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o2/co2气氛下o2浓度对燃煤pm2.5形成的影响

, PP. 356-360

Keywords: o2/co2,煤燃烧,pm2.5,形成机理,o2浓度

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Abstract:

?采用管式炉和荷电低压撞击器(electricallowpressure-impactor,elpi)研究了徐州烟煤在o2/co2条件下燃烧后生成的pm2.5排放特性。结果表明,在o2/co2气氛下,煤粉在不同o2浓度燃烧所产生的pm2.5质量浓度均呈双峰分布,峰值分别在0.1和2.0mm左右;随着氧含量的增加,pm2.5的质量浓度增加;s、k和na在亚微米颗粒上明显富集,而si和ca未在亚微米颗粒上富集;通过对颗粒物的粒径分布、元素分析和形貌观察,认为亚微米颗粒主要是矿物质蒸发鄄凝结机制形成的,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。

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