Aiming at the problem of waste heat utilization of gas turbine

the technologies of intermediate cooling

intermediate reheating and split flow recompression were introduced into the supercritical carbon dioxide(S-CO_2)power cycle with heat recovery and six cycle schemes were established. Taking the cycle efficiency and the cycle net output power of the S-CO_2 cycle as the optimization objectives

the genetic algorithm was used to optimize the parameters of each scheme

and the earnings of optimization results were compared. The results show that the cycle efficiency can be improved in varying degrees by introducing one intermediate cooling

one intermediate reheat and one split flow recompression when the optimization goal is to maximize the cycle efficiency. The cycle efficiency of the sixth scheme that introduces one split flow recompression and one intermediate reheat is the highest

which reaches 43.29%. When the optimization goal is to maximize the net cycle output work

the introduction of primary intermediate cooling can increase the net output power

the introduction of primary intermediate reheating can reduce the net output power of the power cycle

and the one split recompression degenerates into no split scheme.The second scheme that introduces primary intermediate cooling has the largest net output power reaching 82 620.02 kW. When the cycle net output work is taken as the optimization objective

the economy of the six schemes is more advantageous because the waste heat utilization efficiency of gas turbine smoke exhaust is higher. The second scheme has the largest operating earnings in 20 years

which is RMB 5.065 billion.