METHOD OF OPERATING BLAST FURNACE

PURPOSE:To execute the operation of the blast furnace more efficiently than heretofore by recognizing a slip and blow by a change in the descending amt. of the charge level in the furnace and the temp. of a furnace top gas and taking an adequate action. CONSTITUTION:The furnace body of the blast furnace is circumferentially segmented to plural pieces and the level difference ( l) at the time of embedment between at least the two consecutive batch charges is detected for each of the blocks. Decision is made that the slip arises when the level difference ( l) exceeds the prescribed value (about >=0.3m) which is previously determined. The size of the slip is evaluated by the size of the level difference ( l). The blow by is decided if the temp. of the furnace top gas rises sharply or the N2 concn. in the furnace top gas changes drastically, even if the level difference ( l) is below the prescribed value. The slip and blow by in the blast furnace are detected in this way and the efficient operation is executed by the adequate action.