Dust Suppression and Slag Discharge System for Magnesium Alloy Vertical Retort Furnace

Abstract

The present invention relates to slag discharge of a vertical retort furnace for magnesium alloys, specifically to a dust suppression and slag discharge system for a vertical retort furnace for magnesium alloys, which includes a bent pipe type slag discharge cylinder and a slag transport vehicle with a movable slag receiving cylinder arranged on the upper part. The flange at the upper opening of the slag discharge cylinder of the bent pipe type slag discharge cylinder is connected to the flange of the slag discharge port of the retort. The flange at the lower opening of the slag discharge cylinder of the bent pipe type slag discharge cylinder is connected to a wedge-shaped sealing cover, and the wedge-shaped sealing cover is inclined. Inside the upper opening of the movable slag receiving cylinder, there is a flap with self-adjustable opening degree. The movable slag receiving cylinder on the slag transport vehicle is guided by gears and racks and can move within a certain range. The dust suppression and slag discharge system of the present invention effectively controls the slag discharge speed, and at the same time greatly reduces the amount of air returning to the inside of the tank, thus solving the problem of smoke and fire returning from the furnace top, reducing the emission of dust-containing waste gas, improving the operating environment at the furnace top, and prolonging the service life of the furnace top facilities; the wedge-shaped sealing cover is convenient to open and close and can well maintain the vacuum degree inside the retort.

Description

Technical Field

[0001] The present invention relates to slag discharging of a vertical shaft reduction furnace for magnesium alloy, specifically to a dust suppression and slag discharging system for a vertical shaft reduction furnace of magnesium alloy. Background Art

[0002] At present, the horizontal tank layout is still widely used for magnesium alloy reduction furnaces, which generally have problems such as high labor intensity, poor operating environment, and serious pollution, and are no longer suitable for continued use. In recent years, some enterprises have transformed the horizontal tank reduction furnace into a vertical shaft reduction furnace, achieving preliminary mechanized operation, saving a large amount of manpower, and the pollutant emission situation has also been improved. The structure of the vertical shaft reduction furnace is as Figure 1 shown, including a vertical reduction tank 1. A funnel-shaped slag discharger 7 is arranged at the bottom inside the reduction tank 1. A core pipe 14 is arranged inside the reduction tank 1, and the bottom end of the core pipe 14 is placed inside the funnel-shaped slag discharger 7. The bottom slag discharge port of the reduction tank 1 is connected to a vertical sealing cover 15 through a flange. The material is placed in the space between the reduction tank 1 and the core pipe 14. After the reduction reaction is completed, the vertical sealing cover 15 is opened and the core pipe 14 is lifted, and the waste slag is directly discharged from the slag discharge port. However, there are still problems such as backflow of smoke and fire at the furnace top during slag discharging, which seriously affects the operation at the furnace top, and at the same time causes damage to the furnace top equipment and reduces the service life of the furnace body. The reason is that the reduction tank adopts bottom direct discharge slag discharging. At this time, the discharging speed of the waste slag is not limited, the waste slag in the tank body is in a scattered state, and air flows back into the tank body at high speed from the lower slag discharge port and emerges from the top of the tank body. In addition, the vertical sealing cover 15 at the bottom of the reduction tank 1 needs to be fastened with multiple bolts, it is difficult to ensure the vacuum degree inside the tank body, the opening and closing operation is inconvenient, and it also has a certain impact on slag discharging. Summary of the Invention

[0003] Aiming at the problems of backflow of smoke and fire at the furnace top, inconvenient opening and closing of the bottom vertical sealing cover, and poor sealing retention during direct slag discharging of the vertical shaft reduction furnace, the present invention provides a feasible dust suppression and slag discharging system for a vertical shaft reduction furnace of magnesium alloy.

