Waste heat recycling device for converter steelmaking

Abstract

The utility model discloses a converter steelmaking is with waste heat recycling device belongs to waste heat recycling technical field, aims at solving the low waste heat recovery rate of existing device, the problem of poor dust removal effect. The device includes converter body, PLC control box, waste heat recovery tank and steam turbine generator, and the high temperature flue gas of converter enters waste heat recovery tank through the gas guide pipe, and the steam is produced with the heat exchange of water body in the tank, drives steam turbine generator to generate electricity, and simultaneously, the heat exchange pipe is passed into cold water and carries out secondary heat exchange, and improves waste heat recovery efficiency. The box is equipped with the stirring rod and enhances the contact of flue gas and water body, and the soft brush cleans the heat exchange pipe, and the dirt collecting bucket and transparent blowoff pipe are convenient for collecting and cleaning dust, and the ultrasonic liquid level sensor cooperates with the liquid supplementing branch pipe, and automatically supplements water body through the PLC control box. The device improves the waste heat recovery rate through double heat exchange mode, realizes effective dust removal, and is stable in operation, and is convenient for maintenance.

Description

Technical Field

[0001] This utility model relates to the field of waste heat recovery technology, specifically a waste heat reuse device for converter steelmaking. Background Technology

[0002] Converter steelmaking uses molten iron, scrap steel, and ferroalloys as the main raw materials. Without the aid of external energy, the steelmaking process is completed in the converter by generating heat through the physical heat of the molten iron itself and the chemical reactions between the components of the molten iron. During the smelting process in the steelmaking converter, a large amount of flue gas is often generated. The flue gas temperature is high. If it is directly discharged, it will cause a great waste of energy and pollute the surrounding environment. Therefore, waste heat recovery devices are needed.

[0003] Currently, existing waste heat recovery devices for converter steelmaking have low waste heat recovery rates and cannot effectively remove dust from the flue gas, failing to meet user needs. Therefore, we propose a waste heat recovery device for converter steelmaking. Utility Model Content

[0004] The purpose of this invention is to provide a waste heat recovery device for converter steelmaking to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a waste heat recovery device for converter steelmaking, comprising a base plate, and further comprising, from left to right, a converter body, a PLC control box, a waste heat recovery box, and a steam turbine generator installed on the top of the base plate. A gas guide pipe is provided between the top of the converter body and the lower left side of the waste heat recovery box, and a steam delivery pipe is provided between the top of the waste heat recovery box and the left side of the steam turbine generator. Multiple equally spaced arc-shaped pads are fixedly connected to the upper end of the inner wall of the waste heat recovery box, and a heat exchange pipe is provided on the top of the arc-shaped pads. The upper end of the heat exchange pipe is connected to a drain pipe extending to the outside of the upper end of the waste heat recovery box, and the lower end of the heat exchange pipe is connected to a water delivery pipe extending to the outside of the lower end of the waste heat recovery box. A stirring mechanism is provided inside the waste heat recovery box to accelerate the flow of water in the converter body. A soft brush layer is also installed on the stirring mechanism to clean the surface of the heat exchange pipe.

[0006] Preferably, a sludge collection hopper is provided at the lower end of the inner cavity of the waste heat recovery box, and a transparent drain pipe extending to the outside of the lower end of the waste heat recovery box is provided at the lower end of the sludge collection hopper. The transparent drain pipe is inclined, and a manual valve body is provided at the right end of the transparent drain pipe.

[0007] Preferably, a liquid replenishment branch pipe is installed at the top of the waste heat recovery tank, and an electric control valve is installed at the outer end of the liquid replenishment branch pipe. An ultrasonic liquid level sensor extending into the inner cavity of the waste heat recovery tank is fixedly installed at the top of the waste heat recovery tank.

[0008] Preferably, the stirring mechanism includes a cross-shaped fixing frame fixed to the upper end of the inner cavity of the waste heat recovery box. The middle end of the cross-shaped fixing frame is movably connected to a rotating shaft 24 via a bearing. Multiple equally spaced stirring rods are fixedly connected to the outer surface of the rotating shaft located below the cross-shaped fixing frame. The rotating shaft is driven by a drive motor fixed to the outside of the waste heat recovery box.

