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AssigneeKawasaki Steel Corporation
InventorsKanji Emoto, Masayuki Onishi, Hirosuke Yamada, Katsuhisa Hirayama, Hideshi Ohzu, Masakatsu Ogawa, Yasuo Masuda
Estimating the term…
Methods for controlling blowing, controlling the slag formation and predicting sloping in the blowing of molten pig iron in LD converter are carried out by measuring acceleration of the horizontal movement of a detector, such as a lance provided in the converter, which is caused only by the slag impinging against the lance, by an accelerator, integrating the measured values to obtain integrated average values at every several seconds, and programming the integrated average values in a computer.
A method for controlling a slag formation in an LD converter, which comprises steps of providing a member vertically hung in the converter to be subjected to slag movements caused by foamed slag, providing an acceleration detector secured to the member for measuring acceleration of horizontal movement acting on the member, integrating the values of said measured acceleration to obtain the average values of said integrated acceleration over every several seconds, and changing at least one of the member's height and oxygen flow rate in the converter using the integrated average values of acceleration so as to control the slag formation in the converter.
A method for predicting sloping in an LD converter, which comprises successively measuring acceleration in the horizontal direction of movement of a lance inserted into the converter during blowing, integrating the values of said measured acceleration to obtain the average values of said integrated acceleration over every several seconds, collating three successive integrated average values thus obtained for time variation of said acceleration with corresponding one of a plurality of patterns previously classified by possible combinations of three successive integrated average values of acceleration, discriminating said collated corresponding pattern and formulating said discriminated pattern, whereby the slag forming condition is estimated from several seconds to dozens of seconds of measured time.
Dependencies are inferred from the claim text.