Experimental Investigation on Multiphase Bunsen Reaction in the Thermochemical Sulfur–Iodine Cycle
2014
Zhang, Yanwei | Peng, Pingan | Ying, Zhi | Zhu, Qiaoqiao | Zhou, Junhu | Wang, Zhihua | Liu, Jianzhong | Cen, Kefa
The effects of SO₂ flow rate, SO₂ mole fraction, iodine content and water content on the Bunsen reaction were experimentally studied for the thermochemical iodine–sulfur cycle for hydrogen production. One multistage reaction mechanism on the Bunsen reaction has been hypothesized, considering the kinetic characteristics. The appearance of a liquid–liquid equilibrium (LLE) phase separation was in the range of 20–40 min in the apparatus we chose. An increase in iodine content and a decrease in water content improved LLE separation characteristics to the H₂SO₄ phase and HIx phase. The H₂S formation side reaction easily occurred with the increase in water content and decrease in iodine content. The optimal operating condition that the inlet SO₂ mole fraction exceeds 0.12 coupled with initial I₂/H₂O molar ratio exceeding 0.284 has been proposed based on the experimental results, for the criteria of improving the separation characteristics and preventing side reactions.
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