FUEL CELL SYSTEM AND ITS CONTROL METHOD

摘要

PROBLEM TO BE SOLVED: To provide a compact bi-temperature-control combination solid oxide fuel cell system which can maintain operation temperature constant of a solid oxide fuel battery cell without using an outside thermal supply or a combustor in a fuel battery. SOLUTION: The fuel cell system provided with a low-temperature solid oxide fuel cell 12 which uses hydrocarbon system gas as fuel and generates power by draining carbon monoxide, hydrogen and unreacted hydrocarbon system gas, and a high-temperature solid oxide fuel cell 14 which generates power with drainage gas 13 from the low-temperature solid oxide fuel cell 12 as fuel, is also provided with a flow divider 21 which divides flow of hydrocarbon system gas 11 supplied from outside into two branches in any ratio, one of which 22 is supplied to the low-temperature solid oxide fuel cell 12 and the other 23 is supplied to the high-temperature solid oxide fuel cell 14.