锅炉碳化硅质卫燃带上灰渣扩散行为  

Diffusion Behavior during Coal Ash Slagging on the SiC-based Refractory Liner in Utility Boiler

作　　者：何金桥[1] 陈冬林[1] 

机构地区：[1]长沙理工大学能源与动力工程学院,长沙410004

出　　处：《机械工程学报》2012年第16期110-115,共6页Journal of Mechanical Engineering

基　　金：国家自然科学基金资助项目(50576005)

摘　　要：采用扫描电镜、能谱分析仪、X射线衍射等方法对燃煤电站锅炉SiC质卫燃带上结渣渣样进行了测试,并就紧贴卫燃带渣样断面的物相转化及结渣方向的扩散特性进行分析研究。结果表明,灰渣结晶度变化主要取决于钙长石、铁尖晶石和SiO2的物相与晶相的转化,而且越靠近SiC质卫燃带表面,灰渣成分细化越显著。灰渣中的碱性离子成分在紧贴SiC质耐火板的渣样中扩散均匀,并沿结渣断面方向的扩散逐渐趋于热力学稳定状态,有效避免Si质量分数高的煤灰对SiC质卫燃带侵蚀结渣作用。In order to research the coal ash ingredients diffusion on slagging influence on the SiC-based liner in utility boiler, the slag sample on the SiC-based refractory liner producing during the operation process of utility boiler is investigated by scanning electron microscopy（SEM）, energy dispersive spectrometer （EDS）, X-ray diffraction（XRD）, and the slagging samples＇ properties of phase transformation on, and component distribution along the slagging transverse direction are studied. The results show that the erystallinity of ash slag mainly depends on the phase transformation of materiat and crystallization of anorthite, hercynite and SiO2, especially the closer the SiC-based liner surface, the smaller the ash crystalling phase becomes. The alkaline ionic components of ash slag in clingy SiC-based fireproof board spread evenly, and along the slagging direction this diffusion tends gradually thermodynamic steady state, which effectively avoid the rerosion and slagging of molten coal ash of high Si content to SiC-based liner.

关 键 词：电站锅炉 扩散行为 卫燃带 结渣 SIC 

分 类 号：TK229[动力工程及工程热物理—动力机械及工程] TK227