Air guide mechanism of slag removal device of aluminum electrolysis flue gas purification system and slag removal device

Abstract

The utility model relates to the technical field of aluminum electrolysis flue gas purification, in particular to an air guide mechanism of a slag removal device of an aluminum electrolysis flue gas purification system and the slag removal device, and the air guide mechanism is characterized in that a folding air guide plate and a driving mechanism for driving the folding air guide plate to fold / stretch are arranged on the windward side of a baffle door; and the folding air guide plate is obliquely and upwards arranged towards the smoke pipe. By means of the air guide mechanism, air flow entering the sediment box from the smoke pipe can be divided, fresh aluminum oxide entering the smoke pipe moves upwards along with the air flow, the inner wall, opposite to the sediment box, of the smoke pipe is prevented from being scoured, the fresh aluminum oxide can be prevented from rotating in the smoke pipe, and therefore abrasion of the inner wall of the smoke pipe can be reduced; a guarantee is provided for stable operation of a flue gas purification process flow; in addition, by arranging the foldable / stretchable folding air guide plate, when the baffle door is opened, the folding air guide plate stretches to guide the airflow, and when the baffle door is closed, the folding air guide plate is folded, and disturbance to the airflow in the smoke pipe is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of aluminum electrolysis fume purification, in particular to an air guide mechanism and a slag removal device of an aluminum electrolysis fume purification system. Background Art

[0002] The electrolytic flue gas generated in the production process of the electrolytic cell contains solid dust: alumina, cryolite, solid fluoride (solid fluorine), carbon slag and electrolyte droplets brought out by the anode gas, etc., which enter the dust collector system through the smoke pipe; because the smoke pipe is long, it is easy to form a crust inside the pipe wall. After the crust falls off, it forms blocks, particles, powders, etc. of uneven sizes, which also enter the dust collector system with the flue gas. In this way, impurities such as powders, particles and blocks of different sizes are brought into the flue gas purification system. After a long time, they will settle, accumulate, adhere, and harden in the flue gas channel or in the dust collector system. The flue gas flow space will gradually decrease, the air flow channel will become narrow, the system resistance will increase, and the flue gas flow rate will decrease. In order to ensure that the flue gas volume remains unchanged, the load of the exhaust (or blast) equipment needs to be increased, thereby increasing the energy consumption of the system.

[0003] Fresh alumina absorbs hydrogen fluoride gas in the fluorine-containing electrolytic flue gas in the dust collector smoke pipe, and then is recovered by the dust collector filter bag and falls into the dust collector ash hopper to form fluorine-containing alumina. The fluorine-containing alumina is then returned to the silo through the ash hopper chute and other processes for electrolytic cell production and use. Because the flue gas contains various impurities, the fluorine-containing alumina often has difficulty in moving materials in the chute when it returns to the chute, and even blocks the material, resulting in the inability of the material to flow normally and return to the fluorine-containing alumina silo normally, hindering the normal operation of the electrolytic flue gas purification system. Most of the difficulties in moving materials and even blockages in various chutes at all levels are due to the large amount of impurities in the material in the chute, which cannot meet the conditions for the chute to move materials.

[0004] At present, a slag removal device is usually added to the bend of the flue gas pipeline to effectively remove the impurities in the flue gas. For example, the document entitled "Research on Slag Removal Device of Aluminum Electrolysis Flue Gas Purification System" published by Yang Guisen et al. states: "The flue gas slag removal device includes a slag box, a door frame, a baffle door, a small hole on the baffle door, a baffle door switch, a quick-open observation hole, and an inspection door", which can effectively remove impurities in the flue gas, reduce the risk of blockage and the number of discharges, and reduce the load of the exhaust fan and the energy consumption of the system operation. In order to simultaneously achieve the slag removal of fresh alumina, most companies currently set the feeding point of fresh alumina at the inspection door, and the airflow entering the flue through the slag box removes impurities from the fresh alumina and sends it into the flue. In the process of the airflow entering the flue from the slag box driving the fresh alumina after impurities are removed to enter the flue, the fresh alumina will directly flush the inner wall of the flue opposite the slag box, causing serious wear of the inner wall of the flue, and even causing damage to the flue, resulting in instability of the flue gas purification process and material leakage. Utility Model Content

[0005] The utility model aims to provide an air guide mechanism and a slag removal device for an aluminum electrolysis flue gas purification system, so as to solve the problem that the airflow entering the smoke pipe through the existing inspection door will drive fresh alumina to impact the inner wall of the smoke pipe opposite the inspection door, resulting in serious wear of the inner wall of the smoke pipe.

