Multiparameter optimization and configuration comparison of supercritical CO_(2) Brayton cycles based on efficiency and cost tradeoff  

作　　者：LIU TianYe YANG JingZe YANG Zhen DUAN YuanYuan 

机构地区：[1]Key Laboratory for Thermal Science and Power Engineering of MOE,Beijing Key Laboratory for CO_(2)Utilization and Reduction Technology,Tsinghua University,Beijing 100084,China

出　　处：《Science China(Technological Sciences)》2021年第10期2084-2098,共15页中国科学（技术科学英文版）

基　　金：supported by the Beijing Natural Science Foundation(Grant No.3202014).

摘　　要：Supercritical CO_(2)Brayton cycle has high efficiency,compactness,and excellent power generation potential.In the design of the cycle,some parameters,such as recuperator pinch point temperature difference(ΔTrec,pp),turbine inlet temperature(Ttur,in),and maximum cycle pressure(pmax),are often preset without optimization.Furthermore,different preferences on efficiency and cost tradeoff can significantly affect the optimal design of the cycle,and the influence of different parameters on the design condition and the optimum cycle configuration becomes unclear as the preference changes.In this study,different preferences on efficiency and cost tradeoff are considered,and the effects of cycle configuration and optimization parameter addition on the tradeoff are investigated.In addition,four configurations under different preferences on tradeoff are recommended.Results show that the design condition parametersΔT_(rec,pp) decrease and T_(tur,in) and pmax increase as the preference of thermal efficiency(W_(th))increases.Different optimized parameters affect the results of the design point and cycle performance.In addition,the simple recuperative cycle and reheating cycle are recommended when low cycle initial cost dominates(W_(th)<0.598),and the recompression cycle and intercooling cycle are recommended when high cycle thermal efficiency dominates(W_(th)>0.701).The decision maker can select appropriate configuration according to specific preferences.

关 键 词：supercritical CO_(2)Brayton cycle multi-objective optimization decision preference optimized parameter analysis cycle configuration comparison 

分 类 号：TM61[电气工程—电力系统及自动化]