为确切了解蒸馏过程中气体返混对板效率的影响 ,以串联的全混池表征真实的液体流动 ,针对 L ewis第三类塔板 ,建立了模拟气体返混的混合池模型。模型计算值与美国精馏中心 (FRI)实验值的比较表明模型具有较好的可靠性。模拟还表明 ,气体返混对蒸馏过程的影响与汽提因子和点效率有关 ,汽提因子和点效率越大 ,气体返混导致表观板效率下降的程度越大 In order to understand the effect of gas backmixing on the efficiency of the plate during the distillation process, the real liquid flow was characterized by a series of all-mixed tanks. For the third Lewis-Tray plate, a mixed-tank model of simulated gas backmixing was established. The comparison between the model calculated value and the experimental value of FRI shows that the model has good reliability. The simulation also shows that the effect of gas backmixing on the distillation process is related to the stripping factor and the point efficiency. The greater the stripping factor and point efficiency, the greater the decrease in efficiency of the apparent plate due to gas backmixing