基于FBG传感的正渗透膜界面剪切力变化特性

doi:10.11949/j.issn.0438-1157.20180879

化工学报 ›› 2018, Vol. 69 ›› Issue (12): 5120-5129.DOI: 10.11949/j.issn.0438-1157.20180879

基于FBG传感的正渗透膜界面剪切力变化特性

白茹真^1,2, 贾辉^1,2, 张诚³, 王捷^1,2,4, 张宏伟^1,2,4

1. 天津工业大学分离膜与膜过程国家重点实验室, 天津 300387;
2. 天津工业大学环境与化学工程学院, 天津 300387;
3. 天津市光电检测技术与系统重点实验室, 天津 300387;
4. 天津工业大学天津市水质安全评价与保障技术工程中心, 天津 300387

收稿日期:2018-08-01 修回日期:2018-09-23 出版日期:2018-12-05 发布日期:2018-12-05
通讯作者: 贾辉
基金资助:
国家自然科学基金项目（51638011，51578375）；天津市科技计划项目（16PTGCCX00070，14ZCDGSF00128）；天津市应用基础与前沿技术研究计划一般项目（18JCYBJC29100）。

Variation characteristics of shear force on membrane micro-interface of forward osmosis based on FBG sensing

BAI Ruzhen^1,2, JIA Hui^1,2, ZHANG Cheng³, WANG Jie^1,2,4, ZHANG Hongwei^1,2,4

1. State Key Laboratory of Separation Membranes and Membrane Processes, Tianjin Polytechnic University, Tianjin 300387, China;
2. School of Environmental and Chemical Engineering, Tianjin Polytechnic University, Tianjin 300387, China;
3. Tianjin Key Laboratory of Optoelectronic Detection Technology and System, Tianjin 300387, China;
4. Tianjin Engineering Center for Safety Evaluation of Water Quality & Safeguards Technology, Tianjin Polytechnic University, Tianjin 300387, China

Received:2018-08-01 Revised:2018-09-23 Online:2018-12-05 Published:2018-12-05
Supported by:
supported by the National Natural Science Foundation of China (51638011, 51578375), the Science and Technology Project of Tianjin (16PTGCCX00070, 14ZCDGSF00128) and the Application Foundation and Advanced Technology Research Program General Project of Tianjin (18JCYBJC29100).

摘要/Abstract

摘要：

针对正渗透（FO）过程中膜面剪切力的分布式测量问题，基于光纤光栅（FBG）传感技术提出一种膜面剪切力的实时测量方法。研究了不同入口流速对剪切力分布、水通量和反向盐通量的影响，并对膜面的水力学特性进行分析。结果表明，FBG技术能够较好地给出FO膜组件表面流速的变化状况。膜面各位置的剪切力均呈现周期性的变化，在FO膜表面切向方向上，剪切力呈现空间分布的不均匀变化，直接导致了渗透通量的变化。增大入口流速能有效地改善膜面各位置的冲刷作用，但采用较大的入口流速才能使膜面距离入口较远位置的剪切力得到明显的提高。膜组件两侧剪切力的同步增加有利于提高膜通量，但单纯增加剪切力并不能更好地减缓浓差极化而提高水通量。

关键词: 正渗透, 膜, FBG传感, 剪切力分布

Abstract:

A shear-force measurement method based on fiber Bragg grating (FBG) sensing technology is proposed to exert the real-time measurement of shear-force distribution on the membrane in forward osmosis (FO) process. The effects of different inlet flow rates on shear-force distribution, water flux and reverse salt flux (RSF) were investigated, and the hydraulic properties of membrane interface behavior were analyzed. The FBG results show that the FBG technique can better give the membrane shear-force shift in the FO module. The shear-force variation presented identical periodicity, and a non-uniform spatial variation of the shear-force distribution exists along the FO membrane surface, which directly leads to the change of water flux. Besides, the shear could be effectively improved at all locations on the membrane by increasing the inlet flow rate, but the larger flow should be applied to significantly improve the shear force farther from the inlet. The simultaneous increase of the shear force on both sides of the membrane module is beneficial to improve water flux, but simply increasing the shear force couldn't better reduce the concentration polarization (CP) and get higher flux.

Key words: forward osmosis, membrane, FBG sensing, shear force distribution

中图分类号:

TQ028.8

白茹真, 贾辉, 张诚, 王捷, 张宏伟. 基于FBG传感的正渗透膜界面剪切力变化特性[J]. 化工学报, 2018, 69(12): 5120-5129.

BAI Ruzhen, JIA Hui, ZHANG Cheng, WANG Jie, ZHANG Hongwei. Variation characteristics of shear force on membrane micro-interface of forward osmosis based on FBG sensing[J]. CIESC Journal, 2018, 69(12): 5120-5129.

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基于FBG传感的正渗透膜界面剪切力变化特性

Variation characteristics of shear force on membrane micro-interface of forward osmosis based on FBG sensing

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