An aluminium electrolysis cell flue gas temperature monitoring device

Abstract

This utility model discloses a flue gas temperature monitoring device for aluminum electrolysis cells, including a housing. Two F-type dual-channel front air inlets and two F-type dual-channel rear exhaust heads are respectively installed on the left and right outer walls of the housing. The interior of the housing is provided with a Venturi-type air guide chamber for connecting the F-type dual-channel front air inlets and F-type dual-channel rear exhaust heads in the same X-axis direction. This utility model utilizes the F-type dual-channel front air inlets, the housing, and the F-type dual-channel rear exhaust heads to form a diversion channel on the aluminum electrolysis cell exhaust pipe, allowing the flue gas to sequentially pass through the front air inlets, the housing, and the rear exhaust heads and return to the exhaust pipe. During this process, a temperature sensor detects the passing flue gas, and a motor and bevel gear reversing transmission structure drive the turbine-type intake auxiliary assembly and the conical cleaning hood to achieve flue gas flow rate control and cleaning of the temperature sensor head.

Description

Technical Field

[0001] This utility model relates to the field of aluminum electrolysis cell technology, specifically to an aluminum electrolysis cell flue gas temperature monitoring device. Background Technology

[0002] In aluminum production, the exhaust gas temperature monitoring device for aluminum electrolytic cells monitors real-time temperature changes in the emitted gases to ensure compliance with environmental standards and reduce harmful gas emissions. Abnormal increases in exhaust gas temperature may indicate overheating or malfunction of the aluminum electrolytic cell; early warning can prevent equipment damage and safety accidents, ensuring production safety. The device mainly consists of sensors, a signal acquisition unit, a data transmission system, and a display and control module. Sensors, typically infrared thermometers, thermocouples, or infrared radiation thermometers, are installed at key locations in the exhaust pipe or exhaust port and can operate stably in high-temperature and corrosive environments. The signal acquisition unit converts the analog signals from the sensors into digital signals, ensuring data accuracy and interference resistance. The data transmission system transmits temperature information in real-time to a monitoring center or remote system, supporting remote monitoring and data storage. The display and control module can display the exhaust gas temperature in real time, set alarm thresholds, automatically adjust the exhaust system, or issue alarms to ensure that the exhaust gas temperature is within a safe range. Currently, the flue gas from aluminum electrolysis cells is characterized by high flow rate and high heat dissipation. When infrared thermometers, thermocouples, or infrared radiation thermometers are installed in the exhaust pipe or exhaust port of the electrolysis cell, the high-velocity flue gas directly passes through the sensing part, and the flow state of the high-velocity flue gas exhibits strong turbulent characteristics. When the high-velocity flue gas impacts the sensor sensing end in the form of irregular eddies, a dynamic boundary layer will be formed on the sensor surface. This fluid disturbance not only changes the local heat transfer coefficient but also causes the heat exchange process between the sensor and the flue gas to exhibit nonlinear characteristics. Especially in the narrow area of ​​the exhaust pipe, the Venturi effect caused by the sudden increase in flow velocity will further aggravate the non-uniformity of the temperature field distribution, making it difficult for the sensor to capture a representative average temperature value. Furthermore, suspended alumina particles and fluoride aerosols in the aluminum electrolysis flue gas will gradually deposit on the sensor surface, forming a porous heat insulation layer. As the production cycle extends, the "temperature decay" phenomenon caused by the accumulation of pollutants will continue to deteriorate the measurement accuracy. Utility Model Content

[0003] The purpose of this invention is to provide a temperature monitoring device for flue gas from an aluminum electrolysis cell. This device utilizes an F-type dual-channel front inlet head, a housing, and an F-type dual-channel rear exhaust head to form a diversion channel on the aluminum electrolysis cell's exhaust pipe. This allows the flue gas to pass sequentially through the front inlet head, housing, and rear exhaust head before returning to the exhaust pipe. During this process, a temperature sensor detects the passing flue gas, and a motor and bevel gear reversing transmission structure drive a turbine-type intake auxiliary assembly and a conical cleaning hood to achieve flue gas flow rate control and cleaning of the temperature sensor head, thereby solving the problems mentioned in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a device for monitoring the temperature of flue gas from an aluminum electrolysis cell, comprising: The housing has two F-type dual-channel front air intake heads and two F-type dual-channel rear exhaust heads installed on its left and right outer walls, respectively. Inside the housing is a Venturi-type air guide chamber for connecting the F-type dual-channel front air intake heads and F-type dual-channel rear exhaust heads in the same X-axis direction. Temperature sensors are installed on both sides of the top of the housing, with the sensor heads extending into the Venturi-type air guide chambers. A turbine-type intake auxiliary assembly connected to the Venturi-type air guide chamber is installed inside the housing on one side of the F-type dual-channel front air intake head. A vertical shaft is rotatably mounted inside the Venturi-type air guide chamber, with a conical cleaning cover fixed to the top of the shaft for contact with the outer surface of the temperature sensor head. A bevel gear reversing transmission structure for maintaining power connection is installed between the vertical shaft and the turbine-type intake auxiliary assembly. The support is fixed to the bottom of the housing. A linear gear transmission assembly for connecting two vertical shafts in the Y-axis direction is installed inside the support. A motor for driving one of the vertical shafts to rotate is installed on one side of the bottom of the support.

