Electrolytic tank smoke exhaust device and electrolytic tank production line

Abstract

The invention provides an electrolytic bath smoke exhaust device and an electrolytic bath production line, and relates to the technical field of electrolytic aluminum, the electrolytic bath smoke exhaust device comprises a smoke collecting pipe, a smoke exhaust pipe and a plurality of smoke exhaust hoods, the smoke exhaust pipe comprises a plurality of straight smoke pipes and a plurality of bent smoke pipes, the straight smoke pipes extend in the smoke exhaust direction, and the bent smoke pipes extend in the smoke exhaust direction; the cross sectional area of the straight smoke pipe is increased along the smoke discharging direction; the multiple smoke exhaust hoods are arranged at intervals in the smoke exhaust direction and divided into a first smoke exhaust hood located at the head end in the smoke exhaust direction and a plurality of second smoke exhaust hoods, the multiple bent smoke pipes are divided into a plurality of first bent smoke pipes and a plurality of second bent smoke pipes, and the head ends of the multiple straight smoke pipes are connected to the first smoke exhaust hoods through the first bent smoke pipes correspondingly. The tail ends of the multiple straight smoke pipes are connected to the smoke collecting pipe, the multiple second smoke exhaust hoods are connected to one of the straight smoke pipes through at least one second bent smoke pipe in the smoke exhaust direction, and every two adjacent second smoke exhaust hoods are connected to the different straight smoke pipes. Therefore, the smoke exhaust effect is improved.

Description

Technical Field

[0001] This invention relates to the field of electrolytic aluminum technology, and more specifically, to an electrolytic cell exhaust device and an electrolytic cell production line. Background Technology

[0002] Electrolytic cells generate a large amount of high-temperature flue gas during the production of molten aluminum. In order to prevent the high-temperature flue gas from being directly emitted into the atmosphere and polluting the environment, it is usually discharged into a flue gas purification system through the exhaust pipe at the top of the electrolytic cell for purification.

[0003] However, existing exhaust pipes above the aluminum outlet of the electrolytic cell are usually arranged in two layers. The lower exhaust pipe is closer to the aluminum outlet of the electrolytic cell, and the connection between the lower and upper exhaust pipes is at a right angle. This increases the resistance to exhaust and reduces the wind speed. The reduced wind speed makes it easier for dust in the flue gas to settle. After the electrolytic cell has been used for a period of time, it becomes increasingly difficult to exhaust the flue gas at the aluminum outlet. As a result, some high-temperature flue gas is discharged into the atmosphere without organization through gaps such as the upper part of the electrolytic cell and the side cover plate. This not only pollutes the environment of the electrolysis workshop, but also endangers the physical and mental health of the personnel. Moreover, because there is a right angle in the exhaust pipe above the cell, the effect of using high-pressure airflow to clean the dust inside the exhaust pipe is not good. Summary of the Invention

[0004] The problem this invention addresses is how to improve the smoke extraction and dust removal efficiency of the electrolytic cell exhaust device.

[0005] To address the above problems, the present invention provides an electrolytic cell exhaust device and an electrolytic cell production line.

[0006] In a first aspect, the present invention provides an electrolytic cell exhaust device, comprising a smoke collection pipe, an exhaust pipe, and multiple exhaust hoods; The exhaust pipe includes multiple straight exhaust pipes and multiple curved exhaust pipes. The multiple straight exhaust pipes extend along the exhaust direction, and the cross-sectional area of ​​the straight exhaust pipes increases along the exhaust direction. The multiple straight exhaust pipes are spaced apart in a direction perpendicular to the exhaust direction and parallel to the horizontal plane. The plurality of exhaust hoods are spaced apart along the exhaust direction and divided into a first exhaust hood and a plurality of second exhaust hoods. The first exhaust hood is located at the beginning of the exhaust direction. The plurality of curved smoke pipes are divided into a plurality of first curved smoke pipes and a plurality of second curved smoke pipes. The beginnings of the plurality of straight smoke pipes are respectively connected to the first exhaust hood through a first curved smoke pipe, and the tails of the plurality of straight smoke pipes are respectively connected to the smoke collection pipe. Along the exhaust direction, the plurality of second exhaust hoods are respectively connected to one of the straight smoke pipes through at least one second curved smoke pipe, and two adjacent second exhaust hoods are connected to different straight smoke pipes.

[0007] Optionally, the straight flue includes at least one straight pipe and at least one reducing pipe, the cross-sectional area of ​​the reducing pipe continuously increases along the exhaust direction, and the straight pipe and the reducing pipe are alternately and detachably connected.

[0008] Optionally, adjacent straight pipes and variable pipes can be detachably connected by flexible connectors.

[0009] Optionally, the end of the first curved smoke pipe away from the first smoke hood is connected to the smaller end of the reducing pipe.

[0010] Optionally, the exhaust pipe further includes a plurality of third-bend exhaust pipes, which are arranged one-to-one with a plurality of straight exhaust pipes, and the tail ends of the plurality of straight exhaust pipes are respectively connected to the smoke collection pipe through the corresponding third-bend exhaust pipe.

[0011] Optionally, the electrolytic cell exhaust device further includes multiple air blowing components, with each straight smoke pipe corresponding to at least one air blowing component; each air blowing component includes an air blowing pipe and a one-way valve, one end of the air blowing pipe is connected to the corresponding straight smoke pipe, and the other end is used to connect to the exhaust port of the shell-breaking cylinder, and the one-way valve is provided on the air blowing pipe to restrict the flow of flue gas in the straight smoke pipe to the shell-breaking cylinder.

