Flue gas temperature monitoring device and method for aluminum electrolysis cell

Abstract

The invention discloses a flue gas temperature monitoring device and method for an aluminum electrolysis cell, and the device comprises a housing, and the left and right outer walls of the housing are respectively provided with two F-shaped dual-channel front gas inlet heads and two F-shaped dual-channel rear gas exhaust heads. A Venturi type air guide cavity used for communicating the F-shaped double-channel front air inlet head and the F-shaped double-channel rear air exhaust head in the same X-axis direction is formed in the machine shell. The F-shaped double-channel front air inlet head, the machine shell and the F-shaped double-channel rear air exhaust head are used for forming a branch channel on the aluminum electrolysis cell smoke exhaust pipe, so that smoke sequentially passes through the front air inlet head, the machine shell and the rear air exhaust head and returns to the smoke exhaust pipe again, and the temperature sensor detects the passing smoke in the process; and the motor and the bevel gear reversing transmission structure drive the turbine type air inlet auxiliary assembly and the conical opening cleaning cover to work, so that the purposes of flue gas flow speed control and temperature sensor sensing head cleaning are achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of aluminum electrolysis cells, and in particular to a device and method for monitoring the flue gas temperature of an aluminum electrolysis cell. Background Art

[0002] During aluminum production, an aluminum electrolytic cell exhaust gas temperature monitoring device monitors exhaust gas temperature changes in real time to ensure compliance with environmental standards and reduce harmful gas emissions. Furthermore, an abnormally high exhaust gas temperature may indicate overheating or malfunction in the aluminum electrolytic cell. Early warning can prevent equipment damage and safety incidents, ensuring production safety. The device primarily consists of a sensor, a signal acquisition unit, a data transmission system, and a display and control module. The sensor, typically an infrared thermometer, thermocouple, or infrared radiation thermometer, is installed at a strategic location in the exhaust duct or outlet, ensuring stable operation in high-temperature and corrosive environments. The signal acquisition unit converts the sensor's analog signal into a digital signal, 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 exhaust gas temperature in real time, set alarm thresholds, and automatically adjust the exhaust system or issue an alarm to ensure the exhaust gas temperature remains within a safe range. Currently, the flue gas from aluminum electrolysis cells is characterized by high flow and high heat dissipation. When infrared thermometers, thermocouples, or infrared radiation thermometers are installed in the exhaust duct or outlet of the cell, the high-velocity flue gas flows directly through the sensing area. This high-velocity flue gas exhibits strong turbulent flow characteristics. When the high-velocity flue gas impacts the sensor's sensing end in the form of irregular eddies, a dynamic boundary layer forms on the sensor surface. This fluid disturbance not only changes the local heat transfer coefficient but also causes nonlinear heat exchange between the sensor and the flue gas. Especially in narrow areas of the exhaust duct, the Venturi effect caused by the sudden increase in flow rate further exacerbates the uneven temperature distribution, making it difficult for the sensor to capture a representative average temperature value. Furthermore, alumina particles and fluoride aerosols suspended in the aluminum electrolysis flue gas gradually deposit on the sensor surface, forming a porous insulation layer. As the production cycle increases, the "temperature decay" phenomenon caused by pollutant accumulation will continuously deteriorate measurement accuracy. Summary of the Invention

[0003] The purpose of the present invention is to provide a device and method for monitoring the flue gas temperature of an aluminum electrolytic cell, which utilizes an F-type dual-channel front air intake head, a casing and an F-type dual-channel rear exhaust head to form a diversion channel on the exhaust pipe of the aluminum electrolytic cell, so that the flue gas passes through the front air intake head, the casing and the rear exhaust head in sequence and returns to the exhaust pipe. During this process, the temperature sensor detects the passing flue gas, and the motor and the bevel gear reversing transmission structure drive the turbine-type intake auxiliary assembly and the cone mouth cleaning hood to achieve the purpose of flue gas flow rate control and temperature sensor sensing head cleaning, thereby solving the problems raised in the above-mentioned background technology.

