Electrolytic cell flue gas flow balancing device

Abstract

The present application relates to the technical fields of electrolytic cell flue gas treatment, and specifically discloses a kind of electrolytic cell flue gas flow balancing device, comprising: collection pipeline, electrolytic cell main flue pipe and auxiliary flue pipe branch pipe, the number of electrolytic cell main flue pipe is several, several electrolytic cell main flue pipe is equidistantly arranged in the outer wall of collection pipeline along left and right direction, the inner cavity of electrolytic cell main flue pipe and the inner cavity of collection pipeline are communicated, the number of auxiliary flue pipe branch pipe is several, several auxiliary flue pipe branch pipe is equidistantly arranged in the outer wall of collection pipeline along left and right direction, the inner cavity of auxiliary flue pipe branch pipe and the inner cavity of collection pipeline are communicated.The device solves the limited adjusting effect of traditional reducing pipe, the high energy consumption and large disturbance of butterfly valve adjusting, realizes excellent, stable flow balance effect under the condition of low system resistance, small adjusting disturbance, significantly improves the gas collection efficiency, system energy efficiency and operation reliability.

Description

Technical Field

[0001] This invention relates to the field of electrolytic cell flue gas treatment technology, specifically to an electrolytic cell flue gas flow balancing device. Background Technology

[0002] In the production of metallurgical industries such as electrolytic aluminum, the flue gas generated by electrolytic cells needs to be effectively collected and treated through a flue gas system to meet environmental protection requirements and recover valuable components. Traditional electrolytic cell flue gas collection systems usually use a main flue pipe connecting multiple electrolytic cells through a central pipe, relying on the negative pressure generated by the terminal fan for unified suction. However, in actual operation, due to the characteristics of fluid dynamics, the terminal electrolytic cells far from the fan often have insufficient suction force and low flow rate in their main flue pipes due to the large resistance along the pipe and the severe static pressure attenuation. On the other hand, the electrolytic cells closer to the fan are prone to excessive flue gas flow due to the lower static pressure and stronger suction force at their location. This uneven flow distribution problem of "large in the middle and small at both ends" or "large near end and small far end" not only reduces the overall gas collection efficiency and affects environmental compliance, but may also cause some electrolytic cells to overflow or be over-extracted locally, interfering with the stability of the production process and increasing the system energy consumption.

[0003] To alleviate the above problems, existing technologies typically employ two methods: one is to install a reducer on the main pipeline, gradually reducing the cross-sectional area of ​​the pipeline to adjust the resistance distribution along the flow path and attempt to balance the flow of each branch; the other is to install manual or electric butterfly valves on the main flue pipes of each electrolytic cell, adjusting the valve opening to change the local resistance, thereby manually or automatically intervening in the flow distribution. However, the reducer is a static structural adjustment, and once the design is finalized, it cannot adapt to changes in operating conditions. Moreover, its effect on improving the flow at the end is limited, and it often still cannot completely solve the inherent problem of insufficient suction at the far end. The method of relying on butterfly valve adjustment has obvious drawbacks: first, the butterfly valve generates significant local resistance during the adjustment process, especially at small openings where throttling losses are significant, resulting in high overall system energy consumption; second, the butterfly valve causes severe disturbance to the airflow, easily generating eddies and pressure pulsations, affecting the stable delivery of flue gas. Summary of the Invention

[0004] The purpose of this invention is to solve the problems of uneven distribution of flue gas flow in electrolytic cells due to location differences, as well as the high energy consumption, large flow field disturbance and poor system stability caused by relying on butterfly valve regulation in the existing technology, and to propose an electrolytic cell flue gas flow balancing device.

[0005] To achieve the above objectives, the present invention provides the following technical solution: an electrolytic cell flue gas flow balancing device, comprising: a consolidation pipe, an electrolytic cell main flue pipe, auxiliary flue pipe branches, an auxiliary flue pipe main pipe, a flow measurement device, and a flow regulation mechanism. The consolidation pipe includes several reducing pipes of different diameters, the diameters of which gradually increase from left to right, and a straight pipe connecting every two reducing pipes to form a reducing pipe structure. The number of electrolytic cell main flue pipes is several, and these main flue pipes are equidistantly arranged on the outer wall of the consolidation pipe along the left-right direction. The inner cavities of the main flue pipes and the consolidation pipe are connected, and each main flue pipe corresponds to a reducing pipe in the reducing pipe structure. The number of auxiliary flue pipe branches is several. A plurality of auxiliary flue pipes are equidistantly arranged on the outer wall of the main pipe along the left and right directions. The inner cavities of the auxiliary flue pipes are connected to the inner cavities of the main pipe. The positions of the auxiliary flue pipes correspond one-to-one with the positions of the main flue pipes of the electrolytic cells on the left. The outer ends of the auxiliary flue pipes are all located at the inner ends of the main auxiliary flue pipe. The inner cavities of the auxiliary flue pipes are connected to the inner cavities of the main auxiliary flue pipe. The right end of the main auxiliary flue pipe is located at the right end of the main pipe. The inner cavities of the main auxiliary flue pipe are connected to the inner cavities of the main pipe. The flow measuring device is located at the top of the inner cavity of the main flue pipe of the electrolytic cell. The plurality of flow measuring devices are electrically connected. The flow regulating mechanism is located in the middle of the outer wall of the main flue pipe of the electrolytic cell.

