Aluminum liquid external refining waste gas treatment device

Abstract

The utility model relates to the field of external refiner corollary equipment, in particular to a molten aluminum external refining waste gas treatment device which is mounted on the outer furnace wall of an external refiner and comprises a plurality of gas suction pipelines which are bent into circular arcs and circumferentially distributed in a horizontal plane at the top end of the furnace wall, the bending curvatures of the gas suction pipelines are the same, and the gas suction pipelines are connected to the furnace wall in a sliding manner; a plurality of air suction ports are formed in one side, close to the furnace wall, of the air suction pipeline; the air pipe is mounted at one end of the air suction pipeline away from the furnace wall; the mounting plate is horizontally arranged and fixed to the furnace wall, an air pump is arranged on the mounting plate, and the air pump communicates with the air pipe; and the sliding part is slidably connected to one side of the mounting plate and the furnace wall and drives the pipeline to horizontally and vertically slide. The cover has the advantages that opening and closing of the cover are not hindered, and workshop modification cost is reduced.

Description

Technical Field

[0001] This application relates to the field of equipment for ladle refining machines, and in particular to a device for treating exhaust gas from external refining of molten aluminum. Background Technology

[0002] Ladle refining machines play an important role in the aluminum molten metal smelting process. They are mainly used to remove impurities, reduce gas content, and improve the purity of the aluminum molten metal. Due to their high degassing efficiency, safe operation, and lower energy consumption compared to in-furnace refining, ladle refining machines are widely used in aluminum molten metal dealkali removal and aluminum alloy refining.

[0003] The ladle refining process includes desulfurization, deoxidation, and slag formation, inevitably generating toxic and harmful waste gases such as sulfur dioxide and carbon dioxide. When the ladle refining machine is opened, the pressure and temperature changes inside the furnace cause a large amount of flue gas to escape instantly, polluting the air inside the plant. Therefore, ladle refining machines generally need to be equipped with waste gas treatment devices to collect waste gas in a timely manner. However, existing waste gas treatment devices require building a waste gas treatment room and laying pipelines in the workshop. The pipelines run from the workshop roof to the waste gas treatment room, which requires complex modifications to the workshop's pipeline network, greatly increasing construction costs. In addition, the air intake of the existing waste gas treatment device is located above the ladle refining machine, increasing the burden of opening the lid and making it difficult to open. Summary of the Invention

[0004] In order to avoid obstructing the opening and closing of the lid and reduce workshop renovation costs, this invention provides an external refining waste gas treatment device for molten aluminum.

[0005] The present invention provides an external refining waste gas treatment device for molten aluminum, which adopts the following technical solution:

[0006] An external refining waste gas treatment device for molten aluminum, installed on the outer wall of the furnace of an external refining machine, includes:

[0007] The suction pipes are curved into arcs and multiple pipes are distributed circumferentially on a horizontal plane at the top of the furnace wall. The multiple suction pipes have the same curvature and are slidably connected to the furnace wall. The suction pipes are horizontally arranged and have multiple suction ports on the side near the furnace wall.

[0008] A gas pipe is installed at the end of the air intake pipe away from the furnace wall and connected to the air intake port;

[0009] The mounting plate is horizontally set and fixed to the furnace wall. An air pump is installed on the mounting plate and the air pump is connected to the air pipe.

[0010] The sliding component is slidably connected to one side of the mounting plate and the furnace wall, driving the air intake pipe to slide horizontally and vertically.

[0011] By adopting the above technical solution, an air intake pipe is installed on the ladle refining machine. The air intake pipe is an arc-shaped pipe that can be slidably set so that the position of the air intake pipe can be changed. When the ladle refining machine is smelting aluminum liquid normally, the air intake pipe is connected end to end in a horizontal plane and surrounds the outside of the furnace wall to form an annular pipe. In other words, when the ladle refining machine is working normally, the volume of the air intake pipe is minimized to avoid occupying the internal space of the plant as much as possible.

[0012] When the ladle refining machine is opened, the sliding component drives the suction pipe to slide horizontally and vertically, causing multiple suction pipes of the annular tube to rise and move away from the furnace wall, moving radially along the furnace wall. This causes the annular tube to open, allowing the air pump to draw in air. The negative pressure is then transmitted to the inside of the suction pipe through the air pipe, and the exhaust gas released after the ladle refining machine is opened is drawn in from the edges of the top wall. In the above scheme, common rigid rubber tubing can be selected for the air pipe, which combines toughness and flexibility.