[0012] Optionally, the air blowing pipe includes a first connecting pipe and a second connecting pipe connected through the one-way valve. The one-way valve is fixed to the top of the straight smoke pipe. The first connecting pipe is located inside the straight smoke pipe, and the second connecting pipe is located outside the straight smoke pipe and is used to connect to the exhaust port of the shell-breaking cylinder.

[0013] Optionally, the first connecting pipe is inclined relative to the smoke exhaust direction, and the end of the first connecting pipe away from the one-way valve is located on the side of the one-way valve closer to the smoke collection pipe.

[0014] Optionally, the plurality of air blowing assemblies are divided into a plurality of first air blowing assemblies and a plurality of second air blowing assemblies. Each straight smoke pipe corresponds to one first air blowing assembly and at least one second air blowing assembly. The air blowing pipe of the first air blowing assembly is connected to the beginning end of the straight smoke pipe, and the air blowing pipe of the second air blowing assembly is connected to the middle part of the straight smoke pipe and located at the connection between the straight smoke pipe and the second curved smoke pipe.

[0015] Secondly, the present invention provides an electrolytic cell production line, including the electrolytic cell exhaust device described above.

[0016] The beneficial effects of the electrolytic cell exhaust device of the present invention are as follows: By configuring the exhaust pipe to include multiple straight exhaust pipes and multiple curved exhaust pipes, the exhaust efficiency of the device can be improved by utilizing multiple straight exhaust pipes spaced apart in a direction perpendicular to the exhaust direction and parallel to the horizontal plane. Simultaneously, by dividing the multiple curved exhaust pipes into multiple first curved exhaust pipes and multiple second curved exhaust pipes located at their initial ends in the exhaust direction, and dividing the multiple exhaust hoods into a first exhaust hood and multiple second exhaust hoods, and connecting the initial ends of the multiple straight exhaust pipes to the first exhaust hood via the first curved exhaust pipes, the efficiency can be improved by utilizing the exhaust pipes near the aluminum outlet end of the electrolytic cell. The first exhaust hood captures the large amount of flue gas generated during the electrolytic aluminum production process and during aluminum tapping, and diverts it to the collection pipe through multiple straight smoke pipes. This allows the flue gas to flow quickly to the collection pipe for collection, thereby improving the efficiency and effectiveness of flue gas extraction during the electrolytic aluminum production process. At the same time, the tail ends of the multiple straight smoke pipes are connected to the collection pipe, and the second exhaust hood is connected to the straight smoke pipes through a second curved smoke pipe. This creates a relatively smooth curved transition connection between the exhaust hood and the straight smoke pipes, avoiding right-angle bends at the connection point. This reduces the resistance of the flue gas flowing from the exhaust hood to the exhaust pipe, improving the flue gas extraction effect. Furthermore, in the exhaust direction, multiple second exhaust hoods are connected to one of the straight exhaust pipes via at least one second curved exhaust pipe, and adjacent second exhaust hoods are connected to different straight exhaust pipes. This means that multiple second exhaust hoods are alternately connected to multiple straight exhaust pipes via multiple second curved exhaust pipes. This ensures that the flue gas in each second exhaust hood can be transported to the collection pipe through the straight exhaust pipe, and that the flue gas inlets (openings on the straight exhaust pipes for connection with the curved exhaust pipes) in the multiple straight exhaust pipes are evenly distributed, improving the efficiency of flue gas emission. Additionally, the multiple exhaust hoods provide relatively uniform support to the exhaust pipe near the aluminum outlet of the electrolytic cell, thus ensuring the exhaust pipe is under balanced stress. Moreover, by setting the straight exhaust pipe to extend along the exhaust direction, the main body of the exhaust pipe has a horizontal flue structure extending along the exhaust direction. This not only reduces the length of the exhaust pipe but also reduces the resistance to flue gas flow within the pipe (i.e., exhaust resistance), lowering the probability of fugitive emissions and further improving the exhaust effect. It also improves the cleaning effect of dust accumulation inside the exhaust pipe. Furthermore, by designing the cross-sectional area of ​​the straight flue to be increased along the exhaust direction, the exhaust resistance can be further reduced, and the volume of the exhaust pipe can be increased, allowing the exhaust pipe to collect more smoke, thereby improving the exhaust capacity of the exhaust pipe and thus improving the exhaust effect. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the electrolytic cell exhaust device in an embodiment of the present invention; Figure 2 This is a schematic diagram of the electrolytic cell exhaust device from another perspective in an embodiment of the present invention; Figure 3This is a schematic diagram of the structure of the electrolytic cell exhaust device from another perspective in an embodiment of the present invention; Figure 4 This is a schematic diagram of another embodiment of the electrolytic cell exhaust device in this invention. Figure 5 for Figure 4 Enlarged view of a portion of point A in the middle.

[0018] Explanation of reference numerals in the attached figures: 1. Smoke collecting pipe; 2. Smoke exhaust pipe; 21. Straight smoke pipe; 211. Straight pipe; 212. Reducing pipe; 22. Bent smoke pipe; 221. First bent smoke pipe; 222. Second bent smoke pipe; 23. Third bent smoke pipe; 3. Smoke exhaust hood; 31. First smoke exhaust hood; 32. Second smoke exhaust hood; 4. Air blowing assembly; 41. Air blowing pipe; 411. First connecting pipe; 412. Second connecting pipe; 42. One-way valve; 500. Shell-opening cylinder. Detailed Implementation

[0019] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Although some embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the present invention. It should be understood that the accompanying drawings and embodiments of the present invention are for illustrative purposes only and are not intended to limit the scope of protection of the present invention.

