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Storage Tank Concept with Improved Dynamics for Complex Hydrides

Utz, Inga and Linder, Marc and Wörner, Antje (2012) Storage Tank Concept with Improved Dynamics for Complex Hydrides. World Hydrogen Conference, 3.-7.06.2012, Toronto, Kanada. (Unpublished)

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Abstract

Hydrogen storage tanks based on complex hydrides (CxH) e.g. NaAlH4, usually show unsatisfactory tank dynamics due to poor intrinsic kinetics of the storage material. In general, high temperatures are necessary for the absorption process in order to overcome these kinetic limitations. With the approach presented in this paper, the absorption dynamics of the storage tank can be drastically improved without negative impact on the gravimetric or volumetric densities due to additional heating devices: A metal hydride (MeH) showing a lower equilibrium pressure but faster reaction kinetics than the CxH is added to the storage tank in order to initiate the reaction of the CxH by heating up the material in a fast exothermal reaction. Therefore, the complex hydride storage tank can be charged - even at low starting temperatures. In the presentation, this new concept will be explained with detailed simulations based on experimental results for reaction kinetics and physical bulk properties. Additionally, an optimal reactor configuration is being developed including the determination of the mass ratio of the MeH and the CxH. Based on the results of this work, slow intrinsic reaction kinetics at low temperatures of future complex hydrides will to some extend not hinder technical applications anymore.

Document Type:Conference or Workshop Item (Speech)
Title:Storage Tank Concept with Improved Dynamics for Complex Hydrides
Authors:
AuthorsInstitution or Email of Authors
Utz, IngaTT/TPT
Linder, MarcTT/TPT
Wörner, AntjeTT/TPT
Date:7 June 2012
Status:Unpublished
Keywords:Hydrogen storage, metal hydride, complex hydride
Event Title:World Hydrogen Conference
Event Location:Toronto, Kanada
Event Type:international Conference
Event Dates:3.-7.06.2012
Organizer:Canadian Hydrogen and Fuel Cell Association, Natural Resources Canada
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Transport
HGF - Program Themes:Terrestrial Vehicles
DLR - Research area:Transport
DLR - Program:V BF - Bodengebundene Fahrzeuge
DLR - Research theme (Project):V - Fahrzeugenergiesysteme (old)
Location: Stuttgart
Institutes and Institutions:Institute of Technical Thermodynamics > Thermal Process Technology
Deposited By: Inga Bürger
Deposited On:18 Jun 2012 16:02
Last Modified:18 Jun 2012 16:02

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