A magnesium reduction plant dust collection system and method

Abstract

The application relates to the technical field of smoke dust collection, and provides a reduction magnesium workshop smoke dust collection system and method, which comprises a reduction furnace, a vacuum main pipeline, a first bag-type dust collector, a dust extraction device and a filtering device, a plurality of reduction tanks are arranged on the reduction furnace, vacuum pipes are arranged on the reduction tanks, the vacuum main pipeline is connected with the first bag-type dust collector, the dust extraction device comprises a horizontal displacement mechanism, a vertical displacement mechanism and a suction mechanism, the suction mechanism comprises a dust extraction fan, a first cover body and a dust extraction pipeline. The existing vacuum pipeline is utilized to close and collect the smoke dust in the reduction tanks, the smoke dust collection efficiency is improved, after the reduction tanks are opened and the reduction tanks are loaded, the first cover body is moved above the tank opening of the reduction tank, the first cover body is ensured to be closest to the smoke dust escape opening, compared with the prior art, the adsorption distance is shortened, the smoke dust collection efficiency is further improved, the energy consumption is reduced, the filtering device is arranged, the smoke dust is filtered, and subsequent treatment is facilitated.

Description

Technical Field

[0001] This application relates to the field of flue gas dust collection technology, and more specifically, to a dust collection system and method for a magnesium reduction workshop. Background Technology

[0002] In the Pidgeon process for producing crude magnesium, dolomite is used as the main raw material. The raw material is calcined in a rotary kiln to produce calcined white magnesia, the main components of which are calcium oxide and magnesium oxide. Ferrosilicon is used as a reducing agent and fluorite as a catalyst. The calcined white magnesia, ferrosilicon, and fluorite powder are metered and batched, ground, and then pressed into pellets. During the process of loading the pellets into the horizontal reduction tank, dust will be emitted. At the end of the single-tank production, after the crystallization tank is removed, the waste pellets after the reaction need to be removed in order to load new pellets. During the slag removal process, smoke and dust will be generated in front of the reduction furnace.

[0003] Currently, the common method for collecting smoke and dust is to use one or more fixed smoke and dust collection hoods. However, the distance between the smoke and dust collection hood and the opening of the reduction tank increases the difficulty of collecting the smoke and dust, requires higher power from the induced draft fan, increases system energy consumption, and wastes resources. Summary of the Invention

[0004] The purpose of this application is to provide a dust collection system and method for magnesium reduction workshops, which performs dust extraction in different scenarios such as before opening the reduction tank, during opening the tank, and when sealing the tank, thereby improving the dust collection effect.

[0005] This application provides a dust collection system and method for a magnesium reduction workshop, adopting the following technical solution:

[0006] A dust collection system for a magnesium reduction workshop includes a reduction furnace, a vacuum main pipeline, a first bag filter, a dust extraction device, and a filtration device. The reduction furnace has several reduction tanks, each equipped with a vacuum tube and a valve. The vacuum tubes are connected to the vacuum main pipeline, and a vacuum sensor is installed between the vacuum tubes and the vacuum main pipeline. The vacuum main pipeline is connected to the first bag filter. The dust extraction device includes a horizontal displacement mechanism, a vertical displacement mechanism, and a suction mechanism. The suction mechanism includes a dust extraction fan, a first hood, and a dust extraction pipeline. The horizontal displacement mechanism drives the vertical displacement mechanism and the filtration device to move synchronously left and right. The vertical displacement mechanism drives the first hood to move up and down. The dust extraction pipeline is located between the first hood and the dust extraction fan, and the dust extraction fan is connected to the filtration device.

[0007] Preferably, the horizontal displacement mechanism includes a support frame, a drive assembly, and a connector. The drive assembly is mounted on the support frame and drives the connector to move left and right. The filter device is mounted on the connector.

[0008] Preferably, the drive assembly includes a servo motor, a threaded rod, and a moving block. The servo motor is mounted on the support frame. One end of the threaded rod is connected to the servo motor, and the other end of the threaded rod is rotatably connected to the support frame. The moving block is threadedly connected to the threaded rod and slidably connected to the support frame. The vertical displacement mechanism is mounted on the moving block.

