A rotatable dust collector for an electrolytic furnace

Abstract

The utility model discloses a rotatable dust collecting device of electrolytic furnace, including dust cover, ventilation pipe and rotatable flange, the dust cover cover is located electrolytic furnace mouth above, and its top has set up the movable door of openable and closable, ventilation pipe includes the fixed ventilation pipe and movable ventilation pipe of coaxial connection, the fixed ventilation pipe is connected with dust cover fixedly, rotatable flange is connected in the middle part of ventilation pipe, and is composed of first flange plate, second flange plate, third flange plate and the thrust bearing of clamping between flange plate, the static ring of thrust bearing is welded with fixed ventilation pipe, and the dynamic ring is welded with movable ventilation pipe, the lower edge of dust cover and the mouth distance is 5-10cm, and through exerting horizontal thrust drive rotatable part ventilation pipe drives dust cover rotation around the axle. The utility model effectively solved the problem of low gas collection efficiency of traditional dust cover, and the operation of charging pouring is inconvenient, realized seamless switching of smoke dust efficient trapping and mouth quick open and close.

Description

Technical Field

[0001] This utility model relates to the field of metallurgical environmental protection equipment technology, specifically a rotatable dust collection device for an electrolytic furnace. Background Technology

[0002] During the molten salt electrolysis process for metal production, high-temperature furnaces (800–1000°C) continuously emit fumes containing fluorides and heavy metals. Existing side-suction dust hoods, due to their excessive installation height (>50cm), result in a gas collection efficiency of less than 40%, and the heat radiation poses a health hazard to operators. National environmental protection standards (GB 16297) strictly control fugitive emissions, necessitating a dust collection device that can be positioned close to the furnace opening and facilitates material feeding. Utility Model Content

[0003] The purpose of this invention is to provide a rotatable dust collection device for an electrolytic furnace, which solves the contradiction between smoke and dust dispersion and operational interference by reducing the height of the dust collection hood and improving its horizontal displacement function.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a rotatable dust collection device for an electrolytic furnace, comprising a dust collection hood, a ventilation pipe and a rotatable flange, wherein the dust collection hood is disposed above the furnace opening of the electrolytic furnace and has an openable and closable movable door on its top. The ventilation duct includes a fixed ventilation duct and a movable ventilation duct connected coaxially, and the fixed ventilation duct is fixedly connected to the dust collector hood. The rotatable flange is connected to the middle of the ventilation pipe and consists of a first flange, a second flange, a third flange, and a thrust bearing sandwiched between the flanges; the stationary ring of the thrust bearing is welded to the fixed ventilation pipe, and the moving ring is welded to the movable ventilation pipe. An air valve is installed on the ventilation duct; The dust removal hood is driven by a rotatable flange to rotate the movable ventilation pipe horizontally, thereby achieving translation relative to the furnace opening.

[0005] Preferably, the thrust bearings are arranged in a stacked configuration, with their moving rings welded together to form a linkage structure; the movable ventilation pipe passes through the two thrust bearings and is welded to the moving rings, while maintaining a rotational clearance between it and the stationary ring.

[0006] Preferably, the first flange and the third flange are fastened together by bolts to form a detachable bearing enclosure structure; the second flange is bolted to the first flange and is used to support the thrust bearing and the movable ventilation pipe.

[0007] Preferably, the diameter of the movable ventilation pipe is 20mm smaller than that of the fixed ventilation pipe, and the two are coaxially connected by a sleeve connection.

[0008] Preferably, the distance between the lower edge of the dust removal hood and the opening of the electrolytic furnace is 5–10 cm.

[0009] The working process of this utility model is as follows: During normal operation of the molten salt electrolysis furnace (furnace temperature 950±50℃), the operator closes the movable door at the top of the dust collector hood, maintaining a gas collection distance of 5-10cm between the lower edge of the hood and the furnace opening. At this time, the fluorine-containing dust generated during electrolysis (flow velocity 1.2m / s) flows sequentially through the dust collector hood cavity, the fixed ventilation pipe (Φ300mm) welded to the hood, and the movable ventilation pipe (Φ280mm, with gaps filled with high-temperature resistant graphite sealing rings) fitted inside, under the negative pressure of the external induced draft fan. Finally, it enters the purification system through the pipeline controlled by the air valve, achieving a dust removal efficiency of 96.2%. When necessary... During material feeding or metal casting, the operator opens the movable door to add raw materials, or directly applies a horizontal thrust of ≤50 N·m to the side wall of the dust collector hood. This force is transmitted through the moving ring of the thrust bearing welded to the movable ventilation pipe, driving the dust collector hood and the movable ventilation pipe to rotate 60°-90° around the flange axis, so that the furnace opening is fully exposed. At this time, relative rolling occurs between the stationary ring (welded to the fixed ventilation pipe) and the moving ring of the stacked thrust bearing. The bearing seat bears the radial load through the flange bolt group. After the displacement is completed, the operator can safely carry out the casting operation. After the operation is completed, the reverse rotation resets the dust collection function.

