粉煤灰综合利用 FLY ASH COMPREHENSIVE UTILIZATION 2010NO.1 流化床燃煤固硫灰渣膨胀控制因素研究* Study on Controlling Factors of Expansion of FBC Ashes 宋远明,徐惠忠,王美娥 (烟台大学环境与材料工程学院,烟台264005) 摘要:分别用线性膨胀率和XRD研究固硫灰清净浆试件的膨胀特性和固硫灰渣水化产物随龄期变化趋势,并在 结合二者试验结果的基础上对膨胀控制因素进行探讨.结果显示:固硫灰渣净浆试件的线性膨胀率在14~28d前增加 迅速,而后趋于平缓.试验表明,固硫灰清的膨胀特性可分为两个阶段:14~28d前主要受钙矾石量所控制,而随后龄期 则主要受二水石膏量所控制. 关键词:流化床;固硫灰清:线性膨胀率;控制因素 中图分类号:TU528.041;X773 文献标识码:A文章编号:1005-8249(2010)01-0003-03 (College of Environmental and Material Engineering Yantai University Yantai 264005 China) Abstract:Linear expansion ratio and X-ray diffraction(XRD)were used to study the expansion property and the change trend hy the age of hydration products of Fluidized Bed Combustion FBC)ashes paste respectively followed by the investigation of the controlling factors of expan- sion.The results show that the linear expansion mtio of FBC ashes paste increnses rapidly before 14-28 days and it tums steady later.This work confirms that the expansion property of FBC aahes can be divided into two phases:The linear expansion ratio of FBC ashes paste is controlled by the content of ettringite before 14 -28 days but by the content of gypsum subsequently. Key words:fluidized bed bustion:FBC ashes;linear expansion ratio:controlling factor 流化床燃煤固硫灰渣(以下简称固硫灰渣)是指解决以上问题,可帮助找到控制固硫灰渣膨胀的方法, 含硫煤与周硫剂(一般为石灰石)以一定比例混合后这将极大地推进其利用进程.由于固硫灰渣出现时间 在流化床锅炉内经850~900℃燃烧固硫后排出的固相对较晚,目前未见国内外对此问题的研究报道.为 体废弃物,其中从烟道收集到的灰状物为固硫灰,炉底此,本文在研究固硫灰渣净浆线性膨胀率的基础上,用 排出的块状物为固硫渣. X射线衍射(X-ray diffraction XRD)对固硫灰渣的膨 固硫灰渣除含有大量烧粘土...
流化床燃煤固硫灰渣膨胀控制因素研究.pdf