[0004] To achieve the above-mentioned object, the present invention provides the following technical solution: a device for monitoring the flue gas temperature of an aluminum electrolysis cell, comprising: The casing comprises two F-type dual-channel front air intake heads and two F-type dual-channel rear exhaust heads respectively installed on the left and right outer walls of the casing; a Venturi-type air guide cavity for connecting the F-type dual-channel front air intake head and the F-type dual-channel rear exhaust head in the same X-axis direction is provided inside the casing; temperature sensors are installed on both sides of the top of the casing; the sensing heads of the temperature sensors extend into the Venturi-type air guide cavity; a turbine-type air intake auxiliary assembly connected to the Venturi-type air guide cavity is installed inside the casing on one side of the F-type dual-channel front air intake head; a vertical shaft is rotatably installed inside the Venturi-type air guide cavity; a conical cleaning cover for contacting the outer surface of the temperature sensor sensing head is fixed on the top of the vertical shaft; a bevel gear reversing transmission structure for maintaining power connection is installed between the vertical shaft and the turbine-type air intake auxiliary assembly; The support is fixed at the bottom end of the casing, and a linear gear transmission group 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 end of the support.

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

[0006] Preferably, two symmetrical auxiliary air intake cavities are provided on the outer wall of the casing on one side close to the F-type dual-channel front air intake head, and the auxiliary air intake cavities are used to connect the F-type dual-channel front air intake head and the pump air casing.

[0007] Preferably, an arc-shaped recess is provided at the top end of the exhaust pipe, and the curvature of the arc-shaped recess is equal to the radius of the middle section of the Venturi-type air guide cavity.

[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 rotating shaft away from the compressor turbine, and the driven bevel gear and the driving bevel gear are meshed with each other.

[0009] Preferably, the outer peripheral surface of the conical cleaning cover is provided with a hollow portion, and the bottom of the conical cleaning cover is integrally formed with a plurality of annular scraping strips with equal spacing, the top of the scraping strips extends vertically upward, and one side of the scraping strips contacts the outer surface of the sensing head of the temperature sensor.

[0010] Preferably, a cone cavity for the cone cleaning cover to rotate is provided on one side of the interior of the housing, and the top end of the vertical shaft extends upward into the cone cavity.

[0011] Preferably, the linear gear transmission group includes a primary gear plate rotatably mounted at the center position inside the support, secondary gears rotatably mounted inside the support on both sides of the primary gear plate, and a central gear fixed at the bottom end of the vertical shaft, and the central gear, secondary gear, and primary gear plate are meshed in sequence.

[0012] Preferably, a sinking cavity is provided inside the support for the central gear, the secondary gear and the primary gear plate to rotate, and the bottom end of the vertical shaft extends into the sinking cavity.

[0013] The present invention also provides a method for monitoring the flue gas temperature of an aluminum electrolysis cell, such as the above-mentioned device for monitoring the flue gas temperature of an aluminum electrolysis cell, comprising the following steps: S101: Install an F-type dual-channel front air intake head and an F-type dual-channel rear exhaust head into the exhaust pipe of the aluminum electrolytic cell, so that the installation direction of the F-type dual-channel front air intake head, the housing, and the F-type dual-channel rear exhaust head is parallel to the extension direction of the exhaust pipe of the aluminum electrolytic cell. A portion of the high-speed flue gas in the exhaust pipe of the aluminum electrolytic cell is separated and enters the housing through the F-type dual-channel front air intake head, and then passes through the sensing head of the temperature sensor and the F-type dual-channel rear exhaust head and is re-merged into the exhaust pipe of the aluminum electrolytic cell; S102: When the airflow enters the casing, the temperature sensor measures the temperature of the flue gas. The temperature data collected by the temperature sensor is transmitted to the monitoring system or control center in real time for analysis and judgment by the operator. S103: When the staff turns on the motor to work, the motor's drive shaft directly drives one vertical shaft to rotate, and the other vertical shaft is driven to rotate by the linear gear transmission group. Then, the vertical shaft uses the bevel gear reversing transmission structure to drive the turbine-type air intake auxiliary assembly and the cone-shaped cleaning hood to work. The turbine-type air intake auxiliary assembly adjusts the flow rate of the flue gas to ensure that the airflow reaches the preset flow rate range when passing through the temperature sensor area, and the cone-shaped cleaning hood removes sediment, pollutants and dust on the surface of the temperature sensor's sensing head and its vicinity.

