Method and device for measuring liquid level of high-temperature molten liquid

Abstract

The invention relates to the field of ferrous metallurgy and non-ferrous metallurgy, in particular to a high-temperature molten liquid level measuring method and measuring device.The high-temperature molten liquid level measuring device comprises a monitoring assembly and an analyzing assembly.The monitoring assembly comprises a high-temperature container used for storing high-temperature molten liquid and a measuring pipe partially inserted into the high-temperature molten liquid; the thermal imager is arranged above the measuring tube, a plurality of steps used for calibrating positions are arranged on the inner wall of the measuring tube in the length direction of the measuring tube, and the thermal imager is used for monitoring thermal image information of the inner surface of the measuring tube; the analysis assembly is used for receiving information of the monitoring assembly, and the analysis assembly combines information transmitted by the thermal imager and information of the measuring pipe to analyze and obtain the liquid level position of the high-temperature molten liquid in the high-temperature container. The device has the effect of continuously measuring the liquid level of the high-temperature molten liquid in the ferrous metallurgy and nonferrous metallurgy processes.

Description

Technical Field

[0001] This application relates to the fields of iron and steel metallurgy and non-ferrous metallurgy, and particularly relates to a method and device for measuring the liquid level of a high-temperature molten liquid. Background Art

[0002] During the production processes of iron and steel metallurgy and non-ferrous metallurgy, the liquid level of a high-temperature molten liquid is a key parameter for controlling product quality. Taking the continuous casting production in iron and steel metallurgy as an example, the control of the molten steel level is an important means to ensure stable pouring and solidification control and avoid slag entrainment. During the continuous casting process, there is a layer of protective slag covering the surface of the molten steel, making it difficult to directly measure the molten steel level. In the production process, the weighing method is often used to indirectly infer the molten steel level, resulting in a large error. In the prior art, there is a device and method for measuring the molten steel level. In the measuring device, the measuring rod is prone to react with the protective slag to form a slag shell during the measurement process, and the slag shell will block the image measuring instrument, causing a large measurement error; moreover, this method requires the measuring rod to be pulled out, making it difficult to continuously monitor the change of the liquid level.

[0003] In addition, taking the sponge titanium reduction reaction in non-ferrous metallurgy as an example, during the reduction period, the liquid level height in the reactor is a key parameter affecting the feeding speed and the removal of molten magnesium chloride during the entire reduction process, and has an important impact on product quality and production efficiency. The reduction reactor is sealed, and the temperature in the reactor is above 800°C, making it difficult to measure the liquid level height in the reactor by conventional means. For this part, the prior art discloses a device for measuring the initial liquid level of the sponge titanium reduction reaction, which uses the principle of circuit conduction in contact with the molten metal liquid to form a loop to achieve liquid level detection. Therefore, the main problem is that it is difficult to continuously monitor the change of the liquid level. Summary of the Invention

[0004] In order to achieve continuous measurement of the liquid level of a high-temperature molten liquid during the processes of iron and steel metallurgy and non-ferrous metallurgy, this application provides a method and device for measuring the liquid level of a high-temperature molten liquid.

[0005] The method and device for measuring the liquid level of a high-temperature molten liquid provided by this application adopt the following technical solutions:

[0006] A device for measuring the liquid level of a high-temperature molten liquid includes: a monitoring component, including a high-temperature container for storing the high-temperature molten liquid, a measuring tube partially inserted into the high-temperature molten liquid, and an infrared thermal imager disposed above the measuring tube;

[0007] An analysis component for receiving the information of the monitoring component. The analysis component combines the information transmitted by the infrared thermal imager and the information of the measuring tube to analyze and obtain the liquid level position of the high-temperature molten liquid in the high-temperature container;

[0008] Among them, a plurality of steps for calibrating positions are provided along the length direction of the inner wall of the measuring tube. The steps are arranged inside the measuring tube, and the thermal imager is used to monitor the thermal image information of the inner surface of the measuring tube.