[0006] Furthermore, the flow regulating mechanism includes: a connecting flange, a first valve body, a power groove, an elastic body, and an actuating component. There are two connecting flanges, which are bolted to the upper and lower ends of the main flue of the electrolytic cell, respectively. The upper and lower ends of the first valve body are respectively located at the inner ends of the two connecting flanges. A power groove communicating with the inner cavity is opened in the middle of the rear side of the outer wall of the first valve body. The upper and lower ends of the elastic body are respectively located on the upper and lower sides of the inner cavity of the first valve body. The actuating component is located in the middle of the inner cavity of the first valve body.

[0007] Further, the execution component includes: a limiting base, a limiting groove, a limiting block, a pressing block, a driving block, a worm gear driving disc, a driving groove, and a driving assembly. The limiting base is disposed in the middle of the inner cavity of the first valve body. The elastic body penetrates the inner cavity of the limiting base. There is a gap between the inner wall of the limiting base and the outer wall of the elastic body. The top of the limiting base has six limiting grooves equidistantly spaced along the circumference. The number of limiting blocks is six, and the six limiting blocks are slidably and compatiblely inserted into the inner cavities of the six limiting grooves. The bottom of the pressing block... The outer side of the limiting block is located at the top of the extrusion block. The outer wall of the extrusion block is in contact with the outer wall of the elastic body. The driving block is located at the top outer side of the extrusion block. The worm gear drive disc is rotatably located in the middle of the inner cavity of the first valve body through a bearing. The position of the worm gear drive disc corresponds to the position of the power groove. The top of the worm gear drive disc has six vertically penetrating drive grooves equidistantly spaced along the circumference. The six driving blocks are slidably fitted into the inner cavities of the six drive grooves. The driving assembly is located on the rear side of the outer wall of the first valve body.

[0008] Furthermore, the drive assembly includes: a protective shell, a motor, and a worm gear. The protective shell is located in the middle of the rear side of the outer wall of the first valve body. The power groove is located in the inner cavity of the protective shell. The motor is screwed to the right side of the protective shell. The motor and the flow measuring device are electrically connected. The motor and its corresponding flow measuring device are electrically connected. One end of the worm gear is locked to the output end of the motor through a coupling. The other end of the worm gear is rotatably disposed on the left side of the protective shell through a bearing. The position of the worm gear corresponds to the position of the power groove. The worm gear meshes with the worm wheel drive disc.

[0009] Furthermore, a differential pressure balancing mechanism is provided on the right side of the outer wall of the auxiliary flue main.

[0010] Furthermore, the angle between the main flue pipe of the electrolytic cell and the collection pipe is 30°.

[0011] Furthermore, the differential pressure balancing mechanism includes: a second valve body, a valve orifice, a drive cylinder, a piston, a valve stem, a valve core, and a spring. The second valve body is located on the right side of the outer wall of the auxiliary flue main pipe. A valve orifice extending vertically through the middle of the inner cavity of the second valve body is provided. The drive cylinder is located at the top of the second valve body. The piston is slidably and compatiblely inserted into the middle of the inner cavity of the drive cylinder. The top of the valve stem is located at the bottom of the piston. The bottom of the valve stem extends slidably into the inner cavity of the second valve body. The position of the valve stem corresponds to the position of the valve orifice. The valve core is located at the bottom of the valve stem. The positions of the valve core and the valve orifice correspond and match. The spring is sleeved on the outer wall of the valve stem. The top of the spring is engaged with the bottom of the piston. The bottom of the spring is engaged with the bottom of the inner cavity of the drive cylinder.

[0012] The differential pressure balancing mechanism further includes: a first connecting pipe and a second connecting pipe; one end of the first connecting pipe is located at the top of the inner cavity of the drive cylinder, and the other end of the first connecting pipe is located on the right side of the inner cavity of the auxiliary smoke pipe main pipe. The first connecting pipe enables the inner cavity of the auxiliary smoke pipe main pipe and the inner cavity of the drive cylinder to be connected. One end of the second connecting pipe is located at the bottom of the inner cavity of the drive cylinder, and the other end of the second connecting pipe is located on the right side of the inner cavity of the collection pipe. The second connecting pipe enables the inner cavity of the collection pipe and the inner cavity of the drive cylinder to be connected.

[0013] Compared with the prior art, the beneficial effects of the present invention are:

[0014] (1) By setting up auxiliary smoke pipe branch pipe and auxiliary smoke pipe main pipe, the present invention forms an auxiliary suction path independent of the main smoke pipe, which can specifically enhance the flue gas suction capacity of the terminal electrolytic cell area that is far from the fan. It can pre-compensate the pressure loss and insufficient suction caused by the length of the pipe from the physical structure, provide a stable additional suction foundation for the terminal cell, and realize the improvement of flow distribution from the source.