[0009] Preferably, the vertical displacement mechanism includes a cylinder and a lifting plate. The cylinder is mounted on the moving block and drives the lifting plate. The first cover is fixedly connected to the lifting plate.

[0010] Preferably, the filtration device includes a filter box, filter cartridges, baffles, and a mounting frame. A support rod is provided at the bottom of the filter box, and the support rod is mounted on the connector. A dust extraction fan is installed on the outer wall of the filter box and connected to the filter box via a pipe. The baffles and the mounting frame are both fixedly installed inside the filter box. Multiple filter cartridges are provided, with the top of each cartridge penetrating the baffle and rotatably connected to it. The bottom of each filter cartridge is mounted on the mounting frame and rotatably connected to it. An exhaust pipe is provided at the top of the filter box, and a slag discharge pipe is provided at the bottom of the filter box.

[0011] Preferably, a plurality of ball bearings are provided between the filter cartridge and the baffle, and between the filter cartridge and the mounting frame. The ball bearings are arranged in a ring and are embedded in the baffle and the mounting frame.

[0012] Preferably, the filter box is provided with a cleaning mechanism, which includes a drive motor, a rotating rod and a brush. The drive motor is located at the top of the filter box, one end of the rotating rod is connected to the drive motor, and the other end of the rotating rod passes through the filter box and extends into the interior of the filter box. The brush is located on the rotating rod and contacts the filter cartridge.

[0013] Preferably, a flow guide block is provided at the bottom of the filter box.

[0014] Preferably, a second cover is provided above the reduction furnace, the second cover is connected to a main air duct, and the main air duct is connected to a second bag filter.

[0015] The present invention also provides a method for collecting smoke and dust, comprising:

[0016] S1: Identify the reduction tank that has completed the reaction and send the location information of the reduction tank to the terminal equipment. The terminal equipment issues a command based on the location information of the reduction tank to control the opening of the valve on the vacuum tube corresponding to the reduction tank. The dust collection fan and the first bag dust collector start working and extract the flue gas in the reduction tank through the vacuum tube and the main vacuum pipeline.

[0017] S2: While extracting the flue gas in the reduction tank, the vacuum sensor detects the vacuum level of the vacuum tube. When the vacuum level reading reaches the set value, the dust collection fan, the first bag filter, and the valve are shut down.

[0018] S3: The horizontal displacement mechanism drives the vertical displacement mechanism to move directly above the corresponding reduction tank. The vertical displacement mechanism drives the first cover to move down to the set position and stop, and the dust extraction fan is started.

[0019] S4: Open the reduction tank. Under the action of the dust extraction fan, a negative pressure is generated inside the first hood to capture the smoke and dust at the opening of the reduction tank.

[0020] S5: After the slag removal is completed and the tank is refilled and sealed, the dust extraction fan is turned off and the valve is opened again. The dust collection fan and the first bag filter start working to evacuate the inside of the reduction tank. When the vacuum reading reaches the set value, the dust collection fan, the first bag filter and the valve are turned off.

[0021] The beneficial effects of this invention are:

[0022] This invention utilizes existing vacuum pipes to seal and capture the dust inside the reduction tank before opening, improving the dust capture efficiency. After opening the reduction tank and during loading, the first hood is moved above the tank opening to ensure that the first hood is as close as possible to the dust escape port. Compared with the prior art, this shortens the adsorption distance, further improves the dust capture efficiency, and reduces energy consumption. A filtration device is installed to filter the dust and remove dust impurities, facilitating subsequent flue gas treatment. Attached Figure Description

[0023] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the structure of the present invention;

[0025] Figure 2 This is a side view of the present invention;

[0026] Figure 3This is a schematic diagram of the connection structure between the dust extraction device and the filtration device in this invention;

[0027] Figure 4 This is a schematic diagram of the filtration device in this invention;

[0028] Figure 5 This is a schematic diagram of the filter cartridge in this invention;

[0029] Figure 6 This is a schematic diagram showing the distribution of the balls on the baffle in this invention.

