直流蒸汽发生器动态特性与小破口故障仿真研究

Simulation Research on Dynamic Characteristics and Small Break Fault of Once-through Steam Generator

以B&W直流蒸汽发生器为对象,基于过程仿真软件(APROS)支撑平台中的基本模块,建立了图形化的直流蒸汽发生器仿真模型。对模型进行变工况下的稳态和动态仿真,由结果可知,一次侧入口焓值与二次侧出口压力对稳态特性影响最大,一次侧入口温度对动态特性影响最大。进一步研究直流蒸汽发生器发生换热管破裂事故时,破口位置和破裂程度对其运行特性的影响。结果表明,破口发生位置接近一次侧入口时,对直流蒸汽发生器运行影响最大;换热管破裂对直流蒸汽发生器运行特性的影响随着破裂程度的增加而增大。

Taking a once-through steam generator designed by Babcock & Wilcox as the study object, a graphical model was established, based on the basic module of supporting platform APROS. On this basis, the steady-state and dynamic simulation were carried out under varying operating conditions. According to the results, the enthalpy of the primary inlet and the pressure of the secondary outlet had the greatest influence on its steady-state characteristics, and the temperature of the primary inlet had the greatest influence on its dynamic characteristics. The impact of the position and degree of the breakage on the operating characteristics of the once-through steam generator when the heat exchange tube ruptures was studied further. The results show that it has the largest influence on the operation of once-through steam generator when the rupture takes place in the position near by the primary side’s inlet. And the more the leakage mass flow, the more influence on the operation characteristics of the once-through steam generator.