摘要
将2种不同碱酸比的煤灰均匀敷设在刚玉质耐火材料上,并将其置于高温马弗炉中在1 350℃空气气氛下煅烧40h,煅烧完成后采用扫描电子显微镜(SEM)、能谱分析(EDS)、X射线衍射(XRD)等方法对刚玉质耐火材料板上2种结渣倾向对比明显的灰渣形貌和成分进行分析,得到了灰渣的高温烧结特性.结果表明:碱金属含量较高的煤灰黏度较小,流动性较强,对刚玉质耐火材料板的侵蚀较严重;熔融灰渣向刚玉质耐火材料内部渗透侵蚀,各元素原子百分数沿材料板深度方向大致呈下降趋势;在刚玉质耐火材料中加入的少量Cr2O3在高温下会渗透到煤灰中,并生成高熔点、高黏度的铝氧化铬,从而减轻了煤灰对刚玉质耐火材料的侵蚀.
Slagging characteristics of two kinds of coal ash with different alkali/acid ratios were studied on corundum-based refractory liner in Muffle furnace in air at I 350 ℃ for 40 h, after which the slag morphol ogy and composition were analyzed by scanning electron microscopy （SEM）, energy dispersive spectrome ter （EDS） and X-ray diffraction （XRD）. Results show that the coal ash with higher alkali metal content has lower viscosity, stronger liquidity and therefore may severely erode the refractory liner; elements in melting ash infiltrate into the liner, distributing in a reducing atomic percentage along the liner depth; the little Cr2O3 contained in refractory liner may penetrate into coal ash and subsequently form there （Al0.9Cr0.1）2O3 with high melting point and high viscosity, which helps to prevent the liner from erosion by coal ash.
出处
《动力工程学报》
CAS
CSCD
北大核心
2013年第4期256-260,共5页
Journal of Chinese Society of Power Engineering
关键词
刚玉质耐火材料
煤灰
结渣特性
碱金属
SEM
EDS
XRD
corundum-based refractory material~ coal ash~ slagging characteristic
alkali metal
SEMEDS ~ XRD
