【摘要】 选用Euler-Euler多相流模型和群体平衡模型,采用多重参考系(multi-reference frame,MRF)方法,分析2KSX(四宽叶旋桨搅拌器)+抛物线圆盘涡轮(parabolic disc turbine,PDT)三层搅拌器反应器内部流场和气液两相分布特性,计算反应器内整体和局部气含率的分布。得出结论:搅拌反应器内上层和中层搅拌桨产生轴向流动,下层搅拌桨产生径向流动,并且和反应器内壁的共同作用下形成一个循环变化的流动;利用宽叶旋浆搅拌器的轴向驱动,及抛物线圆盘涡轮搅拌器的径向驱动作用,提高搅拌反应器的气含率,使其局部气含率的分布较为均匀;搅拌反应器内部的气含率随着搅拌时间的延长而增加,当搅拌26 s之后,内部的气含率基本不再变化,延长搅拌时间并不能增加内部的气含率。更多还原

【Abstract】 The fluid dynamics and the gas-liquid distribution character in a three-layer stirred tank reactor with 2KSX(four wide blade propeller type stirrer) and PDT(parabolic disc turbine) were analyzed with the MRE(multi-reference frame) method based on Euler-Euler and population balance models. The total and local gas-hold were calculated. The conclusions show that: axial flow was produced by double stir upper KSX with radial flow produced by the third layer of PDT, gas-hold was improved with double-upper-layer stirrers axial driven and the lowest stirrer axial driven, gas-hold increased with the stirred time going on, which would not be extended with stirring with the time more than 26 s.更多还原