Hydrogen generating apparatus, method of operating hydrogen generating apparatus, fuel cell system, and method of operating fuel cell system

摘要

A hydrogen generating apparatus or the like is able to detect an excess water state or an excess steam state in the interior of a shift converter or a selective oxidation device. The hydrogen generating apparatus ( 120 ) comprise a hydrogen generator ( 118 ) including a reformer ( 100 ) configured to generate a reformed gas from a material and steam; a shift converter ( 103 ) configured to cause the reformed gas supplied from the reformer ( 100 ) to be subjected to a shift reaction; and a selective oxidation device ( 105 ) configured to decrease a concentration of carbon monoxide in the reformed gas after the shift reaction to a predetermined concentration or less; a temperature sensor ( 116, 117 ) configured to detect one of a temperature of the shift converter ( 103 ) and a temperature of the selective oxidation device ( 105 ); and a controller ( 205 ) configured to determine that excess water or excess steam exists in an interior of the hydrogen generator ( 118 ) when an increasing rate of the temperature detected by the temperature sensor is less than a predetermined threshold.