A Numerical Study on the Combustion Phenomena Occurring at the Post Combustion Stage in Bath-type Smelting Reduction Furnace.

Abstract

The turbulent combustion phenomena in the gas phase occurring at the post combustion stage in a bath-type smelting reduction process was simulated by use of a mathematical model, which combinesthe simple chemical reaction system (SCRS)combustion model with instantaneous reaction up to the chemical equilibrium state allowing the concentration fluctuation and the k-8 turbulence model, The finite difference methodbased on the control volume approach was used to solve the transport equations which compose the mathematical model. A 100 ton capacity converter was used as the model of the bath-type smelting reduction furnace. The effects of the injecting method on the oxidation were studied mainly. Thecombustion reaction in the gas phase is concentrated in the vicinity of the oxygen jet boundary. The combustion flame is spread more widely with the decrease of the inlet velocity of injecting oxygen. The efficiency of the post combustion operation was evaluated by the post combustion ratio (PCR) at the outlet of furnace. The post combustion ratio increases with the decrease of inlet velocity of the injecting oxygen and with the increase of the lance height from the iron bath surface.