华电技术 ›› 2016, Vol. 38 ›› Issue (1): 64-67.

• 节能与环保 • 上一篇    下一篇

脱硝装置入口烟道非金属膨胀节故障原因分析与设计优化

  

  1. 1.神华国华(北京)电力研究院有限公司,北京〓100025;2.神华广东国华粤电台山发电有限公司,广东台山〓529228
  • 出版日期:2016-01-25 发布日期:2016-03-15

Failure analysis and design optimization of non metallic expansion joint at inlet duct of denitrification device

  1. 1.Shenghua Guohua(Beijing)Electric Power Research Institute Company Limited,Beijing 100025,China;2.Shenhua Guangdong GuohuaYuedian Taishan Power Generation Company Limited,Taishan 529228,China
  • Online:2016-01-25 Published:2016-03-15

摘要:

摘要:某电厂1000MW机组脱硝装置入口烟道非金属膨胀节存在下部蒙皮开裂、法兰严重变形等故障,通过分析,确定故障原因为原膨胀节采用的双波型中间法兰铰链结构设计不合理。将膨胀节更换为单波结构的非金属膨胀节,并对膨胀节框架、隔热层、蒙皮等结构进行了优化。两年多的运行表明,全负荷工况下膨胀节膨胀良好,表面温度不超过50℃。

关键词: 关键词:脱硝装置, 入口烟道, 非金属膨胀节, 蒙皮, 法兰, 隔热层

Abstract:

Abstract:Some faults are existed in the non metallic expansion joint at inlet duct of denitrification device for a certain 1000MW power unit,such as the lower skin cracking and serious deformation of flange etc.Through the analysis,the failure reason is considered as the unreasonable structure design of double wave type middle flange hinge of expansion joint.In this paper,the original expansion joint was replaced by single wave structural non metallic expansion joint,and some structural optimizations of expansion joint frame,thermal protective coating and skin were also conducted.More than two years of operation shows that the expansion joint works well and the surface temperature is less than 50℃ under full load condition.

Key words: Keywords:denitrification device, inlet duct, non metallic expansion joint, skin, flange, thermal protective coating