Abstract

Inner wall temperature of ladle is closely related to the quality of steelmaking and control of steel-making tapping temperature. This article adopts a rotating platform to drive an infrared temperature sensor and a laser sensor to scan the temperature field distribution of the ladle inner wall at the hot repair station, where the scanning laser sensor obtains coordinates of each measured point. Because of measuring errors of infrared thermal radiation caused by emissivity uncertainty of the ladle inner wall surface, this article proposes a method for temperature measurement based on Monte Carlo model for effective emissivity correction of each measured point. In the model, we consider the ladle and fire baffle as a cavity. By calculation of the model, the effect of distance from the fire baffle to the ladle and the material surface emissivity of the ladle inner wall on the effective emissivity of the cavity are obtained. After that, the effective emissivity of each measured point is determined. Then the scanning temperature of each measured point is corrected to real temperature. By field measuring test and verification contrast, the results show that: the maximum absolute error of the method in this article is 4.7 °C, the minimum error is 0.6 °C, and the average error is less than 2.8 °C. The method in this article achieves high measurement accuracy and contributes to the control of metallurgical process based on temperature information.

Highlights

  • Inner wall temperature of ladle is closely related to the quality of steelmaking and control of steelmaking tapping temperature

  • The ladle inner wall temperature field measurement method in this article is tested in the field of Hubei Xinyegang Steel Co., Ltd. the effective emissivity εaD0 of each measured point are obtained by Monte Carlo calculation model

  • The method in this article has solved the uncertainty of effective emissivity for non-contact thermometry, with a high accuracy close to contact thermometry, the method is convenient for installation and maintenance of the inner wall temperature measurement of the ladle in the turnover process

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Summary

Measurement principle

In order to obtain the temperature of the ladle before it is filled with molten steel, the hot repair station is selected as the measuring position where the ladle is ready to holding molten steel and its position is relatively fixed. The infrared temperature sensor scans the inner wall of the ladle to obtain its temperature by the rotating platform. The platform drives the infrared temperature sensor and the laser sensor to obtain the temperature measuring data and distance between the scanning laser sensor and the measured point on the inner wall of the ladle. In order to build the coordinates of the measured points on the inner wall of the ladle, the scanning distance data need to be converted into the ladle coordinate system. This article establishes the measurement coordinate system and the ladle coordinate system respectively, according to the installation position parameters and the positioning parameters which obtained by the positioning laser sensors. The scanning distance and azimuth angles of each measured point are mapped into the ladle coordinate ­system[17,18,19,20]. The temperature distribution of the ladle inner wall is obtained

Positioning lasers
Infrared temperature sensor
Monte Carlo effective emissivity calculation model
Steel jacket Safety lining Working lining
Conclusion
Additional information
Full Text
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