OPERATING METHOD OF BLAST FURNACE

PURPOSE:To perform stable operation of blast furnace for a long period of time by determining the control values which indicate quantitatively the deposited state of charge in the furnace and controlling various charging conditions, etc. so as to maintain the deposited layer of the charge in the furnace within the range of said control values. CONSTITUTION:The distance from the inside wall 1 of a furnace up to the position 3 in the crest part of the charge deposited layer is designated as L, in the deposited layer of the charge in the radial direction of the charge in the furnace. The deposition angle of the slope 5 of the layer on the central part side of the furnace is designated as theta1 and the deposition angle of the slope 4 of the layer on the wall 1 side as theta2. The values L, theta1, theta2 are so controlled so as to maintain 0.5-1.5m for L for both ore and coke, and 23-35 deg. theta1 and within + or -10 deg. for 2 for coke and 20-30 deg. theta1 and within + or -10 deg. theta2 for ore. The deposited state in the furnace is thus maintained to provide a target distribution of gaseous flow.