[0006] The embodiment of the utility model is realized through the following technical scheme: an air guide mechanism of a slag removal device of an aluminum electrolysis flue gas purification system, the slag removal device comprising a slag box, a baffle door, a baffle switch and an inspection door, the slag box is arranged on the outside of the bend where the smoke pipe turns, the baffle door is hinged on the side of the slag box close to the smoke pipe, and is configured to open and close into the slag box, an air pressure balance hole is provided on the baffle door, the inspection door is provided on the side of the slag box away from the smoke pipe, a folding air guide plate and a driving mechanism for driving the folding air guide plate to fold / extend are provided on the windward surface of the baffle door, and when the folding air guide plate is extended, the folding air guide plate is arranged upwardly and inclined toward the smoke pipe.

[0007] According to a preferred embodiment, the driving mechanism is configured to drive the folding air deflector to fold when the baffle door is closed, and to drive the folding air deflector to extend when the baffle door is opened.

[0008] According to a preferred embodiment, the folding air guide plate is a double folding air guide plate.

[0009] According to a preferred embodiment, the double-folding air guide plate is composed of a first air guide plate, a second air guide plate, a first "L"-shaped support, a second "L"-shaped support, a first connecting member, a second connecting member, a third connecting member and a connecting rod;

[0010] The first "L"-shaped support and the second "L"-shaped support are connected to the windward surface of the baffle door and are arranged obliquely, wherein the first "L"-shaped support is arranged on the side of the windward surface of the baffle door close to its hinge, and the second "L"-shaped support is arranged on the side of the windward surface of the baffle door close to its free end, and the driving mechanism is arranged on the outside of the first "L"-shaped support and is parallel to the first "L"-shaped support;

[0011] The first air guide plate is arranged between the first "L"-shaped support and the second "L"-shaped support, and the upper and lower ends of the first side of the first air guide plate are respectively provided with first rotating shafts, and the first air guide plate is rotatably connected to the first "L"-shaped support and the second "L"-shaped support through the first rotating shaft;

[0012] The second rotating shaft is respectively provided at the upper and lower ends of the second side of the first air guide plate, and the third rotating shaft is respectively provided at the upper and lower ends of the first side of the second air guide plate, and the second connecting member is rotatably connected to the second rotating shaft at the lower end of the first air guide plate and the third rotating shaft at the lower end of the second air guide plate, respectively, and the first connecting member is "L"-shaped, and the first connecting member is rotatably connected to the second rotating shaft at the upper end of the first air guide plate and the third rotating shaft at the upper end of the second air guide plate, and its free end is rotatably connected to the first end of the connecting rod, the connecting rod is parallel to the first air guide plate, and the second end of the connecting rod is rotatably connected to the outer side of the first "L"-shaped support, the second rotating shaft is sleeved with a first gear, and the third rotating shaft is sleeved with a second gear, and the first gear is meshed with the second gear;

[0013] The third connecting member is arranged on the outside of the first "L"-shaped support and is parallel to the first "L"-shaped support. The first end of the third connecting member is fixedly connected to the first rotating shaft at the upper end of the first air guide plate, and the second end of the third connecting member is rotatably connected to the output shaft of the driving mechanism.

[0014] According to a preferred embodiment, the first wind guide plate and the second wind shield plate are both composed of a frame and a bottom plate, the frame is made by welding angle irons, the bottom plate is arranged inside the frame, and the bottom plate is a steel plate greater than or equal to 2 mm.

[0015] According to a preferred embodiment, a baffle door switch handle is provided on the outer side of the sludge box, and the baffle door switch handle is drivingly connected to the hinged end of the baffle door.

[0016] The utility model also provides a slag removal device for an aluminum electrolysis fume purification system, comprising the air guide mechanism as described above.

