International Journal of Hydrogen Energy | 2021
Demonstration of a single-stage metal hydride hydrogen compressor composed of BCC V40TiCr alloy
Abstract
Abstract In this study, demonstration of a one-stage metal hydride hydrogen compressor (MH compressor) by using a BCC alloy was performed. It was estimated that V40Ti22Cr38 could compress approximately 1.6\xa0wt% of hydrogen from 1.0 to 10\xa0MPa in 20–140\xa0°C temperature range from equilibrium theory via pressure-composition-isotherm measurements. For demonstration of an actual MH compressor, a kg-scale experimental system was set up; V40Ti22Cr38 (1.4\xa0kg) was introduced into a 1-inch cylindrical vessel with a heat-medium flow tube outside. As a result, 1.0\xa0MPa of hydrogen can be compressed into the hydrogen cylinder at >10\xa0MPa by hydrogen absorption at 10\xa0°C and desorption at 160\xa0°C for 30\xa0min each (1 cycle/h) to achieve a compression rate of 0.23 Nm3/h and indicate the potential of the practical MH compressors by using BCC alloy.