Abstract: The gas jets of variable and non-variable angle four-hole oxygen lances for 50 t BOF have been numerically simulated by using Fluent software to study the effect of inclining angle of jet nozzles on oxygen jet flow field and syncretizing length of jet-flows. Results show that in distance near the outlet of jet-nozzle the each jet-flow is independent free-flow, with increasing distance from outlet of jet nozzle the each jet-flow continuously spreads out and merges each other into one jet-flow (stream) at certain distance; the syncretizing distance of jet-flows of non-variable angle jet nozzle A is 1. 3 m that is consistent with the cold water simulated test results in which at situation of lance level 1.3 m the spitting amount from furnace is maximum; the inclining angles of opposite angles jet hole of variable angle oxygen lances vary from lance B to lance I, and the jet-flows of these lances syncretize for two times led to abruptly reduce the furnace spitting amount ； compared with difference 1° of inclining angles, the variable angle oxygen lances with difference 0. 5° of inclining angles of opposite angles jet hole is more favorable to increase the syncretizing distance ； among the studied nine jet nozzle with inclining angles 10. 5° ~ 11.5°/12. 5°, the jet nozzle H with inclining angle 5° has maximum jet flow syncretizing distance, its theoretical furnace mouth spitting amount is lowest.

摘要： 采用Fluent软件模拟了50 t转炉四孔变角和非变角氧枪气体射流,研究了喷孔倾角对氧气射流流场和流股融合距离的影响。结果表明,在距喷头出口距离较近时,各流股独立为自由射流,随着距喷头出口距离的增加,各流股不断扩张,并在一定距离时融合成单股射流;非变角喷头A的流股融合距离为1.3 m,与冷态水模实验得出枪位1.3 m时炉口溅出量最大是一致的;变角氧枪B至I的对角喷孔倾角不同,射流流股融合了两次,大大降低了炉口溅出量;变角氧枪对角喷孔倾角相差0.5°较对角喷孔倾角相差1°时更有利于射流融合距离的增加;在研究喷孔倾角10.5°~11.5°/12.5°的9个喷头中,倾角11°/11.5°的喷头H射流融合距离最长,其理论炉口喷溅量最少。