[0009] By adopting the above technical solution, the thermal imager can directly reflect the liquid level position by monitoring the temperature distribution on the inner surface of the measuring tube. For example, there is a significant temperature difference between the liquid region and the gas region. The steps in the measuring tube serve as physical calibration references to provide depth positioning. The analysis component can automatically calibrate the measurement deviation caused by temperature fluctuations or equipment thermal expansion by comparing the temperature gradient changes at different steps, improving long-term stability. The thermal imager does not need to directly contact the high-temperature molten liquid, avoiding damage to the sensor caused by high temperature and corrosive media and extending the equipment life. At the same time, the infrared imaging technology of the thermal imager can achieve continuous monitoring. Combining with the position information calibrated by the steps, it can capture the liquid level fluctuation trend in real time. The analysis component can establish a temperature-position mapping model to identify liquid level mutations in advance, such as rapid decline or local overheating, and trigger an alarm to avoid production accidents.

[0010] Preferably, the inner surface of the measuring tube is provided with multiple inclined surfaces, and the steps are arranged in the middle of every two adjacent inclined surfaces. One end of the measuring tube is a closed end and the other end is an open end. The thickness of the middle section of the measuring tube gradually decreases from the closed end to the open end of the measuring tube.

[0011] By adopting the above technical solution, the multiple inclined surfaces on the inner surface optimize the heat conduction path by expanding the contact area, making the temperature gradient between the liquid region and the gas region more obvious; the design of the gradually changing thickness of the measuring tube enables the thick wall at the closed end to resist high-temperature creep and the thin wall at the open end to reduce thermal stress concentration, effectively compensating for the thermal expansion difference and avoiding structural cracking.

[0012] Preferably, the vertical distance between every two adjacent steps is the same, and the number of steps is one more than the number of inclined surfaces.

[0013] By adopting the above technical solution, the equidistant steps form uniformly distributed temperature calibration reference points. The thermal imager can quickly establish a linear interpolation model by identifying the temperature gradient changes between adjacent steps, eliminating the non-linear error caused by the spacing difference. At the same time, the number of steps enables the temperature response of each inclined surface region to be accurately constrained by the step reference points on both sides, avoiding signal confusion caused by structural misalignment.

[0014] Preferably, the number of inclined surfaces is 2-10 segments. Vertical surfaces are provided at both the closed end and the open end of the measuring tube. The inner diameter of the measuring tube near the open end is larger than the inner diameter of the measuring tube near the closed end.

[0015] By adopting the above technical solution, the design of the 2-10 section inclined plane ensures the optimization of the heat conduction path while avoiding the structural complexity and increased manufacturing cost caused by excessive segmentation. Each inclined plane and the step cooperate to form a regular temperature gradient characteristic. The closed-end vertical plane serves as the high-temperature starting boundary, and the open-end vertical plane serves as the low-temperature reference. The additional vertical planes at the closed end and the open end not only provide a clear reference positioning point for the thermal imager but also enhance the overall structural stiffness of the measuring tube through the larger cross-sectional size of the open-end vertical plane, reducing the deformation risk caused by high-temperature creep.

[0016] Preferably, the thermal imager is perpendicular to the liquid level of the high-temperature molten liquid. Each step is within the scanning range of the thermal imager, and each inclined plane can be clearly imaged within the thermal imager.

[0017] By adopting the above technical solution, the vertical setting of the thermal imager and the liquid level eliminates the image distortion caused by the inclined viewing angle, ensuring that the temperature response signals of each step present a real spatial position relationship in the thermal image. The full-coverage scanning range design enables all steps and inclined planes to be within the effective field of view, avoiding monitoring blind spots caused by local occlusion or exceeding the measurement range.

[0018] Preferably, an installation component for fixedly installing the measuring tube is provided at one end of the high-temperature container away from the high-temperature molten liquid. The installation component includes a first installation part provided on the outer wall of the measuring tube and a second installation part used in cooperation with the first installation part. The first installation part and the second installation part are detachably connected.

[0019] By adopting the above technical solution, the first installation part provided on the outer wall of the measuring tube and the second installation part on the high-temperature container are quickly connected through a detachable structure. By adjusting the detachable structure, the insertion depth and perpendicularity of the measuring tube can also be adjusted to meet diverse requirements.

