Top blown O₂ + CO₂ mixed injection technology with a swirling oxygen lance nozzle, which supports a larger jet radial velocity than the conventional oxygen lance nozzle, improves the impact area of the jet and thus the process efficiency of converter smelting. In this study, the jet characteristics of a 90% O₂ + 10% CO₂ mixture injected through a full-scale four-hole swirl nozzle was simulated and the effects of preheating temperature and gas flow rate on the jet characteristics were analyzed. Increasing the preheating temperature and gas flow rate increases the axial velocity of the jet, the core section, and the mixing degree of multiple jets. At the same injection distance, increasing the preheating temperature of the mixture increases the impact strength and area of the jet. These results can be used to adjust the gas flow rate and preheating temperature of the mixed gases in large-scale smelting operations.

采用旋流氧枪喷嘴的顶吹O ₂  + CO ₂混合喷射技术，支持比传统氧枪喷嘴更大的射流径向速度，提高射流的冲击面积，从而提高转炉冶炼的工艺效率。在本研究中，90% O ₂  + 10% CO ₂的射流特性模拟了通过全尺寸四孔涡流喷嘴喷射的混合气，并分析了预热温度和气体流量对射流特性的影响。提高预热温度和气体流量会增加射流的轴向速度、核心截面和多股射流的混合程度。在相同的喷射距离下，提高混合物的预热温度会增加射流的冲击强度和面积。这些结果可用于调整大规模冶炼操作中混合气体的气体流量和预热温度。