Failure Analysis of Boiler Water Wall of a 350 MW Coal-Fired Power Unit
In this paper,the reasons for the leakage of boiler water wall of a coal-fired power unit are ana-lyzed by means of macroscopic examination,microstructure analysis and hardness test.The results show that the failure is caused by the non-standard welding process,resulting in the overheated structure and the most concentrated stress in the area.Affected by the boiler start-up and shutdown and the sharp increase and decrease of load,the microcracks are rapidly initiated and expanded and ultimately leads to the tube burst.Finally,corresponding countermeasures and suggestions are provided.
water wallwelding processoverheated structurefailure
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