Electric arc furnace exhaust gas waste heat recovery and cyclic utilization device

Abstract

The utility model discloses an electric arc furnace waste gas waste heat recovery and cyclic utilization device, which relates to the technical field of electric arc furnaces and particularly comprises a main electric arc furnace, a fixing plate is fixedly connected to the top end of one side of the electric arc furnace, an air blower is fixedly connected to the middle of the top end of the fixing plate, and an air inlet of the air blower is communicated with an air delivery pipe. An electric valve is fixedly connected to the interior of the air conveying pipe, an air inlet of the air conveying pipe penetrates through the electric arc furnace, an air outlet of the air blower communicates with an air outlet pipe, hot air containing small particles can be conveyed into the filter box through cooperation of the air blower, the air conveying pipe and the air outlet pipe, and the hot air containing the small particles is filtered through the filter screen; if too many fine particles are attached to the surface of the filter screen, the controller controls the motor to be started, the situation that the fine particles on the surface of the filter screen influence filtering of the particles in the hot air through the filter screen is avoided through cooperation of a screw and a screw block and cleaning of a scraper, and the fine particles can be collected through a collecting box.

Description

Technical Field

[0001] This utility model relates to the field of electric arc furnace technology, specifically to a device for recovering and recycling waste heat from electric arc furnace exhaust gas. Background Technology

[0002] An electric arc furnace consists of three parts: a furnace cover, a middle furnace, and a bottom furnace. The furnace cover has three electrode holes and one oxygen lance hole. The middle furnace has two symmetrical furnace doors, which are used to observe the melting state inside the furnace and to handle any abnormalities. During the raw material melting process, in order to achieve environmental protection, it is necessary to remove small particles from the batch material. Therefore, it is necessary to pipe the small particles out through a pipeline at one of the furnace doors and then remove them through a dust collector. However, in the process of removing small particles from the batch material, heat is also carried away from the furnace, which greatly reduces the heat preservation capacity of the electric arc furnace and ultimately leads to a decrease in brick quality.

[0003] Existing electric arc furnaces tend to generate high-temperature exhaust gas during use, which is often directly discharged without being able to collect and reuse the waste heat.

[0004] The electric arc furnace waste heat recovery and recycling device disclosed in Chinese utility model patent application CN 209763778 U, although it collects and utilizes the waste heat by sending the extracted waste heat back into the electric arc furnace through a conveying pipe and a return pipe, there is heat loss during the process of the waste heat passing through the conveying pipe and the return pipe, which leads to the waste of waste heat; and although the waste heat is filtered by a filter bag to remove fine particles, many fine particles will adhere to the surface of the filter bag over time, which will affect the filtration of fine particles in the waste heat. Utility Model Content

[0005] (a) Technical problems to be solved

[0006] To address the shortcomings of existing technologies, this utility model provides a device for recovering and recycling waste heat from electric arc furnace exhaust gas, thus solving the problems mentioned in the background section.

[0007] (II) Technical Solution

[0008] To achieve the above objectives, this utility model is implemented through the following technical solution: it includes a main electric arc furnace, a fixing plate is fixedly connected to the top of one side of the electric arc furnace, a blower is fixedly connected to the middle of the top of the fixing plate, the air inlet of the blower is connected to a gas supply pipe, an electric valve is fixedly connected inside the gas supply pipe, the air inlet of the gas supply pipe passes through the electric arc furnace, and the air outlet of the blower is connected to an air outlet pipe.

[0009] Optionally, the outlet of the air outlet pipe is connected to a filter box, the fixing plate is fixedly connected to the filter box, the outlet of the filter box is connected to a circulation pipe, and the outlet of the circulation pipe is connected to the electric arc furnace.

[0010] Optionally, a heating tube is fixedly connected to the outer surface of the gas supply pipe, the gas outlet pipe and the circulation pipe, and the interior of the heating tube is hollow.

[0011] Optionally, the air outlet of the heating pipe is connected to a heating pipe, and the water outlet of the heating pipe is connected to a water outlet pipe. Both the water outlet pipe and the heating pipe are fixedly connected to valves inside.

[0012] Optionally, L-shaped support columns are fixedly connected to both sides of the bottom end of the electric arc furnace.

[0013] Optionally, a motor is fixedly connected to one top side of the filter box, and one side of the output shaft of the motor passes through the filter box and is fixedly connected to a screw, which is rotatably connected to the filter box.

[0014] Optionally, a screw block is threaded onto the surface of the screw, a scraper is fixedly connected to the bottom end of the screw block, and a filter screen is fixedly connected to the center of the filter box, with the scraper in contact with the filter screen.

