Flue gas gathering device for electric arc furnace steelmaking

Abstract

The utility model provides a flue gas collecting device for steelmaking of an electric arc furnace, which belongs to the technical field of steelmaking equipment and comprises a fixed cover, a side dust suction port, a dust collecting pipe, a dust collecting pipe and a dust collecting pipe, and the side dust suction port is arranged at the top of one side of the fixed cover body; the movable cover is connected with the other side of the fixed cover body through a sealing structure, the movable cover comprises a movable cover body, a top dust suction opening formed in the top of the movable cover body and a movable driving device arranged at the bottom end of the movable cover, and the movable driving device drives the movable cover to reciprocate relative to the fixed cover. The smoke trapping device for electric arc furnace steelmaking can trap smoke generated in different working stages of electric arc furnace steelmaking, and has the advantages of improving smoke trapping efficiency and reducing energy consumption.

Description

Technical Field

[0001] The utility model belongs to the technical field of steelmaking equipment, and particularly relates to a flue gas capture device for electric arc furnace steelmaking. Background Art

[0002] Electric arc furnace steelmaking is a steelmaking method that uses the thermal effect of an electric arc to heat furnace charge for smelting. The soot generated during the electric arc furnace steelmaking process mainly comes from the physical and chemical reactions at high temperatures in the furnace, as well as the processing and handling of raw materials. These soot contain metal oxides and other particulate matters, which have certain health impacts on the environment and operators. Therefore, corresponding environmental protection measures need to be taken during the electric arc furnace steelmaking process to reduce soot emissions and protect the health of operators.

[0003] Currently, for the soot generated during the processes of charging, melting, oxygen blowing, reduction, heat preservation, and tapping in electric arc furnace steelmaking, the traditional solutions are as follows: Install a rotary hood at the top of the electric arc furnace for soot capture. This type of soot capture method is only suitable for small-tonnage electric arc furnaces and can only solve the soot capture during the melting, oxygen blowing, reduction, and heat preservation stages, and cannot capture soot during the charging and tapping stages; Install a rotating hood at the top of the workshop for soot capture. Since most of the soot diffuses to the roof in this type of soot capture method, the capture area is enlarged, a large amount of air volume is required, the energy consumption is high, and the collection rate is low.

[0004] Therefore, there is an urgent need to provide a new type of flue gas capture device for electric arc furnace steelmaking. Summary of the Utility Model

[0005] Details of one or more embodiments of the present utility model are set forth in the following drawings and description to make other features, objects, and advantages of the present application more concise and understandable.

[0006] The present utility model provides a flue gas capture device for electric arc furnace steelmaking, which solves the technical problems of high energy consumption and low capture rate of the existing soot capture device for electric arc furnace steelmaking, and can capture the soot generated during different working stages of electric arc furnace steelmaking, having the characteristics of improving the soot capture rate, reducing soot emissions, and reducing energy consumption.

[0007] On the one hand, the present utility model discloses a flue gas capture device for electric arc furnace steelmaking, including a fixed hood, which includes a fixed hood body and a side dust suction port arranged at the top of one side of the fixed hood body; a moving hood, which is connected to the other side of the fixed hood body through a sealing structure. The moving hood includes a moving hood body, a top dust suction port arranged at the top of the moving hood body, and a moving driving device arranged at the bottom end of the moving hood. Among them, the moving driving device drives the moving hood to reciprocate relative to the fixed hood.

[0008] In some of these embodiments, the movable hood includes a first movable hood and a second movable hood. Both sides of the first movable hood are connected to the fixed hood and the second movable hood respectively through a sealing structure.

[0009] In some of these embodiments, the first movable hood includes a first movable hood body; a first moving drive device, arranged at the bottom end of the first movable hood body, and the first moving drive device drives the first movable hood to reciprocate relative to the fixed hood; a first top dust suction port, arranged at the top of the first movable hood body, near the charging area of the electric arc furnace; a second top dust suction port, arranged at the top of the first movable hood body, near the tapping and steelmaking area of the electric arc furnace; a telescopic air duct, arranged at the top of the first movable hood body, and the air outlets of the first top dust suction port and the second top dust suction port are combined and then connected to the telescopic air duct.

