Abstract: A gas turbine system is configured to inhibit release of carbon dioxide to the atmosphere in such a manner that methane is combusted with oxygen that has been separated from air by an oxygen generator to allow an oxygen combustion type gas turbine to be driven. Carbon dioxide emitted from the turbine is fed under pressure into an underground coal bed along with an air component after separating the oxygen from the air and fixed into the coal bed, and the coal bed methane is collected above the ground by a gas drive action of the gas and supplied to the gas turbine as fuel.

Abstract: The present invention is aimed at providing a gas turbine system, in particular a gas turbine power generation system, which is configured to use a coal bed methane and to collect substantially all of generated carbon dioxide to inhibit release of carbon dioxide to atmosphere. For this purpose, the gas turbine system of the present invention is configured to inhibit release of carbon dioxide to atmosphere in such a manner that methane is combusted with oxygen separated from air by an oxygen generator (3) to allow an oxygen combustion type gas turbine (1) to be driven, carbon dioxide emitted from the turbine is fed under pressure into an underground coal bed (7) along with air component after separating oxygen from air, and fixed into the coal bed (7), and the coal bed methane is collected up above the ground by a gas drive action of the gas and supplied to the gas turbine as fuel.