[0009] Preferably, a driven bevel gear is fixedly connected to the top of the rotating shaft, and a rotating rod is fixedly connected to the drive end of the drive motor. The rotating rod passes through the interior of the waste heat recovery box and is fixedly connected to the drive bevel gear, and the drive bevel gear and the driven bevel gear mesh.

[0010] Preferably, the soft brush layer is fixed on the stirring rod and comes into contact with the surface of the heat exchange tube when the stirring rod rotates.

[0011] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0012] 1. This utility model, through the setting of the gas guide pipe, can send the high-temperature flue gas generated by the converter body into the waste heat recovery box. The high-temperature flue gas can then contact the water in the waste heat recovery box, achieving heat exchange while removing dust from the flue gas. The water is heated to generate steam, which can be sent to the steam turbine generator through the steam delivery pipe, thereby driving the steam turbine generator to work and realize the ability to generate electricity from the waste heat of the flue gas. Through the setting of the water delivery pipe, cold water can be delivered to the heat exchange tube in the waste heat recovery box after connecting the external cold water delivery pipe. The water in the heat exchange tube can then contact the flue gas and water in the waste heat recovery box, achieving the same heat exchange capability. When the water after heat exchange is discharged through the drain pipe for use, the waste heat recovery efficiency of this device can be improved through two waste heat recovery methods, and the dust in the flue gas can be removed, achieving the function of flue gas filtration, which is beneficial to people's use.

[0013] 2. This utility model, through the setting of the sludge collection hopper, can guide the dust from the flue gas filtered by the water under the influence of gravity, causing it to accumulate and settle inside the transparent drain pipe. This allows people to directly observe the sedimentation of the filtered dust. When cleaning is needed, simply open the manual valve on the right end of the transparent drain pipe, and the sediment accumulated inside the transparent drain pipe can be discharged outwards, making it convenient for people to clean the dust sediment. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0015] Figure 2 for Figure 1 A sectional view;

[0016] Figure 3This is a schematic diagram of the structure of the heat exchange tube and the liquid replenishment branch pipe in this utility model;

[0017] Figure 4 This is a schematic diagram of the cross-shaped fixing bracket and the rotating shaft in this utility model.

[0018] In the diagram: 1. Base plate; 2. Converter body; 3. Steam turbine generator; 4. Transparent drain pipe; 5. Waste heat recovery box; 6. Electrically controlled valve; 7. PLC control box; 8. Gas guide pipe; 9. Ultrasonic liquid level sensor; 10. Liquid replenishment branch pipe; 11. Steam delivery pipe; 12. Drain pipe; 13. Water delivery pipe; 14. Arc-shaped pad; 15. Sludge collection hopper; 16. Manual valve body; 17. Drive motor; 18. Heat exchange tube; 19. Fixing plate; 20. Rotating rod; 21. Drive bevel gear; 22. Driven bevel gear; 23. Cross fixing bracket; 24. Rotating shaft; 25. Stirring rod; 26. Soft brush layer. Detailed Implementation

[0019] 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.

[0020] The components of this application, including the base plate 1, converter body 2, steam turbine generator 3, transparent drain pipe 4, waste heat recovery box 5, electric control valve 6, PLC control box 7, air guide pipe 8, ultrasonic liquid level sensor 9, liquid replenishment branch pipe 10, steam conveying pipe 11, drain pipe 12, water conveying pipe 13, arc-shaped pad 14, sludge collection hopper 15, manual valve body 16, drive motor 17, heat exchange tube 18, fixing plate 19, rotating rod 20, driving bevel gear 21, driven bevel gear 22, cross fixing bracket 23, rotating shaft 24, stirring rod 25, and soft brush layer 26, are all general standard parts or parts known to those skilled in the art. Their structure and principle can be learned by those skilled in the art through technical manuals or conventional experimental methods.

[0021] Example 1

[0022] Please see Figures 1-4As shown, this utility model provides a technical solution: a waste heat recovery device for converter steelmaking, comprising a converter body 2, a PLC control box 7, a waste heat recovery box 5, and a steam turbine generator 3, which are installed sequentially from left to right on the top of the base plate 1. A gas guide pipe 8 is provided between the top of the converter body 2 and the lower left side of the waste heat recovery box 5. A steam conveying pipe 11 is provided between the top of the waste heat recovery box 5 and the left side of the steam turbine generator 3. A plurality of equally spaced arc-shaped pads 14 are fixedly connected to the upper end of the inner wall of the waste heat recovery box 5. A heat exchange pipe 18 is provided on the top of the arc-shaped pads 14. The upper end of the heat exchange pipe 18 is connected to a drain pipe 12 extending to the outside of the upper end of the waste heat recovery box 5. The lower end of the heat exchange pipe 18 is connected to a water conveying pipe 13 extending to the outside of the lower end of the waste heat recovery box 5.

