Numerical analysis of the electrochemical Bunsen reaction for hydrogen production from sulfur-iodine cycle
Numerical analysis of the electrochemical Bunsen reaction for hydrogen production from sulfur-iodine cycle
复制标题
硫-碘循环制氢电化学本生反应的数值分析
DOI：
10.1016/j.ijhydene.2018.03.021
复制
发表时间：
2018
影响因子：
7.2
通讯作者：
Guomin Cui
中科院分区：
文献类型：
--
作者：
Zhi Ying;Yao Zhang;Xiaoyuan Zheng;Yabin Wang;Guomin Cui
硫-碘(S一号)水裂解循环是最有前途的制氢方法之一。循环中的本森反应影响流程的复杂性和热效率，但最近应用了一种电化学技术来使S-I循环更加简化和节能。然而，目前对电化学本生反应，特别是电解槽内的电极反应的研究还不是很清楚。在这项工作中，发展了一个二维EC的数值模型。考虑了传质和电化学反应的耦合，对详细的反应过程进行了数值计算，并用实验数据进行了验证。考察了各种操作参数对反应的影响。结果表明，电流密度的增大显著提高了反应物的转化率。较高的温度不利于H_2SO_4和H_2SO_4的浓缩。进口流量的增加降低了反应物的转化率，但影响随着流量的进一步增加而减小。并给出了最佳运行条件。理论模拟研究将为改进实验工作提供指导。
The sulfur–iodine (S-I) water-splitting cycle is one of the most promising hydrogen production methods. The Bunsen reaction in the cycle affects the flowsheet complexity and thermal efficiency, but an electrochemical technique has recently been applied to make the S-I cycle more simplified and energy efficient. However, the performance of the electrochemical Bunsen reaction, especially the electrode reactions inside the electrolytic cell (EC) are not clear at present. In this work, a two-dimensional numerical model of EC was developed. The detailed reaction process was numerically calculated with considering the coupling of mass transfer and electrochemical reactions, and was verified using experimental data. The effects of various operating parameters on the reactions were investigated. The results showed that the increase of current density significantly improves the conversion rates of reactants. A higher temperature is unfavorable for concentrating H2SO4and HI. Increase in the inlet flow rate reduces the conversion rates of reactants, but the impact declines with further rising flow rate. An optimal operating condition is also proposed. The theoretical simulation study will provide guidance for the improvement of experimental work.