给水旁路调节下高压加热器的瞬态应力分析
摘要：灵活运行下的设备安全性是燃煤电站深度调峰过程的重要问题，高压加热器作为大型高温承压换热设备，在机组灵活性调节中承担重要作用，同时也面临安全性问题。针对某660 MW超临界燃煤发电机组1号高压加热器，建立三维有限元模型，研究给水旁路调节过程下的瞬态温度场、热应力场、机械应力场、耦合应力场分布，并针对水室出口、蒸汽入口、管板上下侧4个关键区域进行应力变化规律的研究。结果表明，热、机械、耦合应力的波动幅度均随着给水旁路程度的增大而增大；热应力最大部位为蒸汽入口管处，机械应力和耦合应力最大部位分别对应管板下侧、管板上侧；管板上侧区域为高压加热器最危险部位，需重点关注和提前检修。
Abstract:The safety of equipment under flexible operation is an important issue in the deep peak shaving process of coal-fired power plants. As large-scale, high-temperature and pressure-bearing heat exchangers, high-pressure heaters play an important role in the flexibility regulation of the unit. However, safety problems are severe. Therefore, a three-dimensional finite element model was established for the No.1 high-pressure heater of a 660 MW supercritical coal-fired power plant, to assess the distributions of transient temperature fields, thermal stress fields, mechanical stress fields and coupling stress fields of the heater under different feedwater bypass regulations. Moreover, the stress variations were carried out in four key areas including water chamber outlet, steam inlet pipe, the upper side of the tube sheet and the lower side of the tube sheet. The results show that as the bypass degree increases, the fluctuation range of thermal stresses, mechanical stresses and coupling stresses increases. The maximum thermal stress locates at the steam inlet pipe, the maximum mechanical stress locates at the lower side of tube sheet and the maximum coupling stress corresponds to the upper side of tube sheet. The upper side of tube sheet is the most dangerous part of the high-pressure heater, which needs to be paid attention to and repaired in advance.
标题：给水旁路调节下高压加热器的瞬态应力分析
title:Transient Stress Analysis of High Pressure Heater During Feedwater Bypass Regulations
作者：王建华,范佩佩,石峰,种道彤
authors:Jianhua WANG,Peipei FAN,Feng SHI,Daotong CHONG
关键词：超临界燃煤电站,高压加热器,应力分析,给水旁路,
keywords:supercritical coal-fired power plant,high pressure heater,stress analysis,feedwater bypass,
发表日期：2019-08-31
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