Dehydrogenation performance of metal hydride container utilising MgH2-based composite
Nyamsi, Nyallang 1Wu, Zhen 2Zhang, Zaoxiao 2Kolesnikov, Andrei 3Lototskyy, Mykhaylo V. 1Pasupathi, Sivakumar1
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作者信息
1. Univ Western Cape
2. Xi An Jiao Tong Univ
3. Tshwane Univ Technol
折叠
Abstract
Mg-based hydrides have gained formidable interest for hydrogen storage applications due to their high intrinsic hydrogen capacity up to 7.6 wt%. However, their ability to absorb/desorb hydrogen is limited by their slow inherent kinetics and the heat and mass transfer within the storage container. The dehydrogenation of the metal hydride material in the container becomes important when coupling with a fuel cell, since the fuel cell requires a constant H-2 flow rate to provide constant power output. In this study, we investigate numerically the dehydrogenation performance of a cylindrical container filled with 300 g of ball milled Mg90Ti10 + 5 wt% C with the objective to identify the operating conditions at which the H-2 flow rate is higher or equal to the threshold for a proper functioning of a fuel cell. The heat exchange in the container is improved by a combination of internal basin-like and external annular fins. The heat transfer characteristics used in the numerical model are determined from the experimental work conducted in our laboratory. The results show that during the dehydrogenation process, at low convective heat transfer coefficient of 5-35 W/m(2) K, the hydride container can supply H-2 to a fuel cell with different power rating from 100 to 250 W for a long period of time with nearly constant flow rate.
Key words
Heat and mass transfer/Hydride container/Extended surfaces/Mg-based hydride composite/Hydrogen desorption/Numerical simulation/OXIDE FUEL-CELL/HYDROGEN STORAGE TANK/TUBE HEAT-EXCHANGER/NUMERICAL-ANALYSIS/TEMPERATURE/SYSTEMS/REACTOR/OPTIMIZATION/SIMULATION/DESORPTION
NSTL
Elsevier