烟气分析在120 t转炉的应用

Application of Flue Gas Analysis in 120 t Converter

利用转炉烟气分析系统获取烟气成分与流量数据,依据碳平衡原理构建碳积分模型,动态预测钢水中的碳含量(质量分数)及温度。该模型在陕西龙门钢铁有限公司的120 t转炉上得到应用,有效指导了转炉冶炼过程,减少了终点补吹次数,并降低了一次脱磷率。研究结果表明,模型显示出良好的适应性与高准确度,对于该公司120 t转炉的冶炼生产起到了重要的指导作用。在排除了铁水成分、温度测量异常以及废钢重量异常等因素影响的有效炉次中,当终点碳含量w(C)<0.2%时,该模型预测的偏差<0.02%,准确率达到86.38%。当终点温度预测的偏差<15℃时,准确率高达94.42%。同时,满足碳含量与温度预测准确的C-T双命中率为81.49%,达到了冶炼过程对终点命中率的要求。

In this study,a carbon integral model was developed to predict the carbon content and temperature of molten steel based on the carbon balance principle.The model was applied to a 120-ton converter at Longmen Iron and Steel Co.,Ltd.in Shaanxi Province,which effectively guides the converter smelting process,reduces the end-point refilling times and reduces one time dephosphorization rate.The results show that the model shows good adaptability and high accuracy,and plays an important role in the company's 120-ton converter smelting production.When the end-point carbon content(w(C))is less than 0.2%,the predicted deviation of the model is less than 0.02%in the effective furnace with the factors such as composition of hot metal,abnormal temperature measurement and abnormal weight of scrap excluded,the accuracy of the prediction was 86.38%,the accuracy of the prediction was 94.42%when the deviation was less than 15℃,and the accuracy of the prediction of C-T was 81.49%,the requirement of terminal hit ratio in smelting process is achieved.