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为探究钢铁工业排放颗粒物中碳组分的特征,使用荷电低压颗粒物撞击器(ELPI)采样,采集到3组不同载荷和除污设施的烧结炉和1组炼铁高炉排放的颗粒物样品,利用热-光反射法,分析颗粒物中的有机碳(OC)和元素碳(EC)以及按温度划分的7种碳组分物质.结果表明,烧结工艺排放颗粒物中OC的质量分数高于炼铁工艺,OC在PM_(10)和PM_(2.5)质量分数分别是(5.3±2.3)%和(7.1±3.0)%,说明OC易在细粒径段颗粒富集,炼铁工艺排放颗粒物中OC在PM_(10)和PM_(2.5)质量分数分别是2.5%和2.0%;4组样品的7种碳组分相对比例相似,OC2和OC3在7种碳组分中质量分数最高,EC1、EC2、EC3的质量分数依次递减,OC1的质量分数可能与锅炉规模和脱硫设施有关;另外,烧结工艺排放各粒径段的颗粒物中OC和EC表现出较高的相关性,一次排放的PM_(2.5)中的OC/EC为4.7±0.7,远高于受体中估算二次碳组分的指标值.钢铁工业排放颗粒物中碳质组分的深入分析,可以为受体碳质气溶胶的来源解析提供基础数据,也有助于钢铁工业后续的除污管理.
In order to investigate the characteristics of carbon components in particulate matter emitted by the iron and steel industry, three samples of sintering furnaces and one group of particulate matter discharged from ironmaking blast furnaces were collected by ELPI sampling. (OC) and elemental carbon (EC) in the particulate matter and seven kinds of carbon components by temperature were analyzed.The results showed that the mass fraction of OC in the particulate matter of the sintering process was higher than that of the iron making process (5.3 ± 2.3)% and (7.1 ± 3.0)%, respectively. The results show that OC is easy to enrich in the particles with fine particle diameter and OC in the iron making process The mass fraction of PM_ (10) and PM_ (2.5) were 2.5% and 2.0% respectively. The relative proportions of seven carbon components in four samples were similar, and the highest content of OC2 and OC3 in seven carbon components. The mass fraction of EC3 decreases in turn, and the mass fraction of OC1 may be related to the boiler size and desulphurization facilities. In addition, the correlation between OC and EC in particulate matter of each particle size of sintering process is significant. The emission of PM_ (2.5) In the OC / EC of 4.7 ± 0.7, much higher than the estimated value of the second carbon component of the receptor. Iron and steel industry emissions particles In-depth analysis of the carbonaceous component, may parse provide basic data for receptor sources of carbonaceous particles also help manage the steel industry subsequent decontamination.