期刊论文

Effect of different water conditions upon formation and exfoliation of oxide scale of TP347 superheator tube

中文

长沙理工大学学报(自然科学版)

1672-9331

2016

13

2

86-93

10.3969/j.issn.1672-9331.2016.02.015

湖南省自然科学基金资助项目（09JJ6067）； 湖南省科技攻关项目（2010GK3171）；

本校为第一机构

火电厂超临界机组末级过热器TP347不锈钢管氧化皮的生长与脱落问题是困扰全厂安全与经济运行的难题.采用SEM,EDS和XRD等手段,分析了现场实际运行5000~50000 h的末级过热器TP347管的腐蚀形貌与特征,比较研究了3种水化学工况(还原性全挥发处理工况AVT(R)、氧化性全挥发处理工况AVT(O)、加氧水工况(OT)下不同运行时氧化皮特征.研究结果表明,在相同的氧化时间下,氧化皮厚度的大小依次为:AVT(O)工况>AVT(R)工况>OT工况,OT工况中氧化皮剥落现象最为严重,AVT(O)工况中氧化皮最不易剥落.XRD分析表明,材料表面形成了微米级腐蚀产物膜层,其氧化皮为双层结构,内层为铁铬尖晶石结构FeCr2O4,外层为Fe3O4和Fe2...

Scale formation and exfoliation of TP347 superheator tube confuses the plant safe- ty and economic operation severely. The method of SEM, EDS and XRD was used to ana- lyze the corrosion morphology and characteristics of final stage superheator tube TP347 actually running 5 000 h to 50 000 h. In addition, the scale features under three different conditions,namely, the Oxygenated Treatment （ OT）. All Volatile Treatment （Reduction） （AVT（R）） and All Volatile Treatment （Oxidizing）（AVT（O）） was compared and studied in different run time ...