50t转炉四孔变角氧枪射流融合距离的数值模拟

Numerical Simulation on Syncretizing Distance of Gas Jet from Variable Angle Four-Hole Oxygen Lance for a 50 t Converter

采用Fluent软件模拟了50t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1．3m，与冷态水模实验得出枪位1．3m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。

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 syncreti- zing 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 syneretize 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 o 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 11°/11.5° has maximum jet flow syncretizing distance, its theoretical furnace mouth spitting amount is lowest.