[0017] An air guide mechanism for a slag removal device in an aluminum electrolysis flue gas purification system and a technical solution for the slag removal device provided in an embodiment of the utility model have at least the following advantages and beneficial effects: through the air guide mechanism provided by the utility model, the diversion of the airflow from the smoke pipe into the slag box and the airflow from the slag box into the smoke pipe can be effectively achieved, so that the fresh alumina entering the smoke pipe moves upward with the airflow to avoid scouring the inner wall of the smoke pipe opposite the slag box, and also to avoid the fresh alumina swirling inside the smoke pipe, thereby reducing the wear on the inner wall of the smoke pipe and providing a guarantee for the stable operation of the flue gas purification process; in addition, by providing a foldable / stretchable folding air guide plate, when the baffle door is opened, the folding air guide plate is stretched to divide and guide the airflow, and when the baffle door is closed, the folding air guide plate is folded to reduce the disturbance of the airflow in the smoke pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic diagram of the layout of the air guide mechanism provided in Example 1 of the utility model;

[0019] Figure 2This is a schematic diagram of the overall structure of the air guide mechanism provided in Example 1 of the utility model;

[0020] Figure 3 A side view of the air guide mechanism provided in Example 1 of the utility model;

[0021] Figure 4 A top view of the air guide mechanism provided in Example 1 of the utility model;

[0022] Icons: 1-sludge box, 2-baffle door, 3-inspection door, 4-smoke pipe, 5-folding air guide plate, 501-first air guide plate, 5011-first rotating shaft, 5012-second rotating shaft, 5013-first gear, 502-second air guide plate, 5021-third rotating shaft, 5022-second gear, 503-first "L" type support, 504-second "L" type support, 505-first connecting piece, 506-second connecting piece, 507-third connecting piece, 508-connecting rod, 6-driving mechanism, 7-outer shell. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0024] Example 1

[0025] Figure 1 This is a schematic diagram of the layout of the air guide mechanism of the slag removal device of the aluminum electrolysis fume purification system of the utility model. Figure 1 As shown, the slag removal device includes a slag box 1, a baffle door 2, a baffle switch and an inspection door 3.

[0026] The sludge box 1 is arranged on the outside of the bend where the smoke pipe 4 turns, and is made of 3mm-5mm steel plate welding. The interface size of the sludge box 1 on the side close to the smoke pipe 4 is consistent with the cross-sectional size of the smoke pipe 4 to be connected, and the height of the sludge box 1 is greater than the smoke pipe 4. Specifically in this embodiment, the interface of the sludge box 1 is flush with the horizontal smoke pipe 4 on the lower side of the bend, and the sludge box 1 sinks 0.5 times the height, which is convenient for impurities and slag to enter and fall into it for storage. The baffle door 2 is hinged on the side of the sludge box 1 close to the smoke pipe 4, and is configured to open and close into the sludge box 1; the baffle door 2 is used to cooperate with the door frame to achieve the partition between the smoke pipe 4 and the sludge box 1.

[0027] The baffle door 2 is provided with an air pressure balance hole. When it is necessary to check the sludge box 1, the baffle door 2 is closed to cut off the air path between the smoke pipe 4 and the sludge box 1. At this time, the air pressure in the sludge box 1 can be released, and the air flow entering the air pressure balance hole is not enough to affect the internal air pressure of the sludge box 1; the inspection door 3 is arranged on the side of the sludge box 1 away from the smoke pipe 4. If it is necessary to clean the debris inside the sludge box 1, the inspection door 3 can be opened. At this time, due to the effect of the baffle door 2, the debris will not be sucked back into the smoke pipe 4 during the cleaning process, thereby ensuring thorough cleaning; after the sludge box 1 is cleaned, the inspection door 3 is closed. At this time, there is a large pressure difference between the sludge box 1 and the smoke pipe 4. In this case, the baffle door 2 is difficult to open. After waiting for some time, due to the air pressure balance hole, there is continuous air flow from the sludge box 1 into the smoke pipe 4 to establish a new air pressure balance. The baffle door 2 can be opened subsequently to resume normal slag removal in the production process.

