Kinetic analysis of Bunsen reaction with HI existence in the thermochemical sulfur–iodine cycle for hydrogen production
Kinetic analysis of Bunsen reaction with HI existence in the thermochemical sulfur–iodine cycle for hydrogen production
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硫碘热化学循环制氢中HI存在的本生反应动力学分析
DOI：
10.1016/j.applthermaleng.2017.10.005
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发表时间：
2018-01
影响因子：
6.4
通讯作者：
Guomin Cui
中科院分区：
文献类型：
--
作者：
Zhi Ying;Xiaoyuan Zheng;Yao Zhang;Guomin Cui
The sulfur–iodine (SI) cycle is considered as a promising method for large-scale and high-efficiency hydrogen production. The Bunsen reaction in the cycle dominates the following HI and H 2 SO 4 decomposition section and even the whole SI flowsheet. In this work, the detailed kinetics of the Bunsen reaction at practical condition with HI recycled was studied. The effects of operating temperature and initial HI concentration on the overall reaction rate were explored. A SO 4 2-production rate model was proposed based on three elementary reactions, and well described the kinetic process of Bunsen reaction. Both theoretical and experimental results indicated that increasing the initial HI concentration (0–3.08 mol/kg H2O) or operating temperature (303–358 K) enhanced the reaction rate, including the earlier appearance of liquid separation and thermodynamic equilibrium. But the recycled HI should be controlled within 6.17 mol/kg H2O, so as to make the separation of H 2 SO 4 and HIx phase possible. The calculated apparent activation energy for kinetics-controlled reactions (4) and (5) were 8.536 and 21.516 kJ/mol, respectively. These results may contribute to the further optimization and reactor design of the Bunsen reaction in the SI cycle.
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