Abstract: Based on Eulerian-Eulerian multiphase model，the gas-liquid co-current flow of the sieve tray type packing was simulated by CFX. The simulation results showed that the pressure loss through single sieve tray agreed well with the manufacturer,s performance data under smaller kinetic energy factor. The characteristics of velocity and pressure distribution in the flow field were analyzed and the results showed that the mixing of gas and liquid attributed to entrainment by jets；the pressure at the bottom of packing decreased due to vortex and the pressure on the top increased because of jet impinging. The study of pressure drop of sieve tray type packing with various structures indicated that the sieve tray hole diameters and the liquid flow rates were important factors of pressure drop. With smaller hole diameters the influence of liquid flow rate on pressure drop was stronger. When projection of upper floor sieve holes intersected with lower floor sieve holes reduced the pressure drop of single sieve tray effectively. When the liquid flow rate increased，two packing pressure drop curves of various distances between sieve trays intersected at one point. When the gas flow rate was lower than the intersection point，the distance between trays became narrower and the pressure drop on the tray increased. The results showed the opposite while the gas flow was higher than the intersection point.

Key words: gas-liquid co-current flow, sieve tray type packing, Eulerian-Eulerian model, pressure drop simulation

摘要： 基于欧拉-欧拉模型，采用CFX软件对筛板式填料的气液两相并流流动进行了模拟。将模拟所得的压降与填料的出厂特性值进行了对比，发现在液气动能参数较小的情况下，两者吻合较好。分析了该流场内的速度分布和压力分布的特点，射流卷吸作用使流场内两相流体混合，但涡旋使筛板下方压强减小，射流撞击使筛板上方压强增加。对不同结构的矩形筛板式填料的压降进行研究，结果表明：筛板孔径和液相流量是影响筛板压降的重要因素，开孔直径越小，液相流量对单板压降的影响越大；上层筛孔投影与下层筛孔相交的结构更能有效降低单板压降。液相流量较大时，两个不同板间距的单板压降曲线将相交于一点，气相流量低于此交点时，板间距越小，单板压降越大；气相流量高于此交点时，则相反。

关键词: 气液并流, 筛板式填料, 欧拉-欧拉模型, 压降模拟