摘要
为提出合理的AP1000核电厂甩负荷工况下的净正吸入压头(NPSH)控制方案,有效防止运行中主给水泵组汽蚀,分析了汽蚀原理和除氧器液位控制及压力控制逻辑,并收集数据建立除氧器暂态计算模型,计算结果表明凝结水限流控制在30%及除氧器暂态压力下降率控制为0.001 77 MPa/s整定值时,可以满足主给水泵组防汽蚀控制要求,并由此提出几种典型甩负荷工况防汽蚀控制方案和优化措施,指导系统调试和运行,提高机组运行安全性。
In order to formulate a reasonable NPSH （net positive suction head） control scheme under load rejection conditions of AP1000 nuclear power plants and effectively prevent cavitation in the main feed water pumps during the operation, the cavitation mechanism and the control logics of deaerator water level and pressure are analyzed and the model for deaerator transient calculation is established based on the collected data. The calculation results show that with the setting value of the condensate flow limit at 30% and the deaerator transient pressure decreasing rate at 0.001 77 MPa/s, the NPSH requirements for the main feed water pumps can be met. Therefore, the cavitation prevention schemes and optimization methods for typical load rejection conditions are proposed as the guidance for commissioning and operation to improve the safety of nuclear power plants.
出处
《中国电力》
CSCD
北大核心
2015年第4期66-70,共5页
Electric Power
关键词
核电厂
除氧器
暂态分析
净正吸入压头
控制优化
nuclear power plant
deaerator
transient calculation
net positive suction head
control optimization
