基于纤维膜的膜蒸馏界面结晶及清洗再生

doi:10.3785/j.issn.1008-973X.2022.10.022

浙江大学学报(工学版)

2022, Vol. 56

Issue (10): 2104-2108 DOI: 10.3785/j.issn.1008-973X.2022.10.022

化学工程

基于纤维膜的膜蒸馏界面结晶及清洗再生

段蓝翔(

),陈佳明,蔡景成,郭飞*(

)

大连理工大学能源与动力学院，辽宁大连 116024

Interfacial crystal fouling and regeneration of fibrous membrane based membrane distillation

Lan-xiang DUAN(

),Jia-ming CHEN,Jing-cheng CAI,Fei GUO*(

)

School of Energy and Power Engineering, Dalian University of Technology, Dalian 116024, China

全文: PDF(1281 KB) HTML

摘要：

针对膜蒸馏（MD）技术处理高盐溶液时，膜界面出现结晶结垢的问题，以无纺结构的纤维膜为膜蒸馏的分离界面，设定不同的料液初始质量分数和膜蒸馏工况条件，表征含盐溶液在膜界面上的结晶行为，探究膜界面结晶的成核和生长机理，开展膜蒸馏的性能分析和失效分析. 通过降低料液质量分数的方式对已发生界面结晶的膜进行清洗再生实验，研究膜清洗再生后的膜蒸馏性能和恢复机制. 结果表明，NaCl结晶以微小晶粒形式附着在纤维丝上，在近料液的膜界面上形成大块结晶，降低膜蒸馏的跨膜通量. 膜的清洗再生可以恢复跨膜通量，恢复比例与结晶生长程度成负相关.

关键词： 膜蒸馏; 纤维膜; 膜界面; 结晶结垢; 清洗再生

Abstract:

The non-woven fibrous membranes were used as the interfacial barriers aiming at the problem of the crystal fouling appearing on the membrane interface when the membrane distillation (MD) was used to treat high salt water. The various initial salt mass fractions of feed and working conditions were analyzed. The crystal fouling behaviors of high salt water on the membrane interface were characterized. The nucleation and growth mechanism of crystal fouling on the membrane interface were explored. The performance analysis and failure analysis of MD system were conducted. The regeneration experiments were conducted on the membranes with interfacial crystal fouling by reducing the salt mass fraction of feed. The recovery mechanisms and performance of MD after regeneration were analyzed. Results show that NaCl crystals adhere to the fibers in the form of tiny grains, and form large crystals on the membrane interfaces near the feed liquid, which reduces the transmembrane flux of MD. The regeneration of membranes can restore the transmembrane flux of MD, and the restoration ratio is negatively correlated with the crystal growth degree.

Key words: membrane distillation fibrous membrane membrane interface crystal fouling regeneration

收稿日期: 2021-09-17 出版日期: 2022-10-25

CLC:

TQ 028

基金资助: 复杂微纳界面构建及界面热力学研究项目（DUT21JD10）

通讯作者: 郭飞 E-mail: lxduan@mail.dlut.edu.cn;feiguo@dlut.edu.cn

作者简介: 段蓝翔（1997—），男，硕士生，从事膜界面结晶及传热的研究. orcid.org/0000-0001-8841-1530. E-mail： lxduan@mail.dlut.edu.cn

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引用本文:

段蓝翔,陈佳明,蔡景成,郭飞. 基于纤维膜的膜蒸馏界面结晶及清洗再生[J]. 浙江大学学报(工学版), 2022, 56(10): 2104-2108.

Lan-xiang DUAN,Jia-ming CHEN,Jing-cheng CAI,Fei GUO. Interfacial crystal fouling and regeneration of fibrous membrane based membrane distillation. Journal of ZheJiang University (Engineering Science), 2022, 56(10): 2104-2108.

链接本文:

https://www.zjujournals.com/eng/CN/10.3785/j.issn.1008-973X.2022.10.022 或 https://www.zjujournals.com/eng/CN/Y2022/V56/I10/2104

表 1 纤维膜的参数

图 1 纤维膜及膜界面结晶的微观形貌表征

图 2 不同初始质量分数的料液在不同温度条件下的跨膜通量（冷却水温度为（18±1）℃）

图 3 NaCl水溶液在膜蒸馏过程中的结晶示意图

图 4 膜蒸馏过程采用初次使用的膜与清洗再生的膜的功能对比（冷却水温度为(18±1) ℃）

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