京唐高炉低硅高温冶炼操作特点探析

Analysis on Operation Features of Low Silicon and High Temperature Smelting Operation of Jingtang's BF

简要分析了大型高炉低硅高温冶炼的机理,并对京唐高炉低硅高温冶炼的生产实践进行了总结。热力学分析表明,高风压、高富氧率会增大煤气中的CO分压,从而抑制了炉渣中(SiO_2)的还原,降低了铁水中[Si]含量,因而高风压、高富氧操作是实现低硅高温冶炼的主要途径。京唐高炉通过调整送风制度,缩小风口面积,鼓风动能控制在115～149kJ/s,逐步实现了低硅高温冶炼,同时炉缸活跃性不断改善。

The mechanism of low-silicon high-temperature smelting of large sized BF is analyzed briefly, followed by sum- marization of production practices in low-silicon and high-temperature smelting of Jingtang＇s BF. Thermodynamic analysis shows that high blast pressure and high oxygen enrichment rate will increase fractional pressure of CO in the gas, which may suppress the reduction of SiO2 in the slag and results in lower content of [Si] in hot metal. Therefore, high blast pressure and high oxygen enrichment rate are the main measure to achieve low silicon and high temperature smelting. By adjusting the hlast supply system, reducing the area of BF tuyere, the blast kinetic energy is kept at 115 to 149 kJ/s, making low-silicon high-temperature smelting become possible and furnace hearth activity improved constantly.