转炉炼钢氧气压力的选择

 转炉的工作氧压由喷头马赫数决定，使氧射流对熔池的穿透深度[(L)]与熔池深度[(L0)]有一个合适的比例[(L/L0)]。据实际调查，国内有1/3转炉钢厂的工作氧压不合理。根据理论分析和生产实践经验，转炉的工作氧压应比氧气喷头马赫数所对应的滞止压力高5%～15%，可以减少射流在超音速范围内的激波损失，使氧射流对熔池有较大的冲击深度，也可防止因喷孔出口处的负压而使喷孔快速熔损。在氧气喷头设计和制定供氧制度中还需了解氧气管道压力损失[Δp]，用实测法所得到的[Δp]值较为可靠。

Oxygen Pressure Selection in BOF

Oxygen pressure of work in BOF is decided by nozzle Mach number. Oxygen jet penetration depth of the bath [(L)] and the bath depth [(L0)] has an appropriate ratio [(L/L0)]. About 1/3 steel plant’s working oxygen pressure is unreasonable in China. According to theoretical analysis and practical experience, working oxygen pressure is usually higher （5%～15%） than stagnant pressure according to Mach. Therefore, shockwave losses of flow jet can be reduced, penetration depth of jet is deeper and nozzle rapid melting caused by negative pressure at nozzle outlet can be prevented. Pressure losses [(Δp)] caused by oxygen passing through pipeline should be understand during nozzle designing. Field measurement method is comparatively reliable to get the pressure loss.