[0020] Preferably, after the first installation part and the second installation part are connected, the measuring tube is perpendicular to the molten liquid level.

[0021] A method for measuring the liquid level of a high-temperature molten liquid requires the use of a measuring device for the liquid level of a high-temperature molten liquid, including the steps of:

[0022] Vertically insert the measuring tube into the high-temperature molten liquid;

[0023] Place the closed end of the measuring tube below the liquid level, and at the same time, make the bottom ends of the multi-section inclined planes below the liquid level;

[0024] Use the analysis module to analyze the thermal image information measured by the thermal imager;

[0025] Complete the real-time measurement of the liquid level.

[0026] By adopting the above technical solution, the measuring tube vertically inserted into the high-temperature molten liquid ensures its strict perpendicularity to the liquid surface, avoiding the thermal image distortion caused by inclination, enabling the thermal imager to accurately obtain the temperature distribution image reflecting the law of heat conduction in the vertical direction, and laying a foundation for accurate liquid level measurement. Secondly, placing the closed end of the measuring tube and the bottom ends of multiple inclined planes below the liquid surface expands the contact area with the melt, optimizes the heat conduction path, forms an obvious temperature gradient between the liquid region and the gas region, and at the same time, the synergistic effect of the inclined plane and the step will generate a temperature inflection point at the step due to the sudden change of the heat conduction area, allowing the thermal imager to more clearly identify the liquid surface position. Moreover, the analysis module analyzes the thermal image information transmitted by the thermal imager in real time to achieve real-time measurement of the liquid level, can dynamically capture the instantaneous changes of the liquid level, and timely detect abnormal fluctuations of the liquid surface, such as rapid decline or local overheating, etc., so as to give an early warning and effectively avoid the occurrence of production accidents such as dry pot and overflow.

[0027] Preferably, the liquid level of the high-temperature molten liquid changes within the area corresponding to the multiple inclined planes.

[0028] By adopting the above technical solution, when the liquid level fluctuates within the area corresponding to the inclined plane, the inclination angle of the inclined plane and the optimized heat conduction path form a unique temperature distribution feature: when the interface between the liquid region and the gas region moves along the inclined plane, a continuously changing temperature gradient band will appear in the thermal image, and the temperature inflection point at the step provides an accurate positioning reference for this gradient band.

[0029] Preferably, the analysis module extracts the thermal image information measured by the thermal imager, extracts the temperature curve from the center to the edge of the measuring tube, solves the temperature gradient according to the temperature curve, finds the position where the temperature gradient changes sharply, and combines the calibration of the step to judge the liquid level of the high-temperature molten liquid.

[0030] By adopting the above technical solution, the system first extracts the continuous temperature curve from the center to the edge of the measuring tube from the thermal image obtained by the thermal imager, eliminates noise interference through mathematical fitting, and accurately restores the temperature distribution characteristics of the liquid region and the gas region; then calculates the temperature gradient based on the finite difference method, and uses the gradient threshold detection technology to quickly locate the position where the temperature changes sharply; finally, combines the physical calibration reference of the internal step of the measuring tube, and realizes the absolute position measurement of the liquid level by establishing the mapping relationship between the gradient change position and the step coordinates, eliminating the defect that the single temperature threshold method is easily affected by environmental radiation interference.

[0031] In summary, the present application includes at least one of the following beneficial technical effects:

[0032] 1. The thermal imager can visually reflect the liquid level position by monitoring the temperature distribution on the inner surface of the measuring tube. For example, there is a significant temperature difference between the liquid region and the gas region, and the steps inside the measuring tube serve as physical calibration references to provide depth positioning. By comparing the temperature gradient changes at different steps, the analysis component can automatically calibrate the measurement deviation caused by temperature fluctuations or equipment thermal expansion, improving long-term stability. The thermal imager does not need to directly contact the high-temperature molten liquid, avoiding damage to the sensor caused by high temperature and corrosive media and extending the equipment life. At the same time, the infrared imaging technology of the thermal imager can achieve continuous monitoring. Combining with the position information calibrated by the steps, it can capture the liquid level fluctuation trend in real time. The analysis component can establish a temperature-position mapping model to identify liquid level mutations in advance, such as rapid decline or local overheating, and trigger an alarm to avoid production accidents.