[0030] The reference numerals in the attached figures are as follows:

[0031] 1. Reduction furnace; 2. Vacuum main pipeline; 3. First bag filter; 4. Dust extraction device; 5. Filter device; 6. Reduction tank; 7. Vacuum tube; 8. Valve; 9. Guide block; 10. Vacuum sensor; 11. Horizontal displacement mechanism; 12. Vertical displacement mechanism; 13. Suction mechanism; 14. Dust extraction fan; 15. First enclosure; 16. Dust extraction pipeline; 17. Support frame; 18. Drive assembly; 19. Connecting parts 20. Servo motor; 21. Threaded rod; 22. Moving block; 23. Cylinder; 24. Lifting plate; 25. Filter box; 26. Filter cartridge; 27. Baffle; 28. Mounting bracket; 29. ​​Support rod; 30. Exhaust pipe; 31. Slag discharge pipe; 32. Ball bearing; 33. Cleaning mechanism; 34. Drive motor; 35. Rotating rod; 36. Brush; 37. Second cover; 38. Main air duct; 39. Second bag filter. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0033] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0034] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0035] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this application is in use. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0036] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0037] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0038] like Figure 1-6 As shown in the embodiment of this application, a dust collection system for a magnesium reduction workshop includes a reduction furnace 1, a vacuum main pipeline 2, a first bag filter 3, a dust extraction device 4, and a filter device 5. The reduction furnace 1 is equipped with several reduction tanks 6, each with a vacuum tube 7 and a valve 8. The vacuum tube 7 is connected to the vacuum main pipeline 2, and a vacuum sensor 10 is installed between the vacuum tube 7 and the vacuum main pipeline 2. The vacuum main pipeline 2 is connected to the first bag filter 3, which is connected to a dust collection fan. The dust extraction device 4 includes a horizontal displacement mechanism 11, a vertical displacement mechanism 12, and a suction mechanism 13. The suction mechanism 13 includes a dust extraction fan 14, a first hood 15, and a dust extraction pipe 16. The horizontal displacement mechanism 11 drives the vertical displacement mechanism 12 and the filter device 5 to move synchronously left and right. The vertical displacement mechanism 12 drives the first hood 15 to move up and down. The dust extraction pipe 16 is located between the first hood 15 and the dust extraction fan 14, and the dust extraction fan 14 is connected to the filter device 5.

[0039] Before opening the lid of the reduction tank 6, open the valve 8 on the corresponding vacuum tube 7 of the reduction tank 6. The dust collector and the first bag filter 3 start working, extracting the flue gas from the reduction tank 6 through the vacuum tube 7 and the main vacuum pipe 2. The vacuum sensor 10 detects the vacuum degree of the vacuum tube 7. When the vacuum degree reading reaches the set value, the dust collector fan, the first bag filter 3 and the valve 8 are turned off. At the same time, the horizontal displacement mechanism 11 drives the vertical displacement mechanism 12 to the set position and stops. The vertical displacement mechanism 12 drives the first cover 15 to move down to near the opening of the reduction tank 6. The dust extraction fan 14 is started to generate negative pressure inside the first cover 15. The opening of the reduction tank 6 is opened. Under the action of negative pressure, the dust is forced to enter the first cover 15. The filter device 5 filters the dust and collects the filtered solid impurities. After the slag is removed and the tank is refilled and sealed, the dust extraction fan 14 is turned off.

[0040] In this embodiment, the horizontal displacement mechanism 11 includes a support frame 17, a drive assembly 18, and a connector 19. The drive assembly 18 is mounted on the support frame 17 and drives the connector 19 to move left and right. The filter device 5 is mounted on the connector 19 and the connector 19 supports the filter device 5. The filter device 5 and the connector 19 move synchronously.

