Process for the operation of a gas turbine plant

A process for operating a gas turbine plant, the gas turbine plant using CO2 as a working medium, the process comprising:

• combusting hydrocarbons to flue gases, the flue gases comprising CO2 and H2O in at least one combustion chamber of the gas turbine plant, where the hydrocarbons are combusted in a CO2 atmosphere enriched with oxygen;
• expanding the flue gases within a turbine stage of the gas turbine plant where the turbine stage follows the at least one combustion chamber;
• compressing the flue gases in a compressor stage of the gas turbine plant;
• condensing the flue gases at least partially such that at least a portion of the CO2 and the H2O is liquefied and partially drawn off together with uncondensed flue gas components;
• compressing a main portion of the CO2 with a pump unit of the gas turbine plant where the main portion of the CO2 is a portion of the CO2 not drawn off during the condensing operation;
• preheating the main portion of CO2 in at least one recuperator stage of the gas turbine plant;
• pre-expanding the main portion of CO2 compressed with the pump unit to a combustion pressure;
• and
• supplying the pre-expanded main portion of CO2 to the combustion chamber at the combustion pressure, wherein the combustion pressure is between 70 and 100 bar.