Development of the Endpoint Control System for VOD Refining Process

Abstract

For the endpoint control of VOD refining, a new simplified mathematical model suitable for online application has been developed on the following procedures.
(1) The equation of oxygen consumption in the period of vacuum oxygen decarburization is formulated, which comprises the range from low carbon to high carbon.
(2) The carbon content in the melt in the period of vacuum decarburization and temperature rise are formulated.
(3) By means of above-mentioned equations, the control system for carbon content and temperature at the endpoint of decarburization has been developed.
At VOD shop in Amagasaki, the system is being used for the endpoint control, and is contributing to the decrease of the amount of reduction agent, flux and blown oxygen by prevention of excessive decarburization.