The effects of operational parameters on flue gas recirculation iron ore sintering process: sensitivity analysis based on numerical simulation and industrial onsite experimental validation

摘要

A one-dimensional mathematical model is adopted to analyse influences of operational parameters on process performance during flue gas recirculation sintering (FGRS). Simulation results show that FGRS can enhance combustion characteristics and improve distribution of heat. Subsequently, the sensitivity coefficient is used to study contribution of operational parameters to quality and productivity of sintered ore. Sensitivity analysis shows the order of sensitivity of productivity is O-2 content > gas supply > temperature, while that of quality is O-2 content > temperature > gas supply. The optimal regulation strategy is that O-2 content should be controlled first before temperature and that gas supply should be closely controlled. The optimum O-2 content range is 19-20 vol.-% and the optimum temperature is around 200 degrees C. Gas supply of FGRS should increase by 4.17%. Finally, an industrial test was carried out, which indicated that the optimal regulation strategy is reasonable.