Performance of containers with hydrogen storage alloys for hydrogen compression in heat treatment facilities

摘要

Containers tested in this study constitute the main part of a hydrogen compressor model designed to be used with a furnace for heat treatment. The paper presents the results of hydrogen absorption and desorption for containers with LaNi_(4.8)Sn_(0.2) (45 kg) and LaNi_(4.25)Al_(0.75) (3.5 kg) hydrogen storage alloys. Containers with LaNi_(4.8)Sn_(0.2) and LaNi_(4.25)Al_(0.75) were working within 0.15-3.3 MPa and 0.013-0.22MPa hydrogen pressure ranges, respectively. We present the data on absorption and desorption kinetics, temperature changes of the alloys during the process and absorbed hydrogen quantities. The tests revealed a decrease in hydrogen storage ability of the containers after 53 (LaNi_(4.8)Sn_(0.2)) and 42 (LaNi_(4.25)Al_(0.75)) absorption-desorption cycles. The experiment involving hydrogen absorption from hydrogen-nitrogen mixture showed a significant adverse effect of the presence of nitrogen in the mixture on hydrogen storage ability of LaNi_(4.8)Sn_(0.2) alloy.