METHOD FOR DETECTING ABNORMALITY IN BLAST FURNACE, AND METHOD FOR OPERATING BLAST FURNACE

摘要

Provided are a method for detecting an abnormality at a blast furnace with which the abnormality causing clogging of a tuyere can be detected at an early stage and a method for operating a blast furnace using the method for detecting the abnormality. A camera 11 is disposed near a tuyere 2 of a blast furnace 1 and an image of a raceway unit is captured through an in-furnace monitor window 6 disposed at the tuyere 2. Then, an abnormality causing clogging of the tuyere unit is determined to have occurred when the brightness of the captured image captured by the camera 11 is determined to be lower than or equal to a threshold S and the rate of change in brightness is determined to be lower than or equal to a threshold R (the rate of decrease in brightness is determined to be lower than or equal to a threshold).