双侧吹气-渣-锍多相流流型演化特性的数值模拟

Numerical Simulation on Flow Pattern Evolution Characteristics of Two-side Blowing Gas-Slag-Matte Multiphase Flow

利用VOF耦合Realizable k-ε湍流模型对双侧吹多相流流型演化进行了数值模拟研究。分析了双侧吹多相流的流型演化过程,气-渣-锍三相间混合最终达到“动态平衡”。确定了平均湍动能和平均气含率方差在表征熔体混合均匀度上具有一致性,同时以平均湍动能和气含率方差为指标,研究了侧吹氧枪直径和倾角对熔体流型演化的影响。结果表明,在一定气量下,氧枪直径决定气流速度,当直径为30 mm时熔池内部搅拌效果较好。氧枪倾斜向下10°和15°时,相较于0°的平均气含率方差和平均湍动能分别降低了24%和提高了8%。

The evolution of double-side-blown multiphase flow patterns was numerically simulated by using VOF coupled Realizable k–εturbulence model.The flow pattern evolution process of two-phase blowing multiphase flow was analyzed,and the gas-slag-matte three-phase mixture finally reached"dynamic equilibrium".It is determined that the average turbulent kinetic energy and the variance of average gas holdup are consistent in characterizing the melt mixing uniformity.At the same time,taking the average turbulent kinetic energy and the variance of gas holdup as indicators,the influence of diameter and inclination of side-blown oxygen lance on the evolution of melt flow pattern was studied.The results show that under a certain amount of gas,the diameter of the oxygen lance determines the gas flow rate,and when the diameter is 30 mm,the stirring effect inside the molten pool is better.When the oxygen lance is tilted downward 10°and 15°,the mean gas holdup variance and mean turbulent kinetic energy are reduced by 24%and increased by 8%respectively compared with 0°.