Abstract: In order to improve the problems of low oxygen supply intensity and long smelting cycle of 210 t large converter in a domestic steel plant， the parameters of the currently used six-hole oxygen lance nozzle were optimized and the jet dynamics characteristics were defined by numerical simulation. The results showed that： When the lance position was less than 1.5 m， the change of axial velocity did not change significantly with the Angle. When the lance position was more than 1.5 m， the decrease of axial velocity increased with the increase of the nozzle Angle. The coalescence behavior of jet was obviously improved with the increase of dip Angle. The effective kinetic energy of the jet decreased rapidly with the flow of the jet， when the lance position was 1.5 m， it only accounted for about 20% of the initial kinetic energy， and then the kinetic energy attenuation slowed down， and the kinetic energy loss was only about 5% when it reached 2.7 m. The optimized design parameters of the six-hole oxygen lance of 210 t converter are as follows： inclination Angle 15.5°， Mach number 2.06， throat diameter 45.89 mm， outlet diameter 61.14 mm. The industrial test results show that the optimized oxygen lance can reduce the oxygen blowing time by 43 s and increase the dephosphorization rate by 11.4%.

Key words: 210 t Converter, Six-hole Oxygen Lance, Jet Flow, Numerical Simulation, Industrial Applications

摘要： 为改善国内某钢厂210 t大型转炉供氧强度低、冶炼周期长等问题，对目前所用六孔氧枪喷头参数进行优化设计，利用数值模拟明确射流动力学特征。结果表明：枪位在1.5 m之前，轴向速度变化随倾角变化不明显，当枪位超过1.5 m时，随着喷孔倾角增加，轴向速度减小幅度增大。射流聚并行为随着倾角增加得到明显改善。射流有效动能随射流行进快速下降，枪位1.5 m时只占比初始动能的20%左右，随后动能衰减趋缓，到2.7 m时动能损耗仅5%左右。优化后的210 t转炉六孔氧枪设计参数为：倾角15.5°，马赫数2.06，喉口直径45.89 mm，出口直径61.14 mm。工业试验的结果表明，优化后的氧枪比目前所用氧枪的吹氧时间减少了43 s，脱磷率提高了11.4%。

关键词: 210 t转炉, 六孔氧枪, 射流, 数值模拟, 工业应用