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Building a 200 kW Rotating Billet Superconducting Induction Heater

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Building a 200 kW Rotating Billet Superconducting Induction Heater

Niklas Magnusson and Magne Runde, SINTEF Energy Research, Trondheim, Norway
Stefan Dappen, SMS Elotherm, Remscheid, Germany
Artur Dobosz, Grupa Kety SA, Kety, Poland
Peter Blau and Gerhard Kalkowski, Fraunhofer Gesellschaft. Germany
Giovanni Grasso, Columbus Superconductors, Genova, Italy
Risto Mikkonen, Tampere University of Technology, Tampere, Finland
Zdenek Jelinek, Skoda Vyzkum, Czech Republic
Bernard Nacke, University of Hannover, Hannover, Germany
Tomasz Stuczynski, Institute of Non-Ferrous Metals, Skawina, Poland

Track: EXTRUSION EQUIPMENT - Billet/Log Heating/Handling

ABSTRACT --- A 200-kilowatt (kW) induction heater based on a new concept
is under development. In the system the aluminium billet is rotated in a directcurrent
(DC) magnetic field. The magnetic field is generated lossless in induction
coils made of low-cost MgB2 superconductor wires. The goal is to reduce the
overall lifetime costs compared to conventional heaters, while maintaining the
quality of the heating. The main savings are in the energy costs. Compared to
conventional state-of-the-art induction heaters with an energy efficiency of 50 to
60 percent, this first rotating billet heater is designed to reduce energy losses by a
factor of 2-to-3. With further optimization, the potential for loss reduction is a
factor of 5-to-6 compared to conventional induction heaters for the same purpose.
For the investment costs, the new technique adds a system for the rotation of the
billet and a system for cooling the superconducting coils. On the other hand,
there is no need for the high-power electronics present in conventional heaters.
The development of the new induction heater is a joint European project between
four companies, three research institutes, and two universities.

© Extrusion Technology for Aluminum Profiles Foundation (ET Foundation). All rights reserved. No part of The Proceedings may be reproduced in any form without the express written permission of the ET Foundation.