[0015] (2) By setting a differential pressure balancing mechanism at the junction of the auxiliary smoke pipe main and the main pipe, the present invention maintains the pressure of the auxiliary smoke pipe main at a stable value that is always higher than the pressure of the main pipe. This can automatically lock and stabilize the core driving force of the auxiliary suction system, effectively prevent the "wind grabbing" or flue gas backflow caused by the fluctuation of the fan operating conditions, and ensure that the auxiliary smoke pipe system works continuously as a reliable and constant "helper", providing a stable pressure environment for the balance of the entire system.

[0016] (3) By setting a flow measurement device and a flow adjustment mechanism consisting of a motor, a worm gear and an elastic body on the main flue pipe of each electrolytic cell, the present invention realizes real-time and accurate monitoring of the flue gas flow of each electrolytic cell. It can also automatically and finely adjust the equivalent flow inner diameter of the corresponding main flue pipe according to the monitoring results, thereby dynamically correcting the flow resistance of each branch, so that the flue gas flow of all electrolytic cells tends to be more consistent on the basis of auxiliary structure optimization, and realizes the precise dynamic balance of the closed loop of the whole system.

[0017] (4) By designing the inner diameter of the auxiliary flue pipe branch pipe to decrease sequentially from the far end to the near end of the fan, the present invention compensates for the difference in internal resistance caused by the different geometric lengths of each branch pipe, ensures the uniformity of the smoke drawn by the auxiliary flue pipe system itself, avoids the "smoke grabbing" phenomenon inside the auxiliary system, and makes the distribution of the assistance force to the end area more reasonable and controllable.

[0018] (5) This device solves the drawbacks of limited adjustment effect of traditional variable diameter pipe and high energy consumption and large disturbance of butterfly valve adjustment. It achieves excellent and stable flow balance under the conditions of low system resistance and small adjustment disturbance, and significantly improves gas collection efficiency, system energy efficiency and operation reliability. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the structure of the present invention;

[0021] Figure 2 This is a schematic diagram of the flow regulation mechanism;

[0022] Figure 3 This is a schematic diagram of the internal cavity of the first valve body;

[0023] Figure 4 An exploded view of the flow regulation mechanism;

[0024] Figure 5 for Figure 1 Enlarged view of point A;

[0025] Figure 6 for Figure 1 Enlarged view of point B;

[0026] Figure 7 for Figure 4 Enlarged view of point C;

[0027] Figure 8 for Figure 4 Enlarged view of point D;

[0028] Figure 9 This is a schematic diagram of the differential pressure balancing mechanism;

[0029] Figure 10 This is a cross-sectional view of the differential pressure balancing mechanism;

[0030] Figure 11 This is an exploded view of the differential pressure balancing mechanism.

[0031] The components represented by each number in the diagram are listed below: 1. Main pipe; 2. Electrolytic cell main flue; 3. Auxiliary flue branch pipe; 4. Auxiliary flue main pipe; 5. Differential pressure balancing mechanism; 51. Second valve body; 52. Valve orifice; 53. Drive cylinder; 54. Piston; 55. Valve stem; 56. Valve core; 57. Spring; 58. First connecting pipe; 59. Second connecting pipe; 6. Flow measurement device; 7. Flow regulating mechanism; 71. Connecting flange; 72. First valve body; 73. Power groove; 74. Elastomer; 75. Limiting base; 76. Limiting groove; 77. Limiting block; 78. Extrusion block; 79. Drive block; 710. Worm gear drive disc; 711. Drive groove; 712. Protective shell; 713. Motor; 714. Worm. Detailed Implementation