[0015] Optionally, a collection box is slidably connected to the bottom of the filter box, one end of the collection box passes through the filter box and is fixedly connected to a pull ring, and a controller is fixedly connected to the bottom of the other side of the filter box.

[0016] (III) Beneficial Effects

[0017] This utility model provides a device for recovering and recycling waste heat from electric arc furnace exhaust gas, which has the following beneficial effects:

[0018] 1. This waste heat recovery and recycling device for electric arc furnace exhaust gas adds clean water to the heating pipe through the water outlet pipe. The controller opens the electric valve of the gas supply pipe. Through the cooperation of the gas supply pipe, the gas outlet pipe, and the circulation pipe, hot air can be transported back to the electric arc furnace, performing the first level of recovery and utilization of the waste heat in the electric arc furnace. During the transportation of hot air through the gas supply pipe, the gas outlet pipe, and the circulation pipe, the heat lost can heat the clean water inside the heating pipe. By controlling the valve of the water outlet pipe, hot water can be provided for workers to drink. The hot air generated by the heated water is connected to the heating pipe through the heating pipe to provide heating for the workplace. This is the second level of recovery and utilization of waste heat during the waste heat transmission process.

[0019] 2. This waste heat recovery and recycling device for electric arc furnace exhaust gas, through the cooperation of a blower, air supply pipe and air outlet pipe, can transport hot air containing small particles to the filter box. The hot air containing small particles is filtered through the filter screen. If too many fine particles are attached to the surface of the filter screen, the controller starts the motor. Through the cooperation of the screw and screw block, and the cleaning by the scraper, the fine particles on the surface of the filter screen are prevented from affecting the filter screen's ability to filter particles in the hot air. The fine particles can be collected through the collection box. Attached Figure Description

[0020] Figure 1 This is a three-dimensional structural schematic diagram of the present utility model;

[0021] Figure 2 This is a schematic diagram of the main structure of this utility model;

[0022] Figure 3 This is a schematic front cross-sectional view of the structural part of this utility model;

[0023] Figure 4 This is a schematic front cross-sectional view of the structural part of this utility model;

[0024] Figure 5 This is a top view of the structure of this utility model;

[0025] Figure 6 This is a side view of the structure of this utility model.

[0026] In the diagram: 1. L-shaped support column; 3. Electric arc furnace; 6. Heating tube; 7. Blower; 8. Heating pipe; 10. Filter box; 11. Electric motor; 12. Water outlet pipe; 13. Collection box; 14. Pull ring; 15. Fixing plate; 16. Circulation pipe; 17. Gas supply pipe; 18. Gas outlet pipe; 19. Screw; 20. Screw block; 21. Filter screen; 22. Scraper. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0028] Example 1

[0029] Please see Figures 1 to 6This utility model provides a technical solution: a waste heat recovery and recycling device for electric arc furnace exhaust gas, including a main electric arc furnace 3. A fixing plate 15 is fixedly connected to the top of one side of the electric arc furnace 3. A blower 7 is fixedly connected to the middle of the top of the fixing plate 15. The air inlet of the blower 7 is connected to a gas supply pipe 17. An electric valve is fixedly connected inside the gas supply pipe 17. The air inlet of the gas supply pipe 17 passes through the electric arc furnace 3. The air outlet of the blower 7 is connected to an air outlet pipe 18. The air outlet of the air outlet pipe 18 is connected to a filter box 10. The fixing plate 15 and the filter... The filter box 10 is fixedly connected. The air outlet of the filter box 10 is connected to the circulation pipe 16. The air outlet of the circulation pipe 16 is connected to the electric arc furnace 3. The gas supply pipe 17, the air outlet pipe 18 and the outer surface of the circulation pipe 16 are fixedly connected to the heating pipe 6. The heating pipe 6 is made of heat-conducting material and is hollow inside. The air outlet of the heating pipe 6 is connected to the heating pipe 8. The water outlet of the heating pipe 6 is connected to the water outlet pipe 12. Valves are fixedly connected inside the water outlet pipe 12 and the heating pipe 8. L-shaped support columns 1 are fixedly connected to both sides of the bottom end of the electric arc furnace 3.