[0014] Compared with the prior art, the present invention has the following beneficial effects: The present invention provides an aluminum electrolytic cell flue gas temperature monitoring device and method. The device and method are provided with an F-type dual-channel front air intake head, a casing, an F-type dual-channel rear exhaust head, a temperature sensor, a turbine-type air intake auxiliary assembly, and a cone-shaped cleaning cover. The F-type dual-channel front air intake head, the casing, and the F-type dual-channel rear exhaust head form a branch channel on the exhaust pipe of the aluminum electrolytic cell, so that the flue gas passes through the front air intake head, the casing, and the rear exhaust head in sequence and returns to the exhaust pipe. In this process, the temperature sensor detects the passing flue gas, and the motor, The bevel gear reversing transmission structure drives the turbine-type air intake auxiliary assembly and the cone cleaning cover to achieve the purpose of flue gas flow rate control and temperature sensor sensing head cleaning; the diverter channel design decomposes the high-speed airflow of the main flue of the aluminum electrolytic cell into two controllable flow states through the diversion effect of two F-type dual-channel front air intake heads. The turbine-type air intake auxiliary assembly forms an adjustable negative pressure adsorption effect under the drive of the motor and the bevel gear reversing transmission structure. By changing the speed of the turbine blades, the flow distribution of the flue gas in the diverter channel is actively controlled, effectively reducing the sensor contact area. The shear stress of the airflow 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 temperature sensor surface, making the heat transfer process closer to a steady-state heat transfer model, thereby improving the authenticity and repeatability of temperature sensing. Secondly, the symmetrical layout of the front air intake and rear exhaust headers creates a Venturi effect compensation mechanism, which not only avoids the excessive pressure drop loss in the traditional single-channel acceleration section, but also weakens the interference of sudden changes in flue gas velocity on the temperature field through the energy dissipation of the diverter channel. This self-balancing fluid characteristic prolongs the gas residence time in the sensor contact area. Finally, the rotary sweeping motion of the conical cleaning hood utilizes the high-speed rotating cleaning edge to form periodic contact with the sensor sensing end, directly stripping away the aluminum oxide crust and fluoride crystals attached to the sensitive element surface. At the aerodynamic assistance level, the directional airflow generated by the turbine couples with the rotation trajectory of the cleaning hood to form a localized high-pressure air curtain effect, which not only prevents the secondary deposition of new contaminants during cleaning intervals but also removes residual particles after cleaning, fundamentally solving the temperature decay problem caused by the accumulation of contaminant layers in traditional fixed sensors. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the main structure of the present invention; Figure 2 Schematic diagram of the three-dimensional structure of the present invention Figure 1 ; Figure 3 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 three-dimensional structure of the present invention; Figure 5 It is a schematic diagram of the three-dimensional cross-sectional structure of the present invention; Figure 6 This is a schematic diagram of the main cross-sectional structure of the present invention; Figure 7 For the present invention Figure 5 A in the middle is an enlarged structural diagram; Figure 8 This is a schematic diagram of the three-dimensional structure of a turbine-type air intake auxiliary assembly according to the second embodiment of the present invention; Figure 9 This is a schematic diagram of the cross-sectional structure of the support according to the third embodiment of the present invention.

