PR-503-016 - 2019 STEELSIM Conference Proceedings

Modeling of Continuous Scrap Pre-Heating

Schubert, Eickhoff, Pfeifer

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The secondary material production is most of the time preferable concerning energy and environmental issues. For example, steel production from recycling material saves about 1.5 million tons of CO2 per ton of steel 1. It is estimated that roughly 630 million tons of steel are made from recycled material every year, with increasing tendency1 The electric arc furnace (EAF) is the state of the art melting aggregate for the secondary steel production route2. The common design of an electric arc furnace is a flat bath for the liquid metal, three electrodes for alternating current and burners in sidewalls for additional heating (see Figure 1). Scrap and slag builder are typically charged by baskets from the top. The roof is closed and the electrodes are lowered to a certain level above the scrap. The high voltage between the electrodes forces electric arcs sparkling from one electrode tip to the scrap and back to another tip. The high temperatures of the arcs melt up the scrap and form a foamy slag surrounding the arcs. The process produces a lot of hot offgas and dust, excavated through the water cooled off-gas duct. The off-gas has temperatures between 900 C and 1200 C.

Keywords: EAF, scrap preheating, energy recovery, numerical simulation, CFD, ANSYS Fluent, porous media