摘要
为了分析石油焦煅烧炉用硅砖的损毁机制,借助X射线衍射仪、场发射电子扫描隧道显微镜(SEM)及能谱分析仪(EDS)等设备分析了石油焦煅烧炉用后硅砖及在模拟环境下经石油焦侵蚀后硅砖的物相组成,观察了其微观结构变化,并结合热力学分析探讨了硅砖的损毁机制。结果表明:随着温度的升高,硅砖中的Si O2组分在还原性气氛下更容易形成Si O等气相物质并逸出,从而导致硅砖内部形成孔洞,破坏了硅砖的结构稳定性。石油焦煅烧炉用硅砖的损毁主要与使用温度偏高,Si O2组分持续被还原以及出现更多液相有关。
The phase composition and microstructures of used silica bricks from a petroleum coke calcinator and silica bricks corroded in a simulated petroleum coke environment were investigated by means of X-ray diffraction (XRD),and field emission scanning electron microscopy (SEM)equipped with energy disper-sive spectrometer (EDS)associated with thermodynamic calculations to study the damage mechanism of silica bricks in petroleum coke calcinators.The results show that with the rising temperature,SiO2 in the bricks is easy to decompose in reduction atmosphere releasing SiO gas and resulting in the large pores in the silica bricks,which damages the structure of silica bricks.The main degradation of such refractories is mainly related to the high service temperature,the continuous reduction of SiO2 and more liquid phase formed.
出处
《耐火材料》
CAS
北大核心
2016年第2期104-108,共5页
Refractories
基金
国家自然科学基金资助项目(51202168)
湖北省自然科学基金资助项目(2010CDB03401)
关键词
硅砖
石油焦煅烧炉
侵蚀机制
silica bricks
petroleum coke calcinator
corrosion mechanism
