针对以燃煤锅炉为热源的超临界CO2发电系统，采用集约化和新型轴系布置策略的设计理念，结合动力机械理论和热力学计算模型，对千兆瓦级超临界CO2透平进行几何结构设计以及性能评估。结果表明:所设计的千兆瓦级超临界CO2透平包含一个2×3级高压缸和一个2×3级中低压缸，功率分别达到618.1和743.6 MW，总功率为1 361.7 MW。与同级别千兆瓦级超超临界汽轮机比较，超临界CO2透平具有较为显著的技术经济性能。设计结果可为千兆瓦级超临界CO2透平的设计、优化和运行提供参考。

With the compact concept and the novel shafting layout strategy, a gigawattlevel supercritical CO2 turbine using coalfired boilers as the heat source, was designed and evaluated based on the theory of turbomachinery and thermodynamics.The results show that the proposed supercritical CO2 turbine consists of a 2×3 stage highpressure turbine and a 2×3 stage lowpressure turbine,with the stage powers of 618.1 MW and 743.6 MW,respectively,and the total power up to 1 361.7 MW.Compared to the samelevel ultrasupercritical steam turbine,the supercritical CO2 turbine is superior in the techniceconomic performances.The results can provide a positive reference for design,optimization and operation of the gigawattlevel supercritical CO2 turbines.

国家自然科学基金（51106099,50976072）