Abstract: A combined cycle power generation plant has parallel, normally-independent power generation trains, each having a gas turbine in line with a heat recovery steam generator. In a “parked” or spinning reserve operational state, combustion is discontinued at the gas turbine of one power generation train, which is placed on a turning gear. Combustion at the other power train is reduced, preferably to a minimum emissions-compliant level (NOx, CO) of the gas turbine operated at low level combustion. A bypass duct with controllable dampers apportions exhaust from the operating gas turbine to the heat recovery steam generators of both power trains. This maintains an elevated temperature in both heat recovery steam generators and enables fast restart.

Abstract: A combined cycle power generation plant has parallel normally-independent power generation trains, each having a gas turbine in line with a heat recovery steam generator. In a “parked” or spinning reserve operational state, combustion is discontinued at the gas turbine of one power generation train, placed on turning fear. Combustion at the other power train is reduced, preferably to a minimum emissions-compliant level (NOx, CO) of the gas turbine operated at low level combustion. A bypass duct with controllable dampers apportions exhaust from the operating gas turbine to the heat recovery steam generators of both power trains. This maintains an elevated temperature in both heat recovery steam generators and enables fast restart.

Abstract: A combined cycle power generation plant has parallel normally-independent power generation trains, each having a gas turbine in line with a heat recovery steam generator. In a “parked” or spinning reserve operational state, combustion is discontinued at the gas turbine of one power generation train, placed on turning fear. Combustion at the other power train is reduced, preferably to a minimum emissions-compliant level (NOx, CO) of the gas turbine operated at low level combustion. A bypass duct with controllable dampers apportions exhaust from the operating gas turbine to the heat recovery steam generators of both power trains. This maintains an elevated temperature in both heat recovery steam generators and enables fast restart.