[0020] In the attached figures, the X-axis represents the front-to-back position, with the positive direction of the X-axis representing the front and the negative direction representing the rear. The Y-axis represents the left-to-right position, with the positive direction representing the left and the negative direction representing the right. The Z-axis represents the up-down position, with the positive direction representing the top and the negative direction representing the bottom. It should be noted that the aforementioned representations of the X, Y, and Z axes are for ease of description and simplification of the invention, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention.

[0021] The term "comprising" and its variations as used herein are open-ended, meaning "including but not limited to"; the term "based on" means "at least partially based on"; the term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments"; and the term "optionally" means "optional embodiments". Definitions of other terms will be given in the following description. It should be noted that the concepts of "first," "second," etc., mentioned in this invention are used only to distinguish different devices, modules, or units, and are not intended to limit the order of functions performed by these devices, modules, or units or their interdependencies.

[0022] It should be noted that the terms "a" and "a plurality of" used in this invention are illustrative rather than restrictive. Those skilled in the art should understand that, unless otherwise expressly indicated in the context, they should be understood as "one or more".

[0023] In related technologies, the exhaust pipes above the aluminum outlet of the electrolytic cell are usually arranged in two layers. The lower exhaust pipe is closer to the aluminum outlet of the electrolytic cell, and the connection between the lower and upper exhaust pipes is at a right angle. This increases the resistance to exhaust and reduces the wind speed. The reduced wind speed makes it easier for dust in the flue gas to settle. As a result, after the electrolytic cell has been used for a period of time, it becomes increasingly difficult to exhaust the flue gas at the aluminum outlet. Consequently, some high-temperature flue gas is discharged into the atmosphere without organization through gaps such as the upper part of the electrolytic cell and the side cover plate. This not only pollutes the environment of the electrolysis workshop, but also endangers the physical and mental health of the personnel.

[0024] To address the problems existing in the aforementioned related technologies, embodiments of the present invention provide an electrolytic cell exhaust device and an electrolytic cell production line.

[0025] Combination Figure 1 and Figure 2 As shown, an electrolytic cell exhaust device according to an embodiment of the present invention includes a smoke collection pipe 1, an exhaust pipe 2, and multiple exhaust hoods 3; the exhaust pipe 2 includes multiple straight smoke pipes 21 and multiple bent smoke pipes 22, the multiple straight smoke pipes 21 are respectively extended along the exhaust direction, and the cross-sectional area of ​​the straight smoke pipes 21 increases along the exhaust direction, and the multiple straight smoke pipes 21 are spaced apart in a direction perpendicular to the exhaust direction and parallel to the horizontal plane; Multiple smoke hoods 3 are spaced apart along the smoke exhaust direction and divided into a first smoke hood 31 and multiple second smoke hoods 32. The first smoke hood 31 is located at the beginning of the smoke exhaust direction. Multiple curved smoke pipes 22 are divided into multiple first curved smoke pipes 221 and multiple second curved smoke pipes 222. The beginnings of multiple straight smoke pipes 21 are respectively connected to the first smoke hood 31 through a first curved smoke pipe 221, and the tails of multiple straight smoke pipes 21 are respectively connected to the smoke collection pipe 1. Along the smoke exhaust direction, multiple second smoke hoods 32 are respectively connected to one of the straight smoke pipes 21 through at least one second curved smoke pipe 222, and two adjacent second smoke hoods 32 are connected to different straight smoke pipes 21.

[0026] It should be noted that the electrolytic cell exhaust device in this embodiment is installed on the upper part of an electrolytic cell, for example, with a rated current of 600KA, forming an upper exhaust device for the electrolytic cell. The exhaust pipe 2 of the electrolytic cell exhaust device extends from the aluminum outlet end of the electrolytic cell to the flue end, while multiple exhaust hoods 3 are typically arranged close to the aluminum outlet end of the electrolytic cell. The aluminum outlet end of the electrolytic cell refers to the end where aluminum is discharged, and the flue end refers to the end of the electrolytic cell away from the aluminum outlet end; since this end is close to the flue gas purification system, it is also called the flue end. The exhaust pipe 2 of the electrolytic cell exhaust device discharges the flue gas generated during the electrolytic aluminum production process from the aluminum outlet end of the electrolytic cell towards the flue end. Therefore, the exhaust direction is from the aluminum outlet end of the electrolytic cell to the flue end. Figure 1 The opposite direction of the Y-axis, referred to as the right direction, is where exhaust pipe 2 is located. Figure 1 The exhaust direction is from left to right. Correspondingly, the direction perpendicular to the exhaust direction and parallel to the horizontal plane is... Figure 1 The X-axis direction is also the front-to-back direction of the electrolytic cell.

