辅助给水系统超流量分析及改进

Analysis and Improvement of Auxiliary Feedwater System Excessive Flow Based on 1D-3D Models

采用k-ε湍流模型模拟辅助给水系统(ASG)孔板的三维流动状态,获得孔板流速分布、压降分布及流量与压降关系等特性。建立一维的系统仿真模型并验证了模型的有效性,结合数值模拟得到的孔板特性参数,对ASG役前调试期间除氧器超流量报警问题进行仿真验证和分析,提出报警信号延迟的改进方案,有效地解决了除氧器超流量报警的问题。

This paper uses the k-εturbulence model to simulate the three-dimensional flow condition of auxiliary feedwater system(ASG) orifice,and obtains the characteristics of the velocity,pressure distribution and the relationship between flowrate and pressure drop.Subsequently,combined with the calculated orifice characteristics,the one-dimensional simulate model of ASG is established to analyze the alarm problem caused by the gas stripper excessive flow during the pre-service test,whereafter an improvement method for alarm signal delay is presented.The presented method can solve the problems effectively.