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  • Conceptual design of a small portable heat integrated methanol steam reformer [Elektronski vir] : high temperature pem fuel cell system
    Lotrič, Andrej ...
    A concept of a highly-integrated system of a methanol steam reformer (MSRr) and a conventional high temperature proton exchange membrane fuel cell (cHT PEMFC) stack for small portable power units was ... investigated. The developed catalyst for low-temperature methanol steam reforming (LT MSRr) allowed the direct thermal coupling of MSRr and a stack of cHT PEMFC at the temperatures below 200 °C. Such integration led to more efficient heat recuperation and resulted in a highly optimized reformer-fuel cell stack system. CuZnGaOx catalyst was synthesized with a co-precipitation method and used for a successful LT MSRr at 180 °C. Kinetic studies were performed in a tubular packed-bed reactor and an empirical power law kinetic model was used to describe the reforming process. The basic design of the prototype system was developed in 3D modeling software, while the reformer geometry was consequently used for an integrated fluid mechanics-reaction kinetics model applying a finite element method. The kinetic parameters obtained were thus included in 3D computational fluid dynamics (CFD) model, which also considered transport phenomena and chemical reaction kinetics. The results of simulations were used to predict an operational point, where the integrated LT MSRr/cHT PEMFC stack system achieved a steady-state auto-thermal operation. It was shown that for the 2-cell cHT PEMFC stack to produce 6.6 W of electric power 0.13 ml min[sup]-1 of liquid water-methanol feed is needed, whereby full conversion of methanol must be attained. The CFD analysis predicts that the designed LT MSRr would achieve only around 87% conversion of methanol. However, improving the methanol conversion further may be easily attained by the subsequent optimization and intensification of the catalysis and the process themselves.
    Vir: ECOS 2016 [Elektronski vir] : proceedings of the 29th International Conference on Efficiency, Cost, Optimisation, Simulation and Environmental Impact of Energy Systems, June 19. - 23. 2016, Portorož, Slovenia (Datoteka P217_Conceptual Design of a Small Portable Heat ... (14 f.))
    Vrsta gradiva - prispevek na konferenci
    Leto - 2016
    Jezik - angleški
    COBISS.SI-ID - 14708507

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