Abstract：The flow state and reaction rate of the molten pool is the key to realize efficient smelting in the converter steelmaking process, which is mainly determined by the interaction of the oxygen jet with the bath and bottom blowing stirring intensity. A three-dimensional full-scale geometric model of the nozzle twisted lance in a 120 t converter was established. The jet characteristics of nozzle twisted lance with different swirl angles were studied by numerical simulation, and the stirring effect of impacting molten bath was compared and analyzed. The results show that with the increase of swirl angle, the length of the jet core is decreased, the distance between the jet center and the axis of oxygen lance is increased, the distance between the intersection point of the jet and the outlet of the orifice is improved, and the jet aggregation phenomenon is inhibited. When the swirl angle increases from 0° to 15°, the impact depth of the oxygen jet is decreased by 40%, and the impact radius is improved by 13%. The high-speed area on the longitudinal section of the molten bath is distributed near the impact dent, while the high-speed area on the cross-section is distributed in the external area of the extension line at the impact dent and the connection of adjacent dents.
吕明, 李航, 谢堃. 120 t转炉旋流氧枪的射流搅拌特性[J]. 钢铁, 2021, 56(4): 31-38.
LÜ Ming, LI Hang, XIE Kun. Jet stirring characteristics of nozzle twisted lance in 120 t converter[J]. Iron and Steel, 2021, 56(4): 31-38.
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2021, Vol. 56 
