METHOD FOR MANY SECTION INJECTION WHEN RETURNING STOCK LEVEL EXCHANGING CENTER COKE

摘要

PURPOSE: A method is provided which prevents dropping of a central temperature, thereby minimizes a temperature variation at the top of the furnace by constantly maintaining a central flow of coke, and stabilizes conditions of a blast furnace with the stable gas flow inside the furnace by securing air-permeability in the cohesive zone. CONSTITUTION: The multi-section charging method for replacing center coke when returning to a charging material level comprises the processes of judging whether or not to use a charging mode for replacing the center coke and to which position the charging material level is applied when dropping of a charging material level is sensed from an alarm and a recorder of a work site; selecting a return point of a charging matrix when the charging mode for replacing the center coke and the charging material level are set so that coke, large sized iron ore and small sized iron ore are continuously charged, and separately selecting a return point of the coke charging matrix so that each two coke screens are operated; setting a coke weighing mode to three notches one rotation respectively as a substitute for the center coke, adding up the calculated number of rotations to the total number of rotations by automatically calculating the number of rotations in the coke matrix, and changing a tilting angle of a rotation chute using the three notch set values; calculating charging so that the charging amount of the center coke is equally divided and weighed at both sides of a coke weighing hopper, and closing a control valve for controlling ore flow rate and tilting the rotation chute to the notch in which the next number of rotations are set when the number of rotations are completed at the final notch of the continuous rotation of coke; and rotating the rotation chute by opening the control valve for controlling ore flow rate as much as the set value, completing charging by fully opening the control valve for controlling ore flow rate when the number of rotations is equal to the total number of rotations, and automatically compensating the control valve for controlling ore flow rate by comparing the transmitted center coke amount with the set value.