[0030] During operation, clean water is added to the heating tube 6 through the water outlet pipe 12. The controller controls the opening of the electric valve of the gas supply pipe 17 and starts the blower 7. Hot air is extracted from the electric arc furnace 3 through the gas supply pipe 17 and transported to the filter box 10 for filtration through the gas outlet pipe 18. The hot air is then returned to the electric arc furnace 3 through the circulation pipe 16, achieving the first level of waste heat recovery and utilization in the electric arc furnace 3. During the transportation of hot air through the gas supply pipe 17, the gas outlet pipe 18, and the circulation pipe 16, some heat is lost. Since the heating tube 6 is made of thermally conductive material, this lost heat can heat the clean water inside the heating tube 6. By controlling the valve of the water outlet pipe 12, hot water can be provided for workers to drink. The hot air generated by the heated water is connected to the heating pipe through the heating pipe 8 to provide heating for the workplace. This achieves the second level of waste heat recovery and utilization during the waste heat transmission process. Through multi-level utilization of waste heat, the waste of waste heat in the electric arc furnace 3 can be avoided.

[0031] Example 2

[0032] Please see Figures 1 to 6This utility model provides a technical solution: a waste heat recovery and recycling device for electric arc furnace exhaust gas. A motor 11 is fixedly connected to the top of one side of the filter box 10. One side of the output shaft of the motor 11 passes through the filter box 10 and is fixedly connected to a screw 19. The screw 19 is rotatably connected to the filter box 10. A screw block 20 is threadedly connected to the surface of the screw 19. A scraper 22 is fixedly connected to the bottom of the screw block 20. A filter screen 21 is fixedly connected to the middle of the filter box 10. The scraper 22 is in contact with the filter screen 21. A collection box 13 is slidably connected to the bottom of the filter box 10. One end of the collection box 13 passes through the filter box 10 and is fixedly connected to a pull ring 14. A controller is fixedly connected to the bottom of the other side of the filter box 10. An electric valve, a blower 7, and the motor 11 are electrically connected to the controller through wires.

[0033] In use, the blower 7, air supply pipe 17, and air outlet pipe 18 work together to deliver hot air containing small particles into the filter box 10. The hot air containing small particles is filtered by the filter screen 21. If too many fine particles are attached to the surface of the filter screen 21, the controller starts the motor 11. The output shaft of the motor 11 drives the screw 19 to rotate. Since the screw 19 and the screw block 20 are threadedly connected, the screw block 20 can move left and right, which can drive the scraper 22 to move left and right on the surface of the filter screen 21. The scraper 22 scrapes away the fine particles on the surface of the filter screen 21, preventing the fine particles on the surface of the filter screen 21 from affecting the filtration of particles in the hot air. Due to the gravity of the fine particles, they fall into the collection box 13. The staff can periodically remove the collection box 13 by pulling the ring 14 to clean the collection box 13.

[0034] 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. An electric arc furnace waste heat recovery and recycling device, comprising a main electric arc furnace (3) and a filter box (10), characterized in that: One side top of electric arc furnace (3) is fixedly connected with fixed plate (15), top middle part of fixed plate (15) is fixedly connected with air blower (7), air inlet of air blower (7) is connected with gas pipe (17), inside of gas pipe (17) is fixedly connected with electric valve, air inlet of gas pipe (17) penetrates electric arc furnace (3), air outlet of air blower (7) is connected with gas outlet pipe (18); The outer surface of the gas pipe (17), the gas outlet pipe (18) and the circulating pipe (16) are fixedly connected with the heating pipe (6), and the inside of the heating pipe (6) is hollow; The air outlet of the heating pipe (6) is connected with the heating pipe (8), the water outlet of the heating pipe (6) is connected with the water outlet pipe (12), and the inside of the water outlet pipe (12) and the heating pipe (8) is fixedly connected with the valve; The bottom of the electric arc furnace (3) is fixedly connected with the L-shaped support column (1) on both sides; One side top of filter box (10) is fixedly connected with motor (11), one side of output shaft of motor (11) penetrates filter box (10) and is fixedly connected with screw rod (19), screw rod (19) is rotatably connected with filter box (10); The surface of the screw rod (19) is threadedly connected with the screw block (20), the bottom of the screw block (20) is fixedly connected with the scraper (22), the inside of the filter box (10) is fixedly connected with the filter screen (21), and the scraper (22) is in contact with the filter screen (21).

2. The electric arc furnace off-gas waste heat recovery and recycling device according to claim 1, characterized in that: The air outlet of the gas outlet pipe (18) is connected with the filter box (10), the fixed plate (15) is fixedly connected with the filter box (10), the air outlet of the filter box (10) is connected with the circulating pipe (16), and the air outlet of the circulating pipe (16) is connected with the electric arc furnace (3).

3. The electric arc furnace off-gas waste heat recovery and recycling device according to claim 2, characterized in that: The inside bottom of the filter box (10) is slidably connected with the collecting box (13), one end of the collecting box (13) penetrates the filter box (10) and is fixedly connected with the pull ring (14), and the other side bottom of the filter box (10) is fixedly connected with the controller.

Images