Abnormality determination apparatus for a blast furnace, an abnormality determination method for a blast furnace, a method for operating a blast furnace, and a manufacturing method for molten iron

摘要

(Project) To provide an abnormality determination apparatus and method capable of detecting not only abnormal state detection, but also detection of a preliminary indication of state abnormality in a blast furnace. (Solution means) The abnormality determination device 10 detects an abnormality in the blast furnace 1 using a plurality of sensors S1 to Sn provided at different positions of the blast furnace 1 , and the plurality of sensors S1 to Sn ) based on the evaluation value calculation unit 11 that calculates an evaluation value from the plurality of measurement data D1 to Dn detected by , and the evaluation value EV calculated by the evaluation value calculation unit 11, It has an abnormality detection unit 12 that detects abnormality in the blast furnace 1 using a threshold EVref1 and a preconditioning threshold EVref2 smaller than the abnormality threshold EVref1. The abnormality detection unit 12 determines that the evaluation value EV is abnormal when the evaluation value EV is larger than the abnormality threshold value EVref1, and the period in which the evaluation value EV is larger than the preliminary preparation threshold EVref2 is the set period PT ) If the abnormality continues, it is judged that there is an abnormal precedent.