膜蒸馏与溶液除湿集成型食品低能耗干燥装置研究  

Low energy consumption drying device for food based on integration of membrane distillation and liquid desiccant dehumidification

作　　者：桂大李 陈东[1] 樊佳琪 谢继红[1] GUI Da-li;CHEN Dong;FAN Jia-qi;XIE Ji-hong(College of Mechanical Engineering,Tianjin University of Science&Technology,Tianjin 300222,China)

机构地区：[1]天津科技大学机械工程学院,天津300222

出　　处：《食品与机械》2020年第3期97-100,共4页Food and Machinery

基　　金：国家自然科学基金项目(编号:21576004)。

摘　　要：提出一种低能耗膜蒸馏与溶液除湿集成型干燥装置,通过除湿干燥单元将物料中的水分转移到除湿溶液中,再通过除湿溶液再生单元将除湿溶液吸收的水分分离排出;给出了装置除湿能耗比(SMER)的估算公式,在典型工况参数下装置的SMER可达6.36kg/(kW·h);以表面经过亲水化处理的热敏性棉纤维为被干燥物料,以质量分数50%的LiBr水溶液为除湿溶液进行除湿干燥单元试验装置研究,实现了物料中水分向除湿溶液中转移,且试验装置具有自稳定和能量自平衡等特性;研制了基于中空纤维束—套管型气隙式膜蒸馏组件的除湿溶液再生试验装置,实现了对质量分数50%的LiBr水溶液的浓缩再生,且再生过程具有很高的分离效率。A low energy consumption drying device based on integration of membrane distillation and liquid desiccant dehumidification was proposed.The basic idea was to transfer the moisture in the material to the liquid desiccant by the dehumidifying-drying unit,and then the moisture absorbed by the liquid desiccant was separated and removed by liquid desiccant regeneration unit.Based on a brief introduction to the structure and principle of the device,an estimation formula for SMER(Specific moisture extraction rate)of the device was given and the SMER of the device can reach 6.36 kg/(kW·h)under typical operating conditions.An experimental device for dehumidifying-drying unit was developed.The heat-sensitive cotton fiber with hydrophilic surface was used as the material to be dried and 50%LiBr aqueous solution was used as the liquid desiccant.And it showed that the moisture in the material was successfully transferred to the liquid desiccant and the experimental device had characteristics such as self-stability and energy self-balance.A liquid desiccant regeneration experimental device based on hollow fiber bundle-sleeve tube air gap membrane distillation module was also developed,and the concentration and regeneration of 50%LiBr aqueous solution was successfully achieved,and the regeneration process had high separation efficiency.

关 键 词：膜蒸馏 溶液除湿 热敏物料 干燥 节能 

分 类 号：TS203[轻工技术与工程—食品科学]