METHOD FOR OPERATION OF FUEL CELL SYSTEM

A method of operating a fuel cell system (100) comprises the steps of: generating a hydrogen-containing gas from a gas containing at least one of a nitrogen gas and a nitrogen compound, by a hydrogen generator (2); removing ammonia from the hydrogen-containing gas; detecting a temperature of the hydrogen-containing gas from which the ammonia has been removed; and starting supplying of the hydrogen-containing gas from the hydrogen generator (2) to the fuel cell (7), when the detected temperature of the hydrogen-containing gas is equal to or higher than a predetermined threshold.