[0016] In the figure: 1. Casing; 101. Venturi-type air guide chamber; 102. Auxiliary 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 air intake auxiliary assembly; 501. Pump air casing; 502. Exhaust pipe; 503. Compressor turbine; 504. Rotating shaft; 6. Support; 601. Sinking chamber; 7. Motor; 8. Bevel gear reversing transmission structure; 801. Driven bevel gear; 802. Driving bevel gear; 9. Conical cleaning cover; 901. Hollow part; 902. Scraper; 10. Linear gear transmission group; 1001. Primary gear plate; 1002. Secondary gear; 1003. Center gear; 11. Vertical shaft. DETAILED DESCRIPTION

[0017] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0018] Embodiment 1, by Figures 1 to 6 The present invention includes a casing 1, on the left and right outer walls of the casing 1 are respectively installed two F-type dual-channel front air intake heads 2 and two F-type dual-channel rear exhaust heads 3, and the interior of the casing 1 is provided with a Venturi-type air guide cavity 101 for connecting the F-type dual-channel front air intake heads 2 and the F-type dual-channel rear exhaust heads 3 in the same X-axis direction. The F-type dual-channel front air intake heads 2 at the air intake position of the casing 1 can effectively guide and divert the exhaust airflow, and through the dual-channel layout, not only can the distribution area of ​​the airflow be increased, but also the uniform introduction of gas can be achieved, reducing local pressure differences and turbulence, thereby reducing the instability of the airflow; The F-type dual-channel rear exhaust head 3 efficiently discharges the exhaust gas, reducing the retention and backlog of gas in the system. The symmetrical distribution of the two F-type dual-channel rear exhaust heads 3 is used to disperse the exhaust pressure, reduce the exhaust resistance, and reduce the reverse interference of the airflow, thereby maintaining the continuity and stability of the system's airflow; 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 cavity 101; A turbine-type air intake auxiliary assembly 5 connected to a Venturi-type air guide chamber 101 is installed inside the casing 1 on one side of the F-type dual-channel front air intake head 2. A vertical shaft 11 is rotatably installed inside the Venturi-type air guide chamber 101. A conical cleaning cover 9 is fixed to the top of the vertical shaft 11 for contacting the outer surface of the sensing head of the temperature sensor 4. A bevel gear reversing transmission structure 8 is installed between the vertical shaft 11 and the turbine-type air intake auxiliary assembly 5 to maintain power connection. The support 6 is fixed to the bottom end of the casing 1. A linear gear transmission group 10 for connecting two vertical shafts 11 in the Y-axis direction is installed inside the support 6. 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.

[0019] A method for monitoring the flue gas temperature of an aluminum electrolysis cell according to this embodiment, such as the above-mentioned device for monitoring the flue gas temperature of an aluminum electrolysis cell, comprises the following steps: S101: Install the F-type dual-channel front air intake head 2 and the F-type dual-channel rear exhaust head 3 into the exhaust pipe of the aluminum electrolytic cell, so that the installation direction of the F-type dual-channel front air intake 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 electrolytic cell. A portion of the high-speed flue gas in the exhaust pipe of the aluminum electrolytic cell is separated and enters the housing 1 through the F-type dual-channel front air intake head 2, and then passes through the sensing head of the temperature sensor 4 and the F-type dual-channel rear exhaust head 3 and is re-merged into the exhaust pipe of the aluminum electrolytic cell; S102: When the airflow enters the casing 1, the temperature sensor 4 measures the temperature of the flue gas. The temperature data collected by the temperature sensor 4 is transmitted in real time to the monitoring system or control center for analysis and judgment by the operator. S103: The staff turns on the motor 7 to work, and the driving 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. 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 cover 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 a preset flow rate range when passing through the temperature sensor 4 area, and the cone-shaped cleaning cover 9 removes sediment, pollutants and dust on the surface of the sensing head of the temperature sensor 4 and its vicinity.

