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Failure Analysis of the Corroded Water Wall Tube in a 50MW Thermal Power Plant

机译：50MW火力发电厂腐蚀的水冷壁管的失效分析。

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摘要

High temperature corrosion of the water wall tube in a 50 MW thermal power plant was investigated which caused several boiler accidents. X-ray diffraction (XRD) and scanning electron microscopy (SEM) equipped with energy dispersive spectrometer (EDS) were used to observe the cross-sectional morphology of the tube and analyze the oxide scales. Results show that the boiler water and the coal quality did not meet the requirements. High temperature corrosion of water wall tubes was attributed to the using of coal which had a higher ash content and lower received lower heating value. Higher dissolved oxygen and incrustation in the boiler water caused serious corrosion at the inner surface of water wall tube, which led to the possibility of decarburization and degradation of the steel. Suitable coal blending and stability of the thermal load were the effective means to prevent the high temperature corrosion of the tube.
机译：研究了50 MW火力发电厂水冷壁管的高温腐蚀，这引起了数起锅炉事故。 X射线衍射（XRD）和配备能量色散谱仪（EDS）的扫描电子显微镜（SEM）被用来观察管子的横截面形态并分析氧化皮。结果表明，锅炉水和煤质均不符合要求。水冷壁管的高温腐蚀归因于煤的使用，该煤具有较高的灰分含量和较低的受热值。较高的溶解氧和锅炉水中的结垢在水冷壁管的内表面引起严重的腐蚀，从而导致钢脱碳和降解的可能性。适当的配煤和热负荷的稳定性是防止管子高温腐蚀的有效手段。

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