Patent ID: 7143572

Claim:
A gas turbine system comprising: an oxygen generator configured to extract oxygen from air; an oxygen combustion type gas turbine including a methane and oxygen combustor configured to combust methane with the oxygen extracted by the oxygen generator; an exhaust gas condenser configured to separate carbon dioxide from a combustion gas of the gas turbine; a gas compressor configured to compress the carbon dioxide separated by the exhaust gas condenser and nitrogen generated by the oxygen generator; a feed piping configured to feed gas under pressure into an underground coal bed; and a collecting piping configured to collect methane from the coal bed, wherein a compressed gas generated by the gas compressor is fed under pressure into the coal bed through the feed piping to cause the methane to be pushed out and to be collected into the collecting piping, and the collected methane is supplied to the methane and oxygen combustor, thereby inhibiting release of carbon dioxide to atmosphere.