蒸汽发生器的建模及仿真

摘要

蒸汽发生器能否正常运行直接关系到整个核电站的安全运行。根据蒸汽发生器的结构原理，将蒸汽发生器划分为16个控制体，把蒸汽发生器的上升通道划分为过冷区和沸腾区。为了更好地反映蒸汽发生器的动态过程，在过冷区和沸腾区之间引入了可移动边界。在Matlab软件中用编制好的算法和图元搭建蒸汽发生器仿真模型。给出初始状态下的给水流量进行仿真实验，利用阶跃上升的给水流量做动态扰动实验，得出一次侧冷却剂出口水室温度变化的响应曲线和二次侧蒸汽压力的响应曲线，仿真实验的响应曲线与实际蒸汽发生器工作时的物理状态一致。该数学模型和仿真程序可以反映出蒸汽发生器运行阶段一次侧、二次侧动态响应过程，对蒸汽发生器设计以及装置事故分析有一定的参考价值。%The safety of the nuclear power plant operation directly depends on the working status of Steam Generator (SG). The steam generator is divided into 16 control volumes ac-cording to its structure and principles, and divided the rise of the steam generator for cold ar-ea and boiling area.The risen channel of the steam generator is divided into sub-cooling sec-tion and superheat section. In order to get better reflection of SG’s dynamic process, a movable boundary has been set between them. Programmed algorithm and drawing units were used in matlab to build simulation model of the steam generator. Doing step up feed water flow dynamic disturbance test under the given initial state of feed water flow simula-tion,the primary side coolant outlet water chamber temperature response curves and the sec-ondary side of steam pressure decreased response curve can be obtained. Response curves of the simulation results and the actual physical working state of SG are the same. This mathe-matical model and simulation program can reflect the primary side and secondary side dynamic response process of SG in operation stage, which could have certain reference value in SG design and equipment accident analysis.