Gas collecting flue device of aluminum electrolysis cell

Abstract

The utility model discloses a gas collection flue device of an aluminum electrolysis cell, relates to the technical field of aluminum electrolysis flue gas purification, and mainly aims to clean accumulated dust in the production process without stopping production to treat the accumulated dust and improve the production efficiency. According to the main technical scheme, the gas collection flue device of the aluminum electrolysis cell comprises a gas collection flue, a plurality of gas collection ports and a vibration excitation mechanism, the gas collecting flue is arranged above the electrolytic tank cover plate; the plurality of gas collecting ports are sequentially arranged along the plate surface of the electrolytic tank cover plate and are respectively communicated with the gas collecting flue; the shock excitation mechanism comprises a piston cylinder, a disc and a connecting rod mechanism, a connecting rod of the connecting rod mechanism extends along the gas collecting flue, the center of the disc is fixedly connected to an input shaft of the connecting rod mechanism, one end of the piston cylinder is hinged to the pipe wall of the gas collecting flue, the other end of the piston cylinder is hinged to the edge of the disc, and a plurality of output shafts of the connecting rod mechanism are connected to shock excitation balls through elastic pieces. The shock excitation ball is driven to knock the wall of the gas collecting flue.

Description

TECHNICAL FIELD

[0001] The utility model relates to aluminum electrolysis flue gas purification technical field especially relates to a kind of aluminum electrolysis cell gas collection flue device. BACKGROUND

[0002] In the aluminum electrolysis production process, along with electrochemical reaction, a large amount of flue gas, dust will be generated, which seriously affects human health and destroys the ecological environment. Therefore, the aluminum electrolysis production system is equipped with a special flue gas capture and purification system for collecting these harmful gases and transporting the gases to the purification system for purification treatment.

[0003] The electrolytic dust-containing flue gas generally enters the flue branch pipe through the gas collection hood under negative pressure, then flows into the flue main pipe from the flue branch pipe, and finally enters the purification system. After a period of production, a large amount of dust deposits in the flue, especially at the connection of the flue. When the dust deposition is too much, it will cause the flue to be blocked, and the negative pressure of the system will be reduced, thereby affecting the capture of flue gas. The traditional flue cleaning is to manually check the accumulated dust in the flue at regular intervals. If accumulated dust is found in the flue, the flue branch pipe valve is opened, and the accumulated dust is cleaned by blowing with high-pressure air. The inspection needs to be carried out during shutdown, and the labor intensity is high. The cleaning effect is not good, and it will cause secondary pollution to the surrounding environment. SUMMARY

[0004] Therefore, the utility model provides an aluminum electrolysis cell gas collection flue device, the main purpose is to clean the accumulated dust during production, without stopping production to handle the accumulated dust, and improve the production efficiency.

[0005] To achieve the above-mentioned purpose, the utility model mainly provides the following technical scheme:

[0006] The utility model provides an aluminum electrolysis cell gas collection flue device, which comprises a gas collection flue, a plurality of gas inlets and a vibration excitation mechanism.

[0007] The gas collection flue is arranged above the electrolysis cell cover plate.

[0008] The plurality of gas inlets are arranged in sequence along the surface of the electrolysis cell cover plate, and the plurality of gas inlets are respectively connected to the gas collection flue.

[0009] The vibration excitation mechanism comprises a piston cylinder, a disc and a connecting rod mechanism. The connecting rod of the connecting rod mechanism extends along the gas collection flue. The center of the disc is fixedly connected to the input shaft of the connecting rod mechanism. One end of the piston cylinder is hinged to the pipe wall of the gas collection flue, and the other end is hinged to the edge of the disc. A plurality of output shafts of the connecting rod mechanism are connected to the vibration excitation ball through elastic members for driving the vibration excitation ball to knock the wall of the gas collection flue.

[0010] The technical solutions of the utility model can further realize the purposes and solve the technical problems.

[0011] Optionally, the electrolytic cell cover plate is the bottom wall of the gas collecting flue, the electrolytic cell cover plate is formed by sequentially arranging a plurality of material boxes, each gas collecting port is located between two adjacent material boxes, the gas collecting port is provided with a control valve, a temperature sensor is arranged in the space below the gas collecting port, and the control valve and the temperature sensor are interlocked.

[0012] Optionally, a first direction extends from the center line of the top wall of the material box to the opposite side edge of the top wall of the material box, and the first direction has a downward inclination angle.

[0013] Optionally, the utility model further comprises a turning plate, opposite side edges of the top wall of the material box are respectively provided with discharge ports, a pivot of one side edge of the turning plate is pivotally connected to one side edge of the discharge port, a torsional spring is arranged on the pivot and used for driving the other side edge of the turning plate to rotate upwards and abut against the other side edge of the discharge port.

