To meet the requirements of Angang's blast furnace smelting for sintering output, improve the double-layer sintering process, and determine the appropriate parameters for the double-layer sintering process, this article established a mathematical model and simulated the temperature field in the burden bed and the changing trends of O2 and CO2 concentrations in the sintering tail gas during the single-layer and double-layer sintering processes of the sintering machine. The simulation results show that (1) compared with the sintering time of single-layer sintering in the baseline period, the error of the single-sintering model is only about 2.5%, and the model's accuracy is high. (2) Two combustion zones of double-layer sintering increase O2 consumption, and the O2 concentration in the tail gas decreases significantly. (3) The thickness of the upper and lower feeding layers of double-layer oxygen supplement sintering is 650 + 300 mm better than that of 600 + 350 mm. (4) The optimal secondary ignition time is 15 min.
© 2022 The Authors. Published by American Chemical Society.