[0013] Optionally, multiple air intake ports can be connected together.

[0014] By adopting the above technical solution, the intake port is connected to expand the intake area of ​​the intake port, thereby improving the intake pipe's ability to absorb waste gas. That is, the diameter area of ​​the intake port is extended to both ends of the intake pipe, and the area of ​​the intake port is expanded to the maximum based on structural support.

[0015] Optionally, a filter screen is provided on the air intake.

[0016] By adopting the above technical solution, since metal slag particles inevitably exist in the plant, when the air pump is operating, the air pump continuously draws in air to provide negative pressure, which may absorb the metal slag particles in the plant into the air pipe and scratch the inner wall of the air pipe. Therefore, a filter screen with a certain mesh size is set up to filter out large-diameter metal particles and protect the air pipe.

[0017] Optionally, the carriage is horizontally or curved and slidably connected to the mounting plate, with electric push rods vertically installed at both ends of the top side of the carriage; the top end of the piston rod of the electric push rod is fixed to the air intake pipe;

[0018] The sliding direction of the slide is parallel to the horizontal radial direction of the ladle refining machine.

[0019] By adopting the above technical solution, the slide is the main structure supporting the horizontal sliding of the suction pipe, and the electric push rod is the main structure supporting the vertical sliding of the suction pipe. In order to stabilize the sliding of the slide, the bottom of the slide is plate-shaped, and electric push rods are vertically installed at both ends. The electric push rods push and cooperate with the horizontal sliding of the slide, so that the suction pipe can slide both in the horizontal plane and radially of the furnace body, and also slide vertically. This is the main way to form a ring pipe body by multiple arc-shaped suction pipes.

[0020] When the lid is opened, the arc-shaped air intake pipe slides and tilts synchronously with the lid in a direction away from the furnace wall, without affecting the opening process.

[0021] Optionally, the mounting plate has a horizontal through groove in the center, the bottom wall of the through groove has a sliding groove, and the bottom wall of the slide is provided with a roller corresponding to the sliding groove, with the roller surface abutting against the sliding groove wall.

[0022] By adopting the above technical solution, the through groove is used for the stable sliding of the bottom plate structure of the slide. The center part of the bottom plate structure of the slide passes through the through groove, the bottom height of the slide is adapted to the height of the through groove, and then the slide can slide radially along the ladle refining machine through the guide sliding of the corresponding slide groove and roller on the bottom wall of the through groove.

[0023] Optionally, the mounting plate can be detached from the end facing away from the furnace wall.

[0024] By adopting the above technical solution, the detachable design allows the slot to be opened, and a certain slide can be removed by simple sliding for replacement and maintenance, further improving the operability of the waste gas treatment device and facilitating disassembly.

[0025] Optional, also includes:

[0026] An adsorption box, installed on each of the mounting plates, is connected to the air pump.

[0027] By adopting the above technical solution, the adsorption box is selected as an activated carbon adsorption box, which has a small volume and can save internal space in the plant. It can also be installed on the furnace wall to quickly treat the waste gas emitted in the furnace. Generally, factories use waste gas treatment towers for waste gas, which need to introduce the waste gas in the workshop into the waste gas treatment tower for complete treatment.

[0028] The above-mentioned filter screen removes large-diameter metal slag particles, but small-diameter metal slag particles need to be completely removed by adsorption in the adsorption box when the exhaust gas enters the exhaust gas treatment tower to avoid damage to the exhaust gas treatment tower.

[0029] Optional, also includes:

[0030] An exhaust pipe connects to multiple adsorption boxes and transports the waste gas output from the adsorption boxes.

[0031] By adopting the above technical solution, the waste gas adsorbed and treated by multiple adsorption boxes is discharged into the waste gas treatment tower through subsequent pipelines. The multiple pipelines of the adsorption boxes are integrated into a single outlet pipeline, which is then drawn into the waste gas treatment tower by an internal air pump. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application.

[0033] Figure 2This is a structural schematic diagram of the exhaust gas treatment component in the embodiments of this application.

[0034] Figure 3 This is a structural schematic diagram made to highlight the air intake in the embodiments of this application.

[0035] Figure 4 This is a structural schematic diagram made to highlight the through-groove in the embodiments of this application.

[0036] Figure 5 This is a structural schematic diagram in the embodiments of this application, made to highlight the open state of the ladle refining machine.

