Comprehensive settlement control and stress optimization analysis of pipe system in power plant

电站管道系统沉降综合治理及应力优化分析 Comprehensive settlement control and stress optimization analysis of pipe system in power plant 刘欣 LIU Xin 1 first-author 张燕明 ZHANG Yanming 1 刘群 LIU Qun 1 侯兴隆 HOU Xinglong 1 董雪峰 DONG Xuefeng 2 孙旭 SUN Xu 1 贾俊祥 JIA Junxiang 2 赵立业 ZHAO Liye 3 大唐东北电力试验研究院有限公司 大唐东北电力试验研究院有限公司 Liaoning Datang Huludao Thermal Power Co.,Ltd. Liaoning Datang Huludao Thermal Power Co.,Ltd. 辽宁大唐国际葫芦岛热电有限责任公司  辽宁大唐国际葫芦岛热电有限责任公司  Datang Northeast Electric Power Test & Research Institute Datang Northeast Electric Power Test & Research Institute 中国电力工程顾问集团东北电力设计院有限公司 中国电力工程顾问集团东北电力设计院有限公司 Northeast Electric Power Design Institute Co.,Ltd.,China Power Engineering Consulting Group Northeast Electric Power Design Institute Co.,Ltd.,China Power Engineering Consulting Group 某300 MW电厂主蒸汽管道以及再热蒸汽管道炉顶管段发生位移异常情况,结合现场管道焊缝无损检测和吊架指示状态,对管段位移异常进行治理并优化管道及焊缝的结构应力。采用有限元分析方法与管道载荷性能测试、标高测量等综合性测量技术相结合的方式,并辅以焊缝无损检测手段。结果表明,管系一次应力、二次应力水平均降幅超过15%,同时开裂位置焊缝应力集中的情况减少。通过本次管段沉降治理以及结构应力优化,建议新投产机组在两年内掌握管系应力水平以及位移偏离状态,并结合管道综合测量技术以及支吊架调整技术,开展管系结构优化系统性治理,延长管道使用寿命的同时实现机组的安全稳定运行。 In the case of abnormal displacement of the main steam pipeline and the furnace top pipe section of reheat steam pipeline in a certain power plant,the abnormal displacement of the pipe section was treated and the structural stress of the pipe and weld was optimized based on the non-destructive test of the weld on site and the indication state of the hanger.Finite element analysis method,pipe load perfor-mance test,elevation measurement and other comprehensive measurement techniques are combined to assist the non-destructive test methods of welds. The primary stress and secondary stress of the pipe system reduce by more than 15%,and the stress concentration of the weld at the cracking position also reduces.Through this pipe section settlement management and optimization of structural stress,it is suggested that a new production unit should master the stress level and displacement deviation status of pipe system as soon as possible within two years.Combining with the comprehensive pipeline measurement technology and the supports and hangers adjustment technology,the pipeline structure optimization and systematic treatment are carried out to prolong the service life of the pipeline and realize the safe and stable operation of the unit. 位移异常 结构应力 支吊架调整 使用寿命 abnormal displacement structural stress support and hanger adjustment service life TM621 2022-03-08 7 51