Artículos de revistas
Theoretical study of the ethanol steam reforming in a parallel channel reactor
Fecha
2012-10Registro en:
Bruschi, Yanina Marianela; Lopez, Eduardo; Schbib, Noemi Susana; Pedernera, Marisa Noemi; Borio, Daniel Oscar; Theoretical study of the ethanol steam reforming in a parallel channel reactor; Pergamon-Elsevier Science Ltd; International Journal of Hydrogen Energy; 37; 19; 10-2012; 14887-14894
0360-3199
CONICET Digital
CONICET
Autor
Bruschi, Yanina Marianela
Lopez, Eduardo
Schbib, Noemi Susana
Pedernera, Marisa Noemi
Borio, Daniel Oscar
Resumen
The ethanol steam reforming (ESR) is studied in a parallel plate reactor with square channels of 500-2000 μm and washcoated with Pd-based catalyst. The endothermic process is co- or countercurrently heated by means of a flue gas stream flowing through contiguous channels. Two contiguous square channels, assumed as representative of the whole reactor behavior, are simulated using both 1D pseudohomogeneous and heterogeneous models for comparison purposes. The influence of the main operating variables, flow configuration and design parameters on the performance of the reformer has been analyzed. The reactor performance is mainly controlled by the heat supply from the flue gas to the process stream. For low inlet temperatures of the ethanol + water feed, the countercurrent flow configuration allows improved heat recuperation and the reactor shows a higher performance. Conversely, when the feed is pre-heated upstream the reactor, the cocurrent scheme appears preferable due to a more favorable axial profile of heat transferred. The channel width has a strong influence on the hydrogen production rate and the residual methane slips when cocurrent operation is selected. For the countercurrent scheme, a more robust design is achieved in terms of ethanol conversion and hydrogen yield for variations in the feed temperature. Moreover, the channel dimension losses influence provided enough small channels are considered. The heat conduction phenomenon through the solid metal wall was studied varying the wall thickness; diminished reactor performance for thicker walls was observed due to a drop in the heat duty.