REVERSIBLE WATER ELECTROLYSIS SYSTEM AND OPERATION METHOD THEREOF

In a reversible water electrolysis system and an operation method of the reversible water electrolysis system, the reversible water electrolysis system includes a reversible water electrolysis fuel cell, a first exhaust passage, a second exhaust passage, a catalytic combustor and an air-exhaust gas heat exchanger. The reversible water electrolysis fuel cell has a hydrogen pole, an air pole and an electrolyte disposed between the hydrogen pole and the air pole. The reversible water electrolysis fuel cell is configured to be operated at one of a water electrolysis mode and a fuel cell mode. The first exhaust passage is configured to transfer a first exhaust gas exhausted at the hydrogen pole. The second exhaust passage is configure to transfer a second exhaust gas exhausted at the air pole. The catalytic combustor is configured to partially receive the first exhaust gas and to heat the second exhaust gas. The air-exhaust gas heat exchanger is equipped at a downstream side of the catalytic combustor and is configured to exchange a heat between an air supplied to the air pole and the second exhaust gas.