钢铁工业排放颗粒物中碳组分的特征

发布时间：2018-05-02 07:18

本文选题：钢铁工业 + 烧结工艺　；参考：《环境科学》2017年08期

【摘要】：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.
[Abstract]:In order to investigate the characteristics of carbon components in particulates emitted from iron and steel industry, three groups of sinter furnaces with different loads and decontamination facilities and one group of pellets from ironmaking blast furnace were collected by means of charged low pressure particle impactor (ELPI). The organic carbon (OC) and elemental carbon (ECC) in particulate matter were analyzed by thermo-optical reflectance method, and the seven carbon components classified by temperature were analyzed. The results showed that the mass fraction of OC in particulates emitted by sintering process was higher than that in iron making process (P < 0.05). The mass fraction of OC was 5.3 卤2.3% and 7.1 卤3.0%, respectively, which indicated that OC was easily enriched in fine particle size. The relative proportions of seven carbon components of four groups of samples are 2.5% and 2.0% respectively. The mass fraction of OC2 and OC3 is the highest in the seven carbon components and the mass fraction of EC1 / EC2 / EC3 decreases in turn. Scores may be related to boiler size and desulphurization facilities; In addition, the correlation between OC and EC in particulate matter of each particle size was higher. The OC/EC in primary discharge of PMSP 2.5) was 4.7 卤0.7, which was much higher than the index value of estimating the secondary carbon component in the receptor. The analysis of the carbon components in the particulates emitted from the iron and steel industry can provide the basic data for the source analysis of the carbon aerosols, and also contribute to the subsequent decontamination management of the iron and steel industry.
【作者单位】：南开大学环境科学与工程学院国家环境保护城市空气颗粒物污染防治重点实验室;
【基金】：国家重点研发计划项目(2016FYC0208500,2016FYC0208505)
【分类号】：X757

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