[0020] Example 2, based on Example 1, Figure 7 and Figure 8 The turbine-type air intake auxiliary assembly 5 includes a pump housing 501 fixed to one side of the interior of the casing 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 at one side of the top end of the pump housing 501. The top end of the exhaust pipe 502 extends upward to the interior of the Venturi-type air guide chamber 101. Two symmetrical auxiliary air intake cavities 102 are provided on the outer wall of the housing 1 near the F-type dual-channel front air intake head 2. The auxiliary air intake cavities 102 are used to connect the F-type dual-channel front air intake head 2 and the pump air housing 501. The top of the exhaust pipe 502 is provided with an arc-shaped notch, the curvature of which is equal to the mid-section radius of the Venturi-type air guide cavity 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 installed at the end of the rotating shaft 504 away from the compressor turbine 503. The driven bevel gear 801 and the driving bevel gear 802 are meshed with each other. The motor 7 and the linear gear transmission group 10 are used to drive the vertical shafts 11 in the two casings 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 is used to turn the F-type double The flue gas in the branch of the channel front air intake head 2 is pressed into the exhaust pipe 502 through the auxiliary air intake chamber 102, and is sent to the Venturi-type air guide chamber 101 through the exhaust pipe 502 for detection by the temperature sensor 4. Therefore, when the flue gas flow rate in the Venturi-type air guide chamber 101 fluctuates, the negative pressure adsorption intensity is adjusted to balance the pressure difference in the detection channel, prevent flue gas backflow or insufficient flow, and ensure that the air flow has sufficient flow rate when passing through the temperature sensor 4 area, avoid temperature measurement deviation caused by too slow air flow, and adapt to different working conditions; The outer peripheral surface of the conical cleaning cover 9 is provided with a hollow portion 901, and the bottom of the conical cleaning cover 9 is integrally formed with a plurality of annular scrapers 902 with equal spacing. The top end of the scraper 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 for the conical cleaning cover 9 to rotate is provided on one side of the interior of the casing 1, and the top end of the vertical shaft 11 extends upward into the conical cavity. When the conical cleaning cover 9 is driven to rotate by the vertical shaft 11, the hollow portion 901 allows the flue gas to pass through, and the scraper 902 contacts the outer surface of the sensing head of the temperature sensor 4 to remove sediment, dust and impurities on the sensor surface and its vicinity, keep the sensor clean, and improve the accuracy of the measurement.

[0021] Example 3, based on Example 2, Figure 9The linear gear transmission group 10 includes a primary gear plate 1001 rotatably mounted at the center position of the support 6, secondary gears 1002 rotatably mounted inside the support 6 on both sides of the primary gear plate 1001, and a central gear 1003 fixed to the bottom end of the vertical shaft 11. The central gear 1003, the secondary gear 1002, and the primary gear plate 1001 are meshed in sequence. The support 6 is provided with a sinking cavity 601 for the central gear 1003, the secondary gear 1002, and the primary gear plate 1001 to rotate. The bottom end of the vertical shaft 11 extends to the sinking cavity. In 601, when the two vertical shafts 11 are driven to rotate by the motor 7 and the linear gear transmission group 10, the driving shaft of the motor 7 directly drives one of the vertical shafts 11 to rotate, and then the vertical shaft 11 drives the first-stage gear plate 1001 to rotate through the central gear 1003 and the second-stage gear 1002 in turn, and the other vertical shaft 11 continues to be driven to rotate by the second-stage gear 1002 and the central gear 1003 on the other side of the sinking cavity 601, so as to enable the turbine-type intake auxiliary assembly 5 and the cone-mouth cleaning cover 9 in the two housings 1 to share a support 6, thereby ensuring the stable operation of the device.

