Towards dynamic modeling of the EAF process
Visuri, Ville-Valtteri; Aula, Matti; Ringel, Aron; Fabritius, Timo
Institute of Materials, Minerals and Mining
Visuri, V-V., Aula, M., Ringel, A. & Fabritius, T. (2021). Towards dynamic modeling of the EAF process. In EEC 2021. Proceedings of the 12th European Electric Steelmaking Conference.13-14 September 2021. Hybrid: Sheffield, UK & Online (pp. 351-359). Institute of Materials, Minerals and Mining.
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© The Authors
https://rightsstatements.org/vocab/InC/1.0/
© The Authors
https://rightsstatements.org/vocab/InC/1.0/
Julkaisun pysyvä osoite on
https://urn.fi/URN:NBN:fi:oulu-202506114328
https://urn.fi/URN:NBN:fi:oulu-202506114328
Tiivistelmä
Abstract
The electric arc furnace (EAF) is the main unit process in scrap-based steelmaking. This work aimed at developing a fundamental mathematical model of the EAF process for online use. The model is based on stand-alone modules for 1) scrap melting, 2) gas-phase reactions in the freeboard, and 3) metal–slag reactions. The description of scrap melting is based on energy and mass balances and accounts for the main heat transfer mechanisms relevant for the electrodes and gas burners. The gas-phase reactions are calculated using a Lagrangian method for minimization of Gibbs energy in the freeboard. The reactions between metal and slag are assumed to be controlled by mass transfer and the competitive equilibrium at the interface is solved using the effective equilibrium constant method. The preliminary results indicate that the scrap melting module provides a realistic depiction of the main phenomena. The equilibrium compositions predicted by the gas-phase reaction module were found to be in excellent agreement with earlier studies and commercial software. Functional validation of the metal–slag module was conducted based on literature data. In further work, the modules will be coupled for the simulation of complete heats from charging to tapping.
The electric arc furnace (EAF) is the main unit process in scrap-based steelmaking. This work aimed at developing a fundamental mathematical model of the EAF process for online use. The model is based on stand-alone modules for 1) scrap melting, 2) gas-phase reactions in the freeboard, and 3) metal–slag reactions. The description of scrap melting is based on energy and mass balances and accounts for the main heat transfer mechanisms relevant for the electrodes and gas burners. The gas-phase reactions are calculated using a Lagrangian method for minimization of Gibbs energy in the freeboard. The reactions between metal and slag are assumed to be controlled by mass transfer and the competitive equilibrium at the interface is solved using the effective equilibrium constant method. The preliminary results indicate that the scrap melting module provides a realistic depiction of the main phenomena. The equilibrium compositions predicted by the gas-phase reaction module were found to be in excellent agreement with earlier studies and commercial software. Functional validation of the metal–slag module was conducted based on literature data. In further work, the modules will be coupled for the simulation of complete heats from charging to tapping.
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