For gas-steam Combined cycle units

the power output of gas turbine is obviously affected by the ambient temperature

the inlet air(incoming air) being cooled can enhance the power output.An inlet air cooling system of the gas turbine with two operating conditions alternately changed has been presented: in the event of high inlet air temperature

to put inlet air cooling system into operation can effectively increase the power output of said gas turbine;in case the inlet air temperature is low

to put the low-pressure heater into service can increase steam-relieving capacity of the heat recovery boiler through recovering waste heat of the flue gas

enhancing the output power of steam turbine

realizing annually recycling utilization of flue gas's waste heat.Technical and economical analysis

as well as preliminary operation results show that the said inlet air cooling system to have obvious economic benefits.