[0014] Optionally, the elastic member is a spring, one end of the spring is fixedly connected to the output shaft of the connecting rod mechanism, and the other end of the spring is fixedly connected to the exciting ball.

[0015] Optionally, the elastic member is a rubber rod, one end of the rubber rod is fixedly connected to the output shaft of the connecting rod mechanism, and the other end of the rubber rod is fixedly connected to the exciting ball.

[0016] By the above technical solutions, the utility model has at least the following advantages:

[0017] During the operation of the electrolytic cell, flue gas generated by the electrolytic cell enters the gas collecting flue through the plurality of gas collecting ports, during the above process, the piston rod of the piston cylinder extends and retracts, drives the disc to reciprocatingly rotate, the rotating disc drives the input shaft of the connecting rod mechanism to reciprocatingly rotate, the connecting rod drives the plurality of output shafts to reciprocatingly rotate, the output shaft drives the exciting ball to reciprocatingly swing through the elastic member, so that the exciting ball reciprocatingly knocks the gas collecting flue wall.

[0018] The exciting ball knocks the gas collecting flue, knocks off the deposited dust from the inner side wall of the gas collecting flue, and can enter the purification system along with the flue gas under negative pressure, ensures that the flue pipe is unobstructed, increases the negative pressure in the pipeline, and reduces the flue gas flow resistance. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1The utility model provides a side view of aluminum electrolysis trough gas collecting flue device for the embodiment of the utility model,

[0020] Figure 2 The utility model provides a plan view of aluminum electrolysis trough gas collecting flue device for the embodiment of the utility model,

[0021] Figure 3 For Figure 1 The enlarged view of A part in the middle,

[0022] Figure 4 The utility model provides a side view of another aluminum electrolysis trough gas collecting flue device for the embodiment of the utility model.

[0023] The reference signs in the drawings of the specification include: gas collecting flue 1, gas collecting port 2, piston cylinder 3, disc 4, input shaft 5, output shaft 6, exciting ball 7, connecting rod 8, rocker 9, material box 10, temperature sensor 11, turning plate 12, discharging port 13, pivot 14, torsional spring 15, spring 16, rubber stick 17, controller 18. Specific implementation

[0024] In order to further explain the technical means and effects adopted by the utility model to achieve the predetermined utility model purposes, the specific implementation, structure, features and effects according to the utility model application are described in detail as follows by combining with the drawings and preferred embodiments. In the following description, different "an embodiment" or "embodiments" do not necessarily refer to the same embodiment. In addition, the specific features, structures or characteristics in one or more embodiments can be combined in any suitable form.

[0025] The utility model will be further described in detail in combination with the drawings and embodiments.

[0026] As Figure 1 And Figure 2 An embodiment of the utility model provides a kind of aluminum electrolytic cell gas collecting flue device, it includes: gas collecting flue 1, multiple gas collecting ports 2 and exciting mechanism;

[0027] Gas collecting flue 1 is arranged in the upper of electrolytic cell cover plate;

[0028] Multiple gas collecting ports 2 are sequentially arranged along the board surface of electrolytic cell cover plate, and multiple gas collecting ports 2 are communicated in gas collecting flue 1 respectively;

[0029] Exciting mechanism includes piston cylinder 3, disc 4 and connecting rod 8 mechanism, the connecting rod 8 of connecting rod 8 mechanism extends along gas collecting flue 1, the center of disc 4 is fixedly connected to the input shaft 5 of connecting rod 8 mechanism, one end of piston cylinder 3 is hinged to the pipe wall of gas collecting flue 1, the other end is hinged to the edge of disc 4, multiple output shafts 6 of connecting rod 8 mechanism are connected to exciting ball 7 by elastic member, for driving exciting ball 7 to knock gas collecting flue 1 wall.

[0030] The working process of an aluminum electrolysis cell gas collection flue device is as follows:

[0031] During the operation of the electrolytic cell, the flue gas generated by the electrolytic cell enters the gas collection flue 1 through multiple gas collection ports 2. During the above process, the piston rod of the piston cylinder 3 moves back and forth, driving the disc 4 to rotate back and forth. The rotating disc 4 drives the input shaft 5 of the connecting rod 8 mechanism to rotate back and forth. The connecting rod 8 drives multiple output shafts 6 to rotate back and forth. The output shafts 6 drive the excitation ball 7 to swing back and forth through the elastic element, thereby causing the excitation ball 7 to repeatedly strike the wall of the gas collection flue 1.

