Patent ID: 7814742

Claim:
A flue-gas-desulfurization-type integrated coal gasification combined cycle plant comprising: a gasifier configured to convert pulverized coal to a gas fuel; a heat recovery steam generator configured to generate steam; a gas turbine which is operated by the gas fuel and which supplies a combustion exhaust gas to the heat recovery steam generator; a steam turbine which is operated by the steam generated by the heat recovery steam generator; a power generator connected to at least one of the gas turbine system and the steam turbine; a desulfurization equipment configured to desulfurize the combustion exhaust gas discharged from the heat recovery steam generator, the desulfurized combustion exhaust gas being exhausted into the atmosphere; and an acid-resistant feedwater heater configured to preheat boiler feedwater, the acid-resistant feedwater heater being provided at a downstream side of the heat recovery steam generator, wherein the acid-resistant feedwater heater is disposed at an area where the temperature of the combustion exhaust gas is lower than the dew point of sulfuric acid.