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首页> 外文期刊>Engineering failure analysis >Failure analysis of a steam generator superheater drain tube used in a dump
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Failure analysis of a steam generator superheater drain tube used in a dump

机译：排污用蒸汽发生器过热器排水管的故障分析

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This paper analyses the failure of a superheater drain tube of a steam generator used in a dump to obtain energy from the biogas produced by organic waste. Chemical and micro-structure analyses, together with microhardness measurements, have been performed in order to check any possible deviation from the material specification, finding as the only deviation significant increases in hardness in the failure section, suggesting that the failure section is located in the heat affected zone of a nearby weld. Also, the failure mechanism has been analysed by both visual and SEM inspection of the fracture surface, identifying fatigue as the major cause of the final failure, assisted by corrosion processes. The different areas found on the fracture surface suggest that fatigue processes were caused by the maintenance operation consisting of hitting (hammering) the collector tube to which the drain tube is joined. No evidence has been found in relation to any other anomalous operating conditions, such as overpressure or unexpected high temperatures.
机译：本文分析了在垃圾场中使用的蒸汽发生器的过热器排放管从有机废物产生的沼气中获取能量的故障。为了检查与材料规格的任何可能偏差，已经进行了化学和微观结构分析以及显微硬度测量，发现唯一的偏差是破坏区域的硬度显着增加，这表明破坏区域位于材料的内部。附近焊缝的热影响区。同样，通过断裂表面的目测和SEM检查，分析了失效机理，并确定了疲劳是导致最终失效的主要原因，并辅以腐蚀过程。在断裂表面上发现的不同区域表明，疲劳过程是由维护操作引起的，维护操作包括击打（打磨）与排水管相连的集热管。没有发现与任何其他异常操作条件有关的证据，例如超压或意外的高温。

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