空分填料塔设计中的流体力学特性

空分精馏主要在-200℃左右的深冷条件下进行,填料塔内流体力学特性参数难以由试验直接获取,如何将常压常温状态(简称常态)下空气-水物系的流体力学测试结果转换适用于空分设计变得尤为关键。通过Bain-Hougen公式及SRP(Ⅱ)模型结合Sp iegel持液量计算推导出泛点及压降关联式以预测填料的流体力学特性。对空分中常用的750Y型金属孔板波纹填料进行常态下流体力学特性测试,结果表明:采用的方法可用于填料流体力学特性的预测。对空分状态下的泛点与压降结果预测表明,空分设计中采用常态下的流体力学数据进行设计偏于保守。

Hydrodynamic characteristics of packed columns in air separation

The conversion of packing hydrodynamic characteristics of air-water system from normal conditions to air separation conditions is the key to the design of packed columns in air separation,for it is hard to obtain hydrodynamic data under the condition of-200 ℃.The computing method of the Bain-Hougen formula and the SRP(Ⅱ) model,combining with the Spiegel′s liquid holdup can educe the flooding point and the pressure drop to predict the hydrodynamics of the packing.The experimental result at normal condition of 750Y metal packing shows that this method can well predict the hydrodynamics of the packing.The forecast of the flooding point and the pressure drop in air separation shows that the design of air separation column based on hydrodynamic data under normal conditions is a little conservative.