MATHEMATICAL-MODEL FOR POST COMBUSTION IN SMELTING REDUCTION

Post combustion in the top space of iron bath smelting reduction furna ces is analysed with three-dimensional mathematical modelling. Momentu m transport and continuity equations in combination with a k-epsilon m odel of turbulence are numerically solved for the gas flow field. Comb ustion reactions are modelled by a set of transport equations based on the SCRS combustion model and its extension to the k-epsilon-g model. A two-stage combustion scheme is formulated to include carbon transfe r and combustion. Heat transfer to bath and droplets is approximated i ncluding radiation. Computation results for rectangular reactors are p resented with velocity patterns and combustion fields. The complex sha pes of post combustion flames are demonstrated. Process parameters are varied to study their influence on combustion and heat transfer to th e bath. Effects of the injection geometry are illustrated.