GAS TURBINE POWER GENERATION SYSTEM, GAS TURBINE POWER SYSTEM, AND STARTING METHOD THEREFOR

PROBLEM TO BE SOLVED: To provide a gas turbine power generation system capable of further improving thermal efficiency when compared with a conventional regenerative microgas turbine. SOLUTION: In this gas turbine power generation system having an intake compressor, a preheating or combustion device, a turbine, a regenerator, and a generator, a second turbine and a second heat cycle mechanism composed of a pressure restoration compressor are provided together on an exhaust side of the turbine to supply exhaust gas of the turbine to the second turbine and expand its outlet pressure excessively below the atmospheric pressure, then its outlet gas is introduced into the pressure restoration compressor after passing through the regenerator to raise its exhaust pressure up to the vicinity of the atmospheric pressure, discharge it into the atmosphere, and drive the generator. Owing to the configuration, quantity of heat discharged to the outside without being converted to work in the inputted heat energy is reduced, an output is increased, and energy utilization efficiency is improved. Furthermore, if exhaust gas of the second turbine is introduced into the pressure restoration compressor after passing through the regenerator and a gas cooling device in the second heat cycle mechanism, an output is increased and thermal efficiency is improved further. COPYRIGHT: (C)2003,JPO