A multi-cascade heat utilizing power generation system is proposed in which carbon dioxide (CO2) generated is partially recovered by adopting the oxygen (O2) combustion method. In the system, a gas turbine is driven by high-temperature working fluid (air) generated by burning fuel. The turbine outlet gas, which has still considerable energy, is used to generate high-pressure super-heated steam and middle-pressure one at a waste heat boiler (WHB). The high-pressure steam is used for driving an expansion turbine, until its pressure becomes the same as the one of the middle-pressure super-heated steam produced at the WHB. Both the middle-pressure steams are utilized as the working fluid of the CO2-recovering non-polluting high-efficiency gas turbine power generation system, in which the heat energy is also utilized cascade-wisely. It was shown that the system had the net power generation efficiency of 48.4% at the lower calorific value base with CO2 recovery rate of 30.1%, and that this efficiency was remarkably high compared with that of a convensional combined-cycle power generation sys-tem in which a CO2 recovery process is incorporated so as to attain the same CO2 recovery rate.
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