为对以燃煤锅炉为热源的千兆瓦级超临界CO2发电热力透平设计方案进行优化，针对热力透平设计策略和技术经济性进行评价，将单通流和双分流两种设计策略分别应用于千兆瓦级超临界CO2设计。结果表明：基于单通流设计策略的透平热力级为高压缸1×3级和中/低压缸1×3级，基于双分流设计策略的透平热力级为高压缸2×3级和中/低压缸2×3级；从技术性能角度考量，两者热力参数较为接近，单通流功率1 367.5 MW，略高于双分流功率1 361.7 MW；从经济性性能包括叶片应力、轴向推力、设备制造与安装成本等角度综合考量，高压缸、中/低压缸均采用双分流结构较为合理。

To optimize and improve the gigawattlevel supercritical CO2 turbine using coalfired boiler as the heat source,the design strategy and technical and their technoeconomic performances were comprehensively compared.The design strategies with unidirectional flow and bidirectional flow were used.It was found that,the supercritical CO2 turbines are determined to consist of a 1×3 stage highpressure turbine (HPT) and a 1×3 stage intermediatepressure/lowpressure turbine (IP/LPT) for the unidirectional flow strategy,while a 2×3 stage HPT and a 2×3 stage IP/LPT for the bidirectional flow strategy.From the perspective of technical performances,the thermal parameters of the two are similar,and the power for the unidirectional flow (1 367.5 MW) is insignificantly higher than that for the unidirectional flow (1 361.7 MW).However,from the perspective of economic performances including material stress,axial thrust,manufacture and installation,it is recommended to use the design strategy with bidirectional flow for both HPT and IP/LPT.

TK14