HYDROGEN GENERATION APPARATUS, OPERATION METHOD THEREOF, AND FUEL CELL SYSTEM

A hydrogen generation apparatus includes a feedstock supply device, a hydro-desulfurizer, a feedstock supply flow path, a reformer, a hydrogen-containing gas flow path, a recycle gas flow path, an ejector, an on-off valve, and an abnormality detection unit. The abnormality detection unit includes a pressure detection unit and a controller. In a case where a detected pressure value of the pressure detection unit in a state in which the feedstock supply device operates for supply and the on-off valve is opened is less than a first threshold value, or in a case where a detected pressure value of the pressure detection unit after the on-off valve is closed from the state in which the feedstock supply device operates for supply and the on-off valve is opened is not a second threshold value or is not lower than the second threshold value that is set to be less than the first threshold value, the controller performs at least one among control of making a determination as abnormality, control of giving a notification of a state or abnormality of the hydrogen generation apparatus, and control of stopping driving of the hydrogen generation apparatus.