[0032] The vibrating ball 7 knocks down the dust from the inner wall of the gas collecting duct 1, removing the deposited dust. Under negative pressure, the dust can then enter the purification system with the flue gas, ensuring unobstructed flow, increasing the negative pressure within the duct, and reducing gas flow resistance. The vibrating ball 7 can clean accumulated dust during aluminum electrolysis cell production without requiring production shutdowns, thus improving production efficiency. Furthermore, because the vibrating ball 7 is located on the outside of the gas collecting duct 1, it does not affect the duct's sealing performance, and the knocked-down dust enters the purification system with the flue gas, preventing secondary pollution.

[0033] In the technical solution of this utility model, ash cleaning is carried out during the production process of the electrolytic cell, eliminating the need to stop production to deal with the ash accumulation and improving production efficiency.

[0034] Specifically, the linkage mechanism includes a connecting rod 8, multiple rockers 9, an input shaft 5, and multiple output shafts 6. The connecting rod 8 extends along the gas collecting flue 1. The input shaft 5 and multiple output shafts 6 are arranged sequentially along the wall of the gas collecting flue 1. The input shaft 5 and output shafts 6 are respectively mounted on the upper side wall of the gas collecting flue 1 through bearings. One end of each of the multiple rockers 9 is hinged to the connecting rod 8, and the other end of each rocker 9 is fixedly welded to the input shaft 5 or the output shaft 6. The center key of the disc 4 is connected to the input shaft 5. The disc 4 drives the input shaft 5 to reciprocate. The input shaft 5 drives the connecting rod 8 to reciprocate through the rockers 9. The multiple output shafts 6 reciprocate synchronously, thereby driving the elastic element to reciprocate at a certain angle. The excitation ball 7, along with the rotating elastic element, strikes the upper side wall of the gas collecting flue 1.

[0035] Specifically, each gas collecting port 2 corresponds to a material feeding port.

[0036] like Figure 1 As shown, in a specific embodiment, the cell cover plate of the electrolytic cell is the bottom wall of the gas collection flue 1. The cell cover plate of the electrolytic cell is composed of multiple material boxes 10 arranged in sequence. Each gas collection port 2 is located between two adjacent material boxes 10. A control valve is installed in the gas collection port 2. A temperature sensor 11 is installed in the space below the gas collection port 2. The control valve and the temperature sensor 11 are interlocked for control.

[0037] In this embodiment, specifically, after replacing the anode at each feed burner with a new anode, there is a sudden decrease in the amount of flue gas from a specific burner for 2-48 hours. At this burner, almost no high-temperature flue gas is emitted. Simultaneously, due to various reasons, some feed burners may become blocked, resulting in no flue gas exiting. This leads to more flue gas being emitted from other feed burners. Consequently, this fixed gas collection connection method cannot effectively extract flue gas from the electrolytic cell, resulting in insufficient gas collection efficiency, high fluoride consumption, and increased fugitive emissions, among other negative consequences. This patented structure installs a control valve between each gas collection hood and the horizontal flue, allowing adjustment of its opening degree as needed.

[0038] Specifically, the control valve is a butterfly valve with a temperature resistance of 350℃ or higher. When a feeding port is blocked and no smoke is discharged, the temperature sensor 11 located below the gas collecting port 2 monitors that the temperature of the local area is relatively low. On the other hand, for the feeding ports that are not blocked, smoke is discharged and the temperature sensor 11 monitors that the temperature is relatively high. In this way, a temperature gradient of smoke is formed between adjacent groups of ports. According to the change of the smoke temperature gradient, the controller 18 sends instructions to different control valves. The control valve in the lower temperature area (less smoke is discharged) has a relatively small opening, and the control valve in the higher temperature area (more smoke is discharged) has a relatively large opening.

[0039] Specifically, the control valve adopts a pneumatic control method;

[0040] Specifically, the control valve is a butterfly valve, the valve plate surface of which is coated with a silicon carbide wear-resistant coating, and the valve shaft adopts a double packing gland sealing structure;

[0041] By adjusting the gas collection method described above, the gas collection efficiency of the electrolyzer is improved.

[0042] like Figure 1 As shown, in a specific embodiment, the direction extending from the center line of the top wall of the material box 10 to the opposite side of the top wall of the material box 10 is the first direction, and the first direction has a downward tilt angle.

[0043] In this embodiment, specifically, the dust that settles to the top wall of the material box 10 can slide down in the first direction and partially reverse through the air collection port 2, thereby avoiding the accumulation of a large amount of dust in the air collection flue 1 and keeping the space inside the air collection flue 1 unobstructed.

[0044] like Figure 1 and Figure 3 As shown, in a specific embodiment, a flap 12 is also included. A discharge port 13 is provided on the opposite sides of the top wall of the material box 10. A pivot 14 on one side of the flap 12 is rotatably connected to one side edge of the discharge port 13. A torsion spring 15 is installed on the pivot 14 to drive the other side of the flap 12 to rotate upward and abut against the other side edge of the discharge port 13.

