SUSTAINABLE ELECTRIC STEEL PRODUCTION: GreenEAF

AUTHOR/S: LORIS BIANCO, GIULIA BARACCHINI FILIPPO CIRILLI, LOREDANA DI SANTE ANDREA MORICONI, ERICA MORICONI MILLAN MARCOS AGORIO THOMAS ECHETERHOFF, H. PFEIFER , THURSTEN DOMUS HANS PETER JUNG, C. BEILER HANS-JÖRG KRASSNIG

ABSTRACT

In the modern electric arc furnace (EAF) more than 40% of energy comes from chemical sources by fossil fuels: natural gas is used in dedicated burner during the melting of the scrap while coal (mainly anthracite), lump in the basket and pulverided by wall injector, is used as foaming agent. In the frame of the European Research Fund for Coal and Steel (RFCS), the ongoing project GREENEAF (RFSR-CT-2009-004), is studying the possibility to replace coal and natural gas in EAF with char and syngas produced by biomass pyrolysis.The best process condition to obtain by pyrolysis process the proper sysng and char quality has been defined by laboratory test for differ type of biomass available in the surrounding of the partners steel shops. Industrial trials have been performed in three different EAF plant using different charging/injection procedure.The results obtained have demonstrated the technical feasibility of the used approaches while the economical evaluation have showed the sustainability of replacing the coal with char from biomass, in addition to environmental benefits due to CO2 reduction. The use of syngas by biomass pyrolysis in the wall mounted burner has been investigated by calculation based on CFD analysis.

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