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| Mechanisms of ultrafine particle formation during coal combustion in a new swirl modification device |
| Jun-xiang Guo1,2 Ling-ling Zhang2 Wen-bin Dai3 Li-ying Qi4 Ru-fei Wei3 Da-qiang Cang1 |
| 1 School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China 2 School of Energy and Environment Engineering, University of Science and Technology Beijing, Beijing 100083, China 3 State Key Laboratory of Solid Waste Reuse for Building Materials (SKL-SWR), Beijing Building Materials Academy of Sciences Research (BBMA), Beijing 100083, China 4 College of Energy and Environmental Engineering, Hebei University of Engineering, Handan 056038, Hebei, China |
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Abstract A new swirl combustion device was designed and enhanced, which realized the utilization of steel slag, achieved highly efficient and clean coal combustion, and simultaneously realized a fully elemental utilization of coal. The distribution laws of different sized particulate matter (PM) emission and the enrichment laws of elements in particles under diverse conditions (such as various excess air coefficients and different coal ratios) were systematically studied. The enrichments of PM under both non-staged and fuel-staged conditions were also investigated. The results indicated that fuel-staged combustion is more helpful in reducing PM emissions than non-staged combustion, and a suitable coal ratio is also beneficial for reducing PM emissions. The melted liquid steel slag drop captured the fly ash produced from pulverized combustion, thus reducing PM emission. The alkali metal elements (K, Na, and Mg), the trace elements (As and Ti), and S have an obvious enrichment tendency in PM1 and PM2.5. A different coal ratio under fuel-staged combustion has a significant influence on the enrichment of Al, Si, Ca, and Fe in PM1, whereas in PM2.5, PM4, and PM10, the effect of different coal ratios on the enrichment of each element is slight.
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| Cite this article: |
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Jun-xiang Guo,Ling-ling Zhang,Wen-bin Dai, et al. Mechanisms of ultrafine particle formation during coal combustion in a new swirl modification device[J]. Journal of Iron and Steel Research International, 2019, 26(1): 11-19.
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2019, Vol. 26 
