METHOD FOR PREDICTING SLOPPING OF CONVERTER FURNACE, METHOD FOR OPERATING CONVERTER FURNACE, AND SYSTEM FOR PREDICTING SLOPPING OF CONVERTER FURNACE

摘要

The present invention predicts occurrence of slopping during decarburization refining of molten iron in a converter furnace without requiring a slopping detecting sensor to be installed within the converter furnace or in the immediate vicinity thereof and without causing time delay. The present invention pertains to a method for predicting slopping during decarburization refining in a converter furnace for producing molten steel from molten iron through molten iron decarburization refining by spraying an oxidizing gas from a top-blowing lance onto the molten iron in the converter furnace or further spraying an oxidizing gas or inert gas from a bottom-blowing tuyere, the method involving: measuring an emission spectrum of throat combustion flame blown out from a throat of the converter furnace; calculating an emission intensity for a wavelength range of 580-620 nm in the measured emission spectrum; and predicting an occurrence of slopping on the basis of time series variations in the calculated emission intensity.