[0033] 2. Through the collaborative design of multiple inclined planes, steps, and gradually changing wall thickness in the measuring tube, the reliability and accuracy of high-temperature molten liquid level monitoring are significantly improved. Specifically, the multiple inclined planes on the inner surface optimize the heat conduction path by expanding the contact area, making the temperature gradient between the liquid region and the gas region more obvious. Combining with the temperature inflection point formed by the sudden change in heat conduction area at the steps, it provides dual positioning features for the thermal imager, enabling more precise liquid level identification. The gradually changing thickness design compensates for the thermal expansion difference effectively by having a thick wall at the closed end to resist high-temperature creep and a thin wall at the open end to reduce heat stress concentration, avoiding structural cracking. The geometric features of the inclined planes and steps also reduce slagging on the inner wall by utilizing the self-weight and flow scouring of the melt, enhancing the self-cleaning ability and maintaining long-term stable heat signal transmission. Description of the Drawings

[0034] Figure 1 is a schematic structural diagram showing the high-temperature molten liquid level measuring device in the embodiment of the present application;

[0035] Figure 2 is a graph showing the liquid level position and temperature obtained after analysis by the analysis module in the present application.

[0036] Description of the reference numerals: 1. High-temperature molten liquid; 2. Measuring tube; 3. Step; 4. Inclined plane; 5. Liquid level; 6. High-temperature container; 7. Thermal imager; 8. Analysis module. Detailed Embodiment

[0037] The following will further describe the present application in detail Figure 1-2 with reference to the attached drawings.

[0038] The embodiment of the present application discloses a method and a device for measuring the level of high-temperature molten liquid. Refer to Figure 1 and Figure 2, The measuring device for the liquid level of high-temperature molten liquid includes a monitoring component and an analysis component. The monitoring component includes a high-temperature container 6 for storing the high-temperature molten liquid 1, a measuring tube 2 partially inserted into the high-temperature molten liquid 1, and an infrared thermal imager 7 arranged above the measuring tube 2. A plurality of steps 3 for calibrating positions are arranged in the length direction of the measuring tube 2. The steps 3 are arranged inside the measuring tube 2, and the infrared thermal imager 7 is used to monitor the thermal image information of the inner surface of the measuring tube 2.

[0039] The inner surface of the measuring tube 2 is provided with multiple inclined surfaces 4. The steps 3 are arranged in the middle of every two adjacent inclined surfaces 4. One end of the measuring tube 2 is a closed end and the other end is an open end. The inner diameter of the middle section of the measuring tube 2 gradually decreases from the closed end to the open end of the measuring tube 2. Through the collaborative design of multiple inclined surfaces 4, steps 3 and gradually changing wall thickness in the measuring tube 2, the reliability and accuracy of monitoring the high-temperature molten liquid level 5 are significantly improved. Specifically, the multiple inclined surfaces 4 on the inner surface optimize the heat conduction path by expanding the contact area, making the temperature gradient between the liquid region and the gas region more obvious. Combined with the temperature inflection point generated at the steps 3 due to the sudden change in the heat conduction area, it provides double positioning features for the infrared thermal imager 7, realizing more precise identification of the liquid level 5. At the same time, the design of the gradually changing thickness of the measuring tube effectively compensates for the thermal expansion difference by means of the thick wall at the closed end resisting high-temperature creep and the thin wall at the open end reducing heat stress concentration, avoiding structural cracking.

