中文摘要：

通过对两种烟煤在沉降炉内的燃烧试验，研究了不同氧气量对可吸入颗粒物的生成量、元素成分及形成机理的影响。试验条件为：煤粉粒径包括小于63μm和63～100μm两种，燃烧温度在1250℃，炉内燃烧气氛包括氧含量20％和50％两种。试验采用低压撞击器（LPI）按不同粒径大小从0．03—10μm共分为13级，分别采集燃烧后的可吸入颗粒物。试验结果显示：两种粒径煤粉燃烧后超微米颗粒物（PM1-10）排放量都随氧含量增加而显著增加，小粒径煤粉的增加更多；在亚微米颗粒物（PM1）中，其主要构成元素S随氧含量增加而显著减小，元素Fe、Si和Al随氧含量增加而显著增加，其中Si元素增加幅度最大；而在超微米颗粒（PM1-10）中，元素S随氧含量增加而少量减小，其主要构成元素Fe、Si和Al随氧含量增加而少量增加；相比较而言，氧含量变化对亚微米颗粒物的元素构成影响比超微米颗粒物大。

英文摘要：

Combustion of two kinds of pulverized coal was studied in a drop tube furnace to understand the emission, elemental composition and formation mechanism of inhalable particulate matter（PM） at different oxygen. Experimental conditions were selected as following： two coals were divided into two sizes, small than 63 μm and 63-100μm, reaction temperature was 1250℃, oxygen content was 20% and 50% respectively. PM was collected with a 13 stages Low-Pressure-Impactor（LPI） having aerodynamic cut-off diameter ranging from 10.0 to 0.03μm for a size-segregated collection. The Experimental results indicated that, oxygen content affected PM emission and elemental composition significantly in the combustion. Between the two coal particle sizes, increasing oxygen content leaded to much increase of emitted PM, what＇s more, fine particle sizes increased more. In the submicron particulate matter （PM1）, elemental sulfur was greatly decreased with the increase of oxygen content, in contrast, elemental iron, silicon and aluminum were greatly increased with oxygen content, between the three of them, the extent of elemental silicon increased was most. In the coarse particulate matter（PM1-10）, alone with increase of oxygen content, elemental sulfur was little decreased and elemental iron, silicon and aluminum were little increased. Between PM1 and PM1-10, varied oxygen content had more influence on PM1.