[0032] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] Reference Figures 1-11An electrolytic cell flue gas flow balancing device includes: a collection pipe 1, an electrolytic cell main flue pipe 2, auxiliary flue pipe branches 3, auxiliary flue pipe main pipe 4, a differential pressure balancing mechanism 5, a flow measurement device 6, and a flow regulation mechanism 7. The collection pipe 1 includes several reducers of different diameters, with the diameter of the reducers gradually increasing from left to right. A straight pipe connects every two reducers to form a reducer pipe structure. The core objective of the reducer and straight pipe combination structure of the collection pipe 1 is to maintain a basically consistent flow velocity throughout the entire pipeline. The design of the reducer diameter gradually increasing from left to right (from far to near) is essentially to adapt the pipe diameter to the flow rate. At the far end, only flue gas from a few electrolytic cells on the left is collected, resulting in a smaller total flow rate. The smaller diameter design allows for maintaining the target flow velocity consistent with the entire pipeline when the flow rate is low, avoiding the need for a larger pipe diameter. Excessive diameter leads to low flow velocity, increased static pressure decay, and insufficient suction at the far end. As flue gas gradually enters from left to right, the total flow rate at the near end continuously increases. The large-diameter design can maintain a flow velocity that is basically consistent with that at the far end when the flow rate increases, avoiding excessively high flow velocity, a surge in friction resistance, and excessive suction at the near end caused by an excessively small pipe diameter. The straight pipe section between the diameter-changing pipes serves as a buffer transition structure for the airflow, allowing the airflow between the two diameter changes to be fully stabilized, so that the flow velocity and pressure gradients can be smoothly transitioned, reducing flow separation, eddies, and local resistance losses caused by sudden changes in pipe diameter. This further ensures the uniformity of flow velocity and the stability of the airflow pattern throughout the pipeline. Finally, through static structural optimization that adapts the flow rate to the pipe diameter, the friction resistance in different areas is balanced from the root cause, effectively alleviating the problem of uneven distribution of flow rate with large near-end flow rate and small far-end flow rate.The main flue gas conveying channel 1 serves as the system's main flue gas transport channel, collecting the flue gas generated by all electrolytic cells and guiding it to downstream purification equipment or fans. There are 12-25 main flue gas pipes 2 from the electrolytic cells, equidistantly positioned along the left-right direction on the outer wall of the main flue gas conveying channel 1. The inner cavities of the main flue gas pipes 2 and 1 are connected, and each main flue gas pipe 2 corresponds to a reducer in the diameter pipe structure. The angle between the main flue gas pipes 2 and 1 is 30°, which optimizes the fluid dynamics when the airflow converges. This angle design reduces eddies, airflow separation, and local resistance losses generated when flue gas flows vertically from the main flue gas pipes 2 into the main flue gas conveying channel 1, thus improving the flue gas flow... The system operates more smoothly, reducing overall system pressure loss, energy consumption, and improving the uniformity and stability of flow distribution in each branch. Each main flue pipe 2 of an electrolytic cell corresponds to one electrolytic cell and is used to directly collect and transport the flue gas generated by a single electrolytic cell. It is equidistantly and vertically connected to the bottom of the main conduit 1 to ensure smooth flow of flue gas into the main channel. There are 2-6 auxiliary flue pipe branches 3, which are equidistantly arranged on the outer wall of the main conduit 1 along the left and right directions. The inner cavity of the auxiliary flue pipe branches 3 is connected to the inner cavity of the main conduit 1. The positions of the auxiliary flue pipe branches 3 correspond one-to-one with the positions of the main flue pipes 2 of several electrolytic cells on the left side. The auxiliary flue pipe branches 3 are used to increase the number of main flue pipes 2 of several electrolytic cells on the left side. The suction power is achieved by connecting the outer ends of several auxiliary smoke pipe branches 3 to the inner ends of the auxiliary smoke pipe main 4. The inner cavities of the auxiliary smoke pipe branches 3 and the auxiliary smoke pipe main 4 are connected. The right end of the auxiliary smoke pipe main 4 is located at the right end of the main pipe 1, and the inner cavities of the auxiliary smoke pipe main 4 and the main pipe 1 are connected. A pressure differential balancing mechanism 5 is located on the right side of the outer wall of the auxiliary smoke pipe main 4. The pressure differential balancing mechanism 5 is used to maintain the pressure in the inner cavity of the auxiliary smoke pipe main 4 at a constant preset value that is always higher than the pressure at the junction of the main pipe 1. This locks in the core driving force of the auxiliary suction system, fundamentally eliminating the risk of backflow of flue gas from the auxiliary pipeline to the main pipeline, and ensuring that the suction power provided by the auxiliary smoke pipe is stable, reliable, and unaffected by the pressure of the main system. The fluctuations provide a stable pressure foundation for the entire flow balance system. Flow measurement devices 6 are located at the top of the inner cavity of the main flue gas pipe 2 of the electrolytic cell. Several flow measurement devices 6 are electrically connected. These devices measure the actual volumetric flow rate of each branch in real-time, online, and non-contact, and transmit the signal to the central control system. The flow regulation mechanism 7 is located in the middle of the outer wall of the main flue gas pipe 2. As the system's execution layer, the flow regulation mechanism 7 receives control commands and changes the inner diameter. By dynamically and precisely adjusting the equivalent flow cross-sectional area and local resistance of each main flue gas pipe 2, it corrects the flue gas flow rate of each branch in real time, ultimately achieving a dynamic balance where the flue gas flow rates of several branches tend to be consistent.