[0010] In some of these embodiments, the telescopic air duct includes a first duct and a second duct. The second duct is sleeved outside the first duct, and the first duct can move relative to the second duct.

[0011] In some of these embodiments, the connection transition between the first duct and the second duct is achieved by an internal rolling shaft and bearings.

[0012] In some of these embodiments, the free end of the first duct is connected to the dust removal duct through a first slewing support, and the free end of the second duct is connected to the first movable hood through a second slewing support.

[0013] In some of these embodiments, the second movable hood includes a second movable hood body; a second moving drive device, arranged at the bottom end of the second movable hood body, and the second moving drive device drives the second movable hood to reciprocate relative to the fixed hood.

[0014] In some of these embodiments, the movable hood and the fixed hood are connected through a staggered-tooth type labyrinth seal structure.

[0015] In some of these embodiments, regulating valves are arranged on both the side dust suction port and the top dust suction port, and the regulating valves are used to adjust the air volume.

[0016] In some of these embodiments, aluminosilicate rock wool fixed by perforated plates is arranged inside the hood bodies of both the fixed hood and the movable hood.

[0017] Compared with the prior art, the beneficial effects of the present utility model are as follows: The flue gas capture device for electric arc furnace steelmaking of the present utility model has the characteristics of improving the dust capture rate and reducing energy consumption. The fixed hood is provided with side suction dust inlets, which can be infinitely close to the dust generated during the melting, oxygen blowing, reduction, and heat preservation of the electric furnace, and can overall reduce the air extraction volume during this working process; the moving hood is provided with top suction dust inlets, which can be infinitely close to the dust in different areas during charging and tapping of molten steel, and can overall reduce the air extraction volume during this working process; by providing suction dust inlets on the fixed hood and the moving hood, the dust generated in different working stages of electric arc furnace steelmaking can be captured; the moving hood and the fixed hood are connected through a sealing structure to prevent dust from overflowing from the joints during steelmaking, reducing environmental pollution; the first moving hood is provided with a telescopic air duct, which can still ensure uninterrupted dust suction function when the first moving hood moves. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings described herein are used to provide a further understanding of the present utility model and constitute a part of the present utility model. The schematic embodiments of the present utility model and their descriptions are used to explain the present utility model and do not constitute an improper limitation to the present utility model.

[0019] Figure 1 FIG. is a schematic structural diagram of the flue gas capture device for electric arc furnace steelmaking provided by an embodiment of the present utility model;

[0020] Figure 2 FIG. is a top view of the flue gas capture device for electric arc furnace steelmaking provided by an embodiment of the present utility model;

[0021] Figure 3 FIG. is a schematic structural diagram of the telescopic air duct in the contracted state of the flue gas capture device for electric arc furnace steelmaking provided by an embodiment of the present utility model;

[0022] Figure 4 FIG. is a schematic structural diagram of the telescopic air duct in the extended state of the flue gas capture device for electric arc furnace steelmaking provided by an embodiment of the present utility model;

[0023] Figure 5 FIG. is a schematic structural diagram of the charging working state of the flue gas capture device for electric arc furnace steelmaking provided by an embodiment of the present utility model;

[0024] Figure 6 FIG. is a top view of the charging working state of the flue gas capture device for electric arc furnace steelmaking provided by an embodiment of the present utility model;

[0025] Figure 7 FIG. is a schematic structural diagram of the tapping working state of the flue gas capture device for electric arc furnace steelmaking provided by an embodiment of the present utility model;

