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Study on the influence of series RED stack numbers on energy conversion efficiency in co-flow RED system

Authors： HE Qichen, XU Shiming, WU Xi, WU Debing, HU Junyong, ZHANG Kai, JIN Dongxu, WANG Ping

Units： (Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education, School of Energy and Power Engineering, Dalian University of Technology, Dalian 116024, Liaoning, China)

KeyWords： reverse electrodialysis; series stack; co-flow; energy conversion efficiency; output voltage

ClassificationCode：TQ152

year,volume(issue):pagination： 2018,38(5):23-30

Abstract：

Reverse Electrodialysis stack (RED stack) can convert salinity gradient energy which exists widely in nature or can be made by artificial methods into electricity. To effectively enhance the energy conversion efficiency and output voltage, the model for RED stack energy conversion was developed, which can be used to research on the series multiple stacks (multiple electrodes) in a co-flow RED system. The effects of total flow passageway length of RED, solution flow velocity and series RED stack numbers on energy conversion efficiency and output characteristics of RED system were discussed. Simulation results show that under the given operation parameters, reducing solution flow velocity and increasing total flow passageway length and RED stack numbers can improve power generation efficiency of the system. But the growth rate will be down with flow passageway length and RED stack numbers increasing continuously. The increase of series RED stack numbers not only enhances the output voltage and power density of the system, but also improves the internal resistance, which leads to a significant influence of system output current on output voltage and power density.

Funds：

国家自然科学基金项目“基于溶液浓度变化的‘热-电’转换循环特性基础研究”（51776029）；国家自然科学基金青年科学基金项目“逆电渗析法热-电转换系统匹配工质对的溶解与电导特性研究”（51606024）

AuthorIntro：

第一作者简介：何其琛（1992-），男，山西省原平人，硕士研究生，研究方向为逆电渗析发电数值模拟，Email: hqc420711536@mail.dlut.edu.cn *通讯作者：徐士鸣（1957-），男，博士，教授，博士生导师，Email: xsming@dlut.edu.cn

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