一种新型气固分离器内两相流动的数值模拟  

Numerical Simulation of Two-Phase Flow in a Novel Gas-Solid Separator

作　　者：周婵[1] 卢春喜[1] 严超宇[1] 

机构地区：[1]中国石油大学(北京)重质油国家重点实验室,北京102249

出　　处：《高校化学工程学报》2009年第3期375-380,共6页Journal of Chemical Engineering of Chinese Universities

摘　　要：采用数值模拟的方法对带有切向开缝中心管式气固分离器的气固两相流进行了研究。计算中对气相采用了雷诺应力模型,对颗粒相采用了Lagrange坐标系下的随机轨道模型。结果表明:气相流场总体特征为拱形空间内气流以切向速度为主绕排气管做旋转运动,切向气速随径向位置的增加而减小。大部分气体通过开缝进入中心排气管而从中心管排出,少部分气体由排气管下方空间返回入口区。颗粒相的引入对气相流场有显著的影响,分离器拱形空间内同一径向位置的气体切向速度明显降低。颗粒由于自身惯性向边壁运动的趋势改变了气相流场分布,使气体更易向中心管内运动,从而达到较高的分离效率。计算得到的分离效率与实测值吻合较好,证明了数学模型的合理性,为进一步优化分离器结构提供了可靠依据。The gas-solid two-phase flow in a tangential slots type separator was studied by using the numerical simulation method. The RSM turbulence model was adopted to describe the gas phase, and the particle stochastic trajectory model in Lagrange coordinate system was used to describe the solid phase. The results show that the tangential velocity of the gas in vaulted space which decreases with the increase of radius is dominative. The gas upflowing in the separator flows around the exhaust pipe and most of it enters into the exhaust pipe through the slots on the pipe wall, and the remainder part of gas returns to the inlet region through the channel below the exhaust pipe. The particle phase has a significant effect on the gas phase flow field, which causes the gas tangential velocity to decrease obviously at the same radial position in the vaulted space of separator. The particles move along the inside wall of the separator in the vaulted space, while more gas enters into the exhaust pipe through slots, and this can enhance the separation efficiency. The calculated separation efficiency agrees well with the experimental data, which validates the suitability of using RSM and particle stochastic model for simulating two-phase flow in this novel separator. The results provide references for the structure optimizing of the separator.

关 键 词：气固分离器 流场 数值模拟 雷诺应力模型 随机轨迹模型 

分 类 号：TQ028.24[化学工程] TQ018