An improved model for the heat‐up stage of the CAS‐OB process : development and validation

Kärnä, Aki; Järvinen, Mika; Sulasalmi, Petri; Visuri, Ville-Valtteri; Ollila, Seppo; Fabritius, Timo (2018-07-04)
 
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https://doi.org/10.1002/srin.201800141

Kärnä, Aki
Järvinen, Mika
Sulasalmi, Petri
Visuri, Ville-Valtteri
Ollila, Seppo
Fabritius, Timo
John Wiley & Sons
04.07.2018

Kärnä, A., Järvinen, M., Sulasalmi, P., Visuri, V.-V., Ollila, S. and Fabritius, T. (2018), An Improved Model for the Heat-Up Stage of the CAS-OB Process: Development and Validation. steel research int., 89: 1800141. https://doi.org/10.1002/srin.201800141

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© 2018 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. This is the peer reviewed version of the following article: Kärnä, A. , Järvinen, M. , Sulasalmi, P. , Visuri, V. , Ollila, S. and Fabritius, T. (2018), An Improved Model for the Heat‐Up Stage of the CAS‐OB Process: Development and Validation. steel research int., 89: 1800141, which has been published in final form at https://doi.org/10.1002/srin.201800141. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving.
https://rightsstatements.org/vocab/InC/1.0/
doi:https://doi.org/10.1002/srin.201800141
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https://urn.fi/URN:NBN:fi-fe2019112644293
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Abstract

Details of chemical heating in the CAS‐OB process are not known exactly, making a computational model valuable in process development and control. A phenomena‐based numerical model of the CAS‐OB heating stage is presented. Chemical equilibrium at reaction surfaces is assumed to be limited by mass transfer. Making use of a law of mass action based kinetic approach, reactions, and mass transfer rates are solved simultaneously. Computational fluid dynamics is used to derive heat and mass transfer coefficients, which are then used in our model, consisting of only a few computational nodes. The model includes steel melt, slag, and gas phases, bell, and ladle structures, and three reaction fronts. Radiation, conduction, and convection heat transfer are solved in the system. The model outputs temperatures and chemical composition of the system, and the results are validated with industrial data from two measurement campaigns.

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