摘要
对国内某铝厂原料石油焦和煅烧后的石油焦进行了X射线荧光(XRF)分析,并通过省煤器样管的扫描电镜(SEM)分析及腐蚀层的X射线衍射(XRD)检测,讨论了余热锅炉省煤器管壁低温腐蚀的形成及其机理.结果表明:省煤器管壁腐蚀层物质的主要成分是FeSO4.H2O;炼焦产生的高浓度SO2以及天然气燃烧所产生的大量水蒸气是造成铝厂余热锅炉低温腐蚀的原因,可以通过提高省煤器管壁温度来防止低温腐蚀的发生.
X-ray fluorescence（XRF） analysis was performed for the raw petroleum coke and the incinerated petroleum coke of certain aluminum plant in China.By analyzing the scanning electron microscope（SEM） of the sample tube made from the economizer and X-ray diffraction（XRD） of the corrosion layer,the formation and mechanism of low temperature corrosion on the wall of the economizer of the waste heat boiler were discussed.Results show that the main component of the corrosion layer was FeSO_4·H_2O,and the low temperature corrosion of waste heat boiler in aluminum plant was caused by higher concentration of SO_2 produced by coking and large amounts of steam produced by natural gas combustion.Low temperature corrosion can be prevented by increasing the wall temperature of the economizer.
出处
《动力工程学报》
CAS
CSCD
北大核心
2010年第7期508-511,共4页
Journal of Chinese Society of Power Engineering
基金
国家自然基金资助项目(50976086)
关键词
余热锅炉
省煤器
低温腐蚀
石油焦
机理
waste heat boiler
economizer
low temperature corrosion
petroleum coke
mechanism
