煤粉物化特性对燃烧后灰颗粒物的影响

Influence of coal physicochemical properties on ash particulate matter after coal combustion

以三种煤粉在沉降炉中做燃烧实验,用Andersen粒子撞击器分离并捕集燃烧后的灰颗粒物,借助于压汞仪、扫描电镜及能谱、ICP-AES等对煤粉及分级颗粒物进行检测,研究煤粉物化特性对灰颗粒物的粒径分布、形貌、组成、痕量元素的富集等特性的影响。结果表明,煤粉孔结构、组分的赋存方式及含量等影响其破碎行为及组分迁移、转化的过程,从而形成形态、大小不同的颗粒物,呈现出不同的粒径分布特性,同时影响元素的蒸发和凝结及其在分级颗粒物中的再分配过程。

Three coals were combusted in a drop tube furnace.An Andersen particle sizing impactor was employed to separate and collect the ash particulate matter（PM） after coal combustion.Mercury injection apparatus,SEM-EDX,ICP-AES were taken to detect the tested coals and graded ash PM.The effect of coal physicochemical properties on ash particle size distribution（PSD）,appearance,constituents and enrichment of trace elements of PM was examined.The results show that the pore structure of coals,occurrence characteristics and concentration of constituents influence the behavior of ash fragmentation and the transition procedure of constituents,forming different morphological and inequable PM,and leading to the different PSD.Simultaneously,they will influence the vaporization and coagulation of elements as well as the redistribution in the graded PM.