[0028] Furthermore, in this embodiment, a foldable air guide plate 5 and a driving mechanism 6 for driving the foldable air guide plate 5 to fold / extend are provided on the windward surface of the baffle door 2. When the foldable air guide plate 5 is extended, the foldable air guide plate 5 is arranged upwardly and inclined toward the direction of the smoke pipe 4. Therefore, through the air guide mechanism provided by the utility model, the diversion of the airflow from the smoke pipe 4 to the sludge box 1 and the airflow from the sludge box 1 to the smoke pipe 4 can be effectively achieved, so that the fresh alumina entering the smoke pipe 4 moves upward with the airflow to avoid scouring the inner wall of the smoke pipe 4 opposite to the sludge box 1, and the fresh alumina can be avoided from swirling inside the smoke pipe 4, thereby reducing the wear of the inner wall of the smoke pipe 4 and providing a guarantee for the stable operation of the flue gas purification process. In addition, by providing a foldable / extendable foldable air guide plate 5, when the baffle door 2 is opened, the foldable air guide plate 5 is extended to divide and guide the airflow, and when the baffle door 2 is closed, the foldable air guide plate 5 is folded to reduce the disturbance of the airflow in the smoke pipe 4.

[0029] Preferably, the driving mechanism 6 is configured to drive the folding air guide plate 5 to fold when the baffle door 2 is closed, and to drive the folding air guide plate 5 to extend when the baffle door 2 is opened. In one implementation of this embodiment, the folding air guide plate 5 is a double folding air guide plate 5, and its structure is as follows:

[0030] See also Figure 2 As shown, the double folding wind guide plate 5 is composed of a first wind guide plate 501, a second wind guide plate 502, a first "L"-shaped support 503, a second "L"-shaped support 504, a first connecting member 505, a second connecting member 506, a third connecting member 507 and a connecting rod 508.

[0031] See also Figure 3As shown, the first "L"-shaped support 503 and the second "L"-shaped support 504 are connected to the windward side of the baffle door 2 and are arranged at an angle, wherein the first "L"-shaped support 503 is arranged on the side of the windward side of the baffle door 2 close to its hinge, and the second "L"-shaped support 504 is arranged on the side of the windward side of the baffle door 2 close to its free end, and the driving mechanism 6 is arranged on the outer side of the first "L"-shaped support 503 and is parallel to the first "L"-shaped support 503.

[0032] The first air guide plate 501 is arranged between the first "L"-shaped support 503 and the second "L"-shaped support 504, and is thus also arranged at an angle; the upper and lower ends of the first side of the first air guide plate 501 are respectively provided with first rotating shafts 5011, and the first rotating shafts 5011 can be optionally arranged to pass through the upper and lower ends of the first side of the first air guide plate 501, or can be arranged on the upper and lower end surfaces of the first side of the first air guide plate 501; the first air guide plate 501 is rotatably connected to the first "L"-shaped support 503 and the second "L"-shaped support 504 respectively through the first rotating shaft 5011; it should be noted that the parameter settings of the first air guide plate 501 and the second air guide plate 502 need to ensure that after the first air guide plate 501 and the second air guide plate 502 are folded, they are located on the inner side of the baffle door 2 as a whole to avoid the inability to close the baffle door 2 normally.

[0033] See also Figure 4 As shown, the upper and lower ends of the second side of the first air guide plate 501 are respectively provided with a second rotating shaft 5012, the upper and lower ends of the first side of the second air guide plate 502 are respectively provided with a third rotating shaft 5021, the second connecting member 506 is rotatably connected to the second rotating shaft 5012 at the lower end of the first air guide plate 501 and the third rotating shaft 5021 at the lower end of the second air guide plate 502, the first connecting member 505 is "L"-shaped, the first connecting member 505 is rotatably connected to the second rotating shaft 5012 at the upper end of the first air guide plate 501 and the third rotating shaft 5021 at the upper end of the second air guide plate 502, and the free end of the first connecting member 505 is rotatably connected to the first end of the connecting rod 508, the connecting rod 508 8 is parallel to the first air guide plate 501, the second end of the connecting rod 508 is rotatably connected to the outer side of the first "L"-shaped support 503, the second rotating shaft 5012 is sleeved with a first gear 5013, the third rotating shaft 5021 is sleeved with a second gear 5022, the first gear 5013 is meshed with the second gear 5022; the third connecting member 507 is arranged on the outer side of the first "L"-shaped support 503 and is parallel to the first "L"-shaped support 503, the first end of the third connecting member 507 is fixedly connected to the first rotating shaft 5011 at the upper end of the first air guide plate 501, and the second end of the third connecting member 507 is rotatably connected to the output shaft of the driving mechanism 6.

