ESTIMATION METHOD OF BURNING RATE OF REDUCTION MATERIAL INJECTED IN BLAST FURNACE, OPERATION METHOD OF BLAST FURNACE AND BLOWING TUYERE

摘要

To realize a stable operation of a blast furnace by accurately estimating and utilizing the burning rate of an injected reduction material in the blast furnace operation in which the reducing material is blown into the furnace.SOLUTION: In the blast furnace operation, a reduction material is blown into the furnace through a blowing pipe in which a tip portion is located in a blowing flow path of the blower tuyere body or a blowing pipe path of a blowpipe upstream side of the blower tuyere. Emission peak intensity of a radical of the reduction material is measured in the burning field through an observation hole provided in the blower tuyere body or the blowpipe. The obtained emission peak intensity is compared with a calibration curve representing the relationship between the burning rate of the reduction material and the emission peak intensity of the radical in the burning field. The burning rate of the reduction material is thus estimated from the measured emission peak intensity of the radical in the burning field.SELECTED DRAWING: Figure 4