REFORMER USING OFF GAS, FUEL CELL SYSTEM, AND DRIVING METHOD THEREOF

摘要

PURPOSE: A reformer using unreacted fuel discharged from a fuel cell stack, a fuel cell system, and a driving method thereof are provided to improve fuel efficiency by supplying stable heat to a reformer. CONSTITUTION: A reformer of a fuel cell stack comprises a reforming reaction unit(22) with a space in which flame is generated; a first heating pipe(28) in which a combustion catalyst is built in and unreacted fuel discharged from a fuel cell stack and air are flow in; and a heating unit(24) containing a mixing pipe(27) in which unreacted fuel heated in the first heating pipe and air.