高温气冷堆超临界蒸汽发生器的动态仿真与分析

Dynamic Model and Analyses of Supercritical Steam Generator of High Temperature Gas-Cooled Reactor

针对高温气冷堆用螺旋管式直流蒸汽发生器二次侧运行在超临界下的特点,完善其仿真模型。通过模拟一次侧流量阶跃以及一、二次侧流量同步阶跃等场景,研究氦气和给水质量流量的扰动对温度、换热等相关参数的影响规律。结果表明,氦气流量的变化会同时引起一二次侧工质相关参数变化;由于金属传热管和水侧热容较大所产生的延迟作用,使得二次侧参数的变化速率相对缓慢;当氦气和给水流量相继发生变化时,由于超临界水传热的特殊性,部分参数出现小幅波动。

According to the characteristics of steam generator operating under supercritical pressure, the model of supercritical once-through steam generator consisted of helical coils used in HTGR was improved to study the dynamic characteristics of the supercritical steam generator, based on the optimized model and heat characteristics analyses in steady state conditions. Two scenarios, the helium flow rate jump and successive jumps of helium and water flow rates, were simulated to analyze the dynamic responses of various temperatures and heat transfer parameters. The simulation results indicated that the helium flow rate step change had influence on both primary and secondary side parameters. Yet, the secondary side parameters changed more slowly due to the delay effect caused by large heat capacity of metal and water. In the test of successive jumps of helium and water flow rates, some parameters had slight fluctuation, which was attributed to the heat transfer characteristics of supercritical water.