[0023] This technical solution: By setting up the gas guide pipe 8, the high-temperature flue gas generated by the converter body 2 can be sent into the waste heat recovery box 5. Then, the high-temperature flue gas can come into contact with the water in the waste heat recovery box 5, realizing heat exchange and removing dust from the flue gas. After the water is heated to generate steam, the steam can be sent to the steam turbine generator 3 through the steam delivery pipe 11, thereby driving the steam turbine generator 3 to work and realize the ability to generate electricity from the waste heat of the flue gas. By setting up the water delivery pipe 13, after connecting the external cold water delivery pipe, cold water can be delivered to the heat exchange pipe 18 in the waste heat recovery box 5. Then, the water in the heat exchange pipe 18 comes into contact with the flue gas and water in the waste heat recovery box 5, which can also achieve heat exchange. When the water after heat exchange is discharged through the drain pipe 12 for use, the waste heat recovery efficiency of this device can be improved through two waste heat recovery methods, and the dust in the flue gas can be removed, which can achieve the function of flue gas filtration and benefit people's use.

[0024] Example 2

[0025] Based on Embodiment 1, this utility model is as follows: Figures 1-4 As shown, a sludge collection hopper 15 is provided at the lower end of the inner cavity of the waste heat recovery box 5. A transparent drain pipe 4 extending to the outside of the lower end of the waste heat recovery box 5 is provided at the lower end of the sludge collection hopper 15. The transparent drain pipe 4 is inclined and a manual valve body 16 is provided at the right end of the transparent drain pipe 4.

[0026] This technical solution: By setting up the sludge collection hopper 15, the dust from the filtered water can be guided under the influence of gravity and allowed to accumulate and settle inside the transparent drain pipe 4. This allows people to visually observe the dust settling. When cleaning is needed, simply open the manual valve 16 at the right end of the transparent drain pipe 4 to discharge the accumulated sediment, making it convenient for people to clean the dust and sediment.

[0027] Example 3

[0028] Based on Embodiment 1, this utility model is as follows: Figures 1-4 As shown, a liquid replenishment branch pipe 10 is connected to the outside of the waste heat recovery box 5 and extends to the upper end of the inner cavity of the waste heat recovery box 5. An electric control valve 6 is provided at one end of the liquid replenishment branch pipe 10 located outside the waste heat recovery box 5. An ultrasonic liquid level sensor 9 extending to the upper end of the inner cavity of the waste heat recovery box 5 is fixedly installed at the front end of the top of the waste heat recovery box 5.

[0029] This technical solution: By setting up the ultrasonic level sensor 9, the liquid level of the water inside the converter body 2 can be monitored in real time. When the liquid level of the water inside the converter body 2 decreases, after the PLC control box 7 processes the signal transmitted by the ultrasonic level sensor 9, the PLC control box 7 will open the electric control valve 6 at one end of the replenishment branch pipe 10. Then, the water that will be discharged through the drain pipe 12 after heat exchange can enter the converter body 2 through the replenishment branch pipe 10 to replenish the water lost due to evaporation, thus ensuring the normal operation of this device.

[0030] Example 4

[0031] Based on Embodiment 1, this utility model is as follows: Figures 1-4 As shown, a cross-shaped fixing frame 23 is fixedly connected to the upper end of the inner cavity of the waste heat recovery box 5. A rotating shaft 24 is movably connected to the middle end of the cross-shaped fixing frame 23 via a bearing. A driven bevel gear 22 is fixedly connected to the top of the rotating shaft 24. Multiple equidistant stirring rods 25 are fixedly connected to the outer surface of the rotating shaft 24 below the cross-shaped fixing frame 23. A soft brush layer 26 is provided on the side of the stirring rod 25 near the heat exchange tube 18. A fixing plate 19 is fixedly connected to the upper end of the left side of the waste heat recovery box 5. A drive motor 17 is fixedly installed on the left side of the fixing plate 19. A rotating rod 20 extending to the upper end of the inner cavity of the waste heat recovery box 5 is fixedly connected to the output end of the drive motor 17. A drive bevel gear 21 meshing with the driven bevel gear 22 is fixedly connected to the right side of the rotating rod 20.

