用于燃气发电机组热交换管十八胺不降温停炉保养的可行性研究  

Feasibility of Application of Octadecylamine for Shutdown Protection of Heat Exchange Pipes Without Cooling in Gas Fired Generating Units

作　　者：胡家元[1] 曹顺安[1] 谢建丽[2] 

机构地区：[1]武汉大学动力与机械学院,武汉430072 [2]武汉大学化学与分子科学学院,武汉430072

出　　处：《腐蚀科学与防护技术》2012年第2期158-162,共5页Corrosion Science and Protection Technology

基　　金：中央高校基本科研业务费专项(20102080101000090)资助

摘　　要：采用GCF型高压釜模拟350～560℃的高温水汽环境,研究了十八胺(ODA)分解特性和燃气机组高温管材T22及P91的ODA成膜特性.结果表明,ODA在高温下存在分解平衡,且产物无危害;ODA在350～560℃温度范围内均能在金属表面形成性能良好的保护膜,480℃时的成膜效果最佳;560℃时经ODA成膜后金属表面膜的保护性较自身氧化膜保护性提高数倍,证明不降温加ODA停炉保养是可行的.建议的最优工艺条件为:温度560℃、ODA浓度80 mg/L、pH为9.5及恒温时间2 h.膜层X射线光电子能谱分析表明,表面膜为含ODA的氧化铁层,ODA中N与Fe发生化学吸附形成保护膜.By using a simulating of water-steam system at 350～560℃,the decomposition of octadecylamine was investigated,and the ODA film formation characteristics were studied for the T22 and P91 heat exchange pipes used in gas fired generating units.It was shown that Octade-cylamine had a decomposing equilibrium at high temperature and the decomposition products didn＇t include harmful organic substances such as low molecular organic acids.Octadecylamine promoted formation on the steels of a good protective film in the range of 350～560℃with the best film at 480℃.The protection property of the film formed with ODA at 560℃was much better than that without ODA,which suggested the probability of application of octadecylamine for shutdown protection of heat exchange pipes without cooling in gas fired generating units.The optimal conditions were as follow：560℃,80 mg/L ODA,pH 9.5 and 2 h.The surface film was supposed to be a compound of ferroferric oxide and octadecylamine through analysis of X-ray photoelectron spectroscopy.

关 键 词：燃气机组 不降温 十八胺(ODA) 停炉保养 

分 类 号：TG174[金属学及工艺—金属表面处理]