超临界机组水冷壁泄漏原因分析  

Cause Analysis of Water-wall Leakage in Super-critical Units

作　　者：彭碧草[1,2] 刘云龙[1,2] 沈丁杰[1,2] 唐远富[1,2] 

机构地区：[1]湖南省湘电锅炉压力容器检验中心有限公司,湖南长沙410004 [2]国网湖南省电力公司电力科学研究院,湖南长沙410007

出　　处：《锅炉技术》2015年第A02期57-60,共4页Boiler Technology

摘　　要：针对某电厂超临界机组水冷壁泄漏原因进行分析，发现预埋填板部位管段结构设计不合理，使该部位水冷壁管子在运行时特别是机组启停时存在较大的径向温差应力疲劳作用，是造成该部位水冷壁管段内壁萌生裂纹并扩展致泄漏的主要原因。Reasons for the leakage of water wall of one supercritical unit are analyzed. The results show that, the unreasonable structural design of pre-buried filler plate part of pipe section make the parts of water wall tubes bears the big radial stress fatigue effect when exist radial temperature difference during operating especially at the unit start and stop. Which is the main cause of the initiation and propagation of mico-cracks at inner wall of water wail tube, finally results in the leakage.

关 键 词：水冷壁 裂纹 疲劳 泄漏 

分 类 号：TK223.31[动力工程及工程热物理—动力机械及工程]