HTR-10蒸汽发生器的建模及分析

为开发适用于球床模块式高温气冷堆HTR-10的模拟机，采用一体化仿真支撑平台vPower建立了蒸汽发生器的实时热工水力模型。模型以传热方程为基础求解两侧工质及金属管壁的温度和焓，以流体网络为基础求解两侧工质的压力和流量。本文讨论了3种节点划分方案，针对不同节点划分方案的适用范围提出了建议并采用96节点划分方案进行后续研究。此外，通过分析确认了模型在稳态工况下主要参数和分布参数的准确性和合理性，并在100%功率稳态工况的基础上模拟了氦气侧流量阶跃的场景，分析了模型中主要参数的变化过程。动态仿真结果表明，氦气流量阶跃会引起一、二次侧参数不同程度的变化，变化幅度与阶跃程度呈正比，且金属管壁和水侧热容、二次侧参数变化速率相对缓慢，模型再平衡时间较短，表明HTR-10采用的螺旋管式直流蒸汽发生器的热惯性相对较小。

Modeling and Analysis of Steam Generator in HTR-10

In order to develop a simulator for the pebble-bed modular high temperature gas-cooled reactor HTR-10, a real-time thermal hydraulic model of the steam generator was established on the integrated simulation support platform vPower. The model was based on the heat transfer equation to solve the temperature and enthalpy of primary and secondary fluid and the temperature of heat transfer tube, and the flow network tools were used to calculate the pressure and flow rate on both sides. Three kinds of node division schemes were discussed, and recommendations for the application scope of different node division schemes were given. The 96 node division scheme was used for follow-up research. In addition, the accuracy and rationality of the main parameters and distribution parameters of the model under steady-state conditions were confir-ed through analysis. On the basis of 100% power steady-state condition, the helium flow step conditions were simulated, and the changes of the main parameters in the model were analyzed. The dynamic simulation results show that the helium flow step will cause the primary and secondary side parameters to change in different degrees, the change amplitude is proportional to the step degree, and due to the heat capacity of the metal pipe and the water/steam, the change rate of the secondary side parameters is slower than that of the primary side; the rebalancing time of the model is short which indicates that the thermal inertia of the helical tube steam generator used in HTR-10 is relatively small.