COMBINED POWER GENERATION SYSTEM AND DIFFERENTIAL PRESSURE REGULATION METHOD FOR COMBINED POWER GENERATION SYSTEM

摘要

PROBLEM TO BE SOLVED: To provide a combined power generation system in which the generation of a differential voltage generated between a fuel electrode and an air electrode can be reduced or prevented, and a differential pressure regulation method for the combined power generation system.SOLUTION: A combined power generation system 1 comprises an SOFC 4, a combustor 9 for combustion of a fuel discharged from the SOFC 4, a gas turbine 10 which is driven by a fuel gas supplied from the combustor 9, a fuel discharge pipe 43 for connection from a fuel electrode 6 of the SOFC 4 to the combustor 9, an air discharge pipe 44 for connection from an air electrode 7 of the SOFC 4 to the combustor 9, and a first pressure release channel 46 and/or a second pressure release channel 47 which connects the fuel discharge pipe 43 and the air discharge pipe 44 and in which, when a differential pressure is generated between the fuel discharge pipe 43 and the air discharge pipe 44, a fluid is caused to flow only in one predetermined direction.