Multi-fuel Scaled-Down Autothermal Pure H2 Generator: Design and Proof of Concept

This article presents experimental results of an autothermal scaled -down system for H-2 production. Pure atmospheric pressure 11,, separated in situ by Pd-Ag membranes, is produced by steam reforming (SR) of methane, ethanol, or glycerol. Oxidizing the SR effluents in a separate compartment supplies the heat. The oxidation feed is axially distributed to avoid hotspots. The 1.3 L system, comprises 100 cm(2) of membrane area, and generates 112 flow rate equivalent to 0.15 kW at an efficiency of -25%. This process leads to comparable performance when different fuels are used. A mathematical model, validated by the measurements, predicts that increasing the membrane area relative to the outer surface area will substantially increase the efficiency and power output. This design serves as proof of concept for on-board pure generators, with flexible fuel sour es, and holds a great promise to reduce the need for special transport and storage technologies for portable or stationary applications. (C) 2016 American Institute of Chemical Engineers