核动力二回路系统冷凝器启动过程特性仿真研究

The Simulation Study of the Startup Process Characteristics of the Condenser in the Secondary Loop System of Nuclear Power Plant

在核动力二回路系统运行过程中,冷凝器作为整个核动力装置的最终排热设备,是重要的冷源,用于排出汽轮机乏汽所携带的热量,其启动过程是设备调试的关键环节。本文首先针对冷凝器建立物理模型,根据物理模型采用适当的简化假设从而构建冷凝器启动过程的动态仿真数学模型,对于凝结水出口调节阀和循环冷却水进口调节阀采用PID方法进行控制建模。在所构建冷凝器仿真模型的基础上进行启动过程的特性研究。通过冷凝器启动过程仿真,获得冷凝器启动过程各个主要参数响应情况,包括各个参数随时间变化动态特性及凝结水出口调节阀、循环冷却水进口调节阀阀位变动情况。通过对启动过程的仿真可以发现,采用PID方式对凝结水出口调节阀和循环冷却水进口调节阀阀位变动进行调节,冷凝器主要参数在启动过程中的变动较为平稳,不会发生震荡;启动结束后冷凝器达到稳态状态下的参数与实际参数对比误差较小。所构建的冷凝器仿真模型和针对启动过程控制的仿真可以为实际冷凝器的启动、调试过程提供参考。

During the operation of the secondary loop system of nuclear power plant,the condenser is an important cooling source and serves as the final heat removal equipment of the whole thermal cycle.The startup progress of the condenser is the mean part of condenser operation test.In this paper,the physical model for the condenser is first established and the mathematical model for the dynamic simulation of the condenser startup process is built with simplified assumptions.PID control is used for the condensing water outlet valve and the circulating cooling water inlet valve during the startup process.The operation characteristics of the startup process are studied with the condenser simulation model.Through the simulation of the startup process,the variation characteristics of mean parameters with time could be obtained which are relatively stable without oscillations.The valve position change of the condensing water outlet control valve and circulating cooling water inlet control valve could also be simulated in this progress.After the startup,the condenser steady-state parameters have little error compared with design data.The simulation model and startup control process could provide reference for actual condenser operation.