SOLID OXIDE FUEL CELL SYSTEM

摘要

Summary To provide a solid oxide fuel cell capable of executing a shutdown stop while sufficiently suppressing fuel cell oxidation. The present invention is a solid oxide fuel cell system (1) having a fuel cell module (2), a fuel supply apparatus (38), a water supply apparatus (28), a generating air supply apparatus (45), a reformer (20), a fuel/exhaust gas passageway for guiding fuel/exhaust gas from a fuel supply apparatus through a reformer to outside; and a controller (110) comprising a shutdown stop circuit; whereby the fuel/exhaust gas passageway functions as a mechanical pressure retention means, maintaining a pressure on the oxidant gas electrode side within the fuel cell module higher than atmospheric pressure, and maintaining a pressure on the fuel electrode side at a pressure higher than the pressure on the oxidant gas electrode side, until the fuel electrode temperature drops to a predetermined oxidation suppression temperature.