[0026] In the attached drawings: 1. Fixed hood, 110. Fixed hood body, 120. Side dust suction port, 130. First regulating valve; 2. First moving hood, 210. First moving hood body, 220. Top dust suction port, 221. First top dust suction port, 222. Second top dust suction port, 231. Second regulating valve, 232. Third regulating valve, 240. Telescopic air duct, 241. First pipe, 242. Second pipe, 243. Rolling shaft, 244. Bearing, 245. First slewing bearing, 246. Second slewing bearing, 250. First moving drive device; 3. Second moving hood, 310. Second moving hood body, 320. Second moving drive device; 4. Dust removal pipe, 5. Electric arc furnace. Detailed implementation mode

[0027] In order to make the objectives, technical solutions and advantages of the present utility model clearer and more understandable, the present utility model will be described and explained below in conjunction with the attached drawings and embodiments.

[0028] The "one", "a", "an", "the" and other similar words involved in the present utility model do not indicate a quantity limit and may indicate a singular or plural number. The terms "comprising", "including", "having" and any variations thereof involved in the present utility model are intended to cover non-exclusive inclusion. The "connection", "connected" and other similar words involved in the present utility model are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The "multiple" involved in the present utility model refers to two or more. The terms "first", "second", "third", etc. involved in the present utility model are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features.

[0029] An embodiment of the present utility model provides a flue gas capture device for electric arc furnace steelmaking. Figure 1 It is a structural schematic diagram of a flue gas capture device for electric arc furnace steelmaking according to an embodiment of the present utility model. Refer to Figure 1 and Figure 2 As shown, the device at least includes: a fixed hood 1, including a fixed hood body 110 and a side dust suction port 120 provided at the top of one side of the fixed hood body 110; a moving hood, which is connected to the other side of the fixed hood body 110 through a sealing structure. The moving hood includes a moving hood body, a top dust suction port provided at the top of the moving hood body, and a moving drive device provided at the bottom end of the moving hood. Among them, the moving drive device drives the moving hood to reciprocate relative to the fixed hood. By cooperating the fixed hood and the moving hood, the soot generated in different working stages such as melting, oxygen blowing, reduction, and heat preservation of the electric arc furnace is absorbed, the air extraction volume during the working process is reduced, energy is effectively saved, the capture rate is increased to more than 97%, and zero soot leakage can be achieved under unavoidable interference, and the operating energy consumption is reduced by more than 15%.

[0030] The side dust suction port 120 of the fixed hood 1 of the flue gas capture device for electric arc furnace steelmaking of the present utility model can be infinitely close to the soot generated during the melting, oxygen blowing, reduction, and heat preservation of the electric arc furnace, and can overall reduce the air extraction volume during this working process by 3%; a first regulating valve 130 is provided at the side dust suction port 120, and the air volume of the side dust suction port 120 can be automatically adjusted through the first regulating valve 130. In a preferred embodiment, the first regulating valve 130 is an adjustable electric butterfly valve. The electric butterfly valve has an automatic adjustment function. According to different working states of the electric arc furnace, the opening and closing angle of the electric butterfly valve is interlocked with the working state of the electric arc furnace. The size of the opening and closing angle determines the air extraction volume at this time, and the air extraction volume determines the negative pressure in the pipeline. At this time, the operating frequency of the main fan is automatically adjusted through the electronic control constant air pressure control system to achieve the purpose of energy saving. This frequency conversion control method can achieve comprehensive energy saving.

