Abstract
A three-stage metal hydride hydrogen compressor (MHHC) system based in AB2-type alloys has been set-up. Every stage can be considered as a Sieverts-type apparatus. The MHHC system can work in the pressure and temperature ranges comprised from vacuum to 250 bar and from RT to 200 °C, respectively. An efficient thermal management system was set up for the operational ranges of temperature desired. It drops temperature shifts due to hydrogen expansion during stage coupling and hydrogen absorption/desorption in the alloys. Each reactor consists of a single and thin stainless-steel tube to maximize heat transfer. These were filled with similar amount of AB2 alloy. The MHHC system was able to produce a compression ratio as high as 84.7 for inlet and outlet hydrogen pressures of 1.44 and 122 bar for a temperature span of 23 °C – 120 °C.
Highlights
The pursuit of sustainable and renewable fuels has increased research on novel technologies
We have considered previous results to develop a three-stage Metal Hydride Hydrogen Compressors (MHHC) prototype system using real operational parameters
In the left panel (figures 3(a), (c) and (e)) raw data are provided, while the right panel (figures 3(b), (d) and (f)), the hydrogenation state of these activation steps with respect to the equilibrium Pressure-Composition isotherms (P-c-I) data of the three alloys at TL = 23◦C is shown
Summary
The pursuit of sustainable and renewable fuels has increased research on novel technologies. Hydrogen is an interesting energy vector due to its high energy content, diversified sources of supply and zero greenhouse gas emissions when produced using primary renewable energies [1, 2] In this regard, hydrogen compressors provide an excellent approach to integrate the production and storage with the distribution of hydrogen as an energy carrier for different applications [3,4,5,6,7,8]. Vanhanen et al [10] studied the feasibility of combined MHHC and heat pump devices through the characterization of various alloys For both devices, AB2-type Hydralloy C2 (Ti0.98Zr0.02Mn1.46V0.41 Cr0.05Fe0.08) and C0 (TiMn1.5V0.45Fe0.1) were used for the first and second stage, respectively. Other prototypes were described by Lototsky et al [3] that covered several ranges of temperatures and pressures to provide different system performances
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