Pilot-scale AC electric arc furnace plasma characterization
|Author:||Pauna, Henri1; Willms, Thomas2; Aula, Matti1;|
1Process Metallurgy Research Group, P.O. Box 4300, FI-90014, University of Oulu, Finland
2Rheinish-Westphalian Technical University, Department of Industrial Furnaces and Heat Engineering, Kopernikusstrasse 10, 52074 Aachen, Germany
3Nano and Molecular Systems Research Unit, University of Oulu, P.O. Box 3000, FIN-90014 Oulu, Finland
|Online Access:||PDF Full Text (PDF, 1.2 MB)|
|Persistent link:|| http://urn.fi/urn:nbn:fi-fe2019100431214
|Publish Date:|| 2019-10-04
Fundamental knowledge of the electric arc properties is important for the development of process control of electric arc furnaces. In this work, a pilot-scale AC electric arc has been studied with optical emission spectroscopy together with filtered camera footage. The properties of the arcs were determined with plasma diagnostics and image analysis in order to obtain both the characteristic plasma parameters and the physical form of the arc. The plasma temperatures, ranging from 4500 to 9000 K, were derived individually for three elements. The electron densities of the plasma were between 10¹⁸ and 10²⁰ cm⁻³ and fulfilled the local thermal equilibrium criterion, but the plasma temperatures derived from atomic emission lines for different elements had high and unpredictable differences. The properties of the electric arcs have been studied with respect to the arc length derived from the image analysis. The slag composition, especially the relative FeO content of over 30%, was observed to have a notable effect on the brightness of the arc on slag and thus also on the radiative heat transfer.
Plasma research express
|Type of Publication:||
A1 Journal article – refereed
|Field of Science:||
114 Physical sciences
215 Chemical engineering
We wish to acknowledge the support of Research Fund for Coal and Steel under grant agreement No. 709923 and Academy of Finland for Genome of Steel grant No. 311934.
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