[0005] Preferably, the turbine-type intake auxiliary assembly includes a pump housing fixed inside one side of the housing, a rotating shaft rotatably mounted inside the pump housing, a compressor turbine fixed at one end of the rotating shaft, and an exhaust pipe integrally formed on one side of the top of the pump housing, with the top of the exhaust pipe extending upward into the interior of the Venturi-type air guide chamber.

[0006] Preferably, two symmetrical auxiliary air intake chambers are provided on the outer wall of the housing near the F-type dual-channel front air intake head. The auxiliary air intake chambers are used to connect the F-type dual-channel front air intake head and the pump housing.

[0007] Preferably, the top end of the exhaust pipe is provided with an arc-shaped notch, the curvature of which is equal to the mid-section radius of the Venturi-type air guide chamber.

[0008] Preferably, the bevel gear reversing transmission structure includes a driving bevel gear fixed to one end of the vertical shaft surface and a driven bevel gear installed at the end of the shaft away from the compressor turbine, with the driven bevel gear and the driving bevel gear meshing with each other.

[0009] Preferably, the outer peripheral surface of the conical cleaning cover is provided with a hollow part, and the bottom of the conical cleaning cover is integrally formed with a number of annular equally spaced scrapers, the top of the scrapers extending vertically upward, and one side of the scraper contacting the outer surface of the temperature sensor head.

[0010] Preferably, a conical cavity is provided on one side inside the housing for the conical cleaning hood to rotate, and the top of the vertical shaft extends upward into the conical cavity.

[0011] Preferably, the linear gear transmission assembly includes a primary gear disk rotatably mounted at the center of the support, secondary gears rotatably mounted inside the support on both sides of the primary gear disk, and a central gear fixed at the bottom of the vertical shaft. The central gear, secondary gear, and primary gear disk mesh sequentially.

[0012] Preferably, the support has a recessed cavity inside for the rotation of the central gear, secondary gear, and primary gear disc, and the bottom end of the vertical shaft extends into the recessed cavity.