[0034] Specifically, the flow regulating mechanism 7 includes: a connecting flange 71, a first valve body 72, a power groove 73, an elastic body 74, and an actuator. There are two connecting flanges 71, which are bolted to the upper and lower ends of the main flue pipe 2 of the electrolytic cell, respectively. The connecting flanges 71 ensure the strength and sealing of the structural connection. The upper and lower ends of the first valve body 72 are respectively located inside the two connecting flanges 71. A power groove 73 communicating with the inner cavity is opened in the middle of the rear side of the outer wall of the first valve body 72. The upper and lower ends of the elastic body 74 are respectively located on the upper and lower sides of the inner cavity of the first valve body 72. The elastic body 74 is the actuator of the flow regulating mechanism 7. The core variable element of the flow regulation function is made of a specific rubber that is resistant to high temperature and corrosion and has good elasticity. Through its own radial elastic deformation, it directly changes the effective flow inner diameter of the pipeline. When subjected to external radial compression, its inner diameter contracts, increasing pipeline resistance and reducing flow. When the compression is released, it recovers its elasticity, increasing the inner diameter, reducing resistance and increasing flow. The actuator is located in the middle of the inner cavity of the first valve body 72. The actuator can receive and, through mechanical transmission, convert the rotational motion input by the external drive component into a precisely controllable radial linear compression or release action acting on the outer wall of the elastic body 74.

[0035] The actuator includes: a limiting base 75, a limiting groove 76, a limiting block 77, a pressing block 78, a driving block 79, a worm gear drive disc 710, a driving groove 711, and a driving assembly. The limiting base 75 is disposed in the middle of the inner cavity of the first valve body 72. The elastic body 74 penetrates the inner cavity of the limiting base 75. There is a gap between the inner wall of the limiting base 75 and the outer wall of the elastic body 74. Six limiting grooves 76 are equidistantly provided on the top of the limiting base 75 along the circumferential direction. The limiting base 75 can provide a complete... A radial adjustment motion provides precise guidance and limiting reference. Six limiting blocks 77 are slidably fitted into the inner cavities of six limiting grooves 76. Under the constraint of the limiting grooves 76, the limiting blocks 77 convert the driving force from above into pure linear motion and transmit this motion to the extrusion block 78. The bottom outer center of the extrusion block 78 is located at the top of the limiting block 77. The outer wall of the extrusion block 78 contacts the outer wall of the elastomer 74, and the extrusion... Block 78 is the force transmission and application terminal. It directly converts the radial linear motion of the limiting block 77 into a radial compression or release action on the outer wall of the elastic body 74. It is the execution end that directly causes the elastic body 74 to deform, thereby changing the inner diameter of the pipe. The drive block 79 is located at the middle of the outer side of the top of the compression block 78. The worm gear drive disk 710 is rotatably located in the middle of the inner cavity of the first valve body 72 through the bearing. The position of the worm gear drive disk 710 corresponds to the position of the power groove 73. The top of the worm gear drive disk 710 has six vertically penetrating drive grooves 711 equidistantly opened along the circumference. The six drive blocks 79 are slidably adapted to be inserted into the inner cavity of the six drive grooves 711. The worm gear drive disk 710 can convert the externally input rotational motion into the linear motion of the compression block 78 through the cooperation of the drive grooves 711 and the drive blocks 79. The drive assembly is located on the rear side of the outer wall of the first valve body 72. The drive assembly can provide the original driving force for the worm gear drive disk 710.

[0036] The drive assembly includes a protective housing 712, a motor 713, and a worm gear 714. The protective housing 712 is located in the middle of the rear side of the outer wall of the first valve body 72. The power groove 73 is located in the inner cavity of the protective housing 712. The protective housing 712 provides a safe and sealed working environment for precision transmission components such as the motor 713 and the worm gear 714. It completely encloses the area of ​​the power groove 73, effectively preventing external dust and moisture from entering the interior of the first valve body and the transmission mechanism, while also preventing internal lubricating grease from leaking out, and providing a certain degree of safety protection and noise reduction. The motor 713 is screwed to the protective housing 712. On the right side of the protective shell 712, the motor 713 and the flow measuring device 6 are electrically connected. The motor 713 is existing technology and will not be described in detail here. The motor 713 is the power source and actuator of the flow regulating mechanism 7. One end of the worm gear 714 is locked to the output end of the motor 713 through a coupling. The other end of the worm gear 714 is rotatably set on the left side of the protective shell 712 through a bearing. The position of the worm gear 714 corresponds to the position of the power groove 73. The worm gear 714 meshes with the worm gear drive disc 710.

