METHOD FOR TRACKING CHARGED MATERIAL IN BLAST FURNACE

PROBLEM TO BE SOLVED: To establish a tracking method of a charged material in a blast furnace which can further surely execute the estimation of remained iron quantity and remained slag quantity in the blast furnace at each iron tapping. SOLUTION: At the time of charging raw material into the blast furnace, the charged material level just after charging is measured at each completing one lot of charging and the whole vol. (actual vol. value) of the charged material existing in the furnace is obtd. from this value. Then, after obtaining a theoretical vol. value of the charged material existing in the furnace at this time point, 'actual col. value- theoretical vol. value' is calculated. In the case of being negative to this value, it is estimated that the charged material existing in the furnace is made to discharge out of the furnace in order in each charging lot from the most previous charged one by the quantity until the above value converts to the positive value. Further, at the time of obtaining the above theoretical vol., a vol. conversion factor in the solid-liquid mixing state and a vol. conversion factor in the solid state are arranged, and the vol. conversion is executed based on the vol. conversion factor in the solid-liquid mixing state from the most previous charged one in the charging lot existing in the furnace in order and accumulated. The vol. conversion is executed and accumulated based on the vol. conversion factor in the solid state at the following time since the accumulated value exceeds a prescribed value.