[0004] The present invention is realized by the following technical solutions: A dust suppression and slag discharging system for a vertical shaft reduction furnace of magnesium alloy, including a bent pipe type slag discharging cylinder. The upper flange of the slag discharging cylinder of the bent pipe type slag discharging cylinder is connected to the slag discharge port flange of the reduction tank, and the lower flange of the slag discharging cylinder of the bent pipe type slag discharging cylinder is connected to a sealing cover. During slag discharging, the bent part of the bent pipe type slag discharging cylinder forms a resistance to the waste slag discharged at high speed and then discharges it from the side discharge port of the bent pipe type slag discharging cylinder, effectively slowing down the slag discharging speed, changing the original dispersed high-speed discharge of the waste slag in the tank body into a controlled full-pipe slow discharge, greatly reducing the amount of air returning to the inside of the tank body during slag discharging, thereby eliminating the phenomenon of backflow of smoke and fire at the furnace top, maximizing the solution to the discharge of furnace top waste gas, and at the same time solving the problems of the influence of hot air flow on furnace top operation and damage to furnace top facilities, and increasing the service life of the furnace body.

[0005] In the above-mentioned dust suppression and slag discharging system for the magnesium alloy vertical tank reduction furnace, the funnel-shaped slag discharger is provided with a downward extension section. The downward extension section of the funnel-shaped slag discharger extends into the elbow-shaped slag discharging cylinder, and a certain cavity is formed between the downward extension section of the funnel-shaped slag discharger and the bending part of the slag discharging cylinder. In the initial stage of slag discharging, the waste slag in the tank can fall rapidly as a whole for a certain distance, which is beneficial to the overall detachment of the waste slag adhering to the tank wall and then discharging it at a uniform speed.

[0006] In the above-mentioned dust suppression and slag discharging system for the magnesium alloy vertical tank reduction furnace, the sealing cover connected to the lower flange of the slag discharging cylinder is a wedge-shaped sealing cover, and the wedge-shaped sealing cover is inclined. The inclined wedge-shaped sealing cover can completely seal the lower opening of the slag discharging cylinder by its own weight.

[0007] In the above-mentioned dust suppression and slag discharging system for the magnesium alloy vertical tank reduction furnace, it further includes a slag transport vehicle with a movable slag receiving cylinder provided on the upper part. The movable slag receiving cylinder is matched with the elbow-shaped slag discharging cylinder. When discharging slag, first open the wedge-shaped sealing cover, and dock the upper opening of the movable slag receiving cylinder with the lower opening of the elbow-shaped slag discharging cylinder to discharge slag.

[0008] In the above-mentioned dust suppression and slag discharging system for the magnesium alloy vertical tank reduction furnace, a flap with adjustable opening degree is installed inside the upper opening of the movable slag receiving cylinder, which can effectively inhibit the waste gas in the slag transport vehicle from returning to the slag discharging cylinder.

[0009] In the above-mentioned dust suppression and slag discharging system for the magnesium alloy vertical tank reduction furnace, racks are arranged on the upper part of the slag transport vehicle, and gears matched with the racks are arranged on the movable slag receiving cylinder. The movable slag receiving cylinder is guided by the gears and racks and can move within a certain range, which is convenient for the opening and closing and sealing between the elbow-shaped slag discharging and the interface of the movable slag receiving cylinder, that is, moving away and merging during alignment.

[0010] The dust suppression and slag discharging system of the present invention effectively controls the slag discharging speed, and at the same time greatly reduces the amount of air returning to the inside of the reduction tank, thus solving the problem of smoke and fire returning from the furnace top. The wedge-shaped sealing cover is convenient to open and close and can well maintain the vacuum degree in the reduction tank. Description of the Drawings

[0011] Figure 1 It is a schematic structural diagram of the reduction tank.

[0012] Figure 2 It is a schematic connection diagram of the elbow-shaped slag discharging cylinder and the reduction tank.

[0013] Figure 3 It is a schematic structural diagram of the slag transport vehicle.

[0014] Figure 4 It is a schematic docking diagram of the movable slag receiving cylinder and the elbow-shaped slag discharging cylinder.

