膜科学与技术

碳酸氢铵-反向电渗析模块构型研究

作者：罗希、梁鹏、曹效鑫、张潇源、黄霞

单位：清华大学环境学院环境模拟与污染控制国家重点联合实验室

关键词：反向电渗析；碳酸氢铵；废热；构型

出版年,卷(期):页码： 2013,33(6):6-12

摘要：

为了提高碳酸氢铵-反向电渗析模块的产电性能，对其构型进行了优化，并分析了其能量效率的变化特点。结果表明，当碳酸氢铵-反向电渗析模块采用5对离子交换膜及0.2 mm厚的隔板时，其功率密度可达最大值0.85 W/m2（不计电极系统能量损耗）。膜对数量不超过8时，开路电压、内阻及最大功率密度均随膜对数的增加而逐渐升高，且膜对数与开路电压、内阻均呈现出良好的线性关系；膜对数量大于8时，装置产电性能逐渐变差。对于相同种类的隔板，采用较薄的隔板能减小装置的内阻，其产电性能更好；对于同等厚度的隔板，编织结构紧密的隔板更优。实验中装置能量效率稳定于30%左右，表明其在能量利用方面具有一定优势。

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

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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