华电技术 ›› 2019, Vol. 41 ›› Issue (2): 26-27.

• 技术交流 • 上一篇    下一篇

超临界锅炉高温过热器爆管原因分析及对策

  

  1. 华电电力科学研究院有限公司,杭州〓310030
  • 出版日期:2019-02-25 发布日期:2019-03-13

Cause analysis and countermeasures for tube burst of hightemperature superheater in supercritical boiler

  1. Huadian Electric Power Research Institute Company Limited, Hangzhou 310030, China
  • Online:2019-02-25 Published:2019-03-13

摘要:

对仅运行12079h的某电站超临界锅炉T91钢高温过热器爆管进行试验分析,通过爆口宏观形貌分析、化学成分分析、显微组织观察、力学性能试验,认为T91钢高温过热器早期失效的原因是管子内存在异物堵塞,管子长期过热后加速老化,性能下降,最终导致爆管,分析堵塞原因并提出了相应对策。

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Abstract:

The supercritical boiler hightemperature superheater burst tube in T91 steel was tested and analyzed after 12079h operation. Through the macroscopic morphology analysis, chemical composition analysis, microstructure observation and mechanical property test, the early failure reason for super heater burst tube in T91 steel  is considered to be foreign matter clogged in the pipe.Longterm overheating accelerates the aging of pipe. The pipe’s performance degrades, which finally results in pipe burst.The cause of the blockage is analyzed and corresponding countermeasures are proposed.

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