摘要
提出了可在常压下实现热敏料液低温浓缩、且膜通量和热效率均较适宜的液隙式膜蒸馏方法,在简要介绍液隙式膜蒸馏工作原理的基础上,设计制作了中空纤维疏水膜管-壳体-柔性绕管型液隙式膜蒸馏组件,对11°Brix的澄清苹果汁进行了浓缩试验研究,结果表明,当浓缩温度为35.0℃时,膜通量可达0.314 kg/(m^2·h),分离出的冷凝水的糖度低于0.1°Brix;为降低液隙式膜蒸馏浓缩料液的能耗,提出了热泵与液隙式膜蒸馏集成装置,给出了其节能倍率的估算公式,通过典型工况的计算表明,热泵液隙式膜蒸馏装置的节能倍率可达4.88,约与五效真空蒸发装置相当,具有很好的产业化应用优势。
A liquid gap membrane distillation method was proposed which can concentrate heat-sensitive feed liquid at low temperature under normal pressure and whose permeate flux and thermal efficiency are both suitable.Based on a brief introduction to liquid gap membrane distillation principle,a hollow fiber-shell-flexible pipe liquid gap membrane distillation module was developed,and was used to concentrate the apple juice of 11°Brix.The results show that when the concentrating temperature is 35.0℃,the permeate flux can reach 0.314 kg/(m^2·h),and the sugar content of the condensed water separated from the apple juice is less than 0.1°Brix.In order to reduce the energy consumption for feed liquid concentration by liquid gap membrane distillation,an integrated device of heat pump and liquid gap membrane distillation was proposed,and the formula for estimating its energy saving ratio was given.The calculations of typical working conditions show that the energy saving ratio of the heat pump liquid gap membrane distillation device can reach 4.88,which is equivalent to the five-effect vacuum evaporation device,so it shows a good prospect of industrial applications.
作者
于佳男
陈东
曹莹莹
谢继红
Yu Jianan;Chen Dong;Cao Yingying;Xie Jihong(College of Mechanical Engineering,Tianjin University of Science and Technology,Tianjin 300222,China)
出处
《包装与食品机械》
CAS
北大核心
2020年第4期1-4,共4页
Packaging and Food Machinery
基金
国家自然科学基金项目(21576004)。
关键词
膜蒸馏
液隙
苹果汁
浓缩
节能
membrane distillation
liquid gap
apple juice
concentration
energy saving
