在高温沉降炉中进行了大同烟煤的燃烧实验,燃烧气氛为O2/N2=21∶79、O2/CO2=21∶79和O2/CO2=29∶71,采用旋风分离器和DGI(承重撞击器)系统分别收集燃烧产生的粗灰及颗粒物,并应用ICP-MS测量其中As和Pb两种元素的含量.实验结果表明,相较于O2/N2气氛,O2/CO2气氛会抑制颗粒物的生成,在O2/CO2燃烧气氛下,提高氧浓度将促进颗粒物的生成;O2/CO2气氛相较于O2/N2气氛,会提高颗粒物中As、Pb的浓度,特别是PM0.2-0.5;O2/CO2气氛下,提高氧气浓度将降低颗粒物中As、Pb的浓度,特别是PM0.2-0.5;所有燃烧工况下,As、Pb两种元素都大量富集于颗粒物之上,颗粒粒径越小,富集现象越明显,并在PM0.2-0.5处显著增强.
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