Investigation on high-pressure metal hydride hydrogen compressors

It is well known that metal hydrides can be used to compress hydrogen. In the present study, AB5AB5 type and AB2AB2 type multicomponent hydrogen storage alloys have been studied for the purpose of high-pressure hydrogen compression. A single stage metal hydride hydrogen compressor with hydrogen compression rate of 40 L/min and a double stage compressor with hydrogen compression rate of 20 L/min were designed and built to produce high-pressure hydrogen. The single-stage compressor produces high-pressure hydrogen around 45 MPa from 4 MPa feed gas, when hot oil at 170∘C is used as the heat source. The double-stage compressor rather needs only hot water to produce 45 MPa hydrogen.