[0022] When the embodiment of the present application is used, the staff first installs the F-type dual-channel front air intake head 2 and the F-type dual-channel rear exhaust head 3 into the exhaust pipe of the aluminum electrolytic cell, wherein the installation direction of the F-type dual-channel front air intake 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 electrolytic cell. Then, a part of the high-speed flue gas flow in the exhaust pipe of the aluminum electrolytic cell is separated and enters the housing 1 through the F-type dual-channel front air intake head 2. At this time, the flue gas flow rate slows down, reducing the formation of turbulence and eddy currents, so as to ensure that the temperature field of the flue gas when passing through the temperature sensor 4 area is as low as possible. The flue gas flows uniformly, and then this part of the flue gas flows through the induction head of the temperature sensor 4 and the F-type dual-channel rear exhaust head 3 and re-enters the exhaust pipe of the aluminum electrolysis cell; in the process of the airflow entering the casing 1, due to the buffering and uniformity treatment of the airflow after the front section, the temperature data measured by the temperature sensor 4 is highly representative, reflecting the actual temperature condition of the exhaust gas; the staff turns on the motor 7 to work, and the driving shaft of the motor 7 directly drives a 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 the bevel gear The wheel reversing transmission structure 8 drives the turbine-type air intake auxiliary assembly 5 and the cone-shaped cleaning cover 9 to work. During this process, the rotation speed of the turbine-type air intake auxiliary assembly 5 and the cone-shaped cleaning cover 9 is proportional to the rotation speed of the motor 7. The function of the turbine-type air intake auxiliary assembly 5 is to adjust the flow rate of the flue gas to ensure that the airflow reaches a preset flow rate range when passing through the temperature sensor 4 area. By adjusting the airflow speed, the measurement error caused by excessive airflow is effectively avoided, and the temperature deviation caused by excessive airflow is also prevented, ensuring that the device can maintain good detection conditions under different working conditions. The cone-shaped cleaning cover 9 is driven by the motor 7, the bevel gear reversing transmission structure 8, and the vertical shaft 11 to remove sediment, contaminants and dust on the surface of the sensing head of the temperature sensor 4 and its vicinity to prevent these impurities from affecting the measurement accuracy of the temperature sensor. In this way, by utilizing the 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 the 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 analysis and judgment by the operator.

[0023] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0024] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A device for monitoring the flue gas temperature of an aluminum electrolysis cell, characterized in that: include: A casing (1), wherein two F-type dual-channel front air intake heads (2) and two F-type dual-channel rear exhaust heads (3) are respectively installed on the left and right outer walls of the casing (1), a Venturi-type air guide cavity (101) for connecting the F-type dual-channel front air intake heads (2) and the F-type dual-channel rear exhaust heads (3) in the same X-axis direction is provided inside the casing (1), temperature sensors (4) are installed on both sides of the top of the casing (1), and the sensing heads of the temperature sensors (4) extend into the Venturi-type air guide cavity (101), A turbine-type air intake auxiliary assembly (5) communicating with a Venturi-type air guide chamber (101) is installed inside the housing (1) on one side of the F-type dual-channel front air intake head (2); a vertical shaft (11) is rotatably installed inside the Venturi-type air guide chamber (101); a cone-shaped cleaning cover (9) for contacting the outer surface of the sensing head of the temperature sensor (4) is fixed to 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); A support (6) is fixed to the bottom end of the housing (1), a linear gear transmission group (10) for connecting two vertical shafts (11) in the Y-axis direction is installed inside the support (6), 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 device for monitoring the flue gas temperature of an aluminum electrolysis cell according to claim 1, wherein: The turbine-type air intake auxiliary assembly (5) comprises a pump air housing (501) fixed to one side of the interior of the casing (1), a rotating shaft (504) rotatably mounted inside the pump air housing (501), a compressor turbine (503) fixed to one end of the rotating shaft (504), and an exhaust pipe (502) integrally formed at one side of the top end of the pump air housing (501), wherein the top end of the exhaust pipe (502) extends upward to the interior of the Venturi-type air guide cavity (101).

