Abstract In this paper, a comparative investigation on the supercritical carbon dioxide power cycle for waste heat recovery of gas turbine is carried out. Four categories and six cycles are chosen to represent typical layout of supercritical carbon dioxide power cycle based on thorough literature reviews. The selected cycles are optimized and analyzed based on the results of single- and multi-objective optimization from the perspective of system efficiency, economic cost and configuration complexity. According to the exergy destruction analysis, several guidelines about the heat exchangers are proposed to enhance the thermal efficiency of gas turbine waste heat recovery system, including the avoiding of preheating, the utilization of partial heating layout, the employment of segmentation method and modified logarithmic mean temperature difference, the increase in the number of gas heater. The results indicate that turbine dominates the investment cost of power cycle. In conclusion, dual heated cascade cycle-II should be employed to pursue the maximized system efficiency. Otherwise, partial heating cycle is recommended due to its balanced overall performance.

中文翻译：

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燃气轮机余热回收超临界二氧化碳动力循环对比研究

摘要 本文对用于燃气轮机余热回收的超临界二氧化碳动力循环进行了对比研究。根据详尽的文献综述，选择了四个类别和六个循环来代表超临界二氧化碳动力循环的典型布局。根据单目标和多目标优化的结果，从系统效率、经济成本和配置复杂性的角度对所选循环进行优化和分析。根据火用破坏分析，为提高燃气轮机余热回收系统的热效率，提出了几条关于换热器的指导方针，包括避免预热、利用局部加热布局、采用分段法和修正对数平均法。温差，燃气加热器数量的增加。结果表明涡轮在动力循环的投资成本中占主导地位。总之，应该采用双加热级联循环-II 来追求最大化的系统效率。否则，由于其平衡的整体性能，建议使用部分加热循环。