JPS5770209A - Method of regulating circumferential distribution in blast furnace operation - Google Patents

Abstract

PURPOSE:To reduce circumferenital deviations of distrubution in a blast furnace and stabilize the descent of material by a method wherein the blast furnace is divided into four stages, the position of a fusion zone and the distribution of material flow are detected at each point along the circumferential direction, and the amount of a heavy oil blown in and the distribution of charges are regulated based on the detection results. CONSTITUTION:The blast furnace is divided into four stages, i.e., a preheating zone, an indirect reduction zone, a direct reduction and fusion zone, and a dribbling zone. The data of a circumferential sonde provided at an upper part of the shaft, the descent of material n the circumferntial direction, the amoount of air blown through each branch pipe, the amount of heavy oil, the blasting conditions, the compositions of ores and coke, tapping data, etc. are inputted and calculations of heat exchange and reaction are conducted for each point along the circumferential direction. Based on the calculations, the circumfereitial distribution of material flow and the distribution of the fusion zone are estimated, and the regulation of the amount of heavy oil blown in the circumferential direction or the distribution of the changes by a movable armor are regulated so that the lowermost fusion zone level can be maintained to be at least an predetermined value, thereby stabilizing the descent of material. Accordingly, the material flow on the side of the circumferential furnace wall can be detected accurately and the accuracy in estimating the fusion zone distribution is enhanced.