EXHAUSTED HYDROGEN TREATING DEVICE FOR FUEL CELL

摘要

PROBLEM TO BE SOLVED: To provide an exhausted hydrogen treating device for a fuel cell capable of quickly and safely treating the hydrogen contained in the gas exhausted from the fuel cell. SOLUTION: The fuel cell 1 is configured so that a hydrogen electrode 13 and air electrode 14 are installed with a solid highpolymer electrolyte film 12 interposed, wherein the exhaust gas containing hydrogen exhausted from the hydrogen electrode 13 is introduced to this exhausted hydrogen treating device 2 and subjected to a catalyst combustion with the aid of the exhaust gas containing oxygen exhausted from the air electrode 14 as a combustion assisting gas. Overrise of the temperature of the catalyst 22 is suppressed because the thickness of the passage wall 211 of an upstream catalyst 20 with a higher hydrogen concentration in the gas is made greater than the passage wall 212 of an understream catalyst 202 so as to increase the heat capacity per unit volume, and it is possible to hold the whole catalyst 22 at a temperature allowing the catalyst to be combusted safely and efficiently.