HYDROGEN PRODUCTION APPARATUS AND FUEL CELL SYSTEM

A hydrogen production apparatus 1 includes a burner 10, a combustion tube 11 provided so as to surround flame of the burner 10 and exhausting an exhaust gas of the burner 10 from one side thereof, a reforming unit 6 provided in a tubular shape so as to surround the combustion tube 11 and subjecting a raw fuel and steam to a reforming reaction to generate a reformed gas, an exhaust gas flow path L1 provided in a tubular shape so as to pass through between the combustion tube 11 and the reforming unit 6, fold back at the other side of the reforming unit 6, and extend through outside of the reforming unit 6 on a predetermined side, and passing the exhaust gas exhausted from the one side of the combustion tube 11, a low temperature shift unit 13 provided in a tubular shape on one of inside and outside of an extending portion L1b of the exhaust gas flow path L1 that extends on the predetermined side so as to extend along the extending portion L1b, and subjecting the reformed gas generated in the reforming unit 6 to a shift reaction to reduce a carbon monoxide concentration in the reformed gas, and a preferential oxidation unit 8 provided in a tubular shape on the other of the inside and the outside of the extending portion L1b so as to extend along the extending portion L1b, and preferentially oxidizing the reformed gas subjected to the shift reaction in the low temperature shift unit 13 to further reduce the carbon monoxide concentration.