Numerical simulation of smelting characteristics in moving-bed of melter gasifier

The melted gasifier packed bed is the main smelting place for smelting prereduced charge into liquid hot metal and using lump coal to generate large amount of reduced gas for prereduction shaft furnace. In this paper, a one-dimensional steady-state mathematical model of a melted gasifier packed bed was established. The temperature and composition distribution of the reduced gas and solid charge in the packed bed were numerically simulated. The results show that sponge iron gradually melts into liquid molten iron as the solid charge decreases when the temperature difference between sponge iron and lump coal and flux is relatively large, To the bottom of the packed bed, hot metal temperature is up to 1 774 K. On the other hand, with the increase of gas flow, the pyrolysis of lump coal increased the volume concentration of H₂ significantly, and the volumetric concentration of CO₂ gradually increased with flux decomposition and sponge iron reduction. At the upper part of the packed bed, the volume concentration of CO stabilized at 71.8 %.