共查询到20条相似文献,搜索用时 140 毫秒
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某厂 4号锅炉运行 2 0 5 32h后 ,发现水冷管发生比较严重的腐蚀 ,采用化学、金相、电镜等手段对腐蚀产生的原因进行了分析。结果表明 ,该腐蚀是Cl离子参与的孔蚀 ,表面机械划伤及腐蚀痕迹是管壁严重孔蚀的重要原因。 相似文献
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通过宏观检查、金相检测、力学性能试验、扫描电镜和能谱分析,对超临界机组高温再热器管热腐蚀原因进行分析.结果表明,由于煤质不佳,导致高温再热器管壁发生热腐蚀,造成泄漏发生. 相似文献
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通过电子探讨,能谱和X射衍射等多种分析技术系统分析某电厂锅炉水冷壁管发生局部腐蚀的原因。结果表明,腐蚀产物中硫含量很高,局部区域超过20(wt%),产物主要由铁的氧化物和硫化物组成。水冷壁管受热面腐蚀主要原因是高温硫腐蚀。 相似文献
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某电站锅炉水冷壁发生爆管泄漏,通过水冷壁厚度、材质、金相分析及腐蚀产物成分分析,确定水冷壁失效的直接原因是锅炉水质不合格导致的严重腐蚀。根据事故原因提出了具体的应对措施。 相似文献
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Yuuzou Kawahara 《Journal of Thermal Spray Technology》2007,16(2):202-213
Corrosion-resistant materials (CRMs) and coatings are key technologies to increase power generation efficiency and reduce
maintenance in waste-to-energy (WTE) plants. Corrosion environment became severe as steam temperatures have increased. The
steam condition of more than 400 °C/3.9 MPa became possible in WTE boilers by using highly durable corrosion-resistant coatings,
such as thermal spray of Al/80Ni20Cr alloy, HVOF-sprayed NiCrSiB alloy, Alloy 625 weld overlay for waterwall tubes and also
superheater tubes. Also, the use of 310S type stainless steels and high Cr-high Mo-Ni base and high Si-Cr-Ni-Fe alloys have
progressed because of a better understanding of corrosion mechanisms. Furthermore, high durability coatings using cermet and
ceramic materials were applied to high temperature superheaters. This paper describes the major developments and the application
of CRMs and coating technologies in the last 30 years in WTE plants, the corrosion mechanisms of alloys, the deterioration
mechanisms of spray coating layers, and future subjects for the development of corrosion-resistant materials and coatings. 相似文献
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In 1990 the electricity in the Netherlands will be generated for more than 50% with coal as fuel. Fireside corrosion causes a minor, but from an economic point of view not negligible, contribution to unforseen plant unavailability. Measures are taken concerning materials, additives and coal blending. Around 1980 heavy oil had an essential (40%) part in the power generation: experiences with corrosion and additives from that period are summarized. Research has been carried out with new coextruded materials under severe corrosion conditions in order to improve the overall unit efficiency. Creep tests at elevated temperatures have been performed in connection to this. Furthermore research is going on concerning the effects of low NOx burning techniques (on the corrosion behaviour of waterwall tubes) and in the field of IGCC-plants. 相似文献
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蒸汽锅炉炉管爆裂失效分析 总被引:1,自引:0,他引:1
对某烯烃厂爆裂破坏的蒸汽锅炉(F106)炉管,进行了宏观形貌、化学、金相、扫描电镜的分析.结果表明:炉管爆裂的原因是由于炉内爆管处局部温度过高(超温),并在该温度下长期运行,管壁发生了高温蠕变,晶界出现蠕变裂纹,使得炉管强度降低所致. 相似文献