超超临界锅炉启停过程中汽水分离器温度场与应力场数值模拟计算
Numerical Simulation of Temperature and Stress Field of Steam-Water Separator during Ultra-supercritical Boiler Start-Stop
边浩 1刘双白 2胡娱欧 3吴昕 2韩亮 3崔福博 3刘银河1
作者信息
- 1. 西安交通大学能源与动力工程学院
- 2. 华北电力科学研究院有限责任公司
- 3. 国家电网公司华北分部
- 折叠
摘要
随着可再生能源行业的发展,更多火电机组需要参与调峰运行,这对锅炉的启停速度、运行的灵活性和安全稳定性提出了更高要求.汽水分离器是超超临界机组的核心厚壁承压部件,在启停过程中由于温度场的变化会产生热应力,从而引起应力损伤和疲劳损伤.通过有限元数值模拟对汽水分离器在不同启停过程中温度场与应力场进行了研究,获得了温度、热应力和总应力随时间变化的规律.研究结果表明,启停过程危险点位置始终处于筒身与引入管连接区域,不同启停过程中冷态启动应力幅值最大,为362 MPa.对冷态启动下3种加速方案进行仿真分析表明,不同方案启动结束阶段瞬态总应力无明显差异(365 MPa).
Abstract
With the development of renewable energy,more thermal power units participate in peak-regu-lating operation,which puts forward higher requirements for the boiler's starting and stopping speed,the flexibility of operation and the safety and stability.The thick-walled steam-water separator is the core pres-sure-bearing part of the ultra-supercritical unit.During the start-stop process,thermal stress can be gener-ated due to the change in the temperature field,which causes stress damage and fatigue damage.Through having finite element numerical simulation adopted to investigate temperature field and stress fields of a steam-water separator under different start-stop process,the variation of temperature,thermal stress and to-tal stress with time were obtained.The analysis results show that,the dangerous point in the start-stop pro-cess concentrates at the connection area between cylinder body and leading pipe,and the amplitude stress during cold starting process becomes the largest(362 MPa)in all calculated conditions.Simulating and an-alyzing three acceleration schemes under cold start shows that,no significant difference can be found in the total transient stress at the end of different start schemes(365 MPa).
关键词
超超临界锅炉/汽水分离器/热应力/快速启停/数值模拟Key words
ultra-supercritical boiler/steam-water separator/thermal stress/fast start-stop/numerical simulation引用本文复制引用
基金项目
国家电网有限公司科技项目(SGNC0000TJJS2100069)
出版年
2024
NETL
NSTL
维普
万方数据