[0013] Compared with the prior art, the beneficial effects of this utility model are: This utility model provides an aluminum electrolysis cell flue gas temperature monitoring device. It comprises an F-type dual-channel front inlet head, a housing, an F-type dual-channel rear exhaust head, a temperature sensor, a turbine-type intake auxiliary assembly, and a conical cleaning hood. The F-type dual-channel front inlet head, housing, and rear exhaust head form a diversion channel on the aluminum electrolysis cell exhaust pipe, allowing the flue gas to sequentially pass through the front inlet head, housing, and rear exhaust head before returning to the exhaust pipe. During this process, the temperature sensor detects the passing flue gas, and the motor and conical... The gear-driven transmission structure powers the turbine-type intake auxiliary assembly and the conical cleaning hood to control the flue gas velocity and clean the temperature sensor head. The split-channel design, through the guiding effect of two F-shaped dual-channel front intake heads, decomposes the high-speed airflow from the main flue of the aluminum electrolysis cell into two controllable flow patterns. The turbine-type intake auxiliary assembly, driven by the motor and bevel gear transmission structure, creates an adjustable negative pressure adsorption effect. By changing the turbine blade speed, it actively controls the flow distribution of the flue gas within the split channel, effectively reducing the gas pressure in the sensor contact area. The shear stress transforms the originally turbulent flow into a laminar flow state. The stable flow field characteristics significantly reduce the dynamic fluctuations of the boundary layer on the surface of the temperature sensor, making the heat transfer process closer to the steady-state heat transfer model, thereby improving the authenticity and repeatability of temperature sensing. Secondly, the symmetrical layout of the front air inlet and the rear exhaust head forms a Venturi effect compensation mechanism, which not only avoids the excessive pressure drop loss of the traditional single-channel acceleration section, but also weakens the interference of flue gas velocity changes on the temperature field through the energy dissipation effect of the split channel. This fluid self-balancing characteristic prolongs the gas residence time in the sensor contact area. Finally, the rotating sweeping motion of the cone-shaped cleaning hood uses the high-speed rotating cleaning blade to form periodic contact with the sensor sensing end, directly peeling off the alumina shell and fluoride crystals attached to the surface of the sensitive element. At the aerodynamic level, the directional airflow generated by the turbine couples with the rotation trajectory of the cleaning hood to form a local high-pressure air curtain effect, which can not only prevent the secondary deposition of new pollutants during the cleaning interval, but also blow away the residual particles after cleaning, fundamentally solving the temperature decay problem caused by the accumulation of contaminant layer in traditional fixed sensors. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the main structure of this utility model; Figure 2 This is a schematic diagram of the three-dimensional structure of the present invention. Figure 1 ; Figure 3 This is a schematic diagram of the three-dimensional structure of the present invention. Figure 2 ; Figure 4 This is a schematic diagram of the upper and lower isometric isometric solid structure of this utility model; Figure 5 This is a three-dimensional cross-sectional structural diagram of the present invention; Figure 6 This is a schematic diagram of the front cross-sectional structure of this utility model; Figure 7 This utility model Figure 5 Enlarged structural diagram at point A in the middle; Figure 8 This is a schematic diagram of the three-dimensional structure of the turbine-type intake auxiliary assembly according to Embodiment 2 of this utility model; Figure 9 This is a schematic cross-sectional view of the support structure in Embodiment 3 of this utility model.

[0015] In the diagram: 1. Housing; 101. Venturi-type air intake chamber; 102. Secondary air intake chamber; 2. F-type dual-channel front air intake head; 3. F-type dual-channel rear exhaust head; 4. Temperature sensor; 5. Turbine-type intake auxiliary assembly; 501. Pump housing; 502. Exhaust pipe; 503. Compressor turbine; 504. Shaft; 6. Support; 601. Lower cavity; 7. Motor; 8. Bevel gear reversing transmission structure; 801. Driven bevel gear; 802. Driving bevel gear; 9. Conical cleaning hood; 901. Hollowed-out section; 902. Scraper; 10. Linear gear transmission group; 1001. First-stage gear disk; 1002. Second-stage gear; 1003. Center gear; 11. Vertical shaft. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0017] Example 1, by Figures 1 to 6The present invention includes a housing 1. Two F-type dual-channel front air inlets 2 and two F-type dual-channel rear exhaust outlets 3 are respectively installed on the left and right outer walls of the housing 1. The housing 1 is provided with a Venturi-type air guide chamber 101 for connecting the F-type dual-channel front air inlets 2 and F-type dual-channel rear exhaust outlets 3 in the same X-axis direction. The F-type dual-channel front air inlets 2 at the air inlet position of the housing 1 can effectively guide and divert the exhaust airflow. Through the dual-channel layout, it can not only increase the airflow distribution area, but also achieve uniform gas introduction, reduce local pressure difference and turbulence, thereby reducing airflow instability. The F-type dual-channel rear exhaust head 3 efficiently discharges exhaust gas, reducing gas retention and accumulation in the system. The symmetrical distribution of the two F-type dual-channel rear exhaust heads 3 is used to disperse exhaust pressure, reduce exhaust resistance, and reduce airflow reverse interference, thereby maintaining the airflow continuity and stability of the system. Temperature sensors 4 are installed on both sides of the top of the housing 1, and the sensing head of the temperature sensor 4 extends into the Venturi-type air guide chamber 101. Inside the housing 1 on one side of the F-type dual-channel front air intake head 2, there is a turbine-type air intake auxiliary assembly 5 that communicates with the Venturi-type air guide chamber 101. Inside the Venturi-type air guide chamber 101, a vertical shaft 11 is rotatably mounted. The top of the vertical shaft 11 is fixed with a conical cleaning cover 9 for contacting the outer surface of the sensing head of the temperature sensor 4. A bevel gear reversing transmission structure 8 for maintaining power connection is installed between the vertical shaft 11 and the turbine-type air intake auxiliary assembly 5. Support 6 is fixed to the bottom of housing 1. A linear gear transmission group 10 for connecting two vertical shafts 11 in the Y-axis direction is installed inside support 6. A motor 7 for driving one of the vertical shafts 11 to rotate is installed on one side of the bottom of support 6.

