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|1. (WO2014203509) METHOD FOR DETECTING ABNORMALITY IN BLAST FURNACE, AND METHOD FOR OPERATING BLAST FURNACE|
|Applicants:||JFE STEEL CORPORATION
|Title:||METHOD FOR DETECTING ABNORMALITY IN BLAST FURNACE, AND METHOD FOR OPERATING BLAST FURNACE|
Provided are: a method for detecting an abnormality in a blast furnace, which can detect, at an earlier stage, such an abnormality that a tuyere gets into a clogged state; and a method for operating a blast furnace, in which the aforementioned method is employed. A camera (11) is placed in the vicinity of a tuyere (2) in a blast furnace (1) to take an image of a raceway through a furnace inside monitoring window (6) arranged at the tuyere (2). When it is determined that the luminance of the image taken by the camera (11) is equal to or lower than a threshold value (S) and the rate of change in the luminance is equal to or lower than a threshold value (R) (i.e., the rate of decrease in luminance is equal to or lower than the threshold value), it is judged that such an abnormality that a tuyere part is in a clogged state occurs.