摘要
以膜蒸馏海水淡化为研究背景,引入气液两相流技术,分别将氮气和低压水蒸气通入炭膜管内对膜蒸馏过程进行强化,并通过实验考察不同操作条件下的两相流强化效果。结果表明:通入两种气体后均可有效提高渗透通量,水蒸气的强化效果更好;渗透通量随氮气流量的增大先增大后缓慢减少,随水蒸气流量的增大持续增大;料液入口温度较低和浓度较高时,膜蒸馏两相流强化传质效率较高;料液入口温度越高,氮气与水蒸气的强化传质效率差别越小。研究结果将为进一步探究膜蒸馏强化过程奠定基础。
Gas-liquid two-phase flow was used in desalination processes with membrane distillation. Nitrogen or low-pressure water vapor was piped through tubular carbon membranes and their strengthening effects under different operation conditions were evaluated. The result shows that both nitrogen and low-pressure water vapor can increase permeate flux, and low-pressure water vapor has better strengthening effects. The permeate flux increases and then slightly decreases with the increase of nitrogen flux, while it continuously increases with the increase of water vapor flux. When the feed inlet temperature is low and the salt concentration is high, the flux improvement efficiency via two-phase flow is higher. The difference of flux improvement efficiency between nitrogen and low-pressure water vapor is less obvious when studied at higher feed inlet temperature. This study is useful in further investigation of membrane distillation enhancement processes.
出处
《高校化学工程学报》
EI
CAS
CSCD
北大核心
2018年第1期38-43,共6页
Journal of Chemical Engineering of Chinese Universities
基金
中央高校基本业务费(DUT17JC07)
大连理工大学大学生创新创业训练计划(2016101410481)
关键词
海水淡化
膜蒸馏
过程强化
两相流
炭膜
desalination
membrane distillation
process enhancement
two-phase flow
carbon membrane