[0018] This embodiment of a method for monitoring the temperature of flue gas from an aluminum electrolysis cell, as described in the above-mentioned aluminum electrolysis cell flue gas temperature monitoring device, includes the following steps: S101: Install the F-type dual-channel front air inlet head 2 and the F-type dual-channel rear exhaust head 3 into the exhaust pipe of the aluminum electrolysis cell, so that the installation direction of the F-type dual-channel front air inlet head 2, the housing 1, and the F-type dual-channel rear exhaust head 3 is parallel to the extension direction of the exhaust pipe of the aluminum electrolysis cell. A portion of the high-speed flue gas flow in the exhaust pipe of the aluminum electrolysis cell is separated and enters the housing 1 through the F-type dual-channel front air inlet head 2, and then flows back into the exhaust pipe of the aluminum electrolysis cell after passing through the sensing head of the temperature sensor 4 and the F-type dual-channel rear exhaust head 3. S102: During the process of airflow entering the casing 1, the temperature data of the flue gas is measured by the temperature sensor 4. The temperature data collected by the temperature sensor 4 is transmitted to the monitoring system or control center in real time for operators to analyze and judge. S103: When the operator starts the motor 7, the drive shaft of the motor 7 directly drives one vertical shaft 11 to rotate. The other vertical shaft 11 is driven to rotate by the linear gear transmission group 10. Then, the vertical shaft 11 uses the bevel gear reversing transmission structure 8 to drive the turbine-type air intake auxiliary assembly 5 and the cone-shaped cleaning hood 9 to work. The turbine-type air intake auxiliary assembly 5 adjusts the flow rate of the flue gas to ensure that the airflow reaches the preset flow rate range when passing through the area of ​​the temperature sensor 4. The cone-shaped cleaning hood 9 removes the deposits, contaminants and dust from the surface of the sensing head of the temperature sensor 4 and its vicinity.

[0019] Example 2, based on Example 1, is... Figure 7 and Figure 8 The turbine-type intake auxiliary assembly 5 includes a pump housing 501 fixed inside one side of the housing 1, a rotating shaft 504 rotatably mounted inside the pump housing 501, a compressor turbine 503 fixed at one end of the rotating shaft 504, and an exhaust pipe 502 integrally formed on one side of the top of the pump housing 501, with the top of the exhaust pipe 502 extending upward into the interior of the venturi-type air guide chamber 101. Two symmetrical secondary air intake chambers 102 are provided on the outer wall of the casing 1 near the F-type dual-channel front air intake head 2. The secondary air intake chambers 102 are used to connect the F-type dual-channel front air intake head 2 and the pump housing 501. The top of the exhaust pipe 502 is provided with an arc-shaped notch, and the curvature of the arc-shaped notch is equal to the mid-section radius of the Venturi-type air guide chamber 101. The bevel gear reversing transmission structure 8 includes a driving bevel gear 802 fixed to one end of the surface of the vertical shaft 11 and a driven bevel gear 801 mounted on the end of the rotating shaft 504 away from the compressor turbine 503. The driven bevel gear 801 and the driving bevel gear 802 mesh with each other. The motor 7 and the linear gear transmission set 10 drive the vertical shaft 11 in the two housings 1 to rotate synchronously. Then, the vertical shaft 11 drives the rotating shaft 504 and the compressor turbine 503 to rotate through the driving bevel gear 802 and the driven bevel gear 801. The compressor turbine 503 drives the F-type double... The flue gas in the channel front air inlet head 2 is forced into the exhaust pipe 502 through the secondary air inlet chamber 102, and then sent to the venturi-type air guide chamber 101 through the exhaust pipe 502 for the temperature sensor 4 to detect. In this way, when the flue gas flow rate fluctuates in the venturi-type air guide chamber 101, the negative pressure adsorption intensity is adjusted to balance the pressure difference of the detection channel, prevent flue gas backflow or insufficient flow, and ensure that the airflow has sufficient flow rate when passing through the area of ​​the temperature sensor 4, avoiding temperature measurement deviation caused by slow airflow, and adapting to different working conditions. The outer periphery of the conical cleaning hood 9 is provided with a hollow section 901. The bottom of the conical cleaning hood 9 is integrally formed with several annular scrapers 902 at equal intervals. The top of the scrapers 902 extends vertically upward, and one side of the scraper 902 contacts the outer surface of the sensing head of the temperature sensor 4. A conical cavity is provided on one side inside the housing 1 for the conical cleaning hood 9 to rotate. The top of the vertical shaft 11 extends upward into the conical cavity. When the conical cleaning hood 9 is driven to rotate by the vertical shaft 11, the hollow section 901 allows flue gas to pass through, while the scrapers 902 contact the outer surface of the sensing head of the temperature sensor 4 to remove deposits, dust and impurities on and around the sensor surface, keep the sensor clean and improve the accuracy of measurement.

