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Study on the configuration of reverse electrodialysis stack utilizing ammonium bicarbonate solutions

Authors： LUO Xi,LIANG Peng,CAO Xiaoxin,ZHANG Xiaoyuan,Huang Xia

Units： Tsinghua Univestcity

KeyWords： reverse electrodialysis; ammonium bicarbonate; waste heat; configuration

ClassificationCode：TQ028.8

year,volume(issue):pagination： 2013,33(6):6-12

Abstract：

The configuration of a reverse electrodialysis (RED) stack utilizing ammonium bicarbonate solutions was optimized in order to improve the power output. The variation of energy efficiency was also analyzed. The results showed that a maximum power density of 0.85 W/m2 was achieved with the use of five cell pairs and a spacer with a thickness of 0.2 mm when ignoring the power consumption due to the electrode system. Whenthe number ofcell pairs ranged from 2 to 8, the open circuit voltage, internal resistance and maximum power density allimproved gradually with the increase of cell pairs. Meanwhile, the number of cell pairs had a good linear relationship with both the open circuit voltage and internal resistance. The RED stack instead had a reduced power output when the number of cell pairs was over 8. For two spacers with the same type, the thinner one resulted in a decreased internal resistance and thus increased thepower output. For the spacers with the same thickness, the one with a compact woven structure performed better. Energy efficiency of the RED stack stabilized at about 30% during the experiment, which shows it’s promising for energy utilization.
Key words: reverse electrodialysis; ammonium bicarbonate; waste heat; configuration

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AuthorIntro：

罗希（1989），男，湖北省-麻城市人，博士生，主要研究方向为反向电渗析及微生物燃料电池技术。 *通讯联系人E-mail:xhuang@tsinghua.edu.cn基金项目：国家高技术研究发展计划（863）项目（2011AA060907）

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