Status and Evaluation for Process Characteristics of SCO2 Brayton Cycle Layout
To explore the influence of SCO2 Brayton cycle layouts on cycle performance,simple cycle(simple recuperated cycle),advanced cycle(recompression,split expansion,recompression-reheat cycle),and combined cycle(combined reheat cycle and recompression-reheat cycle)were analyzed and compared by applying the variable-controlling method and statistical methods,respectively.The effects of key operating parameters on cycle efficiency were identified and technically evaluated.It is found that the cycle efficiency increases with the increase of the turbine inlet temperature,decreases when the inlet temperature of the main compressor exceeds the critical temperature of CO2,increases and then decreases with the increase of the main compressor inlet pressure,pressure ratio,and split ratio,re-spectively.From a technical point of view,cycle efficiency is positively correlated with the complexity of cycle layout.In particular,the organic Rankine SCO2 recompression reheat cycle and the recompression-reheat cycle are preferred types.From an economic perspective,as the complexity of the cycle increases,the cost also increases.Therefore,the cost should be considered comprehensively to meet the efficiency of the cycle.
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