核电高压给水加热器启动过程建模与仿真
Modeling and simulation of the start-up process of a high-pressure feed water heater in a nuclear power plant
张志疆 1田兆斐1
作者信息
- 1. 哈尔滨工程大学 核科学与技术学院,黑龙江 哈尔滨 150001
- 折叠
摘要
为了研究金属材料的热惯性和温度变化速率对高压给水加热器启动过程的动态特性及能耗特性的影响,本文建立了基于两相非平衡模型的核电站高压给水加热器仿真模型.针对高压给水加热器的启动过程开展仿真研究,以抽汽阀门开度和给水焓值为入口扰动边界条件,分析了最大温度变化速率和正常温度变化速率下的启动过程动态特性.研究发现:高压给水加热器仿真模型完成启动后,壳侧压强、水位和给水出口温度等主要参数与设计值误差在 1%以内;为了满足温度变化速率的限制,抽汽阀门开度变化率最快不能超过 75.34%/h,正常变工况运行不得超过 37.24%/h,对高压给水加热器的启动过程有重要指导意义.该仿真模型可以为高压给水加热器启动过程的调试和运行优化提供参考.
Abstract
This study established a simulation model of a high-pressure feed water heater in a nuclear power plant based on a two-phase non-equilibrium model to investigate the effect of thermal inertia and temperature change rate of metal materials on the dynamic and energy consumption characteristics of high-pressure feed water heater during the start-up process.The start-up process of the high-pressure feed water heater was simulated,and the dynamic characteristics of the start-up process under the maximum temperature change and normal temperature change rates were analyzed,taking the opening of the extraction valve and the feed water enthalpy as the inlet disturbance boundary conditions.The results show that after starting the high-pressure feed water heater,the errors of the main parameters,such as shell side pressure,water level,and feed water outlet temperature,are less than 1%.To meet the limit of temperature change rate,the fastest change rate of extraction valve opening should not exceed 75.34%/h and should not exceed 37.24%/h under the normal variable operating condition.It has important guiding signifi-cance for the start-up process of high-pressure feed water heaters.The simulation model can provide a reference for the commissioning and operation optimization of the start-up process of the high-pressure feed water heater.
关键词
高压给水加热器/启动过程/建模与仿真/动态特性/热惯性/温度变化速率/核电站/两相非平衡模型Key words
high-pressure feed water heater/start-up process/modeling and simulation/dynamic characteristic/thermal inertia/temperature change rate/nuclear power plant/two-phase non-equilibrium model引用本文复制引用
出版年
2023
国家科技期刊平台
NSTL
维普
万方数据