Device for continuous temperature measurement of molten steel in the undish using optical fiber and infra-red pyrometer

Abstract

The system developed for the continuous temperature measurement of molten metal (1), like in the case of the continuous casting machine tundish (2), uses an optical process to control the continuous casting machine speed, and it consists of an optical infra-red sensor (8) protected by a cooled jacket (30). This two-color sensor (8), fitted with optical fiber (9) and an optical signal converter (10), is focused inside a high thermal and light conductivity ceramic tube (15), and it enables accurate temperature readings of molten steel (1) in the tundish (2). This practical device avoids the inconvenience of the method currently being used. It reduces the operator's high temperature exposure time, lowers maintenance downtime, minimizes the operating risks, improves safety and enables fast, simple replacement, resulting in improved slab quality and, as a consequence, lower costs.

Description

technical field [0001] The invention is an improvement to the continuous measurement system of molten steel temperature using an optical method. Background technique [0002] Over the past decades, steel mills have undergone continuous improvements in terms of productivity and energy conservation controls, while at the same time taking an environmental standpoint. [0003] Considering that steel production processes require strict temperature control, especially at high temperatures, temperature measurement plays a vital role in achieving the conditions required for proper production process development. Chemical reactions between gases and solid matter in blast furnaces and refining furnaces are examples of process stages where temperature control is essential to obtain the best results in terms of product quality. [0004] Considering that measuring temperature in these processes is very difficult as it involves handling molten steel in converters, ladles and continuous c...

AI Technical Summary

Problems solved by technology

However, it faces specific technical and operational issues such as: high temperature (>200°C) in the body of the infrared sensor; need to monitor temperature to protect the sensor; type of sensor protection and mounting box; stainless steel tubing required to secure the sensor Makes the application suitable and makes the ceramic device easier to replace; ideal for cooling the sensor and optical fiber without affecting the measurement; accurate determination of the distance between the sensor and the bottom of the ceramic tube; the definition of the inner diameter of the ceramic tube for accurate measurement; appropriate The length of the ceramic tube; the appearance and removal of silica in the ceramic tube; the change of air pressure in the sensor and fiber optic cooling system; the measurement disturbance when the height plane of the molten steel pool changes; the fixation and calibration of the sensor in the stainless steel tube; the measurement response Adjustment of time; adjustment of calibration factor; measurement ratio (slope) of two sensors

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