Method for predicting slopping in converter, method for operating converter, and system for predicting slopping in converter

A system for predicting slopping in a converter occurring during decarburization refining in the converter in which molten steel is produced from molten pig iron by blowing oxidizing gas to the molten pig iron in the converter from a top blowing lance, and optionally further blowing oxidizing gas or inert gas from a bottom blowing tuyere to perform the decarburization refining of the molten pig iron, the system comprising:

• a spectroscopic camera disposed around the converter and configured to capture an image of a throat combustion flame through a gap between the converter and a movable hood;
• and
• an image analyzer configured to record, in a retrievable manner, image data sent from the spectroscopic camera, calculate emission intensity of an emission spectrum of the image data at a wavelength in a range of 580 to 620 nm, and predict occurrence of the slopping based on a time-series change of the emission intensity calculated.