[0045] In the prior art, the material box 10 is filled with alumina powder, which is used to deliver the alumina powder to the down-comer fire hole, so the alumina component accounts for a certain proportion in the smoke dust discharged from the fire hole of the electrolytic cell;

[0046] In the present embodiment, with the increase of the dust gathered on the opposite side of the top wall of the material box 10 in the gas collection flue 1, the dust is accumulated on the flap 12, the gravity of the increased dust overcomes the torsion of the torsion spring 15, the other side edge of the flap 12 is turned down, and the dust on the flap 12 enters the material box 10 through the down-comer 13, so that the alumina component in the dust can be added to the down-comer fire hole again.

[0047] Specifically, when the flap 12 is free of dust and the other side edge of the flap 12 is turned up to abut against the other side edge of the down-comer 13 under the drive of the torsion spring 15, the flap 12 cannot be turned up any more, so that the flap 12 closes the down-comer 13, avoiding the alumina powder in the material box 10 from being sucked into the gas collection flue 1 by the negative pressure.

[0048] As shown in Figure 1 and Figure 2 In the specific embodiment, the elastic member is a spring 16, one end of the spring 16 is fixedly connected to the output shaft 6 of the linkage mechanism, and the other end of the spring 16 is fixedly connected to the vibration ball 7.

[0049] In the present embodiment, specifically, the spring 16 drives the vibration ball 7 to reciprocatingly swing and knock the upper side wall of the gas collection flue 1, the spring 16 has a certain toughness and is not easy to break, and has a sustained durability.

[0050] As shown in Figure 4 In the specific embodiment, the elastic member is a rubber rod 17, one end of the rubber rod 17 is fixedly connected to the output shaft 6 of the linkage mechanism, and the other end of the rubber rod 17 is fixedly connected to the vibration ball 7.

[0051] In the present embodiment, specifically, the rubber rod 17 is made of fluorine rubber material, which can withstand a high temperature above 300℃, and enables the rubber rod 17 to drive the vibration ball 7 to reciprocatingly swing for a long time during the operation of the electrolytic cell.

[0052] The above merely describes the specific embodiments of the present application, but the protection scope of the present application is not limited thereto, any skilled person in the art can easily think of changes or replacements within the technical range disclosed by the present application, which shall be covered in the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. An aluminum electrolysis cell gas collection stack arrangement, characterized by, The utility model relates to an aluminum electrolytic cell gas collecting flue device, comprising: a gas collecting flue arranged above a cell cover plate of an electrolytic cell; a plurality of gas inlets arranged in sequence along the surface of the cell cover plate, each of the gas inlets being connected to the gas collecting flue; a vibration excitation mechanism comprising a piston cylinder, a disc and a connecting rod mechanism, the connecting rod of the connecting rod mechanism extending along the gas collecting flue, the center of the disc being fixedly connected to the input shaft of the connecting rod mechanism, one end of the piston cylinder being hingedly connected to the wall of the gas collecting flue and the other end being hingedly connected to the edge of the disc, a plurality of output shafts of the connecting rod mechanism being connected to a vibration excitation ball through elastic members for driving the vibration excitation ball to knock the wall of the gas collecting flue.

2. The aluminum electrolytic cell gas collecting flue device according to claim 1, wherein: the cell cover plate of the electrolytic cell is the bottom wall of the gas collecting flue, the cell cover plate of the electrolytic cell is arranged by a plurality of material boxes in sequence, each of the gas inlets is located between two adjacent material boxes, a control valve is arranged in each of the gas inlets, a temperature sensor is arranged in the space below each of the gas inlets, and the control valve and the temperature sensor are interlocked.

3. The aluminum electrolytic cell gas collecting flue device according to claim 2, wherein: the direction from the center line of the top wall of the material box to the opposite side of the top wall of the material box is a first direction, and the first direction has a downward inclination angle.

4. The aluminum electrolytic cell gas collecting flue device according to claim 3, further comprising a turning plate, wherein: the opposite side of the top wall of the material box is provided with a discharge port, the pivot of one side of the turning plate is rotatably connected to the side edge of the discharge port, a torsional spring is arranged on the pivot, and the other side of the turning plate is driven to rotate upward to abut against the other side edge of the discharge port.

5. The aluminum electrolytic cell gas collecting flue device according to any one of claims 1 to 4, wherein: the elastic member is a spring, one end of the spring is fixedly connected to the output shaft of the connecting rod mechanism, and the other end of the spring is fixedly connected to the vibration excitation ball.

6. The aluminum electrolytic cell gas collecting flue device according to any one of claims 1 to 4, wherein: the elastic member is a rubber rod, one end of the rubber rod is fixedly connected to the output shaft of the connecting rod mechanism, and the other end of the rubber rod is fixedly connected to the vibration excitation ball.

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