新垂直筛板塔的板效率——传质池与混合池双池模型

Dual-Cell Model for Vertical Sieve Tray Efficiency Prediction

本文对新垂直筛板塔的板效率,提出了传质池与混合池双池模型,推导出气相Murphree板效率数学模型。用实验测定的液体提升量、点效率及板效率数据检验了双池数学模型,计算值与实测值平均偏差4.63％,最大偏差12％。并用数学模型的计算结果绘制了λ、β、N及E_(OG)等因素对板效率影响的关系图。

A mathematical model for predicting tray efficiency of a new vertical sieve tray tower was proposed, considering the characteristics of the gas-liquid cocurrent up-flow in the caps and the liquid mixing between the caps on the tray. The behavior of the tray was represented by a model of dual cell, a mass transfer cell and a liquid mixing cell. The numerical results were summarized in graphs relating the Murphree tray efficiency to the point efficiency, the stripping factor, the degree of liquid circulation and the row number of the caps.The liquid circulation rate was measured in an air-water simulator. Tray absorption efficiency and point efficiency were determined with an air-ammonia-water system in the same simulator.The tray efficiencies calculated from the mathematical model using tha correlations for the liquid circulation rate and the point efficiency were consistent with the experimental results.