SOLID OXIDE FUEL CELL SYSTEM

摘要

PROBLEM TO BE SOLVED: To sufficiently suppress electrochemical oxidation of a fuel battery cell while executing shutdown stop.SOLUTION: A solid oxide fuel cell system (1) comprises: a fuel battery cell (16); a reformer (20); a fuel supply device (38); a water supply device (28); a first oxidant gas supply device (44) which supplies an oxidant gas to the fuel electrode side; a second oxidant gas supply device (45) which supplies an oxidant gas to the oxidant gas electrode side; a fuel cell module (2); a controller (110); backflow preventing means for starting the operation of the stopped fuel supply device and preventing oxidant gas backflow when the temperature in the fuel cell module drops to a first temperature or below after shutdown stop; and oxygen partial pressure difference eliminating means for stopping the fuel supply device and starting the operation of the first oxidant gas supply device when the temperature in the fuel cell module drops to an atmosphere oxidation safety temperature after shutdown stop.SELECTED DRAWING: Figure 8a