炼钢

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120 t复吹转炉底吹供气强度和炉底渣层控制的研究

富 强,郭晓春,俞 潮   

  1. (本钢集团 北营炼钢厂,辽宁 本溪 117017)
  • 接受日期:1900-01-01 出版日期:2020-02-05

Research on the gas supply intensity and bottom slag layer thickness in 120 t top-bottom combined blowing converter

  • Accepted:1900-01-01 Online:2020-02-05

摘要: 通过将120 t顶底复吹转炉底吹供气强度由0.026 m3/(t·min)提高到0.103 m3/(t·min),为钢水提供动力学条件;同时降低炉底渣层厚度,由200~300 mm降低到50~100 mm,减少供气阻力,增加钢水的动力学条件,加强钢水搅拌使钢渣充分融合,促进碳氧反应降低钢水终点氧含量。转炉终点钢水碳氧积从0.003 1 降低至0.002 3 、终渣FeO质量分数从18.64 %降低至18.12 %,有效提高了钢水洁净度,改善了钢水质量。

关键词: 顶底复吹, 碳氧积, 洁净度

Abstract: The bottom blowing gas supply intensity of 120 t top and bottom combined blowing converter was increased from 0.026 m3/(t·min) to 0.103 m3/(t·min), which provides dynamic conditions for molten steel. At the same time, the bottom slag layer thickness was reduced from 200-300 mm to 50-100 mm, reducing gas supply resistance, increasing the dynamic conditions of molten steel, strengthening the stirring of molten steel, promoting the carbon oxygen reaction and reducing the end point oxygen content of molten steel. The [%C][·[%O] in the end-point of converter was reduced from 0.003 1 to 0.002 3, and the FeO mass fraction in the end-point slag was reduced from 18.64 % to 18.12 %, which effectively improves the cleanliness and quality of molten steel.

Key words: top and bottom combined blowing, [%C]·[%O], cleanliness