METHOD FOR GENERATING ELECTRICITY BASED ON SUPERCRITICAL CO CYCLE Russian patent published in 2023 - IPC F01K25/08 F02C3/34 

FIELD: heat power engineering.

SUBSTANCE: method for generating electricity based on a supercritical CO₂ cycle includes stages in which gaseous hydrocarbon fuel is supplied to a combustion chamber operating under a pressure of at least 20 MPa, as well as high-purity oxygen and CO₂ circulating in the cycle. The heated gases, consisting predominantly of CO₂, leaving the combustion chamber are directed to a turbine whose operating pressure is at least 20 MPa and the exhaust pressure is at least 7.5 MPa. As gases expand, mechanical work is performed in the turbine, rotating a generator that produces electricity. The gases exhausted in the turbine, the pressure of which is at least 7.5 MPa, are supplied to the hot end of the main regenerative heat exchanger of the thermodynamic cycle, where the exhaust gases are cooled and the water vapor contained in them is condensed, which is then removed from the cycle in liquid form. The CO₂ stream remaining after moisture removal, the pressure of which is higher than the critical pressure of carbon dioxide, enters the aftercooler, where its temperature is reduced to the level of ambient temperature due to heat exchange with it, and the density increases due to the properties of supercritical CO₂. The cooled and compressed CO₂ stream enters the pump, which increases the CO₂ pressure to the operating pressure of the cycle. Part of the CO₂ compressed in the pump goes for recirculation, cooling the highly stressed parts of the turbine, the rest is removed from the cycle. The recirculating CO₂ stream is directed to the cold end of the main regenerative heat exchanger, where it absorbs the heat of the turbine exhaust gases, after which it enters the combustion chamber, and the cycle repeats.

EFFECT: improved reliability and efficiency of electricity generation.

1 cl, 2 dwg