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本文分析了压水堆核电站二回路饱和蒸汽循环的系统热效率及汽轮机高、低压缸排汽湿度与新蒸汽初参数、汽轮机分缸压力比之间的关系．在与他和蒸汽循环比较的基础上，分析了微过热蒸汽循环的系统热效率和高、低压缸排汽湿度受新蒸汽初压、初温及汽轮机分缸压力比的影响。在此基础上，给出了两种循环的比较结果及循环的最佳运行参数范围。
This paper analyzes the system thermal efficiency of the saturated steam cycle of the secondary circuit of PWR nuclear power station and the relationship between the steam turbine exhaust humidity and the fresh steam initial parameters and turbine partial pressure ratio. Based on the comparison with his and steam cycle, the thermal efficiency of the superheated steam cycle system and the humidity of the high and low pressure cylinder exhaust were analyzed. The influence of the initial steam pressure, the initial temperature and the pressure ratio of steam turbine cylinder was analyzed. On this basis, the comparison between the two kinds of cycles and the range of the best operating parameters of the cycle are given.