[0010] The beneficial effects of this utility model are as follows: (1) This utility model forms a high negative pressure gas collection area by precisely controlling the lower edge of the dust collector hood to a very close distance of 5-10cm from the furnace opening, so that the initial collection efficiency of fluorine-containing dust reaches 96.2% (compared to only 40% for traditional side-suction hoods). The hood is made of 310S heat-resistant stainless steel and has a closed operating door, which reduces the heat radiation intensity at the furnace opening from 2000W / m² to below 500W / m², and reduces the facial temperature of operators by more than 60°C; at the same time, the concentration of fluoride in the dust is reduced from 15mg / m³ to 0.8mg / m³, which is far below the limit of GB 16297 (5mg / m³), thus completely solving the occupational health hazards and environmental violation risks.

[0011] (2) The unique rotating mechanism in this utility model uses a two-stage thrust bearing linkage design (the moving ring is welded to the Φ280mm movable ventilation pipe), which only requires a single person to apply horizontal thrust to drive the dust hood to rotate smoothly 60°-90°. During the rotation, the sleeve ventilation pipe maintains 90% airtightness under the protection of the graphite sealing ring, while the rolling friction coefficient between the stacked bearing stationary ring (fixed to the Φ300mm ventilation pipe) and the moving ring is low, so that the entire process of removing the hood from the furnace opening takes less than 10 seconds. After the pouring is completed, the reverse rotation automatically resets the hood. Compared with the traditional disassembly and reassembly of the dust hood (which takes an average of 30 minutes), the work efficiency is improved, and the risk of handling high-temperature components is completely avoided.

[0012] (3) In this utility model, the rotatable flange adopts modular bolt assembly (12 sets of M16 bolts connect the first flange 501 and the third flange 503), and the welding gap design between the thrust bearing and the ventilation pipe (retaining thermal expansion margin) reduces the bearing replacement time from 8 hours to 2 hours. After 10,000 continuous rotations, the bearing wear is <0.1mm, the maintenance cost is reduced by 70%, and there is no need to interrupt electrolytic production. Attached Figure Description

[0013] Figure 1 This is a front view of the device of this utility model (illustrating the state of the dust removal hood covering the furnace opening). Figure 2 This is a side view of the present invention (illustrating the connection between the ventilation duct and the flange). Figure 3 This is a schematic diagram of the opening of the movable door in this utility model. Figure 4 This is a cross-sectional view of the rotatable flange (bearing stack structure) in this utility model. Wherein: 1—Dust hood, 2—Movable door, 3—Air valve, 4—Ventilation pipe, 401—Fixed ventilation pipe, 402—Movable ventilation pipe, 5—Rotating flange, 501—Flange, 502—Flange, 503—Flange, 6—Thrust bearing, 601—Bearing housing, 602—Stationary ring, 603—Moving ring, 7—Furnace opening, 8—Electrode. Detailed Implementation

[0014] The present invention will now be described in further detail with reference to the accompanying drawings.

[0015] like Figure 1-4 The rotating dust collection device for an electrolytic furnace shown includes a dust hood 1, a ventilation pipe 4, and a rotatable flange 5. The dust hood 1 is positioned above the furnace opening 7 of the electrolytic furnace, with a distance of 5–10 cm between the lower edge of the dust hood 1 and the furnace opening 7. The top of the dust hood 1 has an openable and closable door 2. The ventilation pipe 4 includes a fixed ventilation pipe 401 and a movable ventilation pipe 402 coaxially connected. The diameter of the movable ventilation pipe 402 is 20 mm smaller than that of the fixed ventilation pipe 401. The two are coaxially connected by a sleeve. The fixed ventilation pipe 401 is fixedly connected to the dust hood 1. The rotatable flange 5 is connected to the middle of the ventilation pipe 4 and consists of a first flange 501, a second flange 502, a third flange 503, and a thrust bearing 6 sandwiched between the flanges. The stationary ring 602 of the thrust bearing 6 is welded to the fixed ventilation pipe 401, and the moving ring 603 is welded to the movable ventilation pipe 402. An air valve 3 is installed on the ventilation pipe 4.

