Analysis of Thermodynamics and Economic Performance of Gas Turbine-sCO2 Combined Cycle
To deeply analyze the influence of key parameters of the combined cycle consisting of a gas turbine unit and a sCO2 cycle on the system performance and economy,a thermodynamic model and an e-conomic model of the gas turbine-sCO2 combined cycle were established.Sensitivity analysis of the key parameters was carried out from both thermodynamic and economic perspectives.With the objective of the highest exergy efficiency or the lowest levelized cost of electricity,the key parameters of the system were optimized using a genetic algorithm.The results show that increasing the high-temperature sCO2 turbine inlet temperature and mass flow rate of the sCO2 cycle,and decreasing the sCO2 compressor inlet temper-ature and split ratio can increase the exergy efficiency of the system;there exists an optimal value of each of the above key parameters to minimize the levelized cost of electricity of the system;when the price of natural gas is 4 $/GJ,the optimized system has the highest net power of 463.4 MW,the highest exergy efficiency of 54.67％,the lowest investment cost per unit of installed capacity of 347.16 $/kW,and the lowest levelized cost of electricity is 35.92 $/(MW·h).
gas turbinesCO2 cyclecombined cycleexergy efficiencylevelized cost of electricity
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