Molten Steel Level Measurement in Tundish with Heat Transfer Analysis

概要

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Temperature variation rate is different between “molten steel – tundish cover flux(TCF) – air” layers in tundish because heat transfer between these three materials with different thermal conductivities. Numerical calculation proves that temperature gradient extremums exist at the interfaces of “molten steel – TCF – air” layers in tundish. At the same time the change of initial temperature, thermal conductivity, convection coefficient have no effect on the interfaces locating. Thus temperature gradient extremums can be used for measuring molten steel level in tundish. In the process of measurement, a CCD camera is used to capture the thermal image of measuring sensor which is inserted into tundish to get the temperature distribution. By calculating temperature gradients of the measuring sensor in the thermal images, the interfaces of “molten steel – TCF – air” can be located, finally the molten steel level is obtained. The influence of measuring sensor adhering by TCF is also solved by gray image projection algorithm. Steel metallurgical field experiment shows that the method of molten steel level measurement is authentic and measuring error is less than 5 mm.