Abstract: Distillation is the most widely used for unit operation separation in chemical and petrochemical industries but the prediction of tray efficiency remains a difficult task because of the complexity of hydrodynamics on the tray.In this paper,a three dimensional computational fluid dynamics(CFD)model is developed for describing the hydrodynamics on a sieve tray——Two-Layer Model,in which essential features of sieve tray are fully considered.On a sieve tray working under the foaming condition,two layers of liquid considered are jetting layer which is near the tray bottom resulting from high velocity gas phase emerging from the gas holes,and bubble layer——the upper layer in which gas exists in the form of gas bubbles resulting from the break-up of gas column due to much loss of gas energy.The two-equation k-ε turbulent model is used respectively to the two layers in modeling process considering the different types of interaction between phases.A sieve tray of 1.2 m in diameter is simulated,the results of calculation are reasonable.The calculation is carried out with commercial software Fluent 5.4 of Fluent Inc.

Key words:

CFD, 精馏塔板, 双液层三维模型

摘要： 在充分研究塔板上气液两相之间相互作用的基础上，运用双流体层三维模型，根据气体存在的形态将在泡沫工况下的液层在液体的厚度方向上分为喷射层和鼓泡层，将其特征与计算流体力学（CFD）结合起来，得到和实验观察比较一致的结果.

关键词:

CFD, 精馏塔板, 双液层三维模型