压水堆核电机组抽汽改造

Study on Steam Extraction Retrofitting of PWR NPP

压水堆核电汽轮机主要工作在湿蒸汽区,比相同功率火电机组蒸汽流量高,单台机组具有更大的供热能力,适合供暖。借鉴火电机组抽汽供热改造的工程经验,以AP1000压水堆为例,给出汽水分离再热器(MSR)前抽汽改造方案。分析了抽汽供热对机组运行控制、热经济性、安全分析的影响,分析表明改造没有对现有安全分析结论形成挑战,但给运行控制带来挑战,并造成可用能损失。建议循序渐进,在取得运行经验的基础上逐步增大抽汽量。

PWR turbine mainly works in wet-steam zone.Comparing with thermal power plant of the same power,the steam flow rate is higher,and single unit has more heating capacity,thus suitable for heating.Based on experiences of steam extraction retrofitting for the thermal power plant,the retrofitting plan for steam extraction from pipe in front of the MSR of AP1000 PWR.The impact to operation,thermal economy and safety were analyzed,it indicates that retrofitting would not challenge the safety analysis results.But bring challenge to operation and increase the loss of energy available.It suggests that the steam extraction flow should be increased step by step based on the operation experience.