[0034] In addition, in order to meet the movement space of the driving mechanism 6 when the air guide mechanism is folded, the present embodiment further provides an outer shell 7 on the outside of the bend where the smoke duct 4 turns, and the outer shell 7 is connected to the inside of the smoke duct 4. When the air guide mechanism is closed and folded by the baffle door 2, the driving mechanism 6 is located inside the outer shell 7.

[0035] The folding / stretching principle of the folding air guide plate 5 is described below:

[0036] The folding principle is as follows:

[0037] The output shaft of the driving mechanism 6 moves in the first direction, driving the second end of the third connecting member 507 to rotate counterclockwise along its output shaft, and the first end of the third connecting member 507 drives the first side of the first air guide plate 501 to rotate counterclockwise along the first rotating shaft 5011, and the second end of the connecting rod 508 synchronously rotates counterclockwise along the outer side of the first "L"-shaped support 503. During the rotation process, the first end of the connecting rod 508 pushes the free end of the first connecting member 505 to rotate clockwise along the second rotating shaft 5012, and then, when the first gear 5013 and the second gear 5022 are engaged, the first side of the second air guide plate 502 is driven to rotate clockwise along the third rotating shaft 5021 while rotating synchronously, and gradually fit to the surface of the first air guide plate 501. When the output shaft of the driving mechanism 6 moves to the limited value, the first air guide plate 501 completes the fit with the windward surface of the baffle door 2, and the second air guide plate 502 completes the fit with the first air guide plate 501, completing the folding of the air guide mechanism.

[0038] The stretching principle is as follows:

[0039] The output shaft of the driving mechanism 6 moves in the second direction, driving the second end of the third connecting member 507 to rotate clockwise along its output shaft, and the first end of the third connecting member 507 drives the first side of the first air guide plate 501 to rotate clockwise along the first rotating shaft 5011, and the second end of the connecting rod 508 synchronously rotates clockwise along the outer side of the first "L"-shaped support 503. During the rotation process, the first end of the connecting rod 508 pushes the free end of the first connecting member 505 to rotate counterclockwise along the second rotating shaft 5012, and then, when the first gear 5013 and the second gear 5022 are engaged, the first side of the second air guide plate 502 is driven to rotate counterclockwise along the third rotating shaft 5021 while rotating synchronously, gradually expanding the angle with the first air guide plate 501, and when the output shaft of the driving mechanism 6 moves to the limited value, the first air guide plate 501 completes the expansion with the windward surface of the baffle door 2, and the second air guide plate 502 completes the expansion with the first air guide plate 501, completing the extension of the air guide mechanism.

[0040] Furthermore, the first wind deflector 501 and the second wind shield are both composed of a frame and a bottom plate, the frame is made of angle iron welding, the bottom plate is arranged inside the frame, and the bottom plate is a steel plate greater than or equal to 2 mm. A baffle door switch handle is provided on the outside of the sludge box 1, and the baffle door switch handle is transmission-connected to the hinged end of the baffle door 2.

[0041] Example 2

[0042] The embodiment of the utility model also provides a slag removal device for an aluminum electrolysis fume purification system, comprising an air guide mechanism as described in Example 1.

[0043] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may be subject to various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An air guide mechanism for a slag removal device of an aluminum electrolysis flue gas purification system, the slag removal device comprising a slag box (1), a baffle door (2), a baffle switch and an inspection door (3), the slag box (1) being arranged on the outer side of a bend where a smoke pipe (4) turns, the baffle door (2) being hinged on a side of the slag box (1) close to the smoke pipe (4) and being configured to open and close into the slag box (1), the baffle door (2) being provided with an air pressure balance hole, the inspection door (3) being arranged on a side of the slag box (1) away from the smoke pipe (4), characterized in that: A folding wind guide plate (5) and a driving mechanism (6) for driving the folding wind guide plate (5) to fold / extend are provided on the windward side of the baffle door (2); when the folding wind guide plate (5) is extended, the folding wind guide plate (5) is arranged to be inclined upward in the direction of the smoke pipe (4).