[0040] The vertical distance between every two adjacent steps 3 is the same. The number of steps 3 = the number of inclined surfaces 4 + 1. The number of inclined surfaces 4 is 2 - 10 segments. Vertical surfaces are arranged at both the closed end and the open end of the measuring tube 2. The inner diameter of the measuring tube 2 near the open end is larger than the inner diameter of the measuring tube 2 near the closed end. The equidistant steps 3 form uniformly distributed temperature calibration reference points. The infrared thermal imager 7 can quickly establish a linear interpolation model by identifying the temperature gradient change between adjacent steps 3, eliminating the non-linear error caused by the spacing difference. The corresponding relationship between the number of steps 3 and the number of inclined surfaces 4, for example: n steps 3 correspond to n + 1 inclined surfaces 4, ensures that the temperature response in each inclined surface 4 region can be accurately constrained by the reference points of the steps 3 on both sides, avoiding signal confusion caused by structural misalignment. Simplify the complexity of the data analysis algorithm, without having to process the non-uniform interval non-linear compensation, enhance the regularity of the thermal image features, and enable the position of the liquid level 5 to be directly obtained through quick look-up table or gradient calculation.

[0041] The design of 2 - 10 segments of inclined surfaces 4 ensures the optimization of the heat conduction path while avoiding the structural complexity and increased manufacturing cost caused by excessive segmentation. Each inclined surface 4 and the steps 3 cooperate to form regular temperature gradient characteristics. The vertical surface at the closed end serves as the high-temperature starting boundary, and the vertical surface at the open end serves as the low-temperature reference. The additional vertical surfaces at the closed end and the open end not only provide clear reference positioning points for the infrared thermal imager 7, but also enhance the overall structural stiffness of the measuring tube 2 through the larger cross-sectional dimension of the vertical surface at the open end, reducing the deformation risk caused by high-temperature creep.

[0042] In a preferred embodiment, the thermal imager 7 is perpendicular to the liquid surface 5 of the high-temperature molten liquid 1. Each step 3 is within the scanning range of the thermal imager 7, and each inclined surface 4 can be clearly imaged within the thermal imager 7. The perpendicular arrangement of the thermal imager 7 to the liquid surface 5 eliminates image distortion caused by the tilt of the viewing angle, ensuring that the temperature response signals of each step 3 present a true spatial position relationship in the thermal image. The design of the full-coverage scanning range enables all steps 3 and inclined surfaces 4 to be within the effective field of view, avoiding monitoring blind spots caused by local occlusion or out-of-range, thereby completely capturing the full-cycle characteristics of the liquid surface 5 fluctuations and providing a complete temperature gradient data set for the analysis component.

[0043] In an alternative embodiment, an installation component for fixedly installing the measuring tube 2 is provided at one end of the high-temperature container 6 away from the high-temperature molten liquid 1. The installation component includes a first mounting member provided on the outer wall of the measuring tube 2 and a second mounting member used in cooperation with the first mounting member. The first mounting member and the second mounting member are detachably connected. Quick detachable connection can be achieved through flange bolts or clamps. The adjustable characteristics of the installation component, such as bolt spacing or clamp tightness, can flexibly adjust the insertion depth and perpendicularity of the measuring tube 2, simplify the on-site installation process, and also support the quick switching of multiple sets of measuring tubes 2 through standardized interfaces to meet diverse requirements.

[0044] Preferably, after the first mounting member and the second mounting member are connected, the measuring tube 2 is perpendicular to the molten liquid surface 5. This ensures that the temperature distribution image obtained by the thermal imager 7 truly reflects the heat conduction law in the vertical direction and eliminates the position distortion of the liquid surface 5 caused by tilt. The vertical structure enables the inclined surface 4 and the steps 3 inside the measuring tube 2 to uniformly contact the melt under the action of gravity, forming a symmetric temperature gradient field, enhancing the recognition of the liquid surface 5 position by the thermal imager 7. At the same time, it simplifies the data processing process, enabling the analysis component to directly establish a temperature-position mapping model based on the vertical coordinate system without complex angle compensation calculations.

[0045] The analysis component is used to receive the information of the monitoring component. The analysis component combines the information transmitted by the thermal imager 7 and the information of the measuring tube 2 to analyze and obtain the position of the liquid surface 5 of the high-temperature molten liquid 1 in the high-temperature container 6.

[0046] Referring to Figure 1 and Figure 2 , for the method of measuring the level of a high-temperature molten liquid, a measuring device for the level of a high-temperature molten liquid is required, including the steps:

[0047] S1 Vertically insert the measuring tube 2 into the high-temperature molten liquid 1.

