燃煤电站锅炉碳化硅质卫燃带表面结渣行为  

Slagging Behavior on Surface of Carborundum-based Refractory Liner in a Coal-fired Boiler

作　　者：何金桥[1] 鄢晓忠[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,中国长沙410076

出　　处：《动力工程学报》2011年第9期659-663,共5页Journal of Chinese Society of Power Engineering

基　　金：国家自然科学基金资助项目(50576005);湖南省教育厅重点基金资助项目(05A016)

摘　　要：采用扫描电镜、能谱分析仪和X射线衍射等方法对燃煤电站锅炉SiC质卫燃带上结渣的渣样进行了测试,并就渣样的形貌、结晶物相转化特性及其渣样成分分布进行了分析研究.结果表明:煤颗粒的不充分燃烧造成碱性金属阳离子向SiC耐火板侧发生扩散,但难以穿过耐火板表层的SiO2保护膜,从而与SiC质卫燃带通过机械结合的方式相互黏结在一起;方晶石和鳞石英易与耐火板发生熔融冶金结合,形成较强的黏结作用,但是耐火板处熔融的片状鳞石英和方晶石含量较少,因此渣、板之间总体的黏结作用较弱.In order to study the coal ash slagging behavior on surface of carborundum-based refractory liner in a coal-fired boiler, slag samples taking from the liner were investigated by Scanning Electron Microscopy （SEM）, Energy Dispersive Spectrometer （EDS） and X-ray diffraction（XRD）, during which the specific morphology, phase transformation and component distribution were analyzed. Results show that the in- complete combustion of pulverized coal makes alkaline metal ion diffuse to the refractory liner, which then sticks on the liner mechanically, because it is hard to permeate through the SiO2 protective film covering the liner. Metallurgical bonding lies between the cristobalite/tridymite and the liner, and the bonding be- tween plate-like tridymite and the liner is very strong. Since the content of plate-like tridymite in the slag is very little, so the comprehesive bonding force is relatively weak between the slag and the liner.

关 键 词：电站锅炉 碳化硅 卫燃带 结渣 机械结合 冶金结合 

分 类 号：TK227.2[动力工程及工程热物理—动力机械及工程]