It is important to know the behavior of jets from a top-blown lance in order to control the spitting phenomena in the converter. However, there are few studies on the characteristics of jets from nozzles and effects of them on spitting rates.
In this study, the characteristics of jets from multi-hole lance and the effects of them on spitting behavior were investigated by cold and hot model experiments. Furthermore, lances were proposed and evaluated which have newly designed 6-hole nozzles with different diameters and inclination angles.
As a result, spitting rates were found to be influenced by maximum dynamic pressure of jets and distance of pressure peak from the lance axis. And lances with newly designed nozzle arrangement were confirmed to be effective to decrease the spitting rate.