中文摘要：

采用管式炉研究了在O2／CO2气氛下燃烧温度对PM2．5排放特性的影响．实验采用荷电低压撞击器（ELPI）采集和分析燃烧后的PM25．结果表明，燃烧温度是燃烧过程中影响PM25生成的重要因素．对于徐州烟煤，不同燃烧温度下生成的PM25质量粒径分布均呈双峰分布，峰值分别在0．1μm和2．0μm附近；随着燃烧温度的提高，PM2.5质量浓度增加；S、K和Na在亚微米颗粒上明显富集；而Si和Ca在亚微米颗粒上无富集现象；亚微米颗粒主要是矿物质蒸发一凝结机理形成的，而超微米颗粒主要是煤焦与外部矿物质的破碎以及内在矿物质聚合形成的．

英文摘要：

The influence of combustion temperature on the emission characteristics of PM2.5 （particulates with the aerodynamic diameter of less than 2.5 μm） was studied using a tube furnace. The PM2.5 generated from coal combustion was collected and analyzed by an electrical low pressure impactor （ELPI）. The results indicate that combustion temperature is an important factor in the formation of PM2.5 during coal combustion under O2/CO2 atmosphere. The size distributions of PM2.5 are similar, which display two peaks around 0.1 μm and 2.0 μm, respectively. With the rise of combustion temperature, the mass concentrations of PM2.5 increase. Enrichment of S, Na and K is observed in PM1, but no enrichment of Si and Ca is found in PM1. PM1 particles are formed based on the mechanism of vaporization and condensation, while supermicron-size ash particles are formed due to the coagulation and coalescence of submicron-size ash, and fragmentation and coalescence of mineral matter.