By using the Ebsilon software

simulation research on 600 MW supercritical carbon dioxide(S-CO_2) Brayton cycle coal-fired power generation system is carried out. The effects of inlet/outlet pressure of main compressor

inlet pressure of reheat turbine

compression shunt coefficient and main/reheat steam temperature on thermodynamic performance of the system are analyzed. The results show that

the generation power and cycle efficiency of the system increase with the main and reheat steam temperature. There exists an optical value for the inlet and outlet pressure of the main compressor. The cycle efficiency of the system is greatly affected by the compression shunt coefficient

and the total power consumption of the compressor increases with the compression shunt coefficient

which results in a decrease in the power generation of the system. The influence of reheat turbine inlet pressure on the system cycle efficiency is little. Genetic algorithm is employed to optimize multiple parameters of the power generation system

and the results show that

when the inlet and outlet pressures of the main compressor are 7.94 MPa and 30.94 MPa

and the inlet pressure of the reheat turbine and compression splitting coefficient are 17.88 MPa and 0.30 respectively

the maximum cycle efficiency of the system can reach up to 48.89%.