[0037] Specifically, the differential pressure balancing mechanism 5 includes: a second valve body 51, a valve hole 52, a drive cylinder 53, a piston 54, a valve stem 55, a valve core 56, a spring 57, a first connecting pipe 58, and a second connecting pipe 59. The second valve body 51 is located on the right side of the outer wall of the auxiliary flue main pipe 4. A valve hole 52 is provided in the middle of the inner cavity of the second valve body 51, which is the main structure of the differential pressure balancing mechanism 5. It is installed on the right side of the auxiliary flue main pipe 4 and has a through valve hole 52 inside, which is the physical channel for airflow regulation and the mounting base for the valve assembly. The drive cylinder 53 is located at the top of the second valve body 51. The drive cylinder 53 is used to convert the air pressure difference into the mechanical displacement of the piston 54 to realize pressure... The physical transmission of the signal involves a piston 54 that is slidably fitted into the middle of the inner cavity of the drive cylinder 53. The piston 54 senses the pressure difference between the upper and lower chambers of the drive cylinder 53, causing the valve stem 55 and valve core 56 to move up and down, thus automatically adjusting the opening of the valve orifice 52. The top end of the valve stem 55 is located at the bottom end of the piston 54, and the bottom end of the valve stem 55 slidably extends into the inner cavity of the second valve body 51. The position of the valve stem 55 corresponds to the position of the valve orifice 52. The valve stem 55 can accurately transmit the linear motion of the piston 54 to the valve core 56, ensuring synchronous and reliable valve operation. The valve core 56 is located at the bottom end of the valve stem 55, and its position corresponds to and matches the valve orifice 52. Through the valve core 56... The up-and-down movement of the valve core 56 can change the flow area of ​​the valve orifice 52, thereby adjusting the local resistance of the auxiliary flue pipe 4 and achieving dynamic balance of the pressure difference. The spring 57 is sleeved on the outer wall of the valve stem 55, the top end of the spring 57 is engaged with the bottom end of the piston 54, and the bottom end of the spring 57 is engaged with the bottom end of the inner cavity of the drive cylinder 53. The spring 57 is a rotary spring, which undergoes elastic deformation after being squeezed or stretched by external force, and returns to its initial state after the external force is removed. When there is no pressure difference or the pressure difference is small, the spring 57 keeps the valve core 56 at a preset opening. When the system pressure fluctuates, it provides buffering and restoring force to enhance system stability. One end of the first connecting pipe 58 is set at the top end of the inner cavity of the drive cylinder 53. The other end is located on the right side of the inner cavity of the auxiliary smoke pipe main 4. The first connecting pipe 58 enables the inner cavity of the auxiliary smoke pipe main 4 to be connected with the inner cavity of the drive cylinder 53. The first connecting pipe 58 can transmit the pressure in the auxiliary smoke pipe main 4 to the upper cavity of the drive cylinder 53 in real time as one of the pressure feedback signals. One end of the second connecting pipe 59 is located at the bottom of the inner cavity of the drive cylinder 53, and the other end of the second connecting pipe 59 is located on the right side of the inner cavity of the collection pipe 1. The second connecting pipe 59 enables the inner cavity of the collection pipe 1 to be connected with the inner cavity of the drive cylinder 53. The second connecting pipe 59 can transmit the pressure in the collection pipe 1 to the lower cavity of the drive cylinder 53 in real time as another pressure feedback signal.

[0038] The working principle is as follows:

[0039] Step 1: During use, align the bottom end of the main flue pipe 2 of the electrolytic cell with the flue gas outlet of the electrolytic cell, connect the right end of the main pipe 1 to the external flue gas purification system, and then connect the flue gas purification system to the fan. Under the action of the fan, a negative pressure can be formed in the inner cavity of the main pipe 1 and the auxiliary flue pipe 4. According to the process setting requirements, under the adjustment of the differential pressure balancing mechanism 5, the pressure in the inner cavity of the auxiliary flue pipe 4 is always greater than the pressure in the inner cavity of the main pipe 1 at the connection between the auxiliary flue pipe 4 and the main pipe 1 (for example, the pressure in the inner cavity of the auxiliary flue pipe 4 is always 50 Pa greater than the pressure in the inner cavity of the main pipe 1).

[0040] Step 2: During operation, due to the negative pressure inside the main pipe 1, the flue gas generated by the electrolytic cell is discharged through the electrolytic cell exhaust port into the main flue pipe 2 and flows into the main pipe 1. Under the suction of the fan, the flue gas is drawn into the flue gas purification system, and then the purified flue gas is discharged by the fan. Since the main flue pipe 2 of the electrolytic cell on the left is farther from the fan, its suction is lower. Therefore, the suction of the four auxiliary flue pipe branches 3 is increased by the four main flue pipes 2 of the electrolytic cell on the left. The flue gas drawn by the four auxiliary flue pipe branches 3 is discharged into the main pipe 1 through the auxiliary flue pipe main 4, thereby ensuring the balance of flue gas flow in the inner cavity of several main flue pipes 2 of the electrolytic cell.

[0041] Step 3: Simultaneously, as the flue gas flows within the main flue pipe 2 of the electrolytic cell, the flow rate of the flue gas within the main flue pipe 2 can be monitored using the flow measurement device 6, and the signal is transmitted to the central control console. The central control console compares the signals detected by several flow measurement devices 6. When an imbalance in the flue gas flow rate within the main flue pipe 2 of the electrolytic cell occurs, the corresponding motor 713 is activated. The motor 713 drives the worm gear 714 to rotate, which in turn drives the worm wheel drive disk 710 to rotate. The rotation of the worm wheel drive disk 710 can drive the drive groove 71... 1. Rotation is performed. By utilizing the cooperation between the rotating drive groove 711 and the fixed limiting groove 76, the limiting block 77 and the drive block 79 can drive the extrusion block 78 to move. Thus, the extrusion block 78 can extrude the elastic body 74 to cause elastic deformation, causing its inner diameter to decrease. Alternatively, the extrusion block 78 can release the elastic body 74, and under the elastic force of the elastic body 74 itself, it will gradually return to its initial state, thereby increasing its inner diameter. This allows the flow rate of flue gas in the inner cavity of the corresponding electrolytic cell main flue pipe 2 to be adjusted until the flow rate of flue gas in the inner cavity of the electrolytic cell main flue pipe 2 is balanced.

