ISSN 2594-5327
56º Congresso anual — Vol. 56 , num. 1 (2001)
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Depending on the application, steel grades contents in carbon, nitrogen and hydrogen have to be controlled either in a certain range, or at ultra low values. Particularly for automotive and packaging applications, the aimed ultra low carbon levels (below 10 ppm) on liquid steel require an optimization of the decarburization kinetics during vacuum treatment. Physical models were developed to describe the kinetics of the different mechanisms of element transfer: by gas purging at interface between injected gas bubbles and liquid metal, by spontaneous boiling due to vacuum, at metal drops surface splashed in vacuum atmosphere… Specific dynamic models of vacuum treatment have been constructed by identification of the involved reaction sites through an hydrodynamic description of the reactor. Special trials in industrial plants, using gas analysis and extracted gas flow rate measurements, were made in order to obtain precise and reliable kinetic data. The validated models identify the dominant mechanisms depending on the progress of the treatment and are used to: evaluate the effect of operating parameters (initial contents, injected gas flow rates, geometry of reactor, pump capacity…), propose process optimization guidelines, define required new equipment characteristics or new operating conditions.
Depending on the application, steel grades contents in carbon, nitrogen and hydrogen have to be controlled either in a certain range, or at ultra low values. Particularly for automotive and packaging applications, the aimed ultra low carbon levels (below 10 ppm) on liquid steel require an optimization of the decarburization kinetics during vacuum treatment. Physical models were developed to describe the kinetics of the different mechanisms of element transfer: by gas purging at interface between injected gas bubbles and liquid metal, by spontaneous boiling due to vacuum, at metal drops surface splashed in vacuum atmosphere… Specific dynamic models of vacuum treatment have been constructed by identification of the involved reaction sites through an hydrodynamic description of the reactor. Special trials in industrial plants, using gas analysis and extracted gas flow rate measurements, were made in order to obtain precise and reliable kinetic data. The validated models identify the dominant mechanisms depending on the progress of the treatment and are used to: evaluate the effect of operating parameters (initial contents, injected gas flow rates, geometry of reactor, pump capacity…), propose process optimization guidelines, define required new equipment characteristics or new operating conditions.
Palavras-chave
Vacuum degassing, RH, Tank degasser, Dynamic model
Vacuum degassing, RH, Tank degasser, Dynamic model
Como citar
SaintRaymond, H.; Huin, D.; Stouvenot, F.; Schutz, R.; Pluquet, R.; Perrin, E..
PROCESS OPTIMIZATION OF STEEL VACUUM DEGASSING IN RH AND TANK DEGASSER: GAS ANALYSIS MEASUREMENTS AND PHYSICAL DYNAMIC MODEL.,
p. 1208-1217.
In: 56º Congresso anual,
Belo Horizonte, Brasil,
2001.
ISSN: 2594-5327, DOI 10.5151/2594-5327-C01199