[0031] The number of moving hoods of the flue gas capture device for electric arc furnace steelmaking of the present utility model can be set according to actual production needs. In a preferred embodiment, the moving hood includes a first moving hood 2 and a second moving hood 3. Both sides of the first moving hood 2 are connected to the fixed hood 1 and the second moving hood 3 respectively through a sealing structure. Preferably, the sealing structure is a labyrinth seal; more preferably, the labyrinth seal is a staggered tooth type labyrinth seal structure, which ensures that adjacent hoods can be tightly connected and sealed, preventing soot from overflowing from the joints during steelmaking, and can overall reduce the air extraction volume during the working process. The first moving hood 2 includes a first moving hood body 210; a first moving driving device 250, which is arranged at the bottom end of the first moving hood 2, and the first moving driving device 250 drives the first moving hood 2 to reciprocate relative to the fixed hood 1; a first top dust suction port 221, which is arranged at the top of the first moving hood body 210 and is close to the charging area of the electric arc furnace; a second top dust suction port 222, which is arranged at the top of the first moving hood body 210 and is close to the tapping area of the electric arc furnace; a telescopic air duct 240, which is arranged at the top of the first moving hood body 210. The air outlets of the first top dust suction port 221 and the second top dust suction port 222 are combined and then connected to the telescopic air duct 240. The top dust suction ports arranged at the top of the first moving hood 2 adopt the top suction and downstream flow method to improve the dust suction efficiency; by arranging multiple top dust suction ports, the top dust suction ports can be infinitely close to the dust generation points at different working stages of the electric arc furnace, and the air extraction volume during this working process can be overall reduced. A second regulating valve 231 is provided at the first top dust suction port 221, and the air volume of the first top dust suction port 221 is automatically adjusted through the second regulating valve 231. The first top dust suction port 221 absorbs the soot generated during charging; a third regulating valve 232 is provided at the second top dust suction port 222, and the air volume of the second top dust suction port 222 is automatically adjusted through the third regulating valve 232. The second top dust suction port 222 absorbs the soot generated during tapping. Preferably, both the second regulating valve 231 and the third regulating valve 232 are adjustable electric butterfly valves.

[0032] Reference Figure 3 andFigure 4 As shown in the figure, the telescopic air duct 240 of the flue gas capture device for electric arc furnace steelmaking of the present utility model is formed by sleeving pipes with different diameters, including a first pipe 241 and a second pipe 242. The second pipe 242 is sleeved outside the first pipe 241, and the first pipe 241 can move relative to the second pipe 242. An internal rolling shaft 243 and a bearing 244 are used for connection and transition between the first pipe 241 and the second pipe 242 to ensure smooth operation and good sealing performance of the telescopic air duct and reduce resistance. The free port of the first pipe 242 is connected to the dust removal pipe 4 through a first slewing support 245, and the free port of the second pipe 242 is connected to the first moving hood 2 through a second slewing support 246. Among them, the outlets of the first top dust suction port 221 and the second top dust suction port 222 are combined and connected to the air inlet of the first pipe 241 of the telescopic air duct 240 through the second slewing support 246. The telescopic movement of the telescopic air duct 240 changes with the linear movement of the position of the first moving hood 2. When the first moving hood 2 moves, the telescopic air duct 240 connected to the top dust suction port can continuously absorb smoke and dust. A first moving drive device 250 is arranged at the bottom end of the first moving hood 2, and the first moving drive device 250 drives the first moving hood 2 to move relatively in a direction close to or away from the fixed hood 1.

[0033] The second moving hood 3 of the flue gas capture device for electric arc furnace steelmaking of the present utility model includes a second moving hood body 310 and a second moving drive device 320 arranged at the bottom end of the second moving hood body 310. The second moving hood 3 reciprocally moves along the track relative to the fixed hood 1 under the drive of the second moving drive device 320, playing a guiding role in smoke and dust capture, improving the collection of smoke and dust during charging and tapping; it can also play a shielding role for the smoke and dust in the molten steel tapping area to avoid the influence of wild wind, and can overall reduce the air extraction volume during this working process.

[0034] The hood bodies of the fixed hood and the moving hood of the flue gas capture device for electric arc furnace steelmaking of the present utility model are both made of national standard profiles and steel plates; aluminosilicate rock wool is arranged inside the hood bodies of the fixed hood and the moving hood and fixed through perforated plates, preferably fixed with 75% perforated plates, to achieve the purposes of radiation protection, heat preservation, and noise reduction, and ensure the personal health of on-site operators.

