Modelling of metal hydride hydrogen compressors from thermodynamics of hydrogen – Metal interactions viewpoint: Part I. Assessment of the performance of metal hydride materials

Abstract

Performances of metal hydrides (MH) for thermally driven H 2 compressors are modelled. PCT characteristics of metal-H 2 systems are used as an input to the modelling. Modelling results are defined by the Pressure-Temperature conditions of the MH. Deriving cycle productivity of MH materials and heat consumption for the compression.

Thermally driven hydrogen compression using metal hydrides

“…Straightforward realization of this approach implies direct measurement of the pressure–composition isotherms at T L (absorption) and T H (desorption) followed by the estimation of ΔC at the specified P L and P H ; see, for example 32,35,38 . However, a more flexible and less time‐ and resource‐consuming procedure is in the use of a modeled PCT diagram covering relevant pressure–temperature range 25,26,51 . The applied PCT model should adequately describe the abovementioned features (plateau length, slope, and hysteresis) in the whole range of temperatures and hydrogen pressures and, as possible, to realistically extrapolate the experimental PCT data out of the ranges where they were collected for the model calibration/refinement of the coefficients by fitting.…”

“…The most important step in designing a multi-stage hydrogen compressor is in aligning hydrogen sorption properties of the MH materials used on the consequent stages taking into account the ranges of required pressures (P L …P H ) and available temperatures (T L … T H ). 16,25,26…”

“…The modelling of MHHCs based on the PCT diagrams of the used MH materials 26,51 uses the PCT model earlier developed by Lototskyy. 52 Despite semi-empirical character of the model, its complexity and associated calculation difficulties, it allows to simulate performances of singleand multistage MH compressors with reasonable accuracy.…”

Ti–Mn hydrogen storage alloys: from properties to applications

“…Compared with the traditional mechanical hydrogen compression, this method has many advantages, including quietness, reliable safety, environmental friendliness, efficient hydrogen purication and low maintenance cost. 94,95 TiMn 2 -based alloy is suitable for the integrated storage and compression of hydrogen because of its good hydrogen absorption and desorption cycle performance, high hydrogen storage capacity, easy activation, good poisoning resistance, relatively low cost and wide adjustable range of hydrogen absorption and desorption platform. Klyamkin et al 96 found that the plateau pressure of hydrogen absorption and desorption of TiMn 2 -based alloy can even reach hundreds of atmospheres.…”

“…Compared with the traditional mechanical hydrogen compression, this method has many advantages, including quietness, reliable safety, environmental friendliness, efficient hydrogen purification and low maintenance cost. 94,95…”