Based on the first and second laws of thermodynamics

parameters of the supercritical carbon dioxide(S-CO_2) recompression cycle

recompression reheat cycle

partial cooling cycle

partial cooling reheat cycle coalfired power generation system were calculated and analyzed by using MATLAB software. Then

the impact of shunt coefficient

outlet and inlet pressure of the main compressor on the system circulation efficiency

equipment and exergy efficiency of the system were discussed respectively

and the four types of circulation systems were compared and analyzed. The results show that the cycle efficiency varies with the same parameters under different cycle layout or the same cycle layout and different operating parameters. There is a shunt coefficient for exergy efficiency and exergy efficiency to reach an optimal value. There is a coupling relationship between the influence of outlet and inlet pressure of the main compressor and the shunt coefficient on the circulation efficiency. For different parameter changes

exergy efficiency of system is mainly affected by exergy efficiency of different equipment. Reheat can increase circulation efficiency and exergy efficiency of the system

while some cooling cycles are relatively less sensitive to parameter changes.