7TH EUROPEAN COKE AND IRONMAKING CONGRESS - ECIC 2016

The impact from lance design, blast parameters and type of injection materials on combustion conditions in the raceway have been investigated both theoretically and in operational injections tests in the LKAB Experimental BF (EBF). A CFD model for the EBF is developed and the modelling results validated with experimental data deduced from additional monitoring devices including high-speed camera and temperature measurements at the tuyere. The conditions with two different lances (coaxial and swirl-tip) and the injection of medium volatile coal with or without addition of torrefied biomass or lignite coke is explored as well injection of torrefied biomass only. Kinetic parameters for volatilisation, combustion and gasification of injection material used in the CFD model were determined by using thermo-gravimetric analyses (TGA). Consistency between modelling results and monitoring data was stated and the impact from different injection conditions is discussed.