废液焚烧余热锅炉灰渣沉积机理分析

研究了取自某炼化公司废液焚烧余热锅炉不同部位换热面的多个沉积样品，分析了不同部位换热面沉积生长物的组分与沉积机理。利用X射线衍射分析仪（XRD）、扫描式电子显微镜（SEM）以及能量弥散X射线探测器（EDX）分别来鉴定样品的结晶物成分、形貌以及元素组成，各个样品的灰熔融特征温度在智能灰熔点测试仪上测定。结果表明，余热锅炉高温入口段主要沉积物为Na2SO4、NiO、Fe2.3Si0.7O4等，炉膛中低温区域主要出现Na2Ni(SO4)2?4H2O、Na3Fe(SO4)3及 Na6Fe(SO4)4等物质沉积。这主要是由于硫酸钠与受热面管壁氧化保护层（Fe2O3）发生高温腐蚀引起的。

Analysis of formation mechanism of ash deposits in the waste liquid incineration heat recovery steam generator(HRSG)

The article studied on the ash deposits samples at different heat exchange locations in the waste liquid incineration HRSG of Refining & Chemical Company and analyzed the components of ash and depositional mechanism. Analytical techniques，such as rigaku X-ray Diffractometer system（XRD），Scanning Electron Microscope（SEM）and Energy Dispersive X-Ray Spectroscopy（EDX）had been applied to investigate elemental composition，morphology，and mineralogy，the characteristic temperature of ash fusion was tested by the Ash Fusion Determinator. The results showed that the main sediments in the high temperature entrance of HRSG were Na2SO4，NiO and Fe2.3Si0.7O4，the main sediments in the intermediate temperature entrance of HRSG were Na2Ni(SO4)2?4H2O，Na3Fe(SO4)3 and Na6Fe(SO4)4. This was mainly because sodium sulfate had the high temperature corrosion reaction with ferric oxide.