Journal
NUCLEAR ENGINEERING AND TECHNOLOGY
Volume 52, Issue 2, Pages 279-286Publisher
KOREAN NUCLEAR SOC
DOI: 10.1016/j.net.2019.07.033
Keywords
SI (sulphur-iodine) cycle; HIx system; Reactive distillation; Simulation; Hydrogen production
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Funding
- Bhabha Atomic Research Centre (BARC), India [2009/36/97-BRNS/3228]
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In this article, we develop a reactive distillation (RD) column configuration for the production of hydrogen. This RD column is in the HI decomposition section of the sulphur- iodine (SI) thermochemical cycle, in which HI decomposition and H-2 separation take place simultaneously. The section plays a major role in high hydrogen production efficiency (that depends on reaction conversion and separation efficiency) of the SI cycle. In the column simulation, the rigorous thermodynamic phase equilibrium and reaction kinetic model are used. The tuning parameters involved in phase equilibrium model are dependent on interactive components and system temperature. For kinetic model, parameter values are adopted from the Aspen flowsheet simulator. Interestingly, there is no side reaction (e.g., solvation reaction, electrolyte decomposition and polyiodide formation) considered aiming to make the proposed model simple that leads to a challenging prediction. The process parameters are determined on the basis of optimal hydrogen production as reflux ratio = 0.87, total number of stages = 19 and feeding point at 8th stage. With this, the column operates at a reasonably low pressure (i.e., 8 bar) and produces hydrogen in the distillate with a desired composition (H-2 = 9.18 mol%, H2O = 88.27 mol% and HI = 2.54 mol%). Finally, the results are compared with other model simulations. It is observed that the proposed scheme leads to consume a reasonably low energy requirement of 327 MJ/kmol of H-2. (C) 2019 Korean Nuclear Society, Published by Elsevier Korea LLC.
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