[0027] Specifically, in the electrolytic cell exhaust system, the exhaust hood 3, exhaust pipe 2, and smoke collecting pipe 1 are sequentially connected and form a negative pressure inside. The smoke collecting pipe 1 is usually located near the flue end of the electrolytic cell and is used to connect to the flue gas purification system. The exhaust pipe 2 extends from the aluminum outlet end of the electrolytic cell to the flue end. The lower end of the exhaust hood 3 is fixed to the top of the electrolytic cell and connects to the exhaust port at the top of the electrolytic cell. This allows the flue gas generated during the production of electrolytic aluminum to be drawn into the exhaust hood 3 from the exhaust port and then sequentially sent to the flue gas purification system via the exhaust hood 3, exhaust pipe 2, and smoke collecting pipe 1 for purification, reducing the fluorine content in the flue gas. Moreover, there are multiple exhaust hoods 3, each connected to multiple exhaust ports opened at the top of the electrolytic cell. The arrangement direction of the multiple exhaust hoods 3 is usually the same as the arrangement direction of the multiple exhaust ports at the top of the electrolytic cell, i.e., they are all spaced apart along the exhaust direction.

[0028] More specifically, the exhaust pipe 2 includes multiple straight exhaust pipes 21 and multiple curved exhaust pipes 22. A curved exhaust pipe 22 is a pipe that is smoothly curved in an arc shape with an obtuse angle, without any bends or turns. The multiple straight exhaust pipes 21 are arranged along the front-to-back direction of the electrolytic cell, with each straight exhaust pipe 21 arranged horizontally along the exhaust direction. The multiple curved exhaust pipes 22 are divided into multiple first curved exhaust pipes 221 and multiple second curved exhaust pipes 222. The multiple exhaust hoods 3 are divided into one first exhaust hood 31 and multiple second exhaust hoods 32. The first curved exhaust pipe 221 is located at the beginning of the exhaust direction and corresponds one-to-one with the straight exhaust pipe 21. The second curved smoke pipe 22 and the second smoke hood 32 can be configured in a one-to-one correspondence or a many-to-one correspondence. That is, the number of first curved smoke pipes 221 is the same as the number of straight smoke pipes 21, and the number of second curved smoke pipes 22 and the number of second smoke hoods 32 can be the same or different. Furthermore, the beginnings of the multiple straight smoke pipes 21 are connected to the first smoke hood 31 via corresponding first curved smoke pipes 221, and the end ends of the multiple straight smoke pipes 21 are connected to the smoke collection pipe 1. The multiple second smoke hoods 32 are each connected to one of the straight smoke pipes 21 via at least one second curved smoke pipe 222. For example... Figure 1The document provides an example of each second smoke hood 32 being connected to a corresponding straight smoke pipe 21 via a second curved smoke pipe 22. Simultaneously, two adjacent second smoke hoods 32 are connected to different straight smoke pipes 21, meaning multiple second smoke hoods 32 are alternately connected to multiple straight smoke pipes 21 via corresponding second curved smoke pipes 222. For example, if there are two straight smoke pipes 21 and three second smoke hoods 32, the three second smoke hoods 32 can be connected to the first straight smoke pipe 21, the second straight smoke pipe 21, and the first straight smoke pipe 21, respectively, or to the second straight smoke pipe 21, the first straight smoke pipe 21, and the second straight smoke pipe 21, respectively. Furthermore, the cross-sectional area of ​​each straight smoke pipe 21 increases along the smoke exhaust direction. This can be understood as the pipe of the straight smoke pipe 21 becoming wider, not that the inner wall of the straight smoke pipe 21 becoming thicker. The cross-sectional area of ​​the straight smoke pipe 21 can increase continuously or discontinuously along the smoke exhaust direction. When the cross-sectional area of ​​the straight flue 21 increases continuously along the exhaust direction, the entire straight flue 21 has a trumpet-shaped variable diameter pipe structure. When the cross-sectional area of ​​the straight flue 21 increases discontinuously along the exhaust direction, the cross-sectional area of ​​the straight flue 21 generally increases along the exhaust direction, but there are parts with a constant cross-sectional area; for example, the straight flue 21 can be formed by alternating connections of multiple straight pipe sections with different cross-sectional areas and multiple variable diameter pipe sections with different cross-sectional areas. The multiple straight pipe sections are arranged in order of increasing cross-sectional area along the exhaust direction, and the multiple variable diameter pipe sections are also arranged in order of increasing cross-sectional area along the exhaust direction. Moreover, in two variable diameter pipe sections connected to the same straight pipe section, the cross-sectional area of ​​the smaller end of one variable diameter pipe section is greater than that of the other. Another variable diameter pipe section has a large end cross-sectional area. In this case, the cross-sectional area of ​​the straight flue pipe 21 at the straight pipe section remains unchanged, but the cross-sectional area at the variable diameter pipe section continuously increases along the exhaust direction. For example, the straight flue pipe 21 can be composed of multiple straight pipe sections with different cross-sectional areas. The multiple straight pipe sections are connected in sequence along the exhaust direction according to the cross-sectional area from small to large, and the central axes of the multiple straight pipe sections coincide. In this case, the cross-sectional area of ​​the straight flue pipe 21 at the straight pipe section remains unchanged, but the cross-sectional area at the connection of two straight pipe sections with different cross-sectional areas suddenly increases. That is, the straight flue pipe 21 has a stepped structure as a whole.

