| 摘要 |
PROBLEM TO BE SOLVED: To provide a method of determining, reliably with better accuracy, necessity of modification of operation conditions by evaluating the state of the inside of the furnace, early by simple means, during converter blowing.SOLUTION: A method of determining the necessity of modification of operation conditions during converter blowing comprises counting the number Cf of occurrence times of the state in which the instantaneous value of the exhaust gas flow rate time change rate 'a', calculated by equation (1) every specified time in a specified period after desiliconization, deviates out of an acceptable range Bf and comparing the Cf with a threshold value Ccrit to determine the necessity of modification of operation conditions during the blowing operation. Bf and Ccrit are determined preliminarily from cases which are determined not to require modification of operation conditions during a blowing operation, according to the correlation between 'a' calculated by the equation (1) in a specified period after desiliconization and blowing indices during the blowing operation, on the basis of operation data of a plurality of the same-type blowing operations conducted in past. Equation (1): 'a'={Q(t+&Dgr;t)-Q(t)}/&Dgr;t, where Q is a flow rate of exhaust gas; t is a time; and &Dgr;t is a time interval. |
