Prediction of Distillation Column Performance by Computational Mass Transfer Method  

作　　者：孙志民 刘春江 余国琮 袁希钢 

机构地区：[1]State Key Laboratory for Chemical Engineering (Tianjin University) and School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China

出　　处：《Chinese Journal of Chemical Engineering》2011年第5期833-844,共12页中国化学工程学报（英文版）

基　　金：Supported by the National lqatural Science Foundation of China （20736005）.

摘　　要：A computational mass transfer model is proposed for predicting the concentration profile and Murphree efficiency of sieve tray distillation column. The proposed model is based on using modified c＇2 -εc＇ two equations formulation for closing the differential turbulent mass transfer equation with improvement by considering the vapor injected from the sieve hole to be three dimensional. The predicted concentration distributions by using proposed model were checked by experimental work conducted on a sieve tray simulator of 1.2 meters in diameter for desorbing the dissolved oxygen in the feed water by blowing air. The model predictions were confirmed by the experimental measurement. The validation of the proposed model was further tested by comparing the simulated result with the performance of an industrial scale sieve tray distillation column reported by Kunesh et al. for the stripping of toluene from its water solution. The predicted outlet concentration of each tray and the Murphree tray efficiencies under different operating conditions were in agreement with the published data. The simulated turbulent mass transfer diffusivity on each tray was within the range of the experimental result in the same sieve column reported by Cai et al. In addition, the prediction of the influence of sieve tray structure on the tray efficiency by using the proposed model was demonstrated.一个计算集体转移模型为预言集中侧面和筛托盘蒸馏列的 Murphree 效率被建议。建议模型基于用为由考虑从筛洞注射是三的蒸汽与改进关上微分狂暴的集体转移方程修改了二方程明确的表达维。由使用建议模型的预言的集中分布被为使放出在直径在 1.2 米的一个筛托盘模拟器上进行的试验性的工作检查由吹空气的 feed 水里的溶解的氧。模型预言被试验性的测量证实。建议模型的确认被把模仿的结果与 Kunesh 等报导的工业规模筛托盘蒸馏列的表演作比较进一步测试。为从它的水答案脱衣甲苯。在不同操作条件下面的每个托盘和 Murphree 托盘效率的预言的插头集中与出版数据一致。每个托盘上的模仿的狂暴的集体转移扩散性在在蔡等报导的一样的筛列的试验性的结果的范围以内。另外，由使用建议模型的托盘效率上的筛托盘结构的影响的预言被表明。

关 键 词：simulation concentration field computational mass transfer computational fluid-dynamics tray efficiency sieve tray turbulent mass transfer diffusivity 

分 类 号：TQ028.13[化学工程] TS244[轻工技术与工程—制糖工程]