Abstract
A tubular-type compact fuel reformer with ceramics honeycomb blocks was fabricated in this study, and was applied to produce hydrogen from methanol, focusing on partial oxidation reaction (POR). In the authors' previous study, 10% enhancement of hydrogen production was observed by placing the reaction region between the two honeycomb blocks (Case-2), compared with a single honeycomb block insertion (Case-1). In the present study, the reaction characteristics of the reformer were investigated by identifying the location and the shape of the reaction region. The streamwise temperature distributions were measured in detail by using a transversal-type thermocouple, and the ion current distributions corresponding to the reaction region were detected by an electrostatic probe. By both measurements, it was confirmed that the reaction front of Case-2 was transferred to more upstream position compared to Case-1. This result suggests that there is an enhancement of preheating of premixed gas, which is due to the heat regeneration of exhaust gas by means of radiation energy exchange between the two honeycomb blocks, and consequently the reaction front moved to more upstream location.
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