中文摘要：

本文在一维沉降炉实验系统中进行准东煤燃烧实验,在沉降炉底部不同烟气温度处采用沉积取样探针收集灰样,采用低压撞击器（DLPI）与水冷稀释取样探针收集微细颗粒物,并采用扫描电镜（SEM）与X射线能谱仪（EDS）对灰样及细颗粒物进行分析获得准东煤燃烧过程中灰沉积特性与微细颗粒物形成机理,进而得到Na、Ca及S的迁移规律及其在结渣过程中所起作用。结果表明,准东煤中Na、Ca一共分为两类,一部分Na、Ca与硅铝结合形成硅铝酸盐,在燃烧过程中不可气化;剩余含Na、Ca化合物释放到烟气中并与S结合形成气相Na2SO4与CaSO4。随着烟气温度降低,Na、Ca的硫酸盐一部分在灰颗粒表面凝结,一部分形成气溶胶颗粒直接释放到大气中或发生团聚黏附在灰颗粒表面。

英文摘要：

In this paper, the Zhundoug coal combustion experiments were carried out in a drop tube furnace, and the ash was collected at the buttom of reacter by a non-cooled probe. The fine particles were also collected from the gas by sampling device which composed of dekati low pressure impactor and a water-cooled probe with N2 dilution. The ashes and fine particles was analyzed by SEM and EDS to obtain the ash deposition and fine particles formation characteristic. Furthermore, the transformation and the effect on slagging of Na, Ca and S were studied. The results indicated that the Na and Ca can be divided into two types. A part of Na and Ca which bounded with Si and A1, would not vaporize during combustion; on the contrary, the others will release into gas and then react with S to form gaseous Na2SO4 and CaSO4. These gaseous sodium and calcium sulfates can be separate into two portion. The first part condensated on the ash particle surface, the remainders form to aerosol which agglomerated with each other and then adhere on ash particles or discharge from stack.