2. The air guide mechanism of the slag removal device of the aluminum electrolysis fume purification system according to claim 1, characterized in that: The driving mechanism (6) is configured to drive the folding wind deflector (5) to fold when the baffle door (2) is closed, and to drive the folding wind deflector (5) to extend when the baffle door (2) is opened.

3. The air guide mechanism of the slag removal device of the aluminum electrolysis fume purification system according to claim 1, characterized in that: The folding wind guide plate (5) is a double folding wind guide plate (5).

4. The air guide mechanism of the slag removal device of the aluminum electrolysis fume purification system according to claim 3, characterized in that: The double-folding wind guide plate (5) is composed of a first wind guide plate (501), a second wind guide plate (502), a first "L"-shaped support (503), a second "L"-shaped support (504), a first connecting member (505), a second connecting member (506), a third connecting member (507) and a connecting rod (508); The first "L"-shaped support (503) and the second "L"-shaped support (504) are connected to the windward surface of the baffle door (2) and are arranged in an inclined manner, wherein the first "L"-shaped support (503) is arranged on the side of the windward surface of the baffle door (2) close to its hinge, and the second "L"-shaped support (504) is arranged on the side of the windward surface of the baffle door (2) close to its free end, and the driving mechanism (6) is arranged on the outer side of the first "L"-shaped support (503) and is parallel to the first "L"-shaped support (503); The first air guide plate (501) is arranged between the first "L"-shaped support (503) and the second "L"-shaped support (504); the first air guide plate (501) is provided with first rotating shafts (5011) at the upper and lower ends of the first side of the first air guide plate (501), and the first air guide plate (501) is rotatably connected to the first "L"-shaped support (503) and the second "L"-shaped support (504) via the first rotating shafts (5011); The upper and lower ends of the second side of the first air guide plate (501) are respectively provided with a second rotating shaft (5012); the upper and lower ends of the first side of the second air guide plate (502) are respectively provided with a third rotating shaft (5021); the second connecting member (506) is rotatably connected to the second rotating shaft (5012) at the lower end of the first air guide plate (501) and the third rotating shaft (5021) at the lower end of the second air guide plate (502); the first connecting member (505) is "L"-shaped; the first connecting member (505) is respectively connected to the second rotating shaft (5012) at the upper end of the first air guide plate (501) and the third rotating shaft (5021) at the lower end of the second air guide plate (502). 2) and a third rotating shaft (5021) at the upper end of the second air guide plate (502) is rotatably connected, and its free end is rotatably connected to the first end of the connecting rod (508), the connecting rod (508) is parallel to the first air guide plate (501), the second end of the connecting rod (508) is rotatably connected to the outer side of the first "L"-shaped support (503), the second rotating shaft (5012) is sleeved with a first gear (5013), the third rotating shaft (5021) is sleeved with a second gear (5022), and the first gear (5013) is meshed with the second gear (5022); The third connecting member (507) is arranged on the outside of the first "L"-shaped support (503) and is parallel to the first "L"-shaped support (503); the first end of the third connecting member (507) is fixedly connected to the first rotating shaft (5011) at the upper end of the first air guide plate (501); and the second end of the third connecting member (507) is rotationally connected to the output shaft of the driving mechanism (6).

5. The air guide mechanism of the slag removal device of the aluminum electrolysis fume purification system according to claim 4, characterized in that: The first wind guide plate (501) and the second wind shield plate are both composed of a frame and a bottom plate. The frame is made by welding angle irons. The bottom plate is arranged inside the frame. The bottom plate is a steel plate with a thickness greater than or equal to 2 mm.

6. The air guide mechanism of the slag removal device of the aluminum electrolysis fume purification system according to claim 5, characterized in that: A baffle door switch handle is provided on the outside of the sludge box (1), and the baffle door switch handle is drivingly connected to the hinged end of the baffle door (2).

7. A slag removal device for an aluminum electrolysis fume purification system, characterized in that: It comprises the air guiding mechanism as described in any one of claims 1 to 6.

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