ESTIMATING METHOD OF AMOUNT OF MOLTEN STEEL REMAINING IN LADLE

摘要

PURPOSE:To estimate the amt. of the molten steel remaining in a ladle in real time with high accuracy with the change point of the induced magnetic field point according to the outflow of the molten steel as a reference position by disposing an excitation coil and magnetic field intensity detecting coil on the wall surface of the ladle so as to face each other and detecting the above-mentioned change point. CONSTITUTION:The induced magnetic field intensity of the excitation coil 14 in the outflow process of the molten steel 5 in the ladle 1 is measured by the detecting coil 15. At least the two change points among the change points of the magnetic field intensity i.e., the points A, B, C of the time when the molten steel surface 11 arrives at the top and bottom ends of the coils 14, 15 and the zero amt. of the molten steel remaining in the ladle 1 are detected and are stored in a calculator 20. The outflow rate of the molten steel 5 between the two points B and C is measured or determined by calculation (the amt. of the steel remaining at the change point C is zero) and the amt. of the molten steel at the point B is stored in the calculator 20 for the purpose of the succeeding measurement. The amt. of the above-mentioned steel 5 at the point B is preferably corrected by the estimated rate of erosion of furnace wall refractories 3 and is used as the estimated reference value at the point B in the next measurement.