摘要
碘硫循环是一种优选的热化学分解水制氢工艺,其中HI-I2-H2O物料中HI的浓缩是工艺得以高效运转的前提。采用自行设计的膜电解池(EED Cell)和膜电解池堆(EED Stack),对HI-I2-H2O进行HI的膜电解浓缩实验。通过监测电解电压以及物料的组成变化,对浓缩效果进行评价,分析温度、电流密度、物料浓度等对膜电解池堆效率的影响规律。实验结果表明,EED可有效浓缩HI,使其超越恒沸点浓度,将EED池体组建为EED堆可有效拓展EED的处理能力;EED电压受到温度、料液浓度等因素的影响,其中温度的影响最为显著。
Iodine-Sulfur thermochemical cycle is one of the most promising massive hydrogen production methods. Iodine-Sulfur cycle produces hydrogen with the hydrogen iodide （HI） decomposition reaction, which means that efficient separation of HI from HIx solution （ HI-H2O-I2 mixture） produced in the Bunsen reaction step is very im- portant. Because of the presence of azeotrope at HI： H2O≈1：5 （molar ratio）, conventional distillation consumes a lot of excess heat and cannot produce pure HI. Therefore, the concentration of HI is a necessary process for effi- cient operation. Electro-electrodialysis （EED） cell and EED stack including 2 cell units （5cm × 5cm） were de- signed and applied for the treatment of HIx solution, using Nation 117 as PEM, and ISO graphite as electrodes. The results show that EED can concentrate HI effectively, even to the over-azeotropic concentration, especially benefit- ted from the structure of EED stack composing 2 or more single EED units. The effects of temperature, current den- sity and electrolyte component on the EED performance were studied, and the effect of temperature is the most obri- OUS.
出处
《太阳能学报》
EI
CAS
CSCD
北大核心
2012年第10期1824-1828,共5页
Acta Energiae Solaris Sinica
基金
国家自然科学基金(20806044)
国家科技重大专项(2010ZX06901)
关键词
膜电解
碘化氢浓缩
碘硫循环
制氢
electro-electrodialysis
HI concentration
iodine-sulfur process
hydrogen production
作者简介
通讯作者：陈崧哲（1975-），男，博士、高级工程师，主要从事核能制氢方面的研究。chenszh@mail．tsinghua．edu．cn
