CFD Model of Coal Blends Combustion and Effects of Some Parameters

  • Yansong Shen, School of Materials Science and Engineering, University of New South Wales, Sydney, NSW 2052, Australia, Australia
  • Dr Baoyu Guo, School of Materials Science and Engineering, University of New South Wales, Sydney, NSW 2052, Australia, Australia
  • Professor Aibing Yu, School of Materials Science and Engineering, University of New South Wales, Sydney, NSW 2052, Australia, Australia
  • Dr Paul Zulli, BlueScope Steel Research, P.O. Box 202, Port Kembla, NSW 2505, Australia, Australia

    • Pulverised coal injection of coal blends is widely practised in blast furnace. It is important to understand and optimize the flow and combustion behaviour of coal blends. This paper describes a comprehensive three-dimensional numerical model for binary coal blends. In this model, two coals are tracked separately and various combustion mechanisms are considered for char reactions rates. The model has been applied to a pilot-scale combustion rig, which features an inclined co-axial lance, and the effects of some operational parameters on final burnout are investigated. The simulation results indicate that: 1) the synergistic effect of final burnout is observed and explained by the interactions between two coals in terms of particle temperature and volatile content; 2) the greater enhancement of final burnout can be achieved when the difference of volatile content between two coals is larger. Good agreement between the predicted and measures results is observed. The model provides an effective tool for design of coal blends in the practice of blast furnace.