HEAT AND REACTION CHARACTERISTICS OF MULTI-STAGE ALCOHOLIC-FUEL REFORMER
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Accession number;07A0043225
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| Title;HEAT AND REACTION CHARACTERISTICS OF MULTI-STAGE ALCOHOLIC-FUEL REFORMER |
| Author;
KUWABARA KEISUKE
(Kyoto Univ., JPN)
TATSUMI KAZUYA
(Kyoto Univ., JPN)
NAKABE KAZUYOSHI
(Kyoto Univ., JPN)
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Journal Title;Thermophys Prop
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Journal Code:X0031A
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ISSN:0911-1743
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VOL.27th;NO.;PAGE.69-70(2006)
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| Figure&Table&Reference;FIG.4, TBL.2 |
| Pub. Country;Japan |
| Language;Japanese |
| Abstract;Low conversion efficiency, load fluctuation and variation of fuel aspect are significant problems in developing a high-efficiency and compact fuel reforming system for on-site hydrogen fuel production. To tackle these problems, in the present study, a multi-stage alcohol fuel reformer, which is composed of multiple ports of reactant supply, is proposed and examined. The local heat balance and temperature inside this reformer can effectively and quickly be controlled resulting in enhancement of the reforming effectiveness and reduction of the undesired exhausts such as soot or CO. In this paper, results of a prototype multi-stage tube type reformer, using methanol as fuel, are reported. The reformer temperature and exhaust gas components were measured, and the effects of stage number, equivalence ratio and of fine-tube-bundle, operating as quasi-porous media, on the reforming characteristics are discussed, mainly focusing on the partial oxidation reaction (POR). Comparing the performance of the reformer under the conditions of with and without fine-tube-bundle, larger H2 flow rate and concentration were obtained under high equivalence ratio conditions with the tube-bundle, compared to those of without the bundle. The reaction ratio of CH3OH, .ALPHA., decreased and the ratio of POR, .BETA., increased as .PHI. increased in both cases. Especially, in the case with the bundle, .BETA. was nearly 90%, which indicated that a higher reforming performance could be obtained in this case. In the two-stage case, the H2 concentration and .ALPHA. did not differ much with the single-stage case. Considering the temperature profile of the reformer wall, this was believed to be ascribable to the fact that at the location of additional air supply (second stage), the temperature in the present apparatus was not sufficiently high enough to retain or enhance the reforming reactions. (author abst.) |
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