| 炼焦工序颗粒物排放特征 |
| 摘要点击 2617 全文点击 1039 投稿时间：2018-03-27 修订日期：2018-05-30 |
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| 中文关键词 炼焦工序 颗粒物 形貌 粒径分布 化学成分 |
| 英文关键词 coking process particulate matter morphology particle size distribution chemical composition |
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| 中文摘要 |
| 为探究钢铁企业炼焦工序各排放源颗粒物的排放特征，根据固定污染源排气中颗粒物测定与气态污染物采样方法，使用崂应3012H自动烟尘（气）测试仪和安德森分级采样器对某钢铁企业炼焦工序的装煤/推焦、干熄焦排气、筛焦转运等环节的颗粒物排放源进行现场采样.将不同排放源的颗粒物分别进行了微观形貌、粒径分布和化学成分分析.结果表明，各排放源单颗粒分为富铁、富硅、富钙、炭质和烟气聚合体这5种类型，外观上主要呈多角块状、不规则层片、团状和絮状4种形态；装煤/推焦排放颗粒物的粒径集中在3.3~4.7 μm，干熄焦排气为3.3~4.7 μm和5.8~9.0 μm，筛焦转运为4.7~5.8 μm；炼焦工序各排放源颗粒物的主要化学成分为C、SiO2、Al2O3、S、CaO、TFe，质量分数分别为76.30%~81.30%、5.36%~5.91%、3.96%~4.26%、1.15%~1.34%、0.52%~1.59%、0.81%~1.34%. |
| 英文摘要 |
| To investigate the particulate matter emission characteristics of various emitting sources of the coking process of iron and steel plants, an automatic dust (smoke) tester and an eight-staged Anderson sampler were employed to conduct onsite sampling of particulate matter emissions from the coking process, including coal loading and coke pushing, coke dry quenching exhaust and coke screening and transferring in a steel plant, based on the measurement of particulate matter in the exhaust of fixed sources and sampling of gaseous pollutants. The morphology, particle size distribution, and chemical composition of the particulate matter from different sources were investigated. The results show that the single particles can be divided into five categories:iron-rich, silicon-rich, calcium-rich, carbon, and smoke polymer. They mainly appear in four forms:polygon block, irregular lamellae, lumps, and floc. The particle size of the coal loading and coke pushing unit mainly is 3.3-4.7 μm, while it is 3.3-4.7 μm and 5.8-9.0 μm for the dry quenching exhaust and 4.7-5.8 μm for the coke screening and transferring unit. The main chemical components of particulate matter in the coking process are C, SiO2, Al2O3, S, CaO, and TFe, with contents of 76.30%-81.30%, 5.36%-5.91%, 3.96%-4.26%, 1.15%-1.34%, 0.52%-1.59%, and 0.81%-1.34%, respectively. |
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