Patent ID: 7490472

Claim:
Method for increasing energy and cost efficiency of a combined cycle gas turbine power plant and for energy and cost effective CO 2 capture from a pressurized CO 2 enriched flue gas, the method comprising: at least one of providing and operating a gas turbine power plant comprising one or more gas turbine plants and/or a combined plant of steam and gas turbine cycles, comprising one or more compressor units and one or more turbines and further comprising a combustor; cooling flue gas from the combustor and passing the flue gas through a cleaning unit, the method further including removing at least substantial portions of CO 2 content from the flue gas to obtain cleaned flue gas and reheating the cleaned flue gas and, together with pressurized steams, driving the one or more turbines, and depressurizing the steam prior to being discharged to atmosphere; and operating the combustor such that the combustor is working with two completely separate gas part streams, one of the two gas part streams being kept completely isolated from the innards of a flame tube of the combustor, wherein a first gas part stream is directed internally in the flame tube of the combustor and wherein a second gas part stream passes along an exterior of the flame tube, the first gas part stream comprising additional air and re-circulated un-cleaned flue gas from the combustor which is combusted together with fuel inside the flame tube, and the second gas part stream comprising cleaned flue gas which is heated by the exterior of the flame tube while the flame tube is being cooled.