[0042] Step 4: The first connecting pipe 58 connects the top of the inner cavity of the auxiliary flue pipe 4 on the left side of the second valve body 51 to the top of the inner cavity of the drive cylinder 53. The second connecting pipe 59 connects the bottom of the inner cavity of the main pipe 1 below the connection between the auxiliary flue pipe 4 and the main pipe 1, and the inner cavity of the second valve body 51. When the pressure difference at the connection between the auxiliary flue pipe 4 and the main pipe 1 fluctuates due to unstable fan operation, the pressure difference balancing mechanism 5 can automatically adjust it. Under normal conditions, the preload of the spring 57 prevents the valve core 56 from moving. Thus, through engineering design, the pressure difference between the inner cavity of the auxiliary flue pipe 4 and the inner cavity of the main pipe 1 can be kept constant. When the pressure in the inner cavity of the main pipe 1 decreases due to unstable fan operation, the piston 54 will be pushed by the pressure difference to move the valve core 56 downward through the valve stem 55, thereby opening the inner cavity of the valve orifice 52. When the pressure inside the main pipe 1 decreases, in order to maintain the set constant pressure difference, the pressure at the connection of the auxiliary flue pipe 4 must be reduced simultaneously. Since the second valve body 51 is installed in the auxiliary flue pipe 4 and is located on the left side of the connection, when the inner cavity of the valve orifice 52 is opened, its local resistance decreases and the flow rate increases. However, the gas pressure on the left side of the second valve body 51 is relatively stable due to the influence of the gas source conditions, while the gas pressure on the right side of the second valve body 51 will decrease due to the decrease in resistance. Therefore, opening the inner cavity of the valve orifice 52 can reduce the gas pressure on the right side of the second valve body 51, so that it can be rematched with the gas pressure in the inner cavity of the main pipe 1 that has been reduced, thereby maintaining the set pressure difference value. Conversely, when the pressure in the inner cavity of the main pipe 1 increases, it will push the piston 54 to move the valve core 56 upward through the valve stem 55 under the action of the pressure difference, thereby reducing the inner cavity of the valve orifice 52, thus ensuring that the pressure difference between the pressure in the inner cavity of the auxiliary flue pipe 4 and the pressure in the inner cavity of the main pipe 1 is constant, thereby ensuring the normal operation of the equipment.

[0043] In summary, this device overcomes the shortcomings of traditional variable diameter pipes (VDPs) in terms of limited adjustment effect and butterfly valves in terms of high energy consumption and large disturbances. It achieves excellent and stable flow balance under conditions of low system resistance and small adjustment disturbances, significantly improving gas collection efficiency, system energy efficiency, and operational reliability.

[0044] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to specific implementations. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A flue gas flow balancing device for an electrolytic cell, characterized in that, include: The main pipe (1) includes several reducing pipes with different diameters. The diameter of the reducing pipes gradually increases from left to right, and a straight pipe is connected between every two reducing pipes to form a reducing pipe structure. Electrolytic cell main smoke pipe (2), the number of electrolytic cell main smoke pipes (2) is several, several electrolytic cell main smoke pipes (2) are respectively arranged at equal intervals along the left and right directions on the outer wall of the collection pipe (1), the inner cavity of the electrolytic cell main smoke pipe (2) is connected to the inner cavity of the collection pipe (1), and each electrolytic cell main smoke pipe (2) corresponds to the variable diameter pipe in the diameter pipe structure; Auxiliary smoke pipe branch pipe (3), the number of the auxiliary smoke pipe branch pipe (3) is several, the several auxiliary smoke pipe branch pipes (3) are respectively arranged at equal intervals along the left and right directions on the outer wall of the main pipe (1), the inner cavity of the auxiliary smoke pipe branch pipe (3) is connected to the inner cavity of the main pipe (1), and the positions of the several auxiliary smoke pipe branch pipes (3) correspond one-to-one with the positions of the several main smoke pipes (2) of the electrolytic cells on the left side; The outer ends of several auxiliary smoke pipe branches (3) are all located at the inner ends of the auxiliary smoke pipe main pipe (4). The inner cavities of the auxiliary smoke pipe branches (3) and the inner cavities of the auxiliary smoke pipe main pipe (4) are connected. The right end of the auxiliary smoke pipe main pipe (4) is located at the right end of the main pipe (1). The inner cavities of the auxiliary smoke pipe main pipe (4) and the inner cavities of the main pipe (1) are connected. A flow measurement device (6) is installed at the top of the inner cavity of the main flue pipe (2) of the electrolytic cell, and several flow measurement devices (6) are electrically connected. A flow regulating mechanism (7) is provided in the middle of the outer wall of the main flue pipe (2) of the electrolytic cell; The flow regulation mechanism (7) includes: Two connecting flanges (71) are bolted to the upper and lower ends of the main flue pipe (2) of the electrolytic cell, respectively. The first valve body (72) has its upper and lower ends respectively located at the inner ends of two connecting flanges (71), and a power groove (73) communicating with its inner cavity is provided in the middle of the rear side of the outer wall of the first valve body (72). An elastomer (74) is provided at its upper and lower ends on the upper and lower sides of the inner cavity of the first valve body (72), respectively. An execution component is disposed in the middle of the inner cavity of the first valve body (72).

