University of Oulu

Pauna, H., Willms, T., Aula, M. et al. Electric Arc Length-Voltage and Conductivity Characteristics in a Pilot-Scale AC Electric Arc Furnace. Metall Mater Trans B 51, 1646–1655 (2020).

Electric arc length-voltage and conductivity characteristics in a pilot-scale AC electric arc furnace

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Author: Pauna, H.1; Willms, T.2; Aula, M.1;
Organizations: 1Process Metallurgy Research Group, University of Oulu, P.O. Box 4300, 90014, Oulu, Finland
2Department of Industrial Furnaces and Heat Engineering, RWTH Aachen University, Kopernikusstrasse 10, 52074 Aachen, Germany
3Nano and Molecular Systems Research Unit, P.O. Box 3000, 90014, University of Oulu, Oulu, Finland
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 1.1 MB)
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Language: English
Published: Springer Nature, 2020
Publish Date: 2020-10-23


The heat transfer processes and the molten metal bath kinetics of the electric arc furnace are governed by the changes in the arc length and voltage. Thus, information on the electric arc behavior with respect to the voltage is important for accurate computation of the furnace processes and adjustment of the industrial furnace parameters. In this work, the length-voltage characteristics of electric arcs have been studied in a pilot-scale AC electric arc furnace with image analysis, electrical data from the furnace, and slag composition. The arc length was determined with image analysis and the relation between the arc length and voltage from test data. The relation between arc length and voltage was found to be non-linear and dependent on the slag composition. The voltage gradients of the arcs were evaluated as a function of arc length and sum of anode and cathode voltage drops resulting in a reciprocal relation. Furthermore, the electrical conductivity of the arc plasma with respect to arc length was estimated.

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Series: Metallurgical and materials transactions. B, Process metallurgy and materials processing science
ISSN: 1073-5615
ISSN-E: 1543-1916
ISSN-L: 1073-5615
Volume: 51
Issue: 4
Pages: 1646 - 1655
DOI: 10.1007/s11663-020-01859-z
Type of Publication: A1 Journal article – refereed
Field of Science: 215 Chemical engineering
114 Physical sciences
Funding: Open access funding provided by University of Oulu including Oulu University Hospital. We wish to acknowledge the support of Research Fund for Coal and Steel under Grant Agreement No. 709923, Academy of Finland for Genome of Steel Grant No. 311934, and Steel and Metal Producers’ Fund for a 2019 postgraduate Grant.
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