气体吹扫对疏水膜的干燥作用  

Drying effect of gas purge on hydrophobic membrane

作　　者：袁娅[1] 吕晓龙[1] 刘治宇[1] 马忠[1] 

机构地区：[1]省部共建分离膜与膜过程国家重点实验室,天津工业大学,材料科学与工程学院,生物化工研究所,天津300387

出　　处：《膜科学与技术》2017年第4期15-19,26,共6页Membrane Science and Technology

基　　金：长江学者和创新团队发展计划(IRT13084);国家自然科学基金(51578376);天津市科技支撑计划项目(15ZZDSF00070)

摘　　要：针对疏水膜的膜孔干燥问题,研究了采用20℃的室温气体吹扫干燥疏水膜的方法.本文首先采用不同流量的吹扫气体对中空纤维膜组件进行吹扫,发现疏水膜存在一个吹扫气体压力限值,此值在0.108~0.144 MPa之间,当吹扫气体压力在此范围内,膜孔中的水可以被全部排出,从而使疏水膜恢复至干燥状态.其次探究了含湿量不同的两种气体对疏水膜的吹扫作用原理,确定气体在吹扫过程中主要表现为吹扫气体的机械剪切力作用而不是气体载湿干燥作用.Aiming at the drying of the membrane pores of the hydrophobic membrane, the method of room temperature gas purging and drying hydrophobic film with 20℃ was studied. In this paper, the hollow fiber membrane module was swept by purging gas with different flow rate, and there was a limit value of purging gas pressure which was between 0. 108 MPa and 0. 14：4 MPa. The water in the membrane pore can be discharged completely, and the hydrophobic membrane can be recovered to the dry state when the purge gas pressure is in the above range. Secondly, the effect of the two kinds of gas with different moisture content on the hydrophobic membrane is explored. The main performance of the gas in the purge process is the mechanical shearing force of the purge gas, rather than the role of gas absorption of water.

关 键 词：气体吹扫压力 膜孔干燥 膜蒸馏 干燥 

分 类 号：TQ051.893[化学工程]