An Improved Model for the Heat-Up Stage of the CAS-OB Process

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Journal Title
Journal ISSN
Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2018-10-01
Major/Subject
Mcode
Degree programme
Language
en
Pages
Series
Steel Research International, Volume 89, issue 10
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.
Description
Keywords
CAS-OB, CFD, chemical heating, mathematical modeling, top lance
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Citation
Kärnä , A , Järvinen , M , Sulasalmi , P , Visuri , V V , Ollila , S & Fabritius , T 2018 , ' An Improved Model for the Heat-Up Stage of the CAS-OB Process : Development and Validation ' , Steel Research International , vol. 89 , no. 10 , 1800141 . https://doi.org/10.1002/srin.201800141