Study on a lab-scale hydrogen production by closed cycle thermo-chemical iodine–sulfur process
Study on a lab-scale hydrogen production by closed cycle thermo-chemical iodine–sulfur process
复制标题
DOI：
10.1016/j.ijhydene.2010.07.150
复制
发表时间：
2010-10
影响因子：
7.2
通讯作者：
Ping Zhang;Songzhe Chen;Laijun Wang;T. Yao;J. M. Xu
中科院分区：
文献类型：
--
作者：
Ping Zhang;Songzhe Chen;Laijun Wang;T. Yao;J. M. Xu
碘硫热化学制氢工艺是利用高温反应器提供的高温过程热最有前途的方法之一，由中国清华大学核能与新能源技术研究所（INET）开发，该研究所自2005年开始对IS循环进行基础研究。基于基础研究得到的实验结果，在INET设计并构建了一个具有电渗析（EED）功能的实验室规模的封闭循环回路（IS-10）。回路由本生段、HI段和硫酸段三段组成。最近在该回路上成功地进行了闭式循环实验。在HI区段，本生反应产生的hix通过反本生反应不断提纯，用EED浓缩，然后蒸馏得到HI溶液。最后将HI催化分解为h2和i2，转化率为20%。在硫酸段，对硫酸进行连续提纯、精馏浓缩，催化分解为SO2、o2和H2O，转化率为75%。本生工段的水，包括循环水，与HI工段和硫酸工段回收的i2和so2反应，形成两个分离的酸相，形成封闭循环。封闭循环实验持续7 h，产氢速率为10 NL/h，活性炭负载Pt作为HI分解催化剂，铬铁矿铜作为硫酸分解催化剂。本文综述了IS-10的主要特点和闭式循环试验的主要结果。到目前为止，is -10是第二个报道的进行封闭实验的设施，也是第一个嵌入EED进行封闭循环操作的设施。
The Iodine–Sulfur (IS) thermo-chemical process for the production of hydrogen is one of the most promising approaches for use of the high temperature process heat supplied by high temperature reactor, which was developed in the Institute of nuclear and new energy technology (INET) of Tsinghua University, China, and INET initiated the fundamental studies on IS cycle since 2005. Based on the experiment results obtained by fundamental researches, a lab-scaled closed cycle loop (IS-10), which featured in electro-electrodialysis (EED) for hydriodic acid (HI) concentration, was designed and built at INET. The loop was composed of three sections, i.e., Bunsen section, HI section and sulfuric acid section. The closed cycle experiment on the loop was successfully carried out recently. In HI section, HIxproduced by Bunsen reaction was continuously purified through reverse Bunsen reaction, concentrated by EED, and then HI solution was obtained by distillation. Finally HI was catalytically decomposed to H2and I2with the conversion of 20%. In sulfuric acid section, sulfuric acid was continuously purified, concentrated by distillation, and catalytically decomposed to SO2, O2and H2O with the conversion of 75%. In Bunsen section, water, including recycled water, reacted with I2and SO2recycled from HI section and sulfuric acid section to form two separated acids phases, thus to form a closed cycle. The closed cycle experiment lasted for 7 h with the hydrogen production rate of 10 NL/h, with Pt loaded on activated carbon and copper chromite used as the catalysts for HI and sulfuric acid decomposition, respectively. This paper summarizes the main features of IS-10 and the main results of the closed cycle experiment. So far IS-10 is the second reported facility on which closed experiment was carried out, and the first one with EED embedded to perform a closed cycle operation.