Working fluid compositions for use in semi-closed Brayton cycle gas turbine power systems

摘要

A gas mixture is provided which includes CO₂, steam and oxygen. The gas mixture has characteristics which mimic those of air, so that an air compressor need not be modified to effectively compress the gas mixture. The gas mixture is compressed within the compressor and routed to a combustor where a fuel combusts with the oxygen of the gas mixture and produces an exhaust which is substantially entirely CO₂ and steam. This exhaust can be routed through a turbine and expanded to drive the compressor and output power. A portion of the exhaust is routed to a return duct where excess steam and CO₂ is discharged and oxygen is added to the exhaust sufficient to convert the exhaust back into the original gas mixture. Combustion based power is thus generated with removal of steam and CO₂ in an easily captured form.