, causing the water temperature inside the insulation box 19 to continuously rise. The heat-absorbing gas then flows back into the furnace body 2. In this way, the heat inside the furnace body 2 is effectively dissipated. In addition to efficient utilization, it can also achieve rapid cooling. When the temperature inside the furnace body 2 drops to a certain value, the hot air can no longer effectively heat the water. Therefore, the front door 4 and the rear door 5 can be opened to allow the hot air to dissipate quickly. Then, the metal parts can be removed. When new metal parts need to be put in, since the temperature of the furnace body 2 has dropped, if annealing is required, the motor 25 can be started to make the water pump 24 draw the water in the insulation box 19 into the return pipe 26. The heat in the high-temperature water is then dissipated through the return pipe 26 and the fins 27. The dissipated heat will then enter the furnace body 2 through the vent mesh 7, thereby preheating the furnace body 2.

[0033] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A waste heat recovery device for a hot-dip galvanizing annealing furnace, comprising an annealing assembly (1), characterized in that: The annealing assembly (1) is fixed with a return gas assembly (8) at the top, and a heat preservation assembly (17) is fixed on one side of the annealing assembly (1). A water flow assembly (23) is fixed inside the heat preservation assembly (17). The return gas assembly (8) includes a suction pipe (9). The suction pipe (9) is fixed at the top of the annealing assembly (1). A support platform (10) is fixed at the top of the suction pipe (9). A motor (11) is fixed at the top of the support platform (10). A gear (12) is fixed at the output shaft end of the motor (11). A support frame (13) is fixed inside the suction pipe (9). A rotating shaft (14) is rotatably connected inside the support frame (13). A fan blade (15) is fixed at the end of the rotating shaft (14). A crown tooth (16) is fixed on one side of the rotating shaft (14). The crown tooth (16) meshes with the gear (12).

2. The waste heat recovery device for a hot-dip galvanizing annealing furnace according to claim 1, characterized in that: The annealing assembly (1) includes a furnace body (2), a support leg (3) is fixed at the bottom of the furnace body (2), and a front door (4) is rotatably connected inside the furnace body (2).

3. The waste heat recovery device for a hot-dip galvanizing annealing furnace according to claim 2, characterized in that: The furnace body (2) is rotatably connected to a rear door (5), and a placement rack (6) is fixed inside the furnace body (2). A ventilation mesh (7) is fixed inside the placement rack (6).

4. The waste heat recovery device for a hot-dip galvanizing annealing furnace according to claim 2, characterized in that: The heat preservation component (17) includes a water tank (18), which is fixed to one side of the furnace body (2), and a heat preservation box (19) is fixed inside the water tank (18).

5. The waste heat recovery device for a hot-dip galvanizing annealing furnace according to claim 4, characterized in that: A water injection pipe (20) is fixed on the top of the insulated box (19), a liquid level gauge (21) is fixed on one side of the insulated box (19), and an air flow pipe (22) is fixed inside the insulated box (19).

6. The waste heat recovery device for a hot-dip galvanizing annealing furnace according to claim 5, characterized in that: The water flow assembly (23) includes a water pump (24), which is fixed inside the insulation box (19), and a motor (25) is fixed on one side of the water pump (24).

7. The waste heat recovery device for a hot-dip galvanizing annealing furnace according to claim 6, characterized in that: A return pipe (26) is fixed on one side of the water pump (24), and a fin (27) is fixed on one side of the return pipe (26).

Images