[0029] In this embodiment, the exhaust pipe 2 can be configured to include multiple straight exhaust pipes 21 and multiple curved exhaust pipes 22, so as to improve the exhaust efficiency of the exhaust device by using multiple straight exhaust pipes 21 spaced apart in a direction perpendicular to the exhaust direction and parallel to the horizontal plane; at the same time, by dividing the multiple curved exhaust pipes 22 into multiple first curved exhaust pipes 221 and multiple second curved exhaust pipes 222, the multiple exhaust hoods 3 are divided into a first exhaust hood 31 located at the beginning of the exhaust direction and multiple second exhaust hoods 32, and the beginnings of the multiple straight exhaust pipes 21 are respectively connected to the first exhaust hood 31 through the first curved exhaust pipes 221, so as to utilize the first exhaust near the aluminum outlet end of the electrolytic cell. The hood 31 captures a large amount of flue gas generated during the production of electrolytic aluminum and during aluminum tapping, and diverts it to the collection pipe 1 through multiple straight smoke pipes 21, allowing the flue gas to flow quickly to the collection pipe 1 for collection, thereby improving the efficiency and effect of flue gas exhaust during the electrolytic aluminum production process. At the same time, the tail ends of the multiple straight smoke pipes 21 are connected to the collection pipe 1 respectively, and the second exhaust hood 32 is connected to the straight smoke pipes 21 through the second bent smoke pipe 222, so that the exhaust hood 3 and the straight smoke pipes 21 form a relatively smooth curved transition connection through the bent smoke pipe 22, avoiding right-angle corners at the connection, thereby reducing the resistance of flue gas flowing from the exhaust hood 3 to the exhaust pipe 2 and improving the exhaust effect. In addition, in the exhaust direction, multiple second exhaust hoods 32 are connected to one of the straight exhaust pipes 21 through at least one second curved exhaust pipe 222, and two adjacent second exhaust hoods 32 are connected to different straight exhaust pipes 21. That is, multiple second exhaust hoods 32 are alternately connected to multiple straight exhaust pipes 21 through multiple second curved exhaust pipes 222. This allows the flue gas in each second exhaust hood 32 to be transported to the smoke collection pipe 1 through the straight exhaust pipe 21, and also allows the flue gas inlets (i.e., the openings on the straight exhaust pipe 21 for connecting with the curved exhaust pipe 22) in the multiple straight exhaust pipes 21 to be evenly distributed, improving the efficiency of flue gas emission. In addition, it also allows the multiple exhaust hoods 3 to provide a more uniform support force to the part of the exhaust pipe 2 near the aluminum outlet of the electrolytic cell, thereby ensuring the force balance of the exhaust pipe 2. Furthermore, by setting the straight flue 21 to extend along the exhaust direction, the main body of the exhaust pipe 2 forms a horizontal flue structure extending along the exhaust direction. This not only reduces the length of the flue but also reduces the resistance to flue gas flow within the flue (i.e., exhaust resistance), lowering the probability of fugitive emissions and further improving the exhaust efficiency. It also enhances the cleaning of dust accumulation within the flue. Moreover, by designing the cross-sectional area of ​​the straight flue 21 to be increased along the exhaust direction, the exhaust resistance is further reduced, and the volume of the exhaust pipe 2 is increased, allowing it to collect more flue gas and thus improving its exhaust capacity and overall exhaust efficiency.

[0030] Furthermore, combined Figure 1As shown, there are two straight smoke pipes 21, which are respectively installed at the front and rear ends of the electrolytic cell, and multiple exhaust hoods 3 are installed between the two straight smoke pipes 21 along the exhaust direction.

[0031] Since other structures are arranged above the electrolytic cell, the upper space of the electrolytic cell is limited. Therefore, in this embodiment, two straight smoke pipes 21 are set and the two straight smoke pipes 21 are respectively set at the front and rear ends of the electrolytic cell to improve the smoke exhaust efficiency while reducing the space occupied above the electrolytic cell. At the same time, multiple smoke exhaust hoods 3 are set between the two straight smoke pipes 21 along the smoke exhaust direction to reduce the space occupied by the electrolytic cell smoke exhaust device.

[0032] Optionally, combined Figure 2 and Figure 3 As shown, the straight flue duct 21 includes at least one straight pipe 211 and at least one reducing pipe 212. The cross-sectional area of ​​the reducing pipe 212 increases continuously along the flue direction, and the straight pipe 211 and the reducing pipe 212 are alternately and detachably connected.

[0033] In this optional embodiment, the cross-sectional area of ​​the straight pipe 211 remains unchanged along the smoke exhaust direction, and the reducing pipe 212 has a trumpet-shaped structure with a large end and a small end; moreover, among the two straight pipes 211 respectively connected to the same reducing pipe 212, the cross-sectional area of ​​the straight pipe 211 connected to the small end of the reducing pipe 212 is smaller than the cross-sectional area of ​​the straight pipe 211 connected to the large end of the reducing pipe 212; among the two reducing pipes 212 respectively connected to the same straight pipe 211, the cross-sectional area of ​​the large end of the reducing pipe 212 connected to the end of the straight pipe 211 away from the smoke collecting pipe 1 is smaller than the cross-sectional area of ​​the small end of the reducing pipe 212 connected to the end of the straight pipe 211 close to the smoke collecting pipe 1. In this way, by designing the straight flue pipe 21 as being alternately and detachably connected by at least one straight pipe 211 and at least one flared variable diameter pipe 212, the straight flue pipe 21 is composed of multiple flue pipe sections, which facilitates disassembly and cleaning of dust inside the pipe. At the same time, the cross-sectional area of ​​the straight flue pipe 21 increases discontinuously along the exhaust direction, which not only reduces the production cost and weight of the straight flue pipe 21, but also reduces the volume of the straight flue pipe 21, making it easier to arrange in the limited space above the electrolytic cell.

