| 摘要 |
PROBLEM TO BE SOLVED: To effectively restrain the erosion of side wall brick by taking measures while combinedly carrying out a tracer tracking method and a Ti source blowing method in the optimum condition, at the time of partially raising the temp. of the furnace bottom side brick. SOLUTION: Iron tapping holes A, B being apart >=90 deg. from center angle in a blast furnace, interposing the position D where the furnace wall temp. raises, and a tuyere C positioned near the center between the tapping holes A and B are selected, and simultaneous, iron tapping from the tapping holes A and B and the blowing of the fixed quantity of the tracer fro the tuyere C are executed. Times from the tracer blowing to the start of discharges of the tracer from the iron tapping holes A, B, are measured and the deviation of molten iron flowing speed in the peripheral direction at the lower part of the blast furnace is estimated from this time difference. In the estimated position where the molten iron flowing speed is increased, at the time the condition of the following formula I is achieved, the Ti blowing is executed from the neighbor tuyere and this blowing quantity M' (kg/pig T) is decided with formula II.|TR-TL|/1/2(TR+TL)>=0.1... I. M'=[1+K|TR-TL|/(TR+TL)]×M... II, wherein, TR, TL are each the time starting the discharging of the tracer from the iron tapping holes A, B, M is Ti quantity blown in the conventional method and K is a fixed value.
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