自制疏水性聚偏氟乙烯(PVDF)中空纤维膜膜组件,采用二乙醇胺(DEA)溶液为吸收液进行二氧化碳吸收实验,研究了在膜接触器中的微孔膜润湿随操作时间的变化,以及吸收液浓度和温度对膜润湿的影响.实验结果表明,随着吸收过程的进行,膜润湿百分率逐渐增加;膜润湿随着DEA溶液浓度的增大而下降;升高温度促进了微孔膜的润湿.利用微孔膜渗入机理、Fick定律和膜孔径对数分布函数,我们提出了膜吸收过程中膜润湿百分率随时间变化的理论方程,并且对实验数据进行了拟合,得到了较好的拟合效果;同时理论上分析了膜润湿对总传质系数的影响.
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