Mechanisms of ultrafine particle formation during coal combustion in a new swirl modification device

  • Jun-xiang Guo
  • Ling-ling ZhangEmail author
  • Wen-bin Dai
  • Li-ying Qi
  • Ru-fei Wei
  • Da-qiang CangEmail author
Original Paper


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.


Coal combustion Steel slag modification Particulate matter Elemental enrichment Fuel-staged feed Non-staged feed Swirl modification device 



The authors are grateful for the Open Project Funding from State Key Laboratory of Solid Waste Reuse for Building Materials (No. SWR-2017-005), and Science and Technology Planning Project of Handan City (No. 1621212047).


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Copyright information

© China Iron and Steel Research Institute Group 2018

Authors and Affiliations

  1. 1.School of Metallurgical and Ecological EngineeringUniversity of Science and Technology BeijingBeijingChina
  2. 2.School of Energy and Environment EngineeringUniversity of Science and Technology BeijingBeijingChina
  3. 3.State Key Laboratory of Solid Waste Reuse for Building Materials (SKL-SWR)Beijing Building Materials Academy of Sciences Research (BBMA)BeijingChina
  4. 4.College of Energy and Environmental EngineeringHebei University of EngineeringHandanChina

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