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Adiabatic magnesium hydride system for hydrogen storage based on thermochemical heat storage: Numerical analysis of the dehydrogenation

Lutz, Michael and Bhouri, Maha and Linder, Marc and Bürger, Inga (2019) Adiabatic magnesium hydride system for hydrogen storage based on thermochemical heat storage: Numerical analysis of the dehydrogenation. Applied Energy, 236, pp. 1034-1048. Elsevier. DOI: 10.1016/j.apenergy.2018.12.038 ISSN 0306-2619

Full text not available from this repository.

Official URL: https://www.sciencedirect.com/science/article/pii/S0306261918318567

Abstract

With hydrogen becoming more and more important as storage and carrier for renewable energy, there is an increasing need for flexible and efficient storage technologies. However, existing technologies, such as liquefaction or compression, often require a significant share of the hydrogens lower heating value. High-temperature metal hydrides (HT-MHs), such as magnesium hydride, are a promising alternative. Due to high operation temperatures, their application is challenging. A novel adiabatic hydrogen storage reactor based on the combination of a HT-MH with a thermochemical energy storage system (TCSS), such as Mg(OH)2/MgO + H2O, can be a solution. In this work, the previously published numerical simulations for hydrogen absorption are extended to the desorption process. A two-dimensional model for the hydrogen release was set up. The performance of the storage reactor is strongly dependent on the thermodynamic equilibrium of the reactions involved and less dependent on the reaction kinetics. Dehydrogenation is possible within 132 min, which is in the vicinity of the hydrogenation time. To enhance the dehydrogenation process, the water vapor pressure can be adjusted aiming for higher temperatures during the MgO hydration. Hydrogen can either be provided at constant pressure or constant mass flow rate.

Item URL in elib:https://elib.dlr.de/125625/
Document Type:Article
Title:Adiabatic magnesium hydride system for hydrogen storage based on thermochemical heat storage: Numerical analysis of the dehydrogenation
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Lutz, Michaelmichael.lutz (at) dlr.deUNSPECIFIED
Bhouri, Mahamaha.bhouri (at) dlr.deUNSPECIFIED
Linder, Marcmarc.linder (at) dlr.deUNSPECIFIED
Bürger, Ingainga.buerger (at) dlr.deUNSPECIFIED
Date:2019
Journal or Publication Title:Applied Energy
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:236
DOI :10.1016/j.apenergy.2018.12.038
Page Range:pp. 1034-1048
Publisher:Elsevier
ISSN:0306-2619
Status:Published
Keywords:H2 storage; Thermochemical heat storage; Magnesium hydride; Magnesium oxide; Dehydrogenation; Numerical study
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Transport
HGF - Program Themes:Terrestrial Vehicles (old)
DLR - Research area:Transport
DLR - Program:V BF - Bodengebundene Fahrzeuge
DLR - Research theme (Project):V - NGC-Antriebsstrang (old)
Location: Stuttgart
Institutes and Institutions:Institute of Engineering Thermodynamics > Thermal Process Technology
Deposited By: Lutz, Michael
Deposited On:07 Jan 2019 16:49
Last Modified:06 Sep 2019 15:21

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