TY - JOUR
T1 - An Improved Model for the Heat-Up Stage of the CAS-OB Process
T2 - Development and Validation
AU - Kärnä, Aki
AU - Järvinen, Mika
AU - Sulasalmi, Petri
AU - Visuri, Ville Valtteri
AU - Ollila, Seppo
AU - Fabritius, Timo
PY - 2018/10/1
Y1 - 2018/10/1
N2 - 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.
AB - 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.
KW - CAS-OB
KW - CFD
KW - chemical heating
KW - mathematical modeling
KW - top lance
UR - http://www.scopus.com/inward/record.url?scp=85050546449&partnerID=8YFLogxK
U2 - 10.1002/srin.201800141
DO - 10.1002/srin.201800141
M3 - Article
AN - SCOPUS:85050546449
VL - 89
JO - Steel Research International
JF - Steel Research International
SN - 1611-3683
IS - 10
M1 - 1800141
ER -