Formation mechanism and Kinetics of NOx in Sintering Process

Abstract

Iron ore powder is the main source of NO_x in the sintering process. The existing end treatment technology is difficult to cure environmental hazards due to high cost and secondary pollution. Therefore, in this study, through the NO_x generation experiments and mechanism analysis of five kinds of iron ore powder, the low emission characteristic ore powder was selected for actual production. The results show that the NO_x emission concentration of different iron ore powders varies with temperature. As the temperature increases, the peak concentration of NO_x becomes larger, the peak time becomes shorter, and the harm becomes greater. Among them, the process concentration and peak concentration of Sijiaying powder are relatively low in the sintering process. The pre-exponential coefficient and activation energy of the apparent rate of NO formation interface reaction, the pre-exponential coefficient of the effective diffusion coefficient of gas diffusion in the product layer, and the activation energy of atomic movement are the lowest.