An Improved Model for the Heat-Up Stage of the CAS-OB Process: Development and Validation

Aki Kärnä*, Mika Järvinen, Petri Sulasalmi, Ville Valtteri Visuri, Seppo Ollila, Timo Fabritius

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

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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.

Original languageEnglish
Article number1800141
JournalSteel Research International
Volume89
Issue number10
DOIs
Publication statusPublished - 1 Oct 2018
MoE publication typeA1 Journal article-refereed

Keywords

  • CAS-OB
  • CFD
  • chemical heating
  • mathematical modeling
  • top lance

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