Gas turbine combined plant and method of operating the same

摘要

A piping guides exhaust gas of a gas turbine to a heat recovery steam generator (HRSG). The piping is provided at a n outlet of the exhaust gas and is branched into two at a branch portion upstream of the HRSG, with one connected to a high-pressure superheater provided in the HRSG and the other connected to a regenerator. The exhaust gas supplied to the high-pressure superheater superheats saturated steam generated by a high-pressure evaporator in the HRSG. The exhaust gas supplied to the regenerator is heat-exchanged with the combustion air generated by a compressor in the gas turbine. The exhaust gas having been heat-exchanged is supplied to between the high-pressure superheater and the high-pressure evaporator via another piping extending between the regenerator and the HRSG.