[0015] In the figure: 1 - reduction tank, 2 - slag discharge port flange of reduction tank, 3 - upper flange of slag discharge cylinder, 4 - elbow-shaped slag discharge cylinder, 5 - lower flange of slag discharge cylinder, 6 - wedge-shaped sealing cover, 7 - funnel-shaped slag discharger, 8 - slag transport vehicle, 9 - rack, 10 - gear, 11 - movable slag receiving cylinder, 12 - flap, 13 - flap coupling shaft, 14 - core pipe, 15 - vertical sealing cover. Specific implementation mode

[0016] 1. The direct slag discharge of the reduction tank is changed to side slag discharge. The lower extension section is added to the funnel-shaped slag discharger 7, and it is changed to a lower extension funnel-shaped slag discharger. The upper flange 3 of the slag discharge cylinder of the elbow-shaped slag discharge cylinder 4 is connected to the slag discharge port flange 2 of the reduction tank. The lower extension section of the lower extension funnel-shaped slag discharger extends into the elbow-shaped slag discharge cylinder 4. During slag discharge, the waste slag is discharged from the lower extension section of the lower extension funnel-shaped slag discharger and accumulates at the bending part of the elbow-shaped slag discharge cylinder 4, and then is discharged from the lower port on the side of the elbow-shaped slag discharge cylinder 4. The lower extension section of the lower extension funnel-shaped slag discharger forms a blockage to the discharge of the waste slag at the bending part of the elbow-shaped slag discharge cylinder 4, thereby effectively slowing down the slag discharge speed. At the same time, due to the material accumulation caused by this blockage, the slag discharge speed is effectively controlled. The waste slag in the tank body is changed from the original dispersed high-speed discharge to a controlled full-pipe slow discharge, which greatly reduces the amount of air returning to the inside of the tank body, eliminates the phenomenon of furnace top back smoke and fire, and thus better solves the problems of further reducing pollutant emissions, improving the furnace top operation environment and the damage of hot smoke flow to the furnace top facilities.

[0017] 2. The wedge-shaped sealing cover 6 at the lower port of the elbow-shaped slag discharge cylinder 4 is arranged obliquely and adopts a wedge-shaped structure. It can effectively utilize its own weight to improve the sealing condition, and completely solves the problems existing in the existing vertical sealing cover at the lower part of the reduction tank, such as inconvenient opening and closing, poor sealing, inability to well maintain the vacuum degree in the reduction tank, and the need for multiple bolts to fasten.

[0018] 3. A slag transport vehicle 8 with a movable slag receiving cylinder is provided in the supporting upper part. The movable slag receiving cylinder 11 is used in combination with the elbow-shaped slag discharge cylinder 4. An adjustable-opening flap 12 is installed inside the upper port of the movable slag receiving cylinder 11, which controls the slag discharge speed again and also achieves the purpose of suppressing the return of the dust-containing gas in the slag transport vehicle 8 to the reduction tank 1.

[0019] 4. The movable slag receiving cylinder 11 placed on the slag transport vehicle 8 is guided by a gear 10 and a rack 9 and can move within a certain range, which is convenient for the opening and closing and sealing between slag discharge and interfaces.

Claims

1. Dust suppression and slag discharging system for vertical shaft reduction furnace of magnesium alloy, characterized in that: It includes an elbow-shaped slag discharge cylinder (4). The upper flange (3) of the slag discharge cylinder of the elbow-shaped slag discharge cylinder (4) is connected to the slag discharge port flange (2) of the reduction tank. The lower flange (5) of the slag discharge cylinder of the elbow-shaped slag discharge cylinder (4) is connected to a sealing cover. The funnel-shaped slag discharger (7) is increased with a downward extension section. The downward extension section of the funnel-shaped slag discharger (7) extends into the elbow-shaped slag discharge cylinder (4). The sealing cover connected to the lower flange (5) of the slag discharge cylinder is a wedge-shaped sealing cover (6), and the wedge-shaped sealing cover (6) is inclined. It also includes a slag transport vehicle (8) with a movable slag receiving cylinder at the upper part. The movable slag receiving cylinder (11) is matched with the elbow-shaped slag discharge cylinder (4). Inside the upper opening of the movable slag receiving cylinder (11), there is a flap (12) with adjustable opening degree. A rack (9) is arranged at the upper part of the slag transport vehicle (8), and a gear (10) matched with the rack (9) is arranged on the movable slag receiving cylinder (11). This dust suppression and slag discharge system effectively controls the slag discharge speed, and at the same time greatly reduces the amount of air returning to the inside of the reduction tank, thus achieving the problem of preventing smoke and fire from returning from the furnace top. The wedge-shaped sealing cover is convenient to open and close, and can well maintain the vacuum degree inside the reduction tank.

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