化工进展2017，Vol.36Issue(1)：66-70,5.DOI:10.16085/j.issn.1000-6613.2017.01.009
气隙式膜蒸馏NaCl溶液的两相流强化
Two-phase flow enhancement of air gap membrane distillation for aqueous NaCl solution
摘要
Abstract
Gas-liquid flow technology was applied to enhance air-gap membrane distillation in seawater desalination. Modified hydrophobic tubular ceramic membrane was adopted in the process and sodium chloride aqueous solution was used as the model seawater in the present experimental study. Effects of solution temperature,solution concentration and gas flow rate on permeate fluxes were examined.Results showed that flux improvement efficiencies for deionized water and sodium chloride solution are 30.36% and 28.57%,respectively,after the formation of two-phase flow by gas piping in the membrane pipe. As the solution temperature is raised,the flux increases significantly and is 12%—44% higher than that without gas piping. As the solution concentration is increased,the flux decreases gradually. With the increase in the gas flow rate,the flux increases before 40 L/h,and then decreases slightly. When volume gas holdup is 0.5,the enhanced effect of two-phase flow is the best under the experimental conditions. Two-phase flow patterns were observed with a high-speed camera, which explained the experimental results well. This fundamental research would establish the foundation for further exploring enhancing methods of membrane distillation in seawater desalination.关键词
膜蒸馏/两相流/传质/海水淡化/气含率Key words
membrane distillation/two-phase flow/mass transfer/seawater desalination/gas holdup分类
化学化工引用本文复制引用
潘艳秋,沈驭臣,闫勋栋,俞路..气隙式膜蒸馏NaCl溶液的两相流强化[J].化工进展,2017,36(1):66-70,5.基金项目
中央高校基本科研业务费专项项目（DUT13JN04）。 （）
