Abstract
The present article deals with the possibilities of using metal hydride materials in the construction of hydrogen compressors. For the purpose of continuous operation, a tandem tank connection is used. By increasing the tank temperature, hydrogen pressure increases as well, whereas the heat is transported between the tanks by means of a heat pump. Operating parameters are measured for the purpose analysing prevention of the device failures that occur when the maximum pressure behind the heat pump compressor is exceeded.
Highlights
Efforts to eliminate the drawbacks of high-pressure and cryogenic method of hydrogen storage lead to the use of metal hydride materials that facilitate hydrogen storage through absorption into the metal structure of the alloy
The difference in plateau pressures of MH materials at the acceptable temperature change resulted in the effort to create a hydrogen compressor which would use the heat cycle of MH tank heating and cooling
The present article deals with the possibility of using a heat pump in the construction of a hydrogen compressor using the heat cycle at hydrogen absorption and desorption into metal hydrides
Summary
Efforts to eliminate the drawbacks of high-pressure and cryogenic method of hydrogen storage lead to the use of metal hydride materials that facilitate hydrogen storage through absorption into the metal structure of the alloy. Hydrogen absorption into the alloy begins once the required pressure is achieved; at such pressure, a catalytic effect of the used metals facilitates dissociation of a hydrogen molecule and subsequent diffusion of hydrogen atoms into the intermetallic space of the lattice [1,2,3,4]. The absorption process is accompanied with a slow pressure increase up to the value of complete metal saturation. The plateau pressure, at which the absorption occurs, significantly depends on the alloy temperature [5,6,7,8]. The difference in plateau pressures of MH materials at the acceptable temperature change resulted in the effort to create a hydrogen compressor which would use the heat cycle of MH tank heating and cooling
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