超超临界机组高温再热器出口管道线状偏离分析  

Analysis on Linear Deviation of the Outlet Pipeline of High Temperature Reheater in an Ultra-supercritical Unit

作　　者：张郑磊[1] 吴海洋 黄小波 张旭升 孙中元[1] Zhang Zhenglei;Wu Haiyang;Huang Xiaobo;Zhang Xusheng;Sun Zhongyuan(Suzhou Nuclear Power Research Institute Co.,Ltd.,Suzhou 215004,Jiangsu Province,China;Guoneng Ningdong No.1 Power Generation Co,Ltd,Yinchuan 750408,China)

机构地区：[1]苏州热工研究院有限公司,江苏苏州215009 [2]国能宁东第一发电有限公司,银川750908

出　　处：《发电设备》2023年第1期24-30,共7页Power Equipment

摘　　要：某660 MW机组超超临界机组高温再热器出口管道发生线状偏离,部分恒力弹簧支吊架已处于极限位置。分析管道线状偏离的原因,并且结合位移-荷载测试,通过模拟对运行状态下管道的应力分布进行研究。结果表明:大量恒力弹簧支吊架荷载偏差度及恒定度显著超标,管道冷态位移与现场实测偏离值相吻合;模拟得到运行状态下的管道一次应力、二次应力普遍增加,并且部分节点的二次应力超过允许值。管道弹簧支吊架荷载性能不达标,造成管道自重与支吊架承载能力不匹配,是管道发生线状偏离的主要原因,建议对不合格支吊架进行更换,同时加强管道支吊系统的日常监督管理。The linear deviation occurred in the outlet pipeline of the high temperature reheater in a 660 MW ultra-supercritical unit, and many constant spring supports were at the lowest position. Analyses were conducted on the liner deviation, and combined with the displacement-load test, the stress distribution of the pipeline during operation was researched through simulation. Results show that the load deviation and constant degree of most of constant spring supports has significantly risen above the standard value, and the displacement in cold operation is in accordance with the tested deviation value on site. Both of the primary stress and the secondary stress during operation obtained from simulation have an increase on average, while the secondary stress of some nodes even exceeds the allowable value. The main reason of the pipeline linear deviation is the substandard performance of the constant spring support, which is caused by a mismatch between the gravity load of the pipeline and the applied load of the constant spring support. It is suggested that the unqualified support must be replaced, and the daily maintenance of support should be strengthened in the management and supervision.

关 键 词：超超临界机组 高温再热器 管道 线状偏离 恒力弹簧支吊架 位移-荷载测试 应力分布 

分 类 号：TM621.[电气工程—电力系统及自动化]