钢液温度和硫含量对脱氮动力学了影响

Numerical Simulation of Direct Reduction Process of Carbon-Bearing Pellets

在ＬＥＣＯ４３６氧氮分析仪上研究了１６００～２８１３℃温度范围内钢液脱氮动力学。结果表明：温度低时，脱氮受液相边界层传质及界面化学反应混合控制，温度高时，脱氮受液相边界层传质过程控制。在２２５０℃以下，温度对的影响服从Ａｒｒｈｅｎｉｕｓ公式。硫对脱氮的阻碍作用随着温度的升高而降低，在温度２２５０℃以上，硫的表面活性作用消失。

Abstract Based on equations of mass conservation, energy conservation and chemi- cal reaction rates, a mathematical model of direct reduction process of carbon-bearing pellets was developed. The calculated results of mathematical model agree with the experi-- mental results. Numerical simulation results are shown as follows: Furnace temperature is the most important factor affecting on the reduction rate of pellets, so that it is neces- sary to heat carbon-bearing pellets under high furnace temperature. Either for larger pellets or for smaller pellets high metallization can be obtained when the heating time is long enough, although reduction rate of larger pellets is lower than of smaller pellets during the beginning period. For realizing higher metallization and faster reduction rate, the pellets should contain su