[0048] Among them, the measuring tube 2 vertically inserted into the high-temperature molten liquid 1 ensures its strict perpendicularity to the liquid surface 5, avoiding the thermal image distortion caused by inclination, enabling the thermal imager 7 to accurately obtain the temperature distribution image reflecting the law of heat conduction in the vertical direction, and laying a foundation for accurate liquid level measurement.

[0049] S2 Place the closed end of the measuring tube 2 below the liquid surface 5, and at the same time make the bottom ends of the multi-segment inclined surfaces 4 located below the liquid surface 5.

[0050] It expands the contact area with the melt, optimizes the heat conduction path, forms an obvious temperature gradient between the liquid region and the gas region. At the same time, the synergistic effect of the inclined surface 4 and the step 3 will also generate a temperature inflection point at the step 3 due to the sudden change of the heat conduction area, enabling the thermal imager 7 to more clearly identify the position of the liquid surface 5.

[0051] S3 Use the analysis module 8 to analyze the thermal image information measured by the thermal imager 7.

[0052] Realize the real-time measurement of the liquid level, can dynamically capture the instantaneous changes of the liquid level, and timely detect the abnormal fluctuations of the liquid surface 5, such as rapid decline or local overheating, etc., so as to give early warnings and effectively avoid production accidents such as dry pot and overflow.

[0053] S4 Complete the real-time measurement of the liquid level.

[0054] Through the above method, when the liquid level fluctuates within the corresponding area of the inclined surface 4, the inclination angle of the inclined surface 4 and the optimized heat conduction path form a unique temperature distribution feature: when the interface between the liquid region and the gas region moves along the inclined surface 4, a continuously changing temperature gradient band will appear in the thermal image, and the temperature inflection point at the step 3 provides an accurate positioning reference for this gradient band, enabling the liquid level change to be converted into quantifiable thermal signal features, such as the slope of the gradient band and the offset of the inflection point position. The analysis module 8 can calculate the rising / falling rate and absolute position of the liquid level in real time by monitoring the dynamic evolution of these features. In addition, the multiple independent monitoring areas formed by the multi-segment inclined surface 4 can cover a larger liquid level change range, and the thermal response characteristics of each area are highly consistent, avoiding the monitoring blind area caused by the liquid level exceeding the range of a single inclined surface 4.

[0055] The analysis module 8 extracts the thermal image information measured by the thermal imager 7, analyzes and extracts the temperature curve from the center to the edge of the measuring tube 2, solves the temperature gradient according to the temperature curve, and finds the positions where the temperature gradient changes sharply. These positions correspond to the liquid level position and the position of the step 3 at the calibrated vertical direction position; when the system tests the liquid level at different positions, the temperature gradient characteristics corresponding to the liquid level position and the step 3 position are analyzed, and the liquid level position among the positions where the above temperature gradient changes sharply is determined according to these characteristics.

[0056] The implementation principle of the embodiments of this application is as follows: The thermal imager 7 monitors the temperature distribution on the inner surface of the measuring tube 2. For example, there is a significant temperature difference between the liquid region and the gas region, which can directly reflect the position of the liquid level 5. The step 3 in the measuring tube 2 serves as a physical calibration reference to provide depth positioning. By comparing the temperature gradient changes at different steps 3, the analysis component can automatically calibrate the measurement deviation caused by temperature fluctuations or equipment thermal expansion, improving long-term stability. The thermal imager 7 does not need to directly contact the high-temperature molten liquid 1, avoiding damage to the sensor caused by high temperature and corrosive media and extending the equipment life. At the same time, the infrared imaging technology of the thermal imager 7 can achieve continuous monitoring. Combining with the position information calibrated by the step 3, it can capture the fluctuation trend of the liquid level 5 in real time. The analysis component can establish a temperature-position mapping model to identify sudden changes in the liquid level 5 in advance, such as rapid decline or local overheating, and trigger an alarm to avoid production accidents.

