数式モデルによる電気炉製鋼の計算機制御

抄録

For the computer control of steelmaking process in electric arc furnace, a simplified mathematical model suitable for online application has been developed on the following procedure.
(1) An equation for judging the meltdown of scrap accurately by monitoring the position of electrodes and the furnace wall temperature throughout the melting stage has been developed.
(2) Equations for estimating decarburization and temperature increase in consideration of the decarburizing characteristics in oxygen blowing period, and equations for estimating molten steel temperature change and composition change in the period of temperature adjustment and tapping on the basis of heat and material balances have been developed.
(3) Based on these equations in the refining stage, the authors have developed control models calculating the amount of blown oxygen, electric power and ferroalloys requisite for the operation.
At EAF shop in Osaka Steel Works, the models are in use for the computer control and contribute to the reduction of power consumption and so on.