2. The electrolytic cell flue gas flow balancing device according to claim 1, characterized in that: The execution component includes: A limiting base (75) is disposed in the middle of the inner cavity of the first valve body (72). The elastic body (74) penetrates the inner cavity of the limiting base (75). There is a gap between the inner wall of the limiting base (75) and the outer wall of the elastic body (74). Six limiting grooves (76) are equidistantly provided at the top of the limiting base (75) along the circumferential direction. The number of limiting blocks (77) is six, and the six limiting blocks (77) are slidably adapted to be inserted into the inner cavity of six limiting grooves (76); The extrusion block (78) is located at the top of the limiting block (77) at the middle of the outer side of the bottom end of the extrusion block (78), and the outer wall of the extrusion block (78) is in contact with the outer wall of the elastic body (74); A drive block (79) is disposed at the middle of the outer side of the top of the extrusion block (78); The worm gear drive disk (710) is rotatably disposed in the middle of the inner cavity of the first valve body (72) via bearings. The position of the worm gear drive disk (710) corresponds to the position of the power groove (73). The top of the worm gear drive disk (710) has six vertically penetrating drive grooves (711) equidistantly spaced along the circumference. The six drive blocks (79) are slidably and compatiblely inserted into the inner cavity of the six drive grooves (711). A drive assembly is disposed on the rear side of the outer wall of the first valve body (72).

3. The electrolytic cell flue gas flow balancing device according to claim 2, characterized in that: The driving component includes: A protective shell (712) is disposed in the middle of the rear side of the outer wall of the first valve body (72), and the power groove (73) is located in the inner cavity of the protective shell (712); The motor (713) is screwed to the right side of the protective shell (712), and the motor (713) is electrically connected to the flow measuring device (6). The motor (713) and the corresponding flow measuring device (6) are electrically connected. The worm (714) has one end locked to the output end of the motor (713) by a coupling, and the other end of the worm (714) is rotatably disposed on the left side of the protective shell (712) by a bearing. The position of the worm (714) corresponds to the position of the power groove (73), and the worm (714) meshes with the worm gear drive disk (710).

4. The electrolytic cell flue gas flow balancing device according to claim 3, characterized in that: A differential pressure balancing mechanism (5) is provided on the right side of the outer wall of the auxiliary flue main (4).

5. The electrolytic cell flue gas flow balancing device according to claim 4, characterized in that: The angle between the main flue pipe (2) of the electrolytic cell and the collection pipe (1) is 30°.

6. The electrolytic cell flue gas flow balancing device according to claim 5, characterized in that: The differential pressure balancing mechanism (5) includes: The second valve body (51) is located on the right side of the outer wall of the auxiliary flue main pipe (4), and a valve hole (52) that runs vertically through the middle of the inner cavity of the second valve body (51). A drive cylinder (53) is disposed at the top of the second valve body (51); Piston (54), which is slidably and compatiblely inserted into the middle of the inner cavity of the drive cylinder (53); The valve stem (55) has its top end located at the bottom end of the piston (54), and the bottom end of the valve stem (55) extends slidably into the inner cavity of the second valve body (51). The position of the valve stem (55) corresponds to the position of the valve hole (52). The valve core (56) is located at the bottom end of the valve stem (55), and the valve core (56) and the valve hole (52) are positioned correspondingly and matched. Spring (57) is sleeved on the outer wall of valve stem (55), the top end of spring (57) is engaged with the bottom end of piston (54), and the bottom end of spring (57) is engaged with the bottom end of inner cavity of drive cylinder (53).

7. The electrolytic cell flue gas flow balancing device according to claim 6, characterized in that: The differential pressure balancing mechanism (5) further includes: The first connecting pipe (58) has one end located at the top of the inner cavity of the drive cylinder (53) and the other end located on the right side of the inner cavity of the auxiliary smoke pipe main (4). The first connecting pipe (58) can connect the inner cavity of the auxiliary smoke pipe main (4) and the inner cavity of the drive cylinder (53). The second connecting pipe (59) has one end located at the bottom of the inner cavity of the drive cylinder (53) and the other end located on the right side of the inner cavity of the summing pipe (1). The second connecting pipe (59) enables the inner cavity of the summing pipe (1) and the inner cavity of the drive cylinder (53) to be connected.

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