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요약정보
350MW超临界锅炉水冷壁管爆管原因分析 / Cause analysis on water-wall tubes bursting of 350 MW super-critical boiler
Resource Type
Academic Journal
Authors
杨伟东
;
李亮
;
杨浩
;
包艳蓉
;
马利立
;
YANG Weidong
;
LI Liang
;
YANG Hao
;
BAO Yanrong
;
MA Lili
Source
宁夏电力 / Ningxia Electric Power
. (6):65-70
Subject
水冷壁管
焊接
未熔合
疲劳
断口分析
Language
Chinese
ISSN
1672-3643
Online Access
Find it @ DONGA
초록
利用宏观检查、金相组织分析、力学性能检测、化学成分分析以及断口扫描电镜分析等对失效管段进行了全面检测,分析某超临界锅炉水冷壁管的爆管原因.结果表明:安装人员将原设计的柔性连接改为刚性焊接连接,同时,施工质量较差,连接焊缝中存在未熔合缺陷导致严重的应力集中;顶棚过热器管与水冷壁管膨胀量及膨胀方向不一致,且反复变化,使水冷壁管与加强筋的搭接焊缝在锅炉运行过程中长期承受疲劳载荷,是导致本次水冷壁管开裂的直接原因.
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