摘要
为了经济高效地回收超临界CO_(2)布雷顿循环(SCBC)的余热,分别采用卡琳娜循环(KC)和有机朗肯循环(ORC)作为底循环,设计了SCBC/KC及SCBC/ORC这2种系统方案.对2种方案系统进行参数分析并利用NSGA-Ⅱ多目标遗传算法对联合循环系统进行多目标优化计算,将优化结果与SCBC系统性能进行比较,突出联合循环系统的性能优势.参数分析结果表明:2种联合循环系统热力性能均存在最佳压比;升高底循环膨胀比有助于提升系统热力性能;提高底循环涡轮机进口温度有助于改善系统[火用]经济性能.对比结果表明:优化后的SCBC/KC系统热效率和?效率较优化前SCBC系统分别升高了9.27%和8.69%,[火用]经济成本仅升高了0.92%;SCBC/ORC系统热效率和?效率较优化前SCBC系统分别升高10.73%和10.08%,?经济成本升高了1.87%.通过比较分析可知,SCBC/KC系统更经济,而SCBC/ORC系统更节能.
The Kalina cycle(KC) and the organic Rankine cycle(ORC) were used and modeled as the bottom cycles,to economically and efficiently recover the waste heat of the supercritical carbon dioxide Brayton cycle(SCBC).Parametric analysis was conducted and the NSGA-II multi-objective genetic algorithm was performed for these combined systems to optimize the parameters. The optimization results were compared with the SCBC system performance to display the benefits of combined cycles. Parametric analysis results showed that there was an optimal pressure ratio for the thermodynamic performances of both integrated cycle schemes. The thermodynamic performances of the two schemes were improved by raising the turbo expansion ratio of bottom cycles, and the exergoeconomic performances of the systems were promoted by upping the inlet temperature of the bottom cycle turbine. Comparison results showed that the optimized SCBC/KC system’s thermal efficiency and exergy efficiency increased by 9.27% and 8.69% respectively compared with that of the pre-optimized SCBC system, and its exergoeconomic cost increased by 0.92%. The thermal efficiency and exergy efficiency of SCBC/ORC system increased by 10.73% and 10.08% respectively, and the exergoeconomic cost increased by 1.87%. Comparative analysis showed that the SCBC/KC system was more exergy economical, while SCBC/ORC system was more energy efficient.
作者
余廷芳
宋凌
YU Ting-fang;SONG Ling(School of Advanced Manufacturing,Nanchang University,Nanchang 330031,China)
出处
《浙江大学学报（工学版）》
EI
CAS
CSCD
北大核心
2023年第2期404-414,共11页
Journal of Zhejiang University：Engineering Science
基金
国家自然科学基金资助项目(22068024)
江西省重点研发计划资助项目(2017ACG70012)。
关键词
超临界CO_(2)布雷顿循环
[火用]经济
有机朗肯循环
卡琳娜循环
余热回收技术
性能比较
多目标优化
supercritical carbon dioxide Brayton cycle
exergy economics
organic Rankine cycle
Kalina cycle
waste heat recovery technology
performance comparison
multi-objective optimization