[0032] This technical solution: By setting the cross-shaped fixing bracket 23, when the PLC control box 7 turns on the drive motor 17 to drive the rotating rod 20 and the drive bevel gear 21 to rotate, and with the meshing driven bevel gear 22, it can drive the rotating shaft 24 to rotate. When the rotating shaft 24 rotates, it will drive the stirring rod 25 and the soft brush layer 26 to rotate. The rotating stirring rod 25 can make the flue gas more fully contact the water in the waste heat recovery box 5, which can improve the waste heat recovery rate of this device. The rotating soft brush layer 26 can clean the surface of the heat exchange tube 18, avoiding the accumulation of dust in the flue gas on the surface of the heat exchange tube 18, which would reduce the efficiency of cold water heat exchange.

[0033] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A waste heat recovery device for converter steelmaking, comprising a bottom plate (1), characterized in that: It also includes, from left to right, a converter body (2), a PLC control box (7), a waste heat recovery box (5), and a steam turbine generator (3) installed on the top of the base plate (1). A gas guide pipe (8) is provided between the top of the converter body (2) and the lower left side of the waste heat recovery box (5). A steam delivery pipe (11) is provided between the top of the waste heat recovery box (5) and the left side of the steam turbine generator (3). Multiple equidistant arc-shaped pads (14) are fixedly connected to the upper end of the inner wall of the waste heat recovery box (5). A heat exchange tube (18) is provided on the top of the shaped pad (14). The upper end of the heat exchange tube (18) is connected to a drain pipe (12) extending to the outside of the upper end of the waste heat recovery box (5). The lower end of the heat exchange tube (18) is connected to a water supply pipe (13) extending to the outside of the lower end of the waste heat recovery box (5). A stirring mechanism is provided inside the waste heat recovery box (5) to accelerate the flow of water in the converter body (2). A soft brush layer (26) is also installed on the stirring mechanism to clean the surface of the heat exchange tube (18).

2. The waste heat recovery device for converter steelmaking according to claim 1, characterized in that: A sludge collection hopper (15) is provided at the lower end of the inner cavity of the waste heat recovery box (5). A transparent drain pipe (4) extending to the outside of the lower end of the waste heat recovery box (5) is provided at the lower end of the sludge collection hopper (15). The transparent drain pipe (4) is inclined. A manual valve body (16) is provided at the right end of the transparent drain pipe (4).

3. The waste heat recovery device for converter steelmaking according to claim 1, characterized in that: The top of the waste heat recovery box (5) is equipped with a liquid replenishment branch pipe (10), and an electric control valve (6) is installed at the outer end of the liquid replenishment branch pipe (10). An ultrasonic liquid level sensor (9) extending into the inner cavity of the waste heat recovery box (5) is fixedly installed on the top of the waste heat recovery box (5).

4. The waste heat recovery device for converter steelmaking according to claim 1, characterized in that: The stirring mechanism includes a cross-shaped fixing frame (23) fixed at the upper end of the inner cavity of the waste heat recovery box (5). The middle end of the cross-shaped fixing frame (23) is movably connected to a rotating shaft (24) via a bearing. The rotating shaft (24) is fixedly connected to a plurality of equally spaced stirring rods (25) on the outer surface below the cross-shaped fixing frame (23). The rotating shaft (24) is driven by a drive motor (17) fixed outside the waste heat recovery box (5).

5. The waste heat recovery device for converter steelmaking according to claim 4, characterized in that: A driven bevel gear (22) is fixedly connected to the top of the rotating shaft (24), and a rotating rod (20) is fixedly connected to the drive end of the drive motor (17). The rotating rod (20) passes into the interior of the waste heat recovery box (5) and is fixedly connected to the drive bevel gear (21). The drive bevel gear (21) and the driven bevel gear (22) mesh.

6. The waste heat recovery device for converter steelmaking according to claim 5, characterized in that: The soft brush layer (26) is fixed on the stirring rod (25) and comes into contact with the surface of the heat exchange tube (18) when the stirring rod (25) rotates.

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