[0037] Explanation of reference numerals in the attached drawings: 1. Ladle refining machine; 2. Waste gas treatment assembly; 21. Mounting plate; 211. Through slot; 212. Slide groove; 22. Arc plate; 23. Electric push rod; 24. Suction pipe; 25. Filter screen; 26. Adsorption box; 27. Air pump; 28. Exhaust pipe. Detailed Implementation

[0038] The following is in conjunction with the appendix Figure 1-5 This application will be described in further detail.

[0039] This application discloses an external refining waste gas treatment device for molten aluminum. (Refer to...) Figure 1 An external refining waste gas treatment device for molten aluminum is installed on the furnace wall of the external refining machine 1. It consists of multiple sets of waste gas treatment components 2, which are distributed circumferentially along the furnace wall and surround the outer side of the furnace wall. Each set of waste gas treatment components 2 has the same structure, and one set is described as an example.

[0040] Reference Figure 1 and Figure 2 Each exhaust gas treatment assembly 2 has a main structure including a mounting plate 21 with one edge formed on the furnace wall, mounted on the furnace wall. A through groove 211 is horizontally inserted through the middle of the mounting plate 211, and an arc-shaped plate 22 is slidably connected within the through groove 211. The arc-shaped plate 22 is horizontally positioned, with its surface being an arc shape adapted to the furnace wall. The arc-shaped plates 22 on each exhaust gas treatment assembly 2 are distributed along an arc line. Two electric push rods 23 are vertically mounted at both ends of the arc-shaped plate 22. The bottom ends of the two electric push rods 23 are fixed to the top ends of the electric push rods 23, or in other words, the piston rod ends are connected to suction pipes 24. The suction pipes 24 are arc-shaped, with the same curvature as the arc-shaped plate 22. The bottom ends of both ends are fixed to the piston rod ends of the electric push rods 23. Under the action of the two electric push rods 23, the suction pipes 24 can maintain horizontal movement.

[0041] Reference Figure 2 and Figure 3The air intake pipe 24 is hollowed out, and an air intake port is opened on a vertical side wall near the furnace wall, connecting the internal space of the air intake pipe 24 to the outside. The two ends of the air intake port extend to both ends of the air intake pipe 24, maximizing the diameter area of ​​the air intake port. An air pipe is connected to the vertical side wall of the air intake pipe 24 away from the air intake port. The air pipe is inserted into and fixed inside the air intake pipe 24, connecting to the internal space of the air intake pipe 24. An air pump 27 is fixed to the mounting plate 21. The air pump 27 is connected to the air pipe. When the air pump 27 operates, it draws air from inside the air intake pipe 24 through the air pipe, and then draws air from the top edge of the external refining mill 1 through the air intake port. Thus, when the external refining mill 1 is opened, the electric push rod 23 simultaneously pushes the air intake pipe 24 upward, close to the top of the external refining mill 1, to draw in waste gas when the cover is opened. Considering that metal slag particles sucked into the trachea can easily damage it, multiple thin metal rods are horizontally arranged and vertically distributed in the section of the suction pipe 24 corresponding to the suction port, forming a filter screen 25. This filter screen removes any metal slag particles that the suction pipe 24 may have absorbed, preventing large-diameter metal slag particles from entering the suction pipe 24 and affecting the trachea. Of course, the filter screen 25 alone cannot remove small metal slag particles from the waste, and the content of small metal slag particles is significantly greater than that of large metal slag particles. In this embodiment, an adsorption box 26 is fixed to the mounting plate 21. The adsorption box 26 is an activated carbon adsorption box 26, and the aforementioned air pump 27 is set at the top of the adsorption box 26, so that the air pump 27 is connected to the adsorption box 26 through an air pipe.

[0042] For ease of observation, the filter screen 25 conceals part of the metal rod in this embodiment; the air tube in this embodiment is made of rigid rubber tubing, which can withstand any deformation within a reasonable range.

[0043] Reference Figure 2 and Figure 4 A through groove 211 is horizontally provided on the mounting plate 21, and the center part of the arc-shaped plate 22 passes through the through groove 211. Multiple sliding grooves 212 are parallel to each other on the bottom wall of the through groove 211. The sliding grooves 212 are perpendicular to the cross-section of the furnace wall at the corresponding position. A roller is rotatably connected to the bottom end of the arc-shaped plate 22 corresponding to the sliding groove 212. The roller's wheel shape is adapted to the through groove 211. By the rolling of the roller inside the sliding groove 212, the arc-shaped plate 22 is driven, which in turn drives the intake pipe to slide horizontally. Thus, the intake pipe moves horizontally and vertically through the cooperation of the roller and the drive cylinder. To facilitate the replacement of the exhaust gas treatment component 2, the mounting plate 21 is detachably installed on a vertical side wall away from the external refining furnace. When detached, one side of the through groove 211 is open, and the arc-shaped plate 22 is slid out of the through groove 211, thereby removing the intake pipe 24 and the electric push rod 23.

