Abstract
This paper proposes a new control system for dephosphorization of steel-making process using a LD converter. The control system is composed of two steps and it stabilizes low phosphorous content in the hot metal after treatment. The first step creates target concentration of iron oxide in slag for the present charge, which is optimal to achieve effective dephosphorization. The target is obtained as a time series through component analysis of results of previous charges. The second step decides the control inputs for the present charge, oxygen blowing rate and lance height, by calculating a weighted summation of previous control inputs. The weight is based on the difference between the target concentration and the concentration of previous charge. The proposed system was applied to an actual process, and the result shows the high performance of the control at the end of this paper.
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