S-I thermochemical cycle: A thermodynamic analysis of the HI-H sub(2O-I) sub(2) system and design of the HI sub(x decomposition section)

It is widely agreed that the most energy consuming part of the Sulphur-Iodine (S-I) thermochemical cycle for hydrogen production is represented by separation processes, especially for the HI decomposition section (HI sub(x section). Therefore, the assessment of the real potential of the S-I cycle re...

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Bibliographic Details
Published in:International journal of hydrogen energy 2009-03, Vol.34 (5), p.2121-2132
Main Authors: Lanchi, M, Ceroli, A, Liberatore, R, Marrelli, L, Maschietti, M, Spadoni, A, Tarquini, P
Format: Article
Language:English
Subjects:
Assessments
Atmospheric pressure
Barometric pressure
Decomposition
Electrolytes
Mathematical models
Separation
Thermodynamics
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Summary:It is widely agreed that the most energy consuming part of the Sulphur-Iodine (S-I) thermochemical cycle for hydrogen production is represented by separation processes, especially for the HI decomposition section (HI sub(x section). Therefore, the assessment of the real potential of the S-I cycle requires an optimization of the separation sections and, hence, a deep knowledge of the thermodynamic behaviour of the systems to be separated. In this paper, a new thermodynamic model for the electrolyte system HI-H) sub(2)O-I sub(2 is proposed and validated on vapour-liquid (V-L) equilibrium data at atmospheric pressure. The model provides a reliable description of the phase equilibria of the ternary system and is applied for the flow-sheeting of the HI) sub(x) section at atmospheric pressure along with the energy assessment of the proposed scheme.
ISSN:0360-3199
DOI:10.1016/j.ijhydene.2008.11.029