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Steel making
ArticleName Development and research of improved automatic control systems for electrotechnological modes of high-power ladle-furnace units
DOI 10.17580/chm.2023.12.06
ArticleAuthor A. A. Nikolaev, P. G. Tulupov, R. R. Dema, S. S. Ryzhevol

Nosov Magnitogorsk State Technical University, Magnitogorsk, Russia:

A. A. Nikolaev, Cand. Eng., Associate Prof., Head of the Dept. of Automated Electric Drive and Mechatronics, e-mail:
P. G. Tulupov, Cand. Eng., Associate Prof., Dept. of Automated Electric Drive and Mechatronics, e-mail:
R. R. Dema, Dr. Eng., Prof., Dept. of Machines and Technologies of Metal Forming and Mechanical Engineering, e-mail:
S. S. Ryzhevol, Postgraduate Student, Dept. of Automated Electric Drive and Mechatronics, e-mail:


A new method for selecting optimal asymmetrical arcing modes in ladle furnace (LF) units under various argon blowing modes, used when setting up advanced automatic control systems for the electrotechnological modes of LF, is described. The main configuration options for one- and two-position LF based on the location of purge plugs and emergency lances are considered. For each option, criteria for the optimal electrical modes of the LF have been formed, which allow a consistent search for the optimal values of the impedance settings of the secondary electrical circuit. A new algorithm and automatic control system for the LF with the ability to adapt to various slag modes and argon blowing modes are considered. This algorithm differs from the known ones in that it provides the possibility of dynamically adapting the lengths of electric arcs in phases subject to the strongest influence of the liquid metal bath level, by moving to an operating curve with a predetermined set of optimal impedance settings. For the new method for selecting optimal asymmetrical modes and control algorithm, the main results of their practical implementation at leading metallurgical enterprises are presented.
The work was carried out with financial support from the Ministry of Science and Higher Education of the Russian Federation (project No. FZRU-2023-0008).

keywords Ladle-furnace unit, electrical mode control system, electric arc, asymmetrical arcing modes, bottom argon purging, emergency lance, optimization of electrical modes

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