FUEL CELL SYSTEM AND OPERATION METHOD FOR FUEL CELL SYSTEM

摘要

Disclosed is a fuel cell system that controls condensation in a CO removal device during the period before a purge is performed, while further improving energy conservation over existing systems. The fuel cell system is equipped with a controller (13), and a hydrogen generation device (1) equipped with an oxidation gas supply unit (23) that supplies oxidation gas to the CO removal device (15). When halting power-generating operation, the controller performs at least either a first control that, before halting the power-generating operation, controls a manipulated variable of the oxidation gas supply unit in a manner such that the amount of oxidation gas supplied in relation to the amount of hydrogen-containing gas supplied to the CO removal device (15) is larger than during the power-generating operation (i), or a second control that, after halting the power-generating operation, controls the manipulated variable of the oxidation gas supply unit during a period in which hydrogen-containing gas is delivered by a reformer (14) in a manner such that the amount of oxidation gas supplied in relation to the amount of hydrogen-containing gas supplied to the CO removal device is larger than during the power-generating operation (ii); and after performing at least either the first control or the second control, the controller performs a purge within the hydrogen generation device.