ThyssenKrupp Steel AG has developed a numerical model tostudy the combustion of coal particles which are fed into theblast furnace through the tuyeres. The basic aim is to evaluatevarious coal lance / tuyere configurations and assess theiradvantages or drawbacks for successful operation. In theULCOS project, this model was used to check the feasibilityof some tuyere configurations for the Top Gas Recycling BlastFurnace process, which is especially challenging regardingtuyere design, combustion kinetics and raceway size.