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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