120 t复吹转炉底吹供气强度和炉底渣层控制的研究

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

通过将120 t顶底复吹转炉底吹供气强度由0.026 m^3/(t·min)提高到0.103 m^3/(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0.0031%降低至0.0023%、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。

The bottom blowing gas supply intensity of 120 t top and bottom combined blowing converter was increased from 0.026 m^3/(t·min)to 0.103 m^3/(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 0.0031%to 0.0023%,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.