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

作　　者：边浩 刘双白[2] 胡娱欧 吴昕 韩亮 崔福博 刘银河[1] BIAN Hao;LIU Shuang-bai;HU Yu-ou;WU Xin;HAN Liang;CUI Fu-bo;LIU Yin-he(School of Energy and Power Engineering,Xi'an Jiaotong University;North China Electric Power Research Institute Co.,Ltd.;StateGrid North China Branch Corporation)

机构地区：[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

出　　处：《化工机械》2024年第1期62-70,105,共10页Chemical Engineering & Machinery

基　　金：国家电网有限公司科技项目(批准号:SGNC0000TJJS2100069)资助的课题。

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)。With the development of renewable energy,more thermal power units participate 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 pressure-bearing part of the ultra-supercritical unit.During the start-stop process,thermal stress can be generated 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 total stress with time were obtained.The analysis results show that,the dangerous point in the start-stop process 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 analyzing 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 

分 类 号：TQ054[化学工程]