[0034] Optionally, adjacent straight pipes 211 and reducing pipes 212 can be detachably connected via flexible connectors. This not only facilitates the disassembly of sections of the straight flue pipe 21 to clean accumulated ash, but also allows for the removal of sections of the flue pipe near the elevator when replacing the elevator above the electrolytic cell. This provides more operating space for elevator replacement, reducing the difficulty of replacement and improving efficiency. The flexible connector can possess high-temperature resistance, fire resistance, and shock absorption properties, such as silicone rubber-coated fiberglass cloth, metal corrugated pipe, or ceramic fiber cloth, to extend its service life.

[0035] Optionally, combined Figure 3 As shown, the cross-sectional area of ​​the straight pipe 211 connected to the smaller end of the reducing pipe 212 is equal to the cross-sectional area of ​​the smaller end of the reducing pipe 212, and / or, the cross-sectional area of ​​the straight pipe 211 connected to the larger end of the reducing pipe 212 is equal to the cross-sectional area of ​​the larger end of the reducing pipe 212. That is to say, the opening of the smaller or larger end of the reducing pipe 212 can coincide with the opening of the corresponding straight pipe 211 near the end of the reducing pipe 212.

[0036] This makes it easy to design the connection structure, such as the connecting flange, at the small or large end of the reducing pipe 212 to be the same as the connection structure on the corresponding straight pipe 211. This not only simplifies the structure of the straight pipe 21, but also facilitates the connection between adjacent straight pipes 211 and reducing pipes 212.

[0037] Optionally, combined Figure 1 and Figure 2 As shown, the end of the first curved smoke pipe 221 that is away from the first exhaust hood 31 is connected to the small end of the reducing pipe 212.

[0038] Because the front section of the straight smoke pipe 21 (i.e. the section of the straight smoke pipe 21 near the aluminum outlet end of the electrolytic cell) is connected to a single exhaust hood 3 (i.e. the first exhaust hood 31), the amount of smoke drawn in is relatively small. However, the number of exhaust hoods 3 connected to the middle part of the straight smoke pipe 21 increases, resulting in an increase in the amount of smoke drawn in the middle part of the straight smoke pipe 21.

[0039] Therefore, in this optional embodiment, by connecting the end of the first curved smoke pipe 221 away from the first exhaust hood 31 to the small end of the reducing pipe 212, the front section of the straight smoke pipe 21 is the reducing pipe 212, while the middle section of the straight smoke pipe 21 is almost a straight pipe 211. This not only makes it easier to design a smaller pipe area (i.e., cross-sectional area) and pipe length for the front section of the straight smoke pipe 21, thus reducing material consumption and weight while ensuring that the exhaust capacity of the front section of the straight smoke pipe 21 meets the requirements, but also facilitates increasing the pipe area and pipe length of the straight pipe 211 to improve the exhaust capacity and efficiency of the middle section of the straight smoke pipe 21, ensuring that the exhaust capacity of the middle section of the straight smoke pipe 21 also meets the usage requirements. In addition, using the straight pipe 211 as the main structure of the middle section of the straight smoke pipe 21 can reduce the production difficulty of the middle section of the straight smoke pipe 21, thereby improving the production efficiency of the straight smoke pipe 21.

[0040] Optionally, combined Figure 1 and Figure 2 As shown, the exhaust pipe 2 also includes multiple third-bend exhaust pipes 23, which are arranged one-to-one with multiple straight exhaust pipes 21, and the tail ends of the multiple straight exhaust pipes 21 are respectively connected to the smoke collection pipe 1 through the corresponding third-bend exhaust pipes 23. In this way, the resistance of the flue gas flowing from the straight exhaust pipes 21 to the smoke collection pipe 1 can be reduced by using the third-bend exhaust pipes 23, thereby improving the exhaust effect.

[0041] Furthermore, the bending angles of the first bend smoke pipe 221, the second bend smoke pipe 222, and the third bend smoke pipe 23 are all obtuse angles. This makes the overall direction of the exhaust pipe 2 more gentle, thereby further reducing the resistance of the flue and improving the exhaust effect.

[0042] Optionally, combined Figure 4 As shown, the electrolytic cell exhaust device also includes multiple air blowing components 4, with each straight smoke pipe 21 corresponding to at least one air blowing component 4; each air blowing component 4 includes an air blowing pipe 41 and a one-way valve 42, one end of the air blowing pipe 41 is connected to the corresponding straight smoke pipe 21, and the other end is used to connect to the exhaust port of the shell-breaking cylinder 500, and the one-way valve 42 is provided on the air blowing pipe 41 to restrict the flow of flue gas in the straight smoke pipe 21 to the shell-breaking cylinder 500.

[0043] Specifically, each straight smoke pipe 21 can correspond to one or more air blowing assemblies 4. In practical applications, an appropriate number of air blowing assemblies 4 can be configured according to the length of the straight smoke pipe 21, for example... Figure 4The document provides an example of two air blowing assemblies 4 corresponding to each straight smoke pipe 21. The straight smoke pipe 21 typically has an air blowing port that communicates with the air blowing pipe 41. A one-way valve 42 can be located at the end of the air blowing pipe 41 furthest from the shell-breaking cylinder 500. In this case, the one-way valve 42 can be fixed to the straight smoke pipe 21 and communicate with it, allowing the air blowing pipe 41 to communicate with the straight smoke pipe 21 through the one-way valve 42. Alternatively, the one-way valve 42 can be located in the middle of the air blowing pipe 41. In this case, the end of the air blowing pipe 41 furthest from the shell-breaking cylinder 500 can extend into the straight smoke pipe 21 from the air blowing port, or it can be directly connected to the air blowing port on the straight smoke pipe 21 via a pipe connector. The appropriate option can be selected based on the specific application.

