Single Bucket Charging Practice with Telescopic EAF Roof Closure

by Özgur Nal, Serkan Dolapçioğlu , Adam Partyka, Stefano Miani, Riccardo Gottardi, Hans-Joerg Krassnig

Publisher - Yolbulan Baştug Metallurgy Industry Co., Osmaniye, Turkey and INTECO Melting & Casting Technologies GmbH, Bruck an der Mur, Austria

Category - Engineering & IT

Single bucket charging – except for a pure savings with only one roof opening per heat and limited energy losses – allows for more efficient in-shell scrap preheating through the heat generated by the burners and oxygen injection and higher degree of CO post-combustion thanks to enlarged shell volume. A furnace with telescopic roof closure has been invented by Fuchs Technology and installed at YOLBULAN BAŞTUG melt shop in Turkey with the main target to allow for single bucket charge even with low charge density. The unique feature of this furnace is a possibility of gradual shell volume decrease in function of the melting process progress reducing energy losses to water-cooled panels. Thanks to decrease of the electrode hot length also a substantial savings in the electrode consumption can be seen. After 5 years of successful operation, Yolbulan searched for further increase of the EAF productivity in the present market conditions with continuous decrease of scrap quality. In August 2015, the EAF has been equipped with a new larger shell and bigger transformer. INTECO, being a new owner of Fuchs Technology was been invited to optimize the melting process parameters of the furnace working in new conditions. The paper reveals the experience of the optimization work done on site in common with the presentation of the achieved results compared with the furnace operation in the original configuration.

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