[0057] The above are all the preferred embodiments of this application, and the protection scope of this application is not limited accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of this application should be covered within the protection scope of this application.

Claims

1. A measuring device for the liquid level of a high-temperature molten liquid, characterized in that, Comprising: A monitoring component, including a high-temperature container (6) for storing high-temperature molten liquid (1), a measuring tube (2) partially inserted into the high-temperature molten liquid (1), and an infrared thermal imager (7) disposed above the measuring tube (2); An analysis component for receiving information from the monitoring component, the analysis component combining the information transmitted by the infrared thermal imager (7) and the information of the measuring tube (2) to analyze and obtain the position of the liquid level (5) of the high-temperature molten liquid (1) in the high-temperature container (6); Wherein, a plurality of steps (3) for calibrating positions are provided along the length direction of the inner wall of the measuring tube (2), and the infrared thermal imager (7) is used to monitor the thermal image information of the inner surface of the measuring tube (2).

2. The measuring device for the liquid level of a high-temperature molten liquid according to claim 1, characterized in that, A plurality of inclined surfaces (4) are provided on the inner surface of the measuring tube (2), the steps (3) are arranged in the middle of every two adjacent inclined surfaces (4), one end of the measuring tube (2) is a closed end and the other end is an open end, and the thickness of the middle section of the measuring tube (2) gradually decreases from the closed end to the open end of the measuring tube (2).

3. The measuring device for the liquid level of a high-temperature molten liquid according to claim 2, wherein, The vertical distance between every two adjacent steps (3) is the same, and the number of steps (3) is one more than the number of inclined surfaces (4).

4. The measuring device for the liquid level of a high-temperature molten liquid according to claim 3, characterized in that, The number of the inclined surfaces (4) is from 2 to 10, vertical surfaces are provided at both the closed end and the open end of the measuring tube (2), and the inner diameter of the measuring tube (2) near the open end is larger than the inner diameter of the measuring tube (2) near the closed end.

5. The measuring device for the liquid level of high-temperature molten liquid according to claim 4, wherein The infrared thermal imager (7) is perpendicular to the liquid level (5) of the high-temperature molten liquid (1), each step (3) is within the scanning range of the infrared thermal imager (7), and each inclined surface (4) can be clearly imaged in the infrared thermal imager (7).

6. The measuring device for the liquid level of a high-temperature molten liquid according to claim 1, wherein, An installation component for fixedly installing the measuring tube (2) is provided at one end of the high-temperature container (6) away from the high-temperature molten liquid (1), the installation component includes a first installation part provided on the outer wall of the measuring tube (2) and a second installation part used in cooperation with the first installation part, and the first installation part and the second installation part are detachably connected.

7. The measuring device for the level of a high-temperature molten liquid according to claim 6, characterized in that, After the first installation part and the second installation part are connected, the measuring tube (2) is perpendicular to the molten liquid level (5).

8. A method for measuring the liquid level of a high-temperature molten liquid, which requires the use of the measuring device for the liquid level of a high-temperature molten liquid according to any one of claims 1-7, is characterized in that, Including steps: Vertically insert the measuring tube (2) into the high-temperature molten liquid (1); Place the closed end of the measuring tube (2) below the liquid level (5), and at the same time make the bottom ends of the plurality of inclined surfaces (4) below the liquid level (5); Use the analysis module (8) to analyze the thermal image information measured by the infrared thermal imager (7); Complete the real-time measurement of the liquid level.

9. The method for measuring the liquid level of a high-temperature molten liquid according to claim 8, characterized in that, The liquid level of the high-temperature molten liquid (1) changes in position within the corresponding regions of the plurality of inclined surfaces (4).

10. The method for measuring the liquid level of a high-temperature molten liquid according to claim 8, characterized in that, The analysis module (8) extracts the thermal image information measured by the infrared thermal imager (7), extracts the temperature curve from the center to the edge of the measuring tube (2), solves the temperature gradient according to the temperature curve, finds the position where the temperature gradient changes sharply, and judges the liquid level of the high-temperature molten liquid (1) in combination with the calibration of the steps (3).

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