[0044] In this way, by setting up the air blowing assembly 4 and connecting the air blowing pipe 41 in the air blowing assembly 4 to the exhaust port of the shell-breaking cylinder 500, the high-pressure airflow discharged from the shell-breaking cylinder 500 can be introduced into the exhaust pipe 2 through the air blowing pipe 41 to clean the accumulated dust. Furthermore, by using the shell-breaking cylinder 500 as the high-pressure air source for cleaning the dust in the exhaust pipe, there is no need to set up an additional high-pressure air source. By setting a one-way valve 42 on the air blowing pipe 41, the flue gas in the exhaust pipe 2 can be prevented from flowing into the shell-breaking cylinder 500. In addition, the one-way valve 42 can be set outside the straight exhaust pipe 21 to avoid long-term corrosion of the one-way valve 42 by high-temperature flue gas, thereby extending the service life of the one-way valve 42. Furthermore, during the production of electrolytic aluminum, the high-pressure airflow discharged from the shell-breaking cylinder 500 can continuously blow up the dust that settles due to the reduced flow velocity after the flue gas passes through the curved flue pipe 22. This allows the rapidly flowing flue gas inside the flue pipe to carry away the dust suspended inside, thereby reducing dust accumulation. This reduces the frequency of regular dust cleaning inside the flue pipe, extends the regular cleaning cycle, and lowers maintenance costs. In addition, the high-pressure airflow discharged from the shell-breaking cylinder 500 can also accelerate the flow of flue gas inside the flue pipe, which not only improves the flue gas exhaust efficiency and effect but also reduces the probability of flue gas settling inside the flue pipe and forming dust, thereby further reducing the frequency of regular dust cleaning inside the flue pipe.

[0045] Furthermore, the air blowing assembly 4 also includes a switching valve (not shown in the figure), which is located on the air blowing pipe 41 between the one-way valve 42 and the shell-breaking cylinder 500. This allows the switching valve to be selectively opened for cleaning operations according to actual cleaning needs.

[0046] Optionally, combined Figure 4 As shown, the air blowing pipe 41 includes a first connecting pipe 411 and a second connecting pipe 412 connected by a one-way valve 42. The one-way valve 42 is fixed to the top of the straight smoke pipe 21. The first connecting pipe 411 is located inside the straight smoke pipe 21, and the second connecting pipe 412 is located outside the straight smoke pipe 21 and is used to connect to the exhaust port of the shell-breaking cylinder 500.

[0047] In this way, the second connecting pipe 412 can be connected to the exhaust port of the shell-breaking cylinder 500 to introduce the high-pressure airflow discharged by the shell-breaking cylinder 500 into the blowing pipe 41. At the same time, the first connecting pipe 411 can be used to shorten the distance between the high-pressure airflow blown out from the blowing pipe 41 and the inner bottom wall of the straight smoke pipe 21, so that the high-pressure airflow blown out from the blowing pipe 41 can get closer to the inner bottom wall of the straight smoke pipe 21, thereby better cleaning the dust settled on the inner bottom wall of the straight smoke pipe 21.

[0048] Optionally, combined Figure 4 and Figure 5 As shown, the first connecting pipe 411 is inclined relative to the smoke exhaust direction, and the end of the first connecting pipe 411 away from the one-way valve 42 is located on the side of the one-way valve 42 closer to the smoke collection pipe 1. For example, based on the smoke exhaust direction being from left to right, when the first connecting pipe 411 is inserted from the top of the straight smoke pipe 21, the first connecting pipe 411 is inclined to the lower right inside the straight smoke pipe 21; when the first connecting pipe 411 is inserted from the front or rear side of the straight smoke pipe 21, the first connecting pipe 411 is inclined to the front right or rear right inside the straight smoke pipe 21.

[0049] In this way, the high-pressure airflow blown out by the first connecting pipe 411 can blow the dust settled on the inner bottom wall of the straight smoke pipe 21 towards the smoke exhaust direction, so as to further accelerate the flow of dust with the smoke to the smoke collection pipe 1, and improve the smoke exhaust efficiency and smoke exhaust effect.

[0050] Optionally, combined Figure 4 As shown, the multiple air blowing components 4 are divided into multiple first air blowing components and multiple second air blowing components. Each straight smoke pipe 21 corresponds to one first air blowing component and at least one second air blowing component. The air blowing pipe 41 of the first air blowing component is connected to the beginning of the straight smoke pipe 21, and the air blowing pipe 41 of the second air blowing component is connected to the middle part of the straight smoke pipe 21 and is located at the connection between the straight smoke pipe 21 and the second curved smoke pipe 222.

[0051] Specifically, the air blowing pipe 41 of the first air blowing assembly is connected to the beginning of the straight smoke pipe 21, and the air blowing pipe 41 of the second air blowing assembly is connected to the portion of the straight smoke pipe 21 downstream of the second curved smoke pipe 222, that is, the air blowing pipe 41 of the second air blowing assembly is connected to the middle portion of the straight smoke pipe 21 and is located at the connection between the straight smoke pipe 21 and the second curved smoke pipe 222. In other words, in the smoke exhaust direction, the air blowing pipe 41 of the first air blowing assembly is connected to the end of the straight smoke pipe 21 after the first curved smoke pipe 221, and the air blowing pipe 41 of the second air blowing assembly is connected to the portion of the straight smoke pipe 21 after the second curved smoke pipe 222.