[0035] Reference Figures 5-7As shown in the figure, the flue gas capture device for electric arc furnace steelmaking in the embodiment of the present utility model works as follows: During charging, the first moving hood 2 is separated from the fixed hood 1 to facilitate the overhead crane to lift scrap steel to the top of the electric arc furnace for charging. The second electric butterfly valve at the first top dust suction port 221 near the charging area on the first moving hood 2 is opened, and the rest of the electric butterfly valves are kept closed; During melting, oxygen blowing, reduction, and heat preservation, adjacent hoods are tightly connected through a labyrinth seal structure, and all electric butterfly valves on the fixed hood 1 and the moving hood are opened for dust suction; During tapping, the fixed hood 1 and the first moving hood 2 remain in a combined connection state. The second moving hood 3 on the other side of the first moving hood 2 is driven away from the first moving hood by the second moving drive device 320 to vacate the position for the overhead crane to lift the ladle to receive molten steel. The electric butterfly valves at the first top dust suction port 221 and the second top dust suction port 222 of the first moving hood 2 are both opened for dust suction.

[0036] The above embodiments only represent several implementation manners of the present utility model. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present utility model, several deformations and improvements can still be made, and these all belong to the protection scope of the present utility model.

Claims

1. A fume capture device for electric arc furnace steelmaking, characterized in that: include A fixed cover, comprising a fixed cover body and a side dust suction port arranged at the top of one side of the fixed cover body; The movable hood is connected to the other side of the fixed hood body through a sealing structure. The movable hood includes a movable hood body, a top dust suction port arranged at the top of the movable hood body, and a movable driving device arranged at the bottom of the movable hood, wherein the movable driving device drives the movable hood to reciprocate relative to the fixed hood.

2. The fume capture device for electric arc furnace steelmaking according to claim 1, characterized in that: The movable cover comprises a first movable cover and a second movable cover, and two sides of the first movable cover are respectively connected with the fixed cover and the second movable cover through a sealing structure.

3. The fume capture device for electric arc furnace steelmaking according to claim 2, characterized in that: The first movable cover includes A first movable cover body; A first moving drive device is arranged at the bottom end of the first moving cover body, and the first moving drive device drives the first moving cover to reciprocate relative to the fixed cover; A first top dust suction port is arranged at the top of the first movable cover body, close to the arc furnace charging area; A second top dust suction port is arranged at the top of the first movable cover body, close to the molten steel tapping area of ​​the electric arc furnace; The telescopic air duct is arranged on the top of the first movable cover body, and the air outlet of the first top dust suction port and the air outlet of the second top dust suction port are combined and arranged and then connected to the telescopic air duct.

4. The fume capture device for electric arc furnace steelmaking according to claim 3 is characterized in that: The telescopic air duct comprises a first pipe and a second pipe, the second pipe is sleeved on the outside of the first pipe, and the first pipe can move relative to the second pipe.

5. The fume capture device for electric arc furnace steelmaking according to claim 4, characterized in that: The first pipeline and the second pipeline are connected and transitioned by using built-in rolling shafts and bearings.

6. The fume capture device for electric arc furnace steelmaking according to claim 4, characterized in that: The free port of the first pipeline is connected to the dust removal pipeline through a first slewing support, and the free port of the second pipeline is connected to the first movable cover through a second slewing support.

7. The fume capture device for electric arc furnace steelmaking according to claim 2, characterized in that: The second movable cover comprises A second movable cover body; The second movable driving device is arranged at the bottom end of the second movable cover body, and the second movable driving device drives the second movable cover to move back and forth relative to the fixed cover.

8. The fume capture device for electric arc furnace steelmaking according to claim 1, characterized in that: The movable cover is connected with the fixed cover through a staggered tooth type labyrinth seal structure.

9. The fume capture device for electric arc furnace steelmaking according to claim 1, characterized in that: Both the side dust suction port and the top dust suction port are provided with regulating valves, which are used to adjust the air volume.

10. The fume capture device for electric arc furnace steelmaking according to claim 1, characterized in that: Aluminum silicate rock wool fixed by perforated plates is arranged inside the cover bodies of the fixed cover and the movable cover.

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