ArcelorMittal Hamburg GmbH, Hamburg:

M. Hölling, Dr.Eng., Head of Direction “Technology of Process”, marc.hoelling@arcelormittal.com

U. Braun, Dr.Eng., Head of Department “Steelmaking”

A. Jüchter, Eng., Head of Steelmaking

J. Pröiβ, Eng., Assistant of Head of Sleelmaking

Energy efficiency is a long time essential of the strategy of ArcelorMittal Hamburg. Major savings in carbon dioxide emissions of 47 000 t/a could be achieved in the steel plant which consists of a Midrex plant and an electric arcfurnace. Production process line includes Midrex direct reduction unitm electric arc furnace, ladle furnace, 7-strand continuous caster and 2-string wire rod mill with total productivity 900,000 tpa. For identifying energy efficiency projects, processes are analyzed with a systematic approach that is based onthree categories of efficiency projects and special flow chart is built. Energy flows for the process gas blowers in the Midrex plant are analyzed in details, as well as development of overall efficiency for process gas compressors. This approach will be presented in detail by implemented projects as well astheir individual savings in carbon dioxide. Development of specific energy savings at the EAF after installation of the new transformer is considered. Comparison of CO₂ emissions of the steel plant ofArcelorMittal Hamburgwith a blast furnace plant is made. Dry dedusting system with PTFE filters in the Midrex plant is displayed. Implemented energy efficiency projects since 2007 are overviewed.

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2. Dahlmann, P.; Endemann, G.; Kerkhoff, H. J.; Lüngen, H. B.: Wege zur Effizienzsteigerung in der Stahlindustrie, Stahlinstitut VDEh, Wirtschaftsvereinigung Stahl, Düsseldorf, 2010.

3. Herwig, H.; Kautz, C. H.: Technische Thermo dynamik, Pearson, 2007.

4. ArcelorMittal Hamburg Energy Management Handbook, Hamburg, 2010