Effects of Some Operational Parameters upon Degasification Rate, Mixing Time, Splashing and Skull Development in a Combined-blow Converter during Steelmaking Refining: A Physical Model Approach

摘要

Experiments with a physical model 1:10 scale of a 75 ton combined blow converter were carried out in order to assess the influence of operational parameters such as oxygen lance geometry, blowing rate, bath-lance distance and bottom nozzles configuration on decarburization rates, mixing characteristics and spitting rate. The influence of the bottom nozzle inclination upon mixing and decarburization is negligible but is significant on spitting rate. Lance geometry shows a remarkable effect upon droplet ejection rate. These are technical data required for proper design since a higher rate of metal droplets formation is desirable without excessive splashing and or skull formation. Proper combination of these parameters leads to a shorter refining period. Based upon this physical modeling study a new lance design has been proposed for this vessel.