300t转炉终点碳氧积控制技术研究

炼钢

300t转炉终点碳氧积控制技术研究

李勤，王立永，丁立丰，刘延强，范立新

（首钢京唐钢铁联合有限责任公司，河北唐山 063200）

接受日期:1900-01-01 出版日期:2019-10-05

Study on control technology of carbon-oxygen equilibrium atblowing end-point of300t BOFsteelmaking

Accepted:1900-01-01 Online:2019-10-05

摘要/Abstract

摘要： 为了进一步提高转炉终点控制的稳定性，从改善动力学角度分析了影响碳氧积的主要因素，并通过工业试验确定了降低转炉碳氧积的控制技术。研究结果表明：转炉底吹元件为4支，底吹元件在炉底圆周上布局为0.55D时，钢水混匀时间最短；补炉料中粒径0~1mm镁砂占比20%，高温抗折强度由改进前的4.2MPa提升到了5.3MPa，透气度提升了227%；采用底吹热更换技术后转炉终点氧质量分数进一步降低，由482×10-6降低至425×10-6，降低了57×10-6。通过以上措施，炉底底吹元件实现了全炉役可视化，全炉役碳氧积由0.00238降低至0.00178。

关键词: 复吹转炉, 碳氧积, 转炉补炉料, 底吹快换技术

Abstract: In order to further improve the stability of end-point control of converter，the main factors affected the carbon-oxygen equilibrium of converter were analyzed from the point of view of improving kinetics，and the control technology of reducing the carbon-oxygen equilibrium of converter was determined by industrial test. The results showed that，the mixing time of molten steel was the shortest when the number of tuyereswas 4 and the layout of tuyereswas 0.50D on the circumference of the converter bottom；the proportion of particles size of magnesia 0—1mm in the fetting materialwas 20%，the high temperature flexural strength was increased from 4.2MPa to 5.3MPa，and the permeability was increased by 227%. The oxygen mass fraction at the end of the converter further decreasedfrom 482×10-6 to 425×10-6，reduced by 57×10-6by employingthe quick change technology of the tuyere for converter. Through the above measures，the visualization of the tuyerewas realizes in the whole campaign life，and the carbon-oxygen equilibrium wasreduced from 0.00238 to 0.00178 in the whole campaign life.

Key words: combined converter, carbon-oxygen equilibrium, fetting material for converter, quickchange technology of tuyere

李勤，王立永，丁立丰，刘延强，范立新. 300t转炉终点碳氧积控制技术研究[J]. 炼钢.

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