METHOD FOR ESTIMATING FALLING POSITION OF RAW MATERIAL CHARGED INTO ROTARY CHUTE TYPE BLAST FURNACE

PURPOSE:To detect the falling position of a raw material with simple constitution and high accuracy by inserting and disposing a long-sized member into a raw material falling space in the cross direction of a blast furnace and respectively providing oscillation detecting sensors to both ends, on the outside of the furnace, of such long-sized member. CONSTITUTION:The long-sized member 8 is inserted and disposed into the blast furnace so as to penetrate the wall 1 thereof and cross the inside of the furnace. The oscillation detecting sensors 9, 10 are respectively provided to both ends, on the outside of the furnace, of the long-sized member 8. The raw material 4 is charged by a chute 3 into the furnace in the above-mentioned constitution and the acoustic oscillations generated upon collision of the raw material 4 against the point P of the long-sized member 8 are transmitted to the oscillation detecting sensors 9, 10. The difference DELTAT(Ta-Tb) between the time Ta and Tb until the acoustic oscillations are transmitted to the sensors 9, 10 is measured and the distance from the sensor (or 10) up to the collision point P is measured. Plural thermometers A1-A9 are installed in the longitudinal direction of the long-sized member 8 to measure the temps. in the respective parts so that the change of the velocity of sound in the long-sized member 8 at various parts, etc., is subjected to temp. compensation.