摘要
基于某钢厂高炉的实际原燃料条件,采用实验室试验、数学模型构建与生产数据分析相结合的方法,试验研究了不同类型废钢(包括粒子钢和渣钢粒)对综合炉料软熔滴落性能的影响,通过建立高炉使用废钢的物料-热平衡数学模型,分析了废钢添加对燃料消耗的影响规律,并结合该钢厂高炉实际生产数据进行了对比验证。软熔滴落试验结果表明,在综合炉料中添加质量分数为5.0%的废钢(包括粒子钢和渣钢粒)时,滴落铁的成分和熔点未发生显著变化,但滴落渣中FeO含量有所增加,软熔带厚度变窄,透气性得到显著改善。其中,粒子钢对软熔带厚度变窄和透气性改善的效果明显优于渣钢粒。当添加废钢质量分数大于5.0%时,滴落铁熔点呈现上升趋势,软熔带厚度增加,透气性变差。物料-热平衡模型计算结果显示,废钢加入量为100 kg/t时,综合炉料品位提升2.68%,矿比降低171 kg/t,焦比下降38.5 kg/t,渣比减少32.94 kg/t,直接还原度略有上升(5.74%)。实际生产数据验证表明,在此添加量下,高炉日产量提高600 t/d,利用系数增幅达6.6%,燃料比降低30 kg/t,但煤气利用率略有下降(约1%);此外,当添加废钢质量分数低于5.0%时,高炉透气性可获得显著改善,但随着添加量继续增加,透气性变差。通过对比分析发现,实验室试验数据、数学模型计算结果与生产数据具有良好的一致性。研究结果为高炉合理使用废钢提供了理论依据和技术支撑,对优化高炉冶炼工艺、降低生产成本具有重要的指导意义。
The foundation of this study is established based on the actual raw material and fuel conditions of the blast furnace in a specific steel plant.It combines laboratory experiments,mathematical model construction,and production data analysis to experimentally investigate the effect of different types of scrap(including particle steel and slag steel particles)on the softening-melting-dripping property of the mixed burden.By establishing a material-heat balance mathematical model for the use of scrap in the blast furnace,the impact of scrap addition on fuel consumption was analyzed,and the results were compared and validated with actual production data from the steel plant's blast furnace.The softening-melting-dripping experimental results show that when 5.0%(mass fraction)scrap(including particle steel and slag steel particles)is added to the mixed burden,the composition and melting point of the dripping iron do not change significantly,but the FeO content in the dripping slag increases,the thickness of the cohesive zone narrows,and the permeability is improved dramatically.Among them,particle steel has a more pronounced effect on narrowing the cohesive zone and improving permeability than slag steel particles.When the scrap addition exceeds 5.0%(mass fraction),the melting point of the dripping iron tends to increase,the thickness of the cohesive zone increases,and the permeability deteriorates.The material-heat balance model calculations show that when the scrap addition is 100 kg/t,the grade of the mixed burden increases by 2.68%,the ore ratio decreases by 171 kg/t,the coke ratio decreases by 38.5 kg/t,the slag ratio decreases by 32.94 kg/t,and the direct reduction rate slightly increases to 5.74%.Actual production data validation indicates that at this addition level,the daily output of the blast furnace increases by 600 t/d,the utilization coefficient improves by 6.6%,and the fuel ratio is reduced by 30 kg/t,while the gas utilization rate experiences a slight decline of approximately 1%.Furthermore,when the scrap addition is below 5.0%(mass fraction),the permeability of the blast furnace can be significantly improved,but as the addition continues to increase,the permeability deteriorates.Comparative analysis shows good consistency between the laboratory experimental data,mathematical model calculation results,and production data.The research results provide a theoretical basis and technical support for the rational use of scrap in blast furnaces,offering important guidance for optimizing blast furnace smelting processes and reducing production costs.
作者
周进东
高彩
邹楠鹏
熊玮
毕学工
郑华伟
张正东
李昕
ZHOU Jindong;GAO Cai;ZOU Nanpeng;XIONG Wei;BI Xuegong;ZHENG Huawei;ZHANG Zhengdong;LI Xin(Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education,Wuhan University of Science and Technology,Wuhan 430081,Hubei,China;Ironmaking Plant,Wuhan Iron and Steel Co.,Ltd.,Wuhan 430080,Hubei,China)
出处
《钢铁》
北大核心
2025年第8期43-54,共12页
Iron and Steel
基金
国家自然科学基金资助项目(61933015,51604199)
武汉科技大学青年科技骨干培育计划资助项目(2016xz003)。
关键词
废钢
废钢加入量
软熔滴落特征
滴落渣/铁
物料-热平衡模型
燃料消耗
焦比
Rist操作线
scrap
scrap charging
softening-melting-dripping property
dripping slag and iron
material-heat balance model
fuel consumption
coke ratio
Rist operation line
作者简介
周进东(1982-),男,博士,副教授,E-mail:wuhan507@163.com;通信作者:熊玮(1975-),男,博士,教授,E-mail:xiongwei@wust.edu.cn。
