350 MW超临界机组高温再热蒸汽管道下沉原因分析及治理  

Cause Analysis and Treatment of High Temperature Reheat Steam Pipe Sinking in 350 MW Supercritical Unit

作　　者：林庆宇 李勇军 黄庆华 李志刚 角加艺 沈雁逍 LIN Qingyu;LI Yongjun;HUANG Qinghua;LI Zhigang;JUE Jiayi;SHEN Yanxiao(Guangxi Special Equipment Inspection and Research Institute,Nanning 530200,China;Baise Baikuang Electric Power Co.Ltd.,Baise 533600,China)

机构地区：[1]广西壮族自治区特种设备检验研究院,广西南宁530200 [2]百色百矿发电有限公司,广西百色533600

出　　处：《锅炉技术》2024年第2期53-59,共7页Boiler Technology

基　　金：广西壮族自治区市场监督管理局科技计划项目(GXSJKJ2022-4)。

摘　　要：某350 MW超临界机组运行一段时间后,高温再热蒸汽管道锅炉侧支管存在大范围下沉现象,连续布置的恒力吊架指针大部分超出下极限位置。结合现场检查、测量,对管道进行多工况应力计算分析研究。结果表明:该机组循环流化床锅炉翼形墙结构高温再热器管屏变形,且变形量不均引起出口集箱端口处产生异常 X向角位移以及Z 向线位移是造成管道下沉的主要原因,恒力吊架荷载偏差度和恒定度超标是造成其下沉的次要原因。在不更换变形受热面管屏的前提下,充分利用管道柔性制定治理方案,改善管道及支吊架工作状态,优化管系应力水平。同时,对后期彻底解决管屏变形及管道下沉问题提出解决思路,可为同类机组管道的设计、维护和位移异常故障解决提供参考。After a period of operation, a large range of subsidence was found in the boiler side branches of high temperature reheat steam pipe of a 350 MW supercritical unit. Most pointers of continuously arranged constant spring hangers were beyond the lower limit position. Combined with field inspection and measurement, the stress calculation and analysis of pipeline under multiple working conditions were carried out. The results show that: The abnormal X-angular displacement and Z-linear displacement at the port of the outlet header are the main reasons for the pipe sinking, which are caused by the deformation and uneven deformation of the tube panel of the high temperature reheater with wing wall structure of the circulating fluidized bed boiler in this unit. The load deviation degree and constant degree of constant hangers exceed the limit is the secondary reasons for the pipeline subsidence. On the premise of not replacing the deformed heating surface tube panel, the working state of the pipeline and the support hangers are improved by making full use of pipeline flexibility to develop treatment scheme, and the stress level of the piping system is optimized. At the same time, the solutions to the problems of tube panel deformation and pipe subsidence in the later stage are put forward. The research provides reference for the design, maintenance and displacement anomaly troubleshooting of pipelines of similar units.

关 键 词：管道下沉 应力分析 循环流化床锅炉 翼形墙 变形 

分 类 号：TK223.1[动力工程及工程热物理—动力机械及工程]