[0016] The dust collector hood 1 is driven by a rotatable flange 5 to rotate the movable ventilation pipe 402 horizontally, achieving translation relative to the furnace opening 7. Two thrust bearings 6 are stacked, with their moving rings 603 welded together to form a linkage structure. The movable ventilation pipe 402 passes through the two thrust bearings 6 and is welded to the moving rings 603, while maintaining a rotational clearance with the stationary ring 602. The first flange 501 and the third flange 503 are fastened with bolts to form a detachable bearing enclosure structure. The second flange 502 is bolted to the first flange 501 and is used to support the thrust bearings 6 and the movable ventilation pipe 402.

[0017] The working process of this utility model is as follows: During normal operation of the molten salt electrolysis furnace (furnace temperature 950±50℃), the operator closes the movable door 2 at the top of the dust collector hood 1, maintaining a gas collection distance of 5-10cm between the lower edge of the hood and the furnace opening 7. At this time, the fluorine-containing dust (flow velocity 1.2m / s) generated by electrolysis flows sequentially through the dust collector hood 1 cavity, the fixed ventilation pipe 401 (Φ300mm) welded to the hood, and the movable ventilation pipe 402 (Φ280mm, with gaps filled with high-temperature resistant graphite sealing rings) sleeved inside it, under the negative pressure of the external induced draft fan. Finally, it enters the purification system through the pipeline controlled by the air valve, achieving a dust removal efficiency of 96.2%. When feeding or metal casting is required... The operator opens the movable door to put in raw materials, or directly applies a horizontal thrust of ≤50 N·m to the side wall of the dust collector hood. This force is transmitted through the moving ring 603 of the thrust bearing 6 welded to the movable ventilation pipe 402, driving the dust collector hood 1 and the movable ventilation pipe 402 to rotate 60°-90° around the flange axis, so that the furnace opening 7 is fully exposed. At this time, relative rolling occurs between the stationary ring 602 (welded to the fixed ventilation pipe 401) and the moving ring 603 of the stacked thrust bearing 6. The bearing seat 601 bears the radial load through the flange bolt group. After the displacement is completed, the operator can safely carry out the pouring operation. After the operation is completed, the reverse rotation resets the dust collection function.

[0018] The above are merely preferred embodiments of this utility model. It should be noted that, for those skilled in the art, based on the technical teachings provided by this utility model and as common knowledge in the mechanical field, other equivalent modifications and improvements can be made, and these should also be considered within the scope of protection of this utility model.

Claims

1. A rotary dust collection device for an electrolytic furnace, characterized in that, It includes a dust hood (1), a ventilation pipe (4) and a rotatable flange (5). The dust hood (1) is installed above the furnace opening (7) of the electrolytic furnace, and its top is provided with an openable and closable movable door (2). The ventilation duct (4) includes a fixed ventilation duct (401) and a movable ventilation duct (402) connected coaxially. The fixed ventilation duct (401) is fixedly connected to the dust collector hood (1). The rotatable flange (5) is connected to the middle of the ventilation pipe (4) and consists of a first flange (501), a second flange (502), a third flange (503) and a thrust bearing (6) sandwiched between the flanges; the stationary ring (602) of the thrust bearing (6) is welded to the fixed ventilation pipe (401), and the moving ring (603) is welded to the movable ventilation pipe (402); The ventilation pipe (4) is equipped with a damper (3); The dust hood (1) is driven by a rotatable flange (5) to rotate the movable ventilation pipe (402) horizontally, thereby achieving translation relative to the furnace opening (7).

2. The rotary dust collection device for an electrolytic furnace according to claim 1, characterized in that: The thrust bearing (6) consists of two stacked bearings, with their moving rings (603) welded together to form a linkage structure; the movable ventilation pipe (402) passes through the two thrust bearings (6) and is welded to the moving rings (603), while maintaining a rotational gap with the stationary ring (602).

3. A rotary dust collection device for an electrolytic furnace according to claim 1 or 2, characterized in that: The first flange (501) and the third flange (503) are fastened by bolts to form a detachable bearing encapsulation structure; the second flange (502) is bolted to the first flange (501) to support the thrust bearing (6) and the movable ventilation pipe (402).

4. The rotary dust collection device for an electrolytic furnace according to claim 3, characterized in that: The diameter of the movable ventilation pipe (402) is 20mm smaller than that of the fixed ventilation pipe (401), and the two are coaxially connected by sleeve connection.

5. A rotary dust collection device for an electrolytic furnace according to claim 4, characterized in that: The distance between the lower edge of the dust hood (1) and the furnace opening (7) of the electrolytic furnace is 5–10 cm.

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