Occurrence of the Bunsen side reaction in the sulfur-iodine thermochemical cycle for hydrogen production

Zhu, Qi; Zhang, Yanwei; Ying, Zhi; Zhou, Junhu; Wang, Zhihua; Cen, Kefa

doi:10.1631/jzus.a1200313

Cited by 8 publications

(1 citation statement)

References 13 publications

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“…17 Up to now, there are some experimental and simulation studies on the three basic chemical reactions that have been carried out. For instance, Zhu et al 18 experimentally investigated the occurrence of Bunsen side reactions and evaluated the effects of three key operating parameters including the I 2 content, H 2 O content, and reaction temperature on the side reactions. Park et al 19 conducted a simulation and experimental study on the H 2 SO 4 decomposition process of the I-S cycle.…”

Section: Introductionmentioning

confidence: 99%

Design and analysis of an iodine‐sulfur thermochemical cycle‐based hydrogen production system with an internal heat exchange network

Wang

Macián‐Juan

2022

Intl J of Energy Research

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The iodine-sulfur (I-S) cycle is one of the most promising thermochemical cycles to produce carbon-free hydrogen on a large scale. The employment of an efficient internal heat exchange network is very essential for the efficiency improvement of the I-S cycle, however, detailed research on this topic is seldomly reported. To enrich the existing research content, an I-S cycle-based hydrogen production system with an internal heat exchange network is proposed in this paper using Aspen Plus. The internal heat exchange network is designed by following the energy cascade utilization principle, and three sets of different heat transfer constraints corresponding to different temperature zones are imposed in the design process. The simulation results show that for the proposed I-S system, more than half of the system energy consumption is used by the distillation processes of two acid solutions, and more than 40% of the system energy consumption is used by the HI concentration and distillation process. Using the internal heat exchange network, about 422 kJ of waste heat (for 1 mol of hydrogen production) can be recovered and the system thermal efficiency is improved by about 4.9%. In addition, an efficiency improvement of about 11.8% can be achieved when the waste heat from the condensers of two distillation columns is completely recovered. In general, the thermal efficiency of the proposed I-S system is estimated to be in the range of 15.8% to 49.8%, and after adopting several common waste heat recovery measures, the system can achieve a promising thermal efficiency of approximately 36.7%.

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Section: Introductionmentioning

confidence: 99%