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High hydrogen storage capacities at low pressures: the adiabatic storage concept

Lutz, Michael und Bhouri, Maha und Linder, Marc und Bürger, Inga (2018) High hydrogen storage capacities at low pressures: the adiabatic storage concept. 22nd WORLD HYDROGEN ENERGY CONFERENCE (WHEC), 2018-06-17 - 2018-06-22, Rio de Janeiro, Brasilien.

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Kurzfassung

State of the art hydrogen storage for mobile applications is based on 700 bar high pressure tanks. However, due to the energy required for compression as well as due to safety aspects, there is still a need for cheap and safe alternative options. In the past years, metal hydrides have been widely discussed, but due to the low storage capacities or high operation temperatures, so far they are not suitable for the mobile sector. A so called adiabatic hydrogen storage reactor for storage materials with high hydrogen capacities and high operation temperatures can be a solution. The basic operation principle of such a reactor has been published before and in this contribution at WHEC2018, the results of further studies will be presented. In short, the operation principle is based on an adiabatic integration of e.g. MgH2 that exhibits a comparatively high gravimetric storage density of up to 7.7 wt%. To absorb or release the heat of reaction of the metal hydride, a thermochemical heat storage material is incorporated into the reactor, e.g. Mg(OH)2. The reactor-design includes two material-compartments being in thermal contact to enable rapid heat transfer. Since both, the hydrogen- and heat storage are gas - solid reactions, the temperatures and pressures in the compartments can be adjusted independently within the operating window of the reactions. The whole reactor is insulated to the environment and does not need any thermal integration, thus it is adiabatic. Without the necessity of external heat management, new areas of application emerge for metal hydrides with high operation temperatures (>200 °C). Compared to a 700 bar hydrogen pressure tank, this new reactor can achieve double the volumetric hydrogen storage density at a pressure below 20 bar, while the gravimetric storage density is about the same. Therefore, the automobile sector and especially heavy-duty vehicles are promising areas of application. In addition, the considered thermochemical materials are very cheap and operate with water vapour. While for the hydrogen release, sufficient water vapour is produced by the fuel cell, in the reverse process, the water vapour can be released to the ambient. In the present work, the previously published numerical 2D simulations for absorption are extended to the desorption process. Furthermore, other possible material combinations as well as their potential storage capacities are presented.

elib-URL des Eintrags:https://elib.dlr.de/124571/
Dokumentart:Konferenzbeitrag (Vortrag)
Titel:High hydrogen storage capacities at low pressures: the adiabatic storage concept
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Lutz, Michaelmichael.lutz (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Bhouri, Mahamaha.bhouri (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Linder, Marcmarc.linder (at) dlr.dehttps://orcid.org/0000-0003-2218-5301NICHT SPEZIFIZIERT
Bürger, Ingainga.buerger (at) dlr.dehttps://orcid.org/0000-0002-6091-0431NICHT SPEZIFIZIERT
Datum:18 Juni 2018
Referierte Publikation:Ja
Open Access:Nein
Gold Open Access:Nein
In SCOPUS:Nein
In ISI Web of Science:Nein
Status:veröffentlicht
Stichwörter:Hydrogen storage, reactor design, Metal hydrides, Numerical study, Thermochemical heat storage
Veranstaltungstitel:22nd WORLD HYDROGEN ENERGY CONFERENCE (WHEC)
Veranstaltungsort:Rio de Janeiro, Brasilien
Veranstaltungsart:internationale Konferenz
Veranstaltungsbeginn:17 Juni 2018
Veranstaltungsende:22 Juni 2018
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Verkehr
HGF - Programmthema:Bodengebundener Verkehr (alt)
DLR - Schwerpunkt:Verkehr
DLR - Forschungsgebiet:V BF - Bodengebundene Fahrzeuge
DLR - Teilgebiet (Projekt, Vorhaben):V - NGC-Antriebsstrang (alt)
Standort: Stuttgart
Institute & Einrichtungen:Institut für Technische Thermodynamik > Thermische Prozesstechnik
Hinterlegt von: Lutz, Michael
Hinterlegt am:10 Dez 2018 15:14
Letzte Änderung:24 Apr 2024 20:28

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