HYDROGEN GENERATOR, FUEL CELL SYSTEM INCLUDING HYDROGEN GENERATOR, METHOD OF OPERATING HYDROGEN GENERATOR, AND METHOD OF OPERATING FUEL CELL SYSTEM

摘要

A hydrogen generator of the present invention comprises a reformer (9), a raw material supply unit (2) which supplies a raw material to the reformer (9), a combustor (10) which heats the reformer (9), an air supply unit (13) which supplies air to the combustor (10), a hydrodesulfurization unit (3) which removes a sulfur component from the raw material through a hydrogenation reaction, a heater which heats the hydrodesulfurization unit (3), a desulfurization temperature detector which detects a temperature of the hydrodesulfurization unit (3), a cooling passage (24) through which at least a part of the air supplied from the air supply unit (13) to the combustor (10) flows, to cool the hydrodesulfurization unit (3), and a controller (29) configured to perform control to cause a flow rate of the air supplied to the cooling passage (24) to be higher, when the temperature detected by the desulfurization temperature detector is higher a preset first temperature threshold than when the temperature is equal to or lower than the first temperature threshold.