Journal
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
Volume 46, Issue 45, Pages 23139-23148Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2021.04.129
Keywords
Hydrogen; Sulfur-iodine cycle; HI-I-2-H2O electrolysis; Energy; Exergy
Categories
Funding
- National Natural Science Foundation of China [51606128, 51706144]
- Chenguang Program - Shanghai Education Development Foundation
- Shanghai Municipal Education Commission [18CG51]
- Natural Science Foundation of Shanghai [17ZR1419500]
- Capacity Building Plan for some Non-military Universities and Colleges of Shanghai Scientific Committee [18060502600]
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A novel sulfur-iodine (SI or IS) cycle integrated with HI-I-2-H2O electrolysis for hydrogen production was developed and simulated in this study. The overall energy and exergy efficiencies of the novel SI system are estimated to be 15.3-31.0% and 32.8%, respectively. The HI-I-2-H2O electrolysis section shows the highest exergy efficiency, primarily due to the transformation of overall electricity in the electrolytic cell to exergy.
A novel sulfur-iodine (SI or IS) cycle integrated with HI-I-2-H2O electrolysis for hydrogen production was developed and thermodynamically analyzed in this work. HI-I-2-H2O electrolysis was used to replace the conventional concentration, distillation, and decomposition processes of HI, so as to simplify the flowsheet of SI cycle. And then the new cycle was divided into Bunsen reaction, H2SO4 decomposition and HI-I-2-H2O electrolysis sections. Through incorporating the user-defined module of HI-I-2-H2O electrolysis with Aspen Plus, the cycle was simulated and 0.448 mol/h (10 L/h) of H-2 was produced. The overall energy and exergy efficiencies of the novel SI system were estimated to be 15.3-31.0% and 32.8%, respectively. Most exergy destruction occurred in the H2SO4 decomposer and condenser for H2SO4 decomposition and Bunsen reaction sections, which accounted for 93.0% and 63.4%, respectively. A high exergy efficiency of 92.4% for HI-I-2-H2O electrolysis section with less exergy destruction was determined, mostly due to the transformation of the overall electricity in electrolytic cell to exergy. Appropriate internal heat exchange and waste heat recovery will favor improving the energy and exergy efficiencies. (C) 2021 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
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