Abstract: A method to operate a power generation system and the device itself includes an oxy-fuel burner, a first heat exchanger assembly, and a rankine-cycle. The oxy-fuel burner generates an exhaust fluid submitted to an exhaust fluid line and the rankine-cycle is operated with the working media which is circulating separately from the exhaust fluid. The exhaust fluid line is provided with a recirculation line downstream the first heat exchanger assembly and upstream the working media heat exchanger extracting exhaust fluid from the exhaust fluid line, conducting extracted exhaust fluid to a compression unit to increase pressure and injecting downstream the extracted exhaust fluid into the oxy-fuel burner.

Abstract: A power generation system includes an oxy-fuel-burner, a steam cycle, and a recirculation line for feeding a part of working media of the steam cycle into the oxy-fuel-burner. A system and a method provides at least one first feed-water-preheater and wherein the steam cycle joins into the recirculation line downstream the at least one first feed water pre-heater and extracting a tenth working-media-stream from the steam cycle, extracting an eighth working-media-stream as carbon-dioxide downstream the first condenser, wherein the at least one first feed water-preheater is heated with a working media stream extracted from the first steam turbine, namely a fifth working-media-stream.