[0041] In this embodiment, the drive assembly 18 includes a servo motor 20, a threaded rod 21, and a moving block 22. The servo motor 20 is mounted on the support frame 17. One end of the threaded rod 21 is connected to the servo motor 20, and the other end of the threaded rod 21 is rotatably connected to the support frame 17. The moving block 22 is threadedly connected to the threaded rod 21 and slidably connected to the support frame 17. The vertical displacement mechanism 12 is mounted on the moving block 22.

[0042] During operation, the servo motor 20 is started, and the servo motor 20 drives the threaded rod 21 to rotate in both directions, causing the moving block 22 to slide left and right along the support frame 17, thereby adjusting the relative position of the vertical displacement mechanism 12.

[0043] In this embodiment, the vertical displacement mechanism 12 includes a cylinder 23 and a lifting plate 24. The cylinder 23 is mounted on the moving block 22 and drives the lifting plate 24. The first cover 15 is fixedly connected to the lifting plate 24. When the vertical displacement mechanism 12 stops after running to the set position, the cylinder 23 is started and drives the lifting plate 24 to move down, so that the first cover 15 is close to the mouth of the reduction tank 6, which facilitates the collection of dust at the mouth of the tank.

[0044] In this embodiment, the filtration device 5 includes a filter box 25, filter cartridges 26, baffles 27, and mounting brackets 28. A support rod 29 is provided at the bottom of the filter box 25 and is mounted on a connector 19. A dust extraction fan 14 is mounted on the outer wall of the filter box 25 and is connected to the filter box 25 through a pipe. Both the baffles 27 and the mounting brackets 28 are fixedly installed inside the filter box 25. Multiple filter cartridges 26 are provided, with the top of the filter cartridges 26 penetrating through the baffles 27. The filter cartridges 26 and the baffles 27 are rotatably connected. The bottom of the filter cartridges 26 is mounted on the mounting brackets 28 and is rotatably connected to the mounting brackets 28. An exhaust pipe 30 is provided at the top of the filter box 25, and a slag discharge pipe 31 is provided at the bottom of the filter box 25.

[0045] After the dust extraction fan 14 draws the smoke and dust into the filter box 25, the filter cartridge 26 filters the dust and impurities. The filtered impurities fall into the slag discharge pipe 31, and the filtered gas is discharged through the exhaust pipe 30. Under the action of the airflow, the filter cartridge 26 rotates, which makes it easier to shake off the dust and impurities.

[0046] In this embodiment, a number of balls 32 are provided between the filter cartridge 26 and the baffle 27, and between the filter cartridge 26 and the mounting frame 28. The balls 32 are arranged in a ring and are embedded in the baffle 27 and the mounting frame 28 to facilitate the rotation of the filter cartridge 26.

[0047] In this embodiment, a cleaning mechanism 33 is provided on the filter box 25. The cleaning mechanism 33 includes a drive motor 34, a rotating rod 35, and a brush 36. The drive motor 34 is located on the top of the filter box 25. One end of the rotating rod 35 is connected to the drive motor 34, and the other end of the rotating rod 35 passes through the filter box 25 and extends into the interior of the filter box 25. The brush 36 is located on the rotating rod 35 and contacts the filter cartridge 26.

[0048] When in use, start the drive motor 34, and the rotating rod 35 and the brush 36 will rotate synchronously. The brush 36 acts on the filter cartridge 26, causing the filter cartridge 26 to rotate, which facilitates the shaking off of dust, reduces the cleaning frequency of the filter cartridge 26, and extends the service life of the filter cartridge 26.

[0049] In this embodiment, a guide block 9 is provided at the bottom of the filter box 25 to facilitate the discharge of residue into the slag pipe 31.

[0050] In this embodiment, a second cover 37 is provided above the reduction furnace 1. The second cover 37 is connected to a main air duct 38, the main air duct 38 is connected to a second bag filter 39, and the second bag filter 39 is connected to a dust collection fan, which facilitates the collection of flue gas generated by the reduction furnace 1.

