A simulated model for supercritical carbon dioxide recompression coal-fired power generation system was established by Ebsilon software. The exergy loss distribution of the system was obtained through simulation operation. Moreover

the effects of split ratio

turbine inlet temperature

main compressor outlet pressure and other key parameters on exergy efficiency of each facility and the system were investigated. Meanwhile

a comparative analysis was conducted between the recompression system and the three layout improvement systems of reheat

double reheat and double recompression. The results show that

the largest exergy loss exists in the boiler

then is the recuperator. When different parameters change

the exergy efficiencies of efferent facilities mainly affect the system exergy efficiency. There is an optimal value for the effect of split ratio and main compressor outlet pressure on system exergy efficiency. Among the three layout improvement systems

the double recompression is the optimal system

it mainly increases the exergy efficiency of high temperature recuperator

which increases the system exergy efficiency by 2.896 percentage points.