Abstract
For the endpoint control of the top and bottom blowing process in BOF, a simplified mathematical model which is suitable for the online application has been established by the following procedure.(1)The basic equations for the rates of oxygen consumption and temperature increase, which have the comprehensive characteristics in both the ranges of low and carbon high carbon contents, have been derived in the current work.(2) On the basis of the basic equations, the fundamental curves of oxygen consumption and temperature increase, which show the progress of blowing, have been determined by the analysis of the actual operational data. The fundamental curve of dephosphorization has also been determined in the same way.(3) A control model for the endpoint carbon content and the endpoint temperature of metal has been established by the use of the fundamental curves.At No. 2 BOF shop in Kashima Steel Works, Sumitomo Metal Industries, Ltd., the model is now being used for the automatic blowing and contributes to the reduction of reblow ratio and furnace refractories.
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