Design of Improved Control Algorithms for Ladle Furnaces With Analysis of Electric Arc Current Harmonic Composition

Abstract

The aim of this research is the design of improved control algorithms for ladle furnaces, considering arc length adaptation to different argon blow conditions and slag layer depth. The paper considers the issues of optimizing asymmetric arc burn-ing regimes, which ensure the maximum reduction in radiation and an increase in thermal efficiency in phases located near the liquid metal mirror during bottom blowing and emergency lance operation. The experimental results of liquid bath sur-face behavior in dependence from blowing intensity and slag layer depth are presented. On the basis of experimental re-sults, new algorithms of electric modes control in ladle furnaces are proposed. These algorithms allow dynamic adaptation of electric arc lengths to different argon blowing modes and slag layer depth to be provided. Applying of this algorithm al-lows the requisite conditions for improving of different quality indicators in ladle furnace to be ensured, since the correct adaptation of electric mode to varying conditions of melting has a direct con-nection with thermal efficiency of electric arcs and efficiency of equipment in general.