[0051] This embodiment also provides a method for collecting smoke and dust, including the following steps:

[0052] S1: The reduction tank 6 that has completed the reaction is identified and the location information of the reduction tank 6 is sent to the terminal device. The terminal device issues an instruction based on the location information of the reduction tank 6 to control the opening of the valve 8 on the vacuum tube 7 corresponding to the reduction tank 6. The dust collection fan and the first bag dust collector 3 start to work and extract the flue gas in the reduction tank 6 through the vacuum tube 7 and the main vacuum pipeline 2.

[0053] S2: While extracting the flue gas in the reduction tank 6, the vacuum sensor 10 detects the vacuum degree of the vacuum tube 7. When the vacuum degree reading reaches the set value, the dust collection fan, the first bag dust collector 3 and the valve 8 are shut down.

[0054] S3: The horizontal displacement mechanism 11 drives the vertical displacement mechanism 12 to run directly above the corresponding reduction tank 6. The vertical displacement mechanism 12 drives the first cover 15 to move down to the set position and stop, and the dust extraction fan 14 is started.

[0055] S4: Open the reduction tank 6. Under the action of the dust extraction fan 14, a negative pressure is generated inside the first cover 15 to capture the smoke and dust at the opening of the reduction tank 6.

[0056] S5: After the slag removal is completed and the tank is refilled and sealed, the dust extraction fan 14 is turned off and the valve 8 is opened again. The dust collection fan and the first bag filter 3 start working to evacuate the inside of the reduction tank 6. When the vacuum reading reaches the set value, the dust collection fan, the first bag filter 3 and the valve 8 are turned off.

[0057] In step S1, since the dust from the reduction tank 6 after it is opened will first pass through the closed and narrow interior of the reduction tank 6, and then through the exterior of the reduction tank 6 where the space is instantly enlarged, the size of the collection port inside the reduction tank 6 is much smaller than that outside. According to the basic principle of negative pressure dust collection: the larger the dust collection port (such as outside the reduction tank 6), the higher the power requirement of the downstream induced draft fan. Conversely, under the same dust removal induced draft fan configuration, the more sealed the dust collection port (such as inside the reduction tank 6), the lower the difficulty of dust collection. By using the existing vacuum tubes 7, the dust inside the reduction tank 6 can be collected point-to-point, and the suction power can be concentrated and controlled at each point, which can effectively improve the collection efficiency.

[0058] In steps S2-S5, due to the high temperature at the furnace front, according to the flow characteristics of hot and cold air, when the furnace front temperature rises, the hot air rises and the cold air compensates from below, forming a convection zone at the furnace front. Convection is slow during the sealing of reduction tank 6, but during the unloading and loading of reduction tank 6, due to the opening of the tank opening area and the high temperature of crude magnesia, the air temperature rises and convection accelerates. The flue gas not only comes from the fine combustion of crude magnesia corresponding to the tank opening of reduction tank 6 and the dust during slag discharge, but also from the scattered potassium and sodium fragments from the ground and both sides. The combustion of potassium and sodium in the furnace and the burning of the pot lid result in a large transverse flue gas area in front of the furnace. Adopting the principle of on-site collection can improve the collection effect of the flue gas. The dust is mainly formed by the explosion of the reducing slag during slag discharge. Under the fixed suction of the far-end fan, the closer the first hood 15 is to the source of the dust, the more concentrated the dust collection force is. Therefore, the optimal collection point should be close to the opening of the reducing pot 6. According to the usage requirements, the first hood 15 can be moved so that it is closer to the opening of the reducing pot 6, which can effectively improve the dust collection effect.

