The aim of this study is to investigate the influences of pulverization and expansion of LaNi 5 on the deformation of metal hydride storage vessels during cyclic hydriding/dehydriding reactions. Three thin-wall vessel configurations, namely hollow, internal gas tunnel, and multi-chamber, are adopted for comparison. Experimental results show the hoop strains induced on the vessel wall by volumetric expansion of LaNi 5 hydrides can not be neglected. Unavoidable pulverization and agglomeration of alloy powders in the hollow vessel result in a greater extent of strain accumulation at a lower position. An internal gas tunnel built in the reaction vessel enhances the hydrogen storage capacity and reduces the expansion deformation in the vessel wall. Built-in separators in the multi-chamber vessel can evenly distribute the alloy powders into various chambers and more effectively lessen densification and agglomeration of alloy powders. Consequently, accumulation of wall strain is significantly reduced in the multi-chamber reaction vessel.
- Cyclic hydriding-dehydriding reactions
- LaNi alloy
- Metal hydride storage vessel
- Thin-wall deformation