Design, development, construction and operation of a novel metal hydride compressor

Techno-Economic Analysis of High-Pressure Metal Hydride Compression Systems

“…Results showed that the novel heat transfer system allowed all the downselected materials to potentially achieve the operating pressure (875 bar) at temperatures lower than 150 • C. However, only one of the selected alloys, namely (Ti 0.97 Zr 0.03 ) 1.1 Cr 1. 6 Mn 0.4 , showed more realistic temperature differences in the heat transfer process, making it the best candidate for the proposed application. Cost results, obtained for currently available materials at the industrial level for quantities on the order of 10-50 kg, showed the economic feasibility of the proposed system.…”

“…Gkanas et al [5] propose the use of a two-stage metal hydride compression system to achieve maximum pressure ratios of 22, with a maximum delivery pressure of 320 bar at 130 • C. The first-stage material is an AB 5 alloy, namely LaNi 5 , while the second-stage material is an AB 2 -type material based on Zr-V-Mn-Nb. Karagiorgis et al [6] investigate the use of MH materials to compress hydrogen, using waste heat available at temperatures in the range 10-80 • C. Maximum compression ratios of about 32 were achieved, compressing hydrogen between 7 bar and 220 bar. However, the system is comprised of six-stage metal hydride compressors, using AB 5 and AB 2 materials.…”

Numerical investigation on the operation and energy demand of a seven-stage metal hydride hydrogen compression system for Hydrogen Refuelling Stations

“…The advantages of the MHHCs over the competitive technologies are the simplicity of operation, the absence of moving parts; hence minimise the cost for maintenance and technical support, silent operation, reliability and compactness [14][15][16]. In addition, out of the technical point of view, is important to note that the efficiency of the MHHCs can be drastically improved if solar energy and waste heat from industrial sources will utilised instead of electricity [17][18][19][20]. Despite the advantages of the MHHC's over the mechanical compressors, there is still room for further development.…”

“…For the higher-pressure stages, the Laves Phase AB2-type intermetallics have been extensively used and studied, usually based on the Zr-Ti-Cr-Fe-V family [58][59][60][61][62][63][64]. HYSTORE Technologies Ltd. has developed and demonstrated a six-stage MHHC [18]. The target behind the development of such a complex and potentially expensive system is that the MHHC was able to operate between the temperature range of 10 o C (low temperature) and 80 o C (high temperature), making the system suitable for operation under solar heating and cooling.…”

Development of a high-pressure Ti-Mn based hydrogen storage alloy for hydrogen compression

“…In MHHCs hydrogen interacts with a hydride forming metal, alloy or intermetallic compound at low pressure and temperature to form a metal hydride. Subsequently, an increase in the metal hydride temperature, increases the hydrogen absorption equilibrium pressure allowing hydrogen to be released at higher pressures, the level of which depends on the particular thermodynamic properties of the metal hydride [5,6]. The hydrogen absorption and desorption process are repeated in MHHCs via a cyclic temperature swing operation to produce high-pressure hydrogen [1].…”