【摘要】 介绍了转炉炉气分析动态控制模型的原理、操作过程及应对终点碳高的措施,并对终点熔池碳含量和脱碳速度的关系进行研究,得出如下结论:为保证终点预测的稳定,吹炼结束前2 min不变枪位、不添加辅料;终点碳含量高,需低枪位过吹到w([C])<0.04%,或CO2和N2曲线交叉后继续吹15 s,再决定提枪;考虑到枪位对脱碳速度的影响,吹炼终点碳含量和脱碳速度的关系可以用3次方函数表述;只有减小原料条件的波动和稳定操作,才可用热平衡方法预测吹炼终点熔池温度。更多还原

【Abstract】 The principle,operation of BOF off-gas analysis dynamic control model and measures to deal with excese carbon content at end-point are introduced.The relation ship between carbon content in bath and decarbonization rate was studied.The conclusions are: To ensure the stability of the end-point prediction,the lance position should be fixed and no additions should be charged 2 min before blowing end;w[C]<0.04% should be reached with low lance position,or blowing 15 s after cross of CO2 and N2 curves,before deciding whether to raise lance when the carbon content is high at end-point;Taking into account the impact of lance position on decarbonization rate,the relation ship between carbon content and decarbonization rate at end-point can be expressed by a cubic function;Thermal equilibrium can be used for predicting bath temperature at end-point only with stable raw materials supply and operation.更多还原