3. The device for monitoring the flue gas temperature of an aluminum electrolysis cell according to claim 2, wherein: Two symmetrical auxiliary air intake cavities (102) are provided on an outer wall of the housing (1) on one side close to the F-type dual-channel front air intake head (2). The auxiliary air intake cavities (102) are used to connect the F-type dual-channel front air intake head (2) and the pump housing (501).

4. The device for monitoring the flue gas temperature of an aluminum electrolysis cell according to claim 2, wherein: The top end of the exhaust pipe (502) is provided with an arc-shaped recess, and the curvature of the arc-shaped recess is equal to the radius of the middle section of the Venturi-type air guide cavity (101).

5. The device for monitoring the flue gas temperature of an aluminum electrolysis cell according to claim 2, wherein: The bevel gear reversing transmission structure (8) comprises a driving bevel gear (802) fixed to one end of the surface of the vertical shaft (11) and a driven bevel gear (801) installed at one end of the rotating shaft (504) away from the compressor turbine (503), wherein the driven bevel gear (801) and the driving bevel gear (802) are meshed with each other.

6. The device for monitoring the flue gas temperature of an aluminum electrolysis cell according to claim 1, wherein: The outer peripheral surface of the cone-mouth cleaning cover (9) is provided with a hollow portion (901), and the bottom of the cone-mouth cleaning cover (9) is integrally formed with a plurality of annular scraping strips (902) with equal spacing, the top of the scraping strip (902) vertically extending upward, and one side of the scraping strip (902) contacts the outer surface of the sensing head of the temperature sensor (4).

7. The device for monitoring the flue gas temperature of an aluminum electrolysis cell according to claim 6, characterized in that: A cone cavity for the cone cleaning cover (9) to rotate is provided on one side of the interior of the housing (1), and the top end of the vertical shaft (11) extends upward into the cone cavity.

8. The device for monitoring the flue gas temperature of an aluminum electrolysis cell according to claim 5, characterized in that: The linear gear transmission group (10) comprises a primary gear plate (1001) rotatably mounted at the center position inside the support (6), secondary gears (1002) rotatably mounted inside the support (6) on both sides of the primary gear plate (1001), and a central gear (1003) fixed at the bottom end of the vertical shaft (11). The central gear (1003), the secondary gear (1002), and the primary gear plate (1001) are meshed in sequence.

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

10. A method for monitoring the flue gas temperature of an aluminum electrolysis cell, comprising the device for monitoring the flue gas temperature of an aluminum electrolysis cell according to any one of claims 1 to 9, characterized in that: The following steps are involved: S101: Install the F-type dual-channel front air intake head (2) and the F-type dual-channel rear exhaust head (3) into the exhaust pipe of the aluminum electrolytic cell, so that the installation direction of the F-type dual-channel front air intake 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 electrolytic cell, and a portion of the high-speed flue gas flow in the exhaust pipe of the aluminum electrolytic cell is separated and enters the housing (1) through the F-type dual-channel front air intake head (2), and is re-merged into the exhaust pipe of the aluminum electrolytic cell through the sensing head of the temperature sensor (4) and the F-type dual-channel rear exhaust head (3); S102: When the airflow enters the casing (1), the temperature sensor (4) measures the temperature data of the flue gas. The temperature data collected by the temperature sensor (4) is transmitted in real time to the monitoring system or the control center for analysis and judgment by the operator; S103: When the staff turns on 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) drives the turbine-type air intake auxiliary assembly (5) and the cone-shaped cleaning cover (9) to work by using the bevel gear reversing transmission structure (8). The turbine-type air intake auxiliary assembly (5) adjusts the flow rate of the flue gas to ensure that the air flow reaches the preset flow rate range when passing through the temperature sensor (4) area, and the cone-shaped cleaning cover (9) removes sediments, pollutants and dust on the surface of the sensing head of the temperature sensor (4) and its vicinity.

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