[0020] Example 3, based on Example 2, by Figure 9 The linear gear transmission assembly 10 includes a primary gear disk 1001 rotatably mounted at the center of the support 6, secondary gears 1002 rotatably mounted inside the support 6 on both sides of the primary gear disk 1001, and a central gear 1003 fixed to the bottom of the vertical shaft 11. The central gear 1003, secondary gear 1002, and primary gear disk 1001 mesh sequentially. The support 6 has a recessed cavity 601 for the rotation of the central gear 1003, secondary gear 1002, and primary gear disk 1001. The bottom of the vertical shaft 11 extends into the recessed cavity. In section 601, when the two vertical shafts 11 are driven to rotate by the motor 7 and the linear gear transmission group 10, the drive shaft of the motor 7 directly drives one of the vertical shafts 11 to rotate. Then, the vertical shaft 11 drives the first gear disk 1001 to rotate in sequence through the central gear 1003 and the second gear 1002. The other vertical shaft 11 continues to be driven to rotate by the second gear 1002 and the central gear 1003 in the other side of the sink cavity 601, so as to make the turbine-type intake auxiliary assembly 5 and the cone cleaning cover 9 in the two housings 1 share a support 6, ensuring the stable operation of the device.

[0021] In this embodiment, the operator first installs the F-type dual-channel front air inlet 2 and the F-type dual-channel rear exhaust head 3 into the exhaust pipe of the aluminum electrolysis cell. The installation directions of the F-type dual-channel front air inlet 2, the housing 1, and the F-type dual-channel rear exhaust head 3 are parallel to the extension direction of the aluminum electrolysis cell exhaust pipe. A portion of the high-speed flue gas flow in the aluminum electrolysis cell exhaust pipe then enters the housing 1 through the F-type dual-channel front air inlet 2. At this time, the flue gas velocity slows down, reducing the formation of turbulence and eddies, thus ensuring that the temperature field of the flue gas is minimized when passing through the temperature sensor 4 area. The flue gas flow is uniform, and then this part of the flue gas flow passes through the sensing head of temperature sensor 4 and the F-type dual-channel rear exhaust head 3 and re-enters into the aluminum electrolysis cell exhaust pipe; during the process of the airflow entering the casing 1, because the airflow has undergone the buffering and homogenization treatment in the front section, the temperature data measured by temperature sensor 4 is highly representative and reflects the actual temperature of the exhaust gas; when the operator starts the motor 7 to work, the drive shaft of the motor 7 directly drives one vertical shaft 11 to rotate, and the other vertical shaft 11 is driven to rotate by the linear gear transmission group 10, and then the vertical shaft 11 uses bevel gears The reversing transmission structure 8 drives the turbine-type intake auxiliary assembly 5 and the conical cleaning hood 9 to work. During this process, the rotation speed of the turbine-type intake auxiliary assembly 5 and the conical cleaning hood 9 is proportional to the rotation speed of the motor 7. The turbine-type intake auxiliary assembly 5 regulates the flow rate of the flue gas to ensure that the airflow reaches the preset flow rate range when passing through the area of ​​the temperature sensor 4. By regulating the airflow speed, measurement errors caused by excessively fast airflow are effectively avoided, and temperature deviations caused by excessively slow airflow are also prevented. This ensures that the device maintains good detection conditions under different operating conditions. The conical cleaning hood 9 is driven by the motor 7, the bevel gear reversing transmission structure 8, and the vertical shaft 11 to remove deposits, contaminants, and dust from the surface of the sensing head of the temperature sensor 4 and its vicinity. This prevents these impurities from affecting the measurement accuracy of the temperature sensor. By utilizing this cleaning mechanism, the device can keep the temperature sensor 4 clean and in normal working condition without interrupting the detection work, thereby extending the service life of the temperature sensor 4 and ensuring the continuity and accuracy of detection. After the detection is completed, the temperature data collected by the temperature sensor 4 is transmitted to the monitoring system or control center in real time for operators to analyze and judge.

