Method for power generation high efficiency using a fluid circulating work carbon dioxide

A method for power generation comprising: introducing a fuel (254) containing carbon, O2 (242) and a fluid (236) circulating CO2 in a combustion chamber (220), being introduced CO2 at a pressure of at least about 12 MPa and a temperature of at least about 400 ° C; combusting the fuel (242) containing carbon to provide a stream (40) of combustion product comprising CO 2, having the current (40) combustion product temperature of at least about 800 ° C; expanding the stream (40) of combustion products through a turbine (320) for generating power taking the turbine (320) an input for receiving the stream (40) of combustion product and an outlet for releasing a current (50 ) discharge turbine comprising CO2, wherein the ratio of the pressure of the stream (40) of the combustion product at the inlet compared to the pressure of stream (50) having turbine at the outlet is less than about 12; removing heat from the stream (50) having turbine passing current (50) discharge through a turbine unit (420) of primary heat exchange to provide a stream (60) cooled turbine discharge; removing the current (60) cooled turbine discharge one or more secondary components present in the stream (60) further turbine discharge CO2 cooled to provide a stream (65) discharging cooled purified turbine; compressing the stream (65) cooled turbine discharge, purified with a first compressor (630) to a pressure above the critical pressure of CO2 to provide a current (66) circulating fluid supercritical CO2; cool the stream (66) circulating fluid supercritical CO2 to a temperature where its density is at least about 200 kg / m3; passing the fluid (67) circulating high density CO2, supercritical through a second compressor (650) for pressurizing the fluid (70) circulating CO2 pressure required for entrance into the combustion chamber; passing (70) circulating CO2 at high pressure, high density supercritical through the same unit (420) sharing primary heat so that the extracted heat is used to increase the temperature of fluid (70) circulating CO2; supplying an additional amount of heat (Q) to the fluid (70) circulating CO2 at high pressure, high density, supercritical, to increase the temperature of the fluid (70) circulating CO2 so that the difference between the fluid temperature ( 70) circulating CO2 exiting the unit (420) primary heat exchange to recirculate the combustion chamber (220) and the temperature of the stream (50) having turbine is less than about 50 ° C; and recirculating the fluid (70) circulating high density CO2, supercritical heated to the combustion chamber.