Patent ID: 9435228
Filing Date: 2016-09-06
CPC Classification: F01K,F22B,F22G,Y02E

Claim Text:
1. An air cooling method for a heat recovery steam generator having inter-stage attemperators and a heat recovery steam generator exhaust gas inlet accepting flow of exhaust gas from a combustion turbine, the method comprising the steps of: beginning cooling air flow when output in megawatts from the combustion turbine is greater than 20% of full load and a combustion turbine steam set point is increasing, the cooling air flow injecting a cooling air into the combustion turbine exhaust or the heat recovery steam generator exhaust gas inlet; and terminating the cooling air flow when the combustion turbine output in megawatts is greater than 80% of full load or heat recovery steam generator exhaust gas inlet temperature is less than the steam set point plus 50° F.