Find in Library

Raw material with a high Al₂O₃ content has led to an increase in the Al₂O₃ content in blast furnace slag, which has affected the normal operation of a blast furnace. The exergy analysis method is an important method for studying the energy utilization of high-alumina blast furnace smelting. In this paper, to investigate the impact of slag composition on exergy efficiency and optimize exergy efficiency during the smelting process of high Al₂O₃ iron ore, a gray box exergy analysis model of blast furnace smelting and an objective function for minimizing the total exergy loss were developed. The results indicated that the blast furnace smelting process had an exergy efficiency (<i>η</i>) of 28.29% for hot metal and slag; the exergy efficiency of the blast furnace did not significantly increase with the increasing <i>w</i>(MgO)/<i>w</i>(Al₂O₃) and <i>R</i> (<i>w</i>(CaO)/<i>w</i>(SiO₂)), but the exergy efficiency of the blast furnace declined with increasing <i>w</i>(Al₂O₃). The regional optimal solution for the objective function method was 7129.42 MJ with slag compositions of <i>R</i> = 1.295, <i>w</i>(MgO)/<i>w</i>(Al₂O₃) = 0.545, and <i>w</i>(Al₂O₃) = 15%.