Numerical investigations into burning characteristics of pulverised coal within the BF raceway at various injection lances
- 作者：DU Shan WenHO Chung KenTUNG Che Hsiung
- 会议时间：2013-06-01
- 关键词：blast furnace ; pulverised coal injection ; injection lance configuration
- 作者单位：DU Shan Wen,HO Chung Ken(Ironmaking Process Development Section,Ironmaking & Steelmaking R&D Department,China Steel Corporation,Kaohsiung,Taiwan,China)TUNG Che Hsiung(Blast Furnace Plant I,Ironmaking Department,China Steel Corporation,Kaohsiung,Taiwan,China)
- 母体文献：第五届宝钢学术年会论文集
- 会议名称：第五届宝钢学术年会
- 会议地点：上海
- 主办单位：中国金属学会
- 语种：chi
摘要
For the reduction of the operation cost,pulverised coal injection ( PCI) has become a standard practice in most steelworks worldwide.To aid improving the practical performance of blast furnace,coal combustion behaviours in the raceway of the blast furnace with different lance configurations and oxygen enrichment patterns were simulated in this research.Three lance configurations including single lance,double air- cooled coaxial lance and oxy-coal lance,in which the enriched oxygen flowed through the annulus of the lance as cooling gas,were examined.From the calculated temperature contours,early ignition is found when the double lance is operated due to better dispersion of coal particles in hot blast.Consequently,the coal combustion efficiency in the raceway could be improved.On the other hand,the ignition position for the oxy-coal lance injection is shifted away from the tuyere exit as a result of cooling effect by the enriched oxygen.As indicated by the calculated pressure drop within the combustion region,late ignition provides an advantage in lowering the pressure resistance across the raceway.Moreover,the coal combustion efficiency for the oxy-coal lance injection is not affected since the coal plume is surrounded by the enriched oxygen,which could intensify the combustion as long as the reactions are trigged in the raceway.