[0044] Looking back Figure 1The filtered gas from the adsorption box 26 is discharged through the gas pipe. Each filter box has a gas pipe extending downward from one side. Each end of the multiple gas pipes extending from the filter box is provided with an outlet pipe 28. One end of the outlet pipe 28 extends to the outside of the plant and is transported to the external waste gas treatment tower.

[0045] The implementation principle of the aluminum liquid external refining waste gas treatment device in this application embodiment is as follows: (Refer to...) Figure 1 and Figure 5 An air intake pipe 24 is installed on the ladle refining machine 1. The air intake pipe 24 is an arc-shaped pipe that can be slidably set so that the position of the air intake pipe 24 can be changed. When the ladle refining machine 1 is smelting aluminum liquid normally, the air intake pipe 24 is connected end to end in a horizontal plane and surrounds the outside of the furnace wall to form an annular pipe. In other words, when the ladle refining machine 1 is working normally, the volume of the air intake pipe 24 is minimized to avoid occupying the internal space of the plant as much as possible.

[0046] When the ladle refining machine 1 is opened, the sliding component drives the suction pipe 24 to slide horizontally and vertically, causing the multiple suction pipes 24 of the annular tube to rise and move away from the furnace wall, moving radially along the furnace wall. That is, the annular tube opens, and the air pump 27 draws in air, transmitting negative pressure to the inside of the suction pipe 24 through the air pipe. This, along with the surrounding area of ​​the top wall edge of the ladle refining machine 1, draws in the waste gas that dissipates after the opening. The state is as follows: Figure 5 As shown.

[0047] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. An apparatus for treating exhaust gas from external refining of molten aluminum, characterized by comprising: The application relates to an installation on the outer wall of an external refining machine (1), which comprises: a plurality of air suction pipes (24) arranged in a circumferential direction on a horizontal plane at the top of the wall, the air suction pipes (24) having the same bending curvature, and the air suction pipes (24) being slidably connected to the wall; the air suction pipes (24) are horizontally arranged and provided with a plurality of air suction openings on the side close to the wall; an air pipe connected to the air suction openings and arranged on the end of the air suction pipes (24) away from the wall; a mounting plate (21) horizontally arranged and fixed to the wall, the mounting plate (21) being provided with an air pump (27) connected to the air pipe; a sliding member slidably connected to one side of the mounting plate (21) and the wall, and used for driving the air suction pipes to slide horizontally and vertically.

2. The device for treating off-gas from external refining of liquid aluminum according to claim 1, characterized in that: The plurality of air suction openings are connected.

3. A device for treating off-gas from external refining of liquid aluminium according to claim 2, characterised in that: A filter screen (25) is arranged on the air suction opening.

4. The device for treating off-gas from external refining of molten aluminum according to claim 1, characterized by The sliding member comprises: a sliding frame horizontally and bendedly arranged and slidably connected to the mounting plate (21), the sliding frame being vertically provided with an electric push rod (23) at the top side of both ends; the piston rod of the electric push rod (23) is fixed to the air suction pipe (24); the sliding direction of the sliding frame is parallel to the horizontal radial direction of the external refining machine (1).

5. A device for treating off-gas from external refining of liquid aluminium according to claim 4, characterised in that: A through slot (211) is horizontally arranged in the central part of the mounting plate (21), a sliding groove (212) is arranged on the bottom wall of the through slot (211), and a roller is arranged on the bottom wall of the sliding frame and corresponds to the sliding groove (212), and the roller surface abuts against the groove wall of the sliding groove (212).

6. A device for treating off-gas from external refining of liquid aluminium as claimed in claim 5, characterised in that: The end of the mounting plate (21) away from the wall is detachably arranged.

7. The device for treating off-gas from external refining of liquid aluminum according to claim 1, characterized by Further comprising: an adsorption box (26) arranged on each mounting plate (21) and connected to the air pump (27).

8. The device for treating exhaust gas from external refining of liquid aluminum according to claim 7, characterized by Further comprising: an air outlet pipe (28) connected to the plurality of adsorption boxes (26) and used for conveying the exhaust gas output by the adsorption boxes (26).

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