摘要
使用扫描电镜、能谱、粉末X射线衍射等测试手段,分别对循环流化床(CFB)垃圾焚烧炉尾部烟道沿烟气流程不同受热面的烧结积灰进行了微观结构、元素和物相组成的分析对比,对Ca-S型烧结积灰的机理进行了讨论。结果表明,CFB垃圾焚烧炉受热面烧结积灰主要由亚微颗粒熔融团聚而成,烟气温度越高烧结积灰结构越致密。形成烧结积灰的主要元素是Ca、S等,600℃左右对流受热面积灰中Ca、S的富集达到最大。松散积灰中Si、Al是主要的成分,Ca、S也仍保持较高的水平。烧结积灰的物相组成主要是CaSO4,还有少量低熔点的钙的硅酸盐,化学反应烧结和传质作用的强化是积灰固化的重要原因。
The microstructure of elemental components and phasic constitution of sintered ash deposits on heat delivery surfaces along the rear flue way of circulating fluidized bed （CFB） incinerators were analyzed and compared with another with the help of a scanning electron microscope （SEM）, and using energy dispersive X-ray analysis （EDX） as well as X- ray powder diffraction analysis （XRD）. The sintering mechanism of Ca-S type deposits is being discussed. Study results indicate that sintered ash deposits on heat delivery surfaces of CFB incinerators are mainly built up of conglomerated submicro particles; and the higher the flue gas temperature the more compact the sintered deposits become. Elements such as Ca and S are the main constituent appearing most abundantly on convection heating surface with a temperature of about 600~C, Si and A1 are the main constituents of loose ash deposits, which though are still rich in Ca and S. The main mineral contained in the sintered ash is CaSO4 with a small percentage of calcium silicates of low melting point. Chemical reactions coupled with sintering and intensified mass transfer are the main factors that cause the solidification of ash deposits. Figs 3, table 1 and refs 13.
出处
《动力工程》
EI
CSCD
北大核心
2006年第4期550-553,共4页
Power Engineering
关键词
工程热物理
循环流化床
垃圾焚烧炉
烧结积灰
微观分析
CASO4
engineering thermophysics
circulating fluidized bed
waste incinerator
sintered ash deposit
microanalysis
CaSO4