[0022] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0023] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A device for monitoring the temperature of flue gas from an aluminum electrolysis cell, characterized in that, include: The housing (1) has two F-type dual-channel front air intake heads (2) and two F-type dual-channel rear exhaust heads (3) installed on its left and right outer walls, respectively. The housing (1) has a Venturi-type air guide chamber (101) for connecting the F-type dual-channel front air intake heads (2) and F-type dual-channel rear exhaust heads (3) in the same X-axis direction. Temperature sensors (4) are installed on both sides of the top of the housing (1), and the sensing heads of the temperature sensors (4) extend into the Venturi-type air guide chamber (101). Inside the housing (1) on one side of the F-type dual-channel front air intake head (2), there is a turbine-type air intake auxiliary assembly (5) that communicates with the Venturi-type air guide chamber (101). A vertical shaft (11) is rotatably mounted inside the Venturi-type air guide chamber (101). A conical cleaning cover (9) for contacting the outer surface of the sensing head of the temperature sensor (4) is fixed at the top of the vertical shaft (11). A bevel gear reversing transmission structure (8) for maintaining power connection is installed between the vertical shaft (11) and the turbine-type air intake auxiliary assembly (5). Support (6), the support (6) is fixed to the bottom end of the housing (1), the support (6) is equipped with a linear gear transmission group (10) for connecting two vertical shafts (11) in the Y-axis direction, and a motor (7) for driving one of the vertical shafts (11) to rotate is installed on one side of the bottom end of the support (6).

2. The aluminum electrolysis cell flue gas temperature monitoring device according to claim 1, characterized in that: The turbine-type intake auxiliary assembly (5) includes a pump housing (501) fixed inside one side of the housing (1), a rotating shaft (504) rotatably installed inside the pump housing (501), a compressor turbine (503) fixed at one end of the rotating shaft (504), and an exhaust pipe (502) integrally formed on one side of the top of the pump housing (501). The top of the exhaust pipe (502) extends upward to the interior of the Venturi-type air guide chamber (101).

3. The aluminum electrolysis cell flue gas temperature monitoring device according to claim 2, characterized in that: The outer wall of the housing (1) near the F-type dual-channel front air inlet head (2) has two symmetrical auxiliary air inlets (102), which are used to connect the F-type dual-channel front air inlet head (2) and the pump housing (501).

4. The aluminum electrolysis cell flue gas temperature monitoring device according to claim 2, characterized in that: The exhaust pipe (502) has an arc-shaped notch at its top end, and the curvature of the arc-shaped notch is equal to the radius of the middle section of the Venturi-type air guide chamber (101).

5. The aluminum electrolysis cell flue gas temperature monitoring device according to claim 2, characterized in that: The bevel gear reversing transmission structure (8) includes a driving bevel gear (802) fixed on one end of the surface of the vertical shaft (11) and a driven bevel gear (801) installed on the end of the rotating shaft (504) away from the compressor turbine (503). The driven bevel gear (801) and the driving bevel gear (802) mesh with each other.

6. The aluminum electrolysis cell flue gas temperature monitoring device according to claim 1, characterized in that: The outer periphery of the conical cleaning cover (9) is provided with a hollow part (901). The bottom of the conical cleaning cover (9) is integrally formed with several annular equally spaced scrapers (902). The top of the scraper (902) extends vertically upward, and one side of the scraper (902) is in contact with the outer surface of the sensing head of the temperature sensor (4).

7. The aluminum electrolysis cell flue gas temperature monitoring device according to claim 6, characterized in that: The housing (1) has a conical cavity on one side inside for the conical cleaning hood (9) to rotate, and the top of the vertical shaft (11) extends upward into the conical cavity.

8. The aluminum electrolysis cell flue gas temperature monitoring device according to claim 5, characterized in that: The linear gear transmission assembly (10) includes a first-stage gear disk (1001) rotatably mounted at the center of the support (6), a second-stage gear (1002) rotatably mounted inside the support (6) on both sides of the first-stage gear disk (1001), and a center gear (1003) fixed at the bottom of the vertical shaft (11). The center gear (1003), the second-stage gear (1002), and the first-stage gear disk (1001) mesh in sequence.

9. The aluminum electrolysis cell flue gas temperature monitoring device according to claim 8, characterized in that: The support (6) has a recessed cavity (601) inside for the rotation of the central gear (1003), the secondary gear (1002), and the primary gear disk (1001), and the bottom end of the vertical shaft (11) extends into the recessed cavity (601).

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