Patent ID: 8656723

Claim:
An operation control method for a gas turbine for burning low-quality fuel containing high-temperature corrosive impurities, comprising the steps of: making a molten salt map showing the dew point and solidus temperatures of a molten salt in a liquid phase state as a function of pressure, the molten salt being selected on a basis of impurities contained in the low-quality fuel and operation data of the gas turbine, by calculating a dew point and a solidus temperature of molten salt resulting from combustion of the low-quality fuel and causing high-temperature corrosion on high-temperature components of the gas turbine through which high-temperature combustion gas flows using a thermodynamic equilibrium calculation, calculating and indicating a surface temperature and a pressure of the high-temperature components of the gas turbine superposed on the molten salt map to determine a superposition state of the surface temperature and the pressure on a region of molten salt in a liquid phase, predicting a lifetime of the high-temperature components of the gas turbine by estimating a corrosion rate of the high-temperature components, and controlling a flow rate of the low-quality fuel supplied to a combustor on the basis of the prediction of the lifetime of the high-temperature components so that an area of surface temperature and pressure regions of the high-temperature components of the gas turbine superposed on the region of molten salt in the liquid phase on the molten salt map is reduced.