关键词: 气液并流, 筛板式填料, 欧拉-欧拉模型, 压降模拟

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