Development and techno-economic analyses of a novel hydrogen production process via chemical looping

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Title: Development and techno-economic analyses of a novel hydrogen production process via chemical looping
Authors: Bahzad, H
Shah, N
Dowell, NM
Boot-Handford, M
Soltani, SM
Ho, M
Fennell, PS
Item Type: Journal Article
Abstract: In this work, a novel hydrogen production process (Integrated Chemical Looping Water Splitting “ICLWS”) has been developed. The modelled process has been optimised via heat integration between the main process units. The effects of the key process variables (i.e. the oxygen carrier-to-fuel ratio, steam flow rate and discharged gas temperature) on the behaviour of the reducer and oxidiser reactors were investigated. The thermal and exergy efficiencies of the process were studied and compared against a conventional steam-methane reforming (SMR) process. Finally, the economic feasibility of the process was evaluated based on the corresponding CAPEX, OPEX and first-year plant cost per kg of the hydrogen produced. The thermal efficiency of the ICLWS process was improved by 31.1% compared to the baseline (Chemical Looping Water Splitting without heat integration) process. The hydrogen efficiency and the effective efficiencies were also higher by 11.7% and 11.9%, respectively compared to the SMR process. The sensitivity analysis showed that the oxygen carrier–to-methane and -steam ratios enhanced the discharged gas and solid conversions from both the reducer and oxidiser. Unlike for the oxidiser, the temperature of the discharged gas and solids from the reducer had an impact on the gas and solid conversion. The economic evaluation of the process indicated hydrogen production costs of $1.41 and $1.62 per kilogram of hydrogen produced for Fe-based oxygen carriers supported by ZrO2 and MgAl2O4, respectively - 14% and 1.2% lower for the SMR process H2 production costs respectively.
Issue Date: 13-Aug-2019
Date of Acceptance: 24-May-2019
DOI: 10.1016/j.ijhydene.2019.05.202
ISSN: 0360-3199
Publisher: Elsevier BV
Start Page: 21251
End Page: 21263
Journal / Book Title: International Journal of Hydrogen Energy
Volume: 44
Issue: 39
Copyright Statement: © 2019 Elsevier Ltd. All rights reserved. This manuscript is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International Licence
Keywords: Science & Technology
Physical Sciences
Chemistry, Physical
Energy & Fuels
Chemical looping
Hydrogen production
Techno-economic evaluation
Heat integration
Sensitivity analysis
09 Engineering
03 Chemical Sciences
Publication Status: Published
Embargo Date: 2020-07-12
Online Publication Date: 2019-07-12
Appears in Collections:Faculty of Engineering
Centre for Environmental Policy
Chemical Engineering
Faculty of Natural Sciences

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