| 摘要 |
PURPOSE:A mixture of exhaust gas from fuel cells and combustible gas is used and a reformer is composed of a high-temperature combustion catalyst bed, a low-temperature combustion catalyst bed and a heat-transfer packed bed, whereby the volume of the combustion catalysts are reduced to lower the costs, and the formation of hot spots is prevented. CONSTITUTION:The feedstock gas 5 is converted into reformed gas by passing through an inert thermoconductive packed bed 3 and the reformation catalyst bed 2 and the reformed gas is outlet as reformed gas 7 after passing through the inner tube 6. In the meantime, a gas mixture 4 for heating the reforming reactions, which is composed of exhaust air and combustible gas, is passed through the high-temperature combustion catalyst bed 10, the thermoconductive packed bed 9 and the low-temperature combustion catalyst bed 11 and let out as an exhaust gas. Thus, most part of the combustible gas is burnt in the high- temperature combustion catalyst layer 10 and the combustion is completed in the low- temperature combustion catalyst bed 11 which is provided on the place where the combustion gas becomes relatively low in its temperature. Thus, the amount of the catalysts necessary for combustion is saved by an amount corresponding to the thermoconductive packed bed 9. Moreover, since oxidative combustion does not occur in the packed bed 9, hot spots, namely local heating in the reforming tube are not formed by uneven packing of the catalyst. |