[0052] This allows for the use of multiple air-blowing components 4 to blow air and clean the dust at the connection between the straight smoke pipe 21 and the multiple curved smoke pipes 22, thereby further reducing dust accumulation in the smoke pipes. It also facilitates increasing the flow rate of the flue gas at the connection between the straight smoke pipe 21 and the multiple curved smoke pipes 22, thereby further improving the smoke exhaust efficiency and effect.

[0053] An electrolytic cell production line according to an embodiment of the present invention includes an electrolytic cell exhaust device as described above.

[0054] The beneficial effects of the electrolytic cell production line in this embodiment are the same as those of the electrolytic cell exhaust device described above, and will not be repeated here.

[0055] While the present invention has been disclosed above, its scope of protection is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and all such changes and modifications will fall within the scope of protection of the present invention.

Claims

1. An electrolytic cell exhaust device, characterized in that, It includes a smoke collection pipe (1), a smoke exhaust pipe (2), and multiple smoke exhaust hoods (3); The exhaust pipe (2) includes multiple straight exhaust pipes (21) and multiple curved exhaust pipes (22). The multiple straight exhaust pipes (21) are respectively extended along the exhaust direction, and the cross-sectional area of ​​the straight exhaust pipes (21) increases along the exhaust direction. The multiple straight exhaust pipes (21) are spaced apart in a direction perpendicular to the exhaust direction and parallel to the horizontal plane. Multiple smoke hoods (3) are spaced apart along the smoke exhaust direction and divided into a first smoke hood (31) and multiple second smoke hoods (32). The first smoke hood (31) is located at the beginning of the smoke exhaust direction. Multiple curved smoke pipes (22) are divided into multiple first curved smoke pipes (221) and multiple second curved smoke pipes (222). The beginnings of multiple straight smoke pipes (21) are respectively connected to the first smoke hood (31) through a first curved smoke pipe (221). The tails of multiple straight smoke pipes (21) are respectively connected to the smoke collection pipe (1). Along the smoke exhaust direction, multiple second smoke hoods (32) are respectively connected to one of the straight smoke pipes (21) through at least one second curved smoke pipe (222), and two adjacent second smoke hoods (32) are connected to different straight smoke pipes (21).

2. The electrolytic cell exhaust device according to claim 1, characterized in that, The straight smoke pipe (21) includes at least one straight pipe (211) and at least one variable diameter pipe (212), the cross-sectional area of ​​the variable diameter pipe (212) continuously increases along the smoke exhaust direction, and the straight pipe (211) and the variable diameter pipe (212) are alternately and detachably connected.

3. The electrolytic cell exhaust device according to claim 2, characterized in that, The adjacent straight pipe (211) and the variable pipe (212) are detachably connected by a flexible connector.

4. The electrolytic cell exhaust device according to claim 2, characterized in that, The end of the first curved smoke pipe (221) away from the first smoke hood (31) is connected to the small end of the variable diameter pipe (212).

5. The electrolytic cell exhaust device according to claim 1, characterized in that, The exhaust pipe (2) also includes a plurality of third-bend exhaust pipes (23), which are arranged one-to-one with a plurality of straight exhaust pipes (21), and the tail ends of the plurality of straight exhaust pipes (21) are respectively connected to the smoke collection pipe (1) through the corresponding third-bend exhaust pipes (23).

6. The electrolytic cell exhaust device according to claim 1, characterized in that, It also includes multiple air blowing assemblies (4), each of the straight smoke pipes (21) corresponds to at least one air blowing assembly (4); each of the air blowing assemblies (4) includes an air blowing pipe (41) and a one-way valve (42), one end of the air blowing pipe (41) is connected to the corresponding straight smoke pipe (21), and the other end is used to connect to the exhaust port of the shell-breaking cylinder (500), and the one-way valve (42) is provided on the air blowing pipe (41) to restrict the flow of flue gas in the straight smoke pipe (21) to the shell-breaking cylinder (500).

7. The electrolytic cell exhaust device according to claim 6, characterized in that, The blowing pipe (41) includes a first connecting pipe (411) and a second connecting pipe (412) connected by the one-way valve (42). The one-way valve (42) is fixed to the top of the straight smoke pipe (21). The first connecting pipe (411) is located inside the straight smoke pipe (21), and the second connecting pipe (412) is located outside the straight smoke pipe (21) and is used to connect to the exhaust port of the shell-breaking cylinder (500).

8. The electrolytic cell exhaust device according to claim 7, characterized in that, The first connecting pipe (411) is inclined relative to the exhaust direction, and the end of the first connecting pipe (411) away from the one-way valve (42) is located on the side of the one-way valve (42) close to the smoke collection pipe (1).

9. The electrolytic cell exhaust device according to claim 6, characterized in that, The plurality of air blowing assemblies (4) are divided into a plurality of first air blowing assemblies and a plurality of second air blowing assemblies. Each straight smoke pipe (21) corresponds to one first air blowing assembly and at least one second air blowing assembly. The air blowing pipe (41) of the first air blowing assembly is connected to the head end of the straight smoke pipe (21). The air blowing pipe (41) of the second air blowing assembly is connected to the middle part of the straight smoke pipe (21) and is located at the connection between the straight smoke pipe (21) and the second curved smoke pipe (222).

10. An electrolytic cell production line, characterized in that, Includes the electrolytic cell exhaust device as described in any one of claims 1-9.

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