[0059] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A dust collection system for a magnesium reduction workshop, characterized in that: The system includes a reduction furnace, a main vacuum pipeline, a first bag filter, a dust extraction device, and a filter. The reduction furnace has several reduction tanks, each with a vacuum tube and a valve. The vacuum tubes are connected to the main vacuum pipeline, and a vacuum sensor is installed between them. The main vacuum pipeline is connected to the first bag filter. The dust extraction device includes a horizontal displacement mechanism, a vertical displacement mechanism, and a suction mechanism. The suction mechanism includes a dust extraction fan, a first hood, and a dust extraction pipeline. The horizontal displacement mechanism drives the vertical displacement mechanism and the filter to move synchronously left and right. The vertical displacement mechanism drives the first hood to move up and down. The dust extraction pipeline is located between the first hood and the dust extraction fan, and the dust extraction fan is connected to the filter. The horizontal displacement mechanism includes a support frame, a drive assembly, and a connector. The drive assembly is mounted on the support frame and drives the connector to move left and right. The filter device is mounted on the connector. The filtration device includes a filter box, filter cartridges, baffles, and a mounting frame. A support rod is provided at the bottom of the filter box and is mounted on the connector. A dust extraction fan is installed on the outer wall of the filter box and connected to the filter box via a pipe. The baffles and the mounting frame are both fixedly installed inside the filter box. Multiple filter cartridges are provided, with the top of each cartridge penetrating the baffle and rotatably connected to it. The bottom of each filter cartridge is mounted on the mounting frame and rotatably connected to it. An exhaust pipe is provided at the top of the filter box, and a slag discharge pipe is provided at the bottom of the filter box.

2. The dust collection system for a magnesium reduction workshop according to claim 1, characterized in that: The drive assembly includes a servo motor, a threaded rod, and a moving block. The servo motor is mounted on the support frame. One end of the threaded rod is connected to the servo motor, and the other end of the threaded rod is rotatably connected to the support frame. The moving block is threadedly connected to the threaded rod and slidably connected to the support frame. The vertical displacement mechanism is mounted on the moving block.

3. The dust collection system for a magnesium reduction workshop according to claim 2, characterized in that: The vertical displacement mechanism includes a cylinder and a lifting plate. The cylinder is mounted on the moving block and drives the lifting plate. The first cover is fixedly connected to the lifting plate.

4. The dust collection system for a magnesium reduction workshop according to claim 1, characterized in that: A plurality of ball bearings are provided between the filter cartridge and the baffle, and between the filter cartridge and the mounting frame. The ball bearings are arranged in a ring and are embedded in the baffle and the mounting frame.

5. The dust collection system for a magnesium reduction workshop according to claim 4, characterized in that: The filter box is equipped with a cleaning mechanism, which includes a drive motor, a rotating rod, and a brush. The drive motor is located at the top of the filter box. One end of the rotating rod is connected to the drive motor, and the other end of the rotating rod passes through the filter box and extends into the interior of the filter box. The brush is located on the rotating rod and contacts the filter cartridge.

6. The dust collection system for a magnesium reduction workshop according to claim 1, characterized in that: A flow guide block is provided at the bottom of the filter box.

7. The dust collection system for a magnesium reduction workshop according to claim 1, characterized in that: A second hood is provided above the reduction furnace, and the second hood is connected to a main air duct, which is connected to a second bag filter.

8. A method for collecting dust, comprising using the dust collection system for magnesium reduction workshops as described in any one of claims 1-7, characterized in that: include: S1: Identify the reduction tank that has completed the reaction and send the location information of the reduction tank to the terminal equipment. The terminal equipment issues a command based on the location information of the reduction tank to control the opening of the valve on the vacuum tube corresponding to the reduction tank. The dust collection fan and the first bag dust collector start working and extract the flue gas in the reduction tank through the vacuum tube and the main vacuum pipeline. S2: While extracting the flue gas in the reduction tank, the vacuum sensor detects the vacuum level of the vacuum tube. When the vacuum level reading reaches the set value, the dust collection fan, the first bag filter, and the valve are shut down. S3: The horizontal displacement mechanism drives the vertical displacement mechanism to move directly above the corresponding reduction tank. The vertical displacement mechanism drives the first cover to move down to the set position and stop, and the dust extraction fan is started. S4: Open the reduction tank. Under the action of the dust extraction fan, a negative pressure is generated inside the first hood to capture the smoke and dust at the opening of the reduction tank. S5: After the slag removal is completed and the tank is refilled and sealed, the dust extraction fan is turned off and the valve is opened again. The dust collection fan and the first bag filter start working to evacuate the inside of the reduction tank. When the vacuum reading reaches the set value, the dust collection fan, the first bag filter and the valve are turned off.

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