【摘要】 为了提高复吹转炉熔池的搅拌效果,在实验室研究了复吹转炉不同底枪支数和布置对转炉熔池混匀时间的影响。试验研究表明,底枪适合于布置在(0.40~0.65)D(D为熔池直径)的范围,底枪过多且对称分散均匀布置在同一圆周,不利于转炉整个熔池的混匀,而采用非对称相对集中的底枪布置,可以使熔池产生水平搅拌趋势,有利于整个转炉熔池混匀,缩短熔池混匀时间30%左右。在福建三钢(集团)有限责任公司实际复吹转炉应用非对称相对集中的底枪布置,可以改善转炉吹炼终点的冶金效果,1号、2号100 t转炉吹炼终点平均[%C]·[%O]由原来的0.003 1、0.003 3分别降低到0.002 6、0.002 7,1号转炉平均残锰质量分数由原来的0.183%提高到0.212%,终点平均磷质量分数由原来的0.016 7%降低到0.014 8%,平均终渣w(TFe)由原来的15.23%降低到13.36%,120 t转炉吹炼终点平均[%C]·[%O]为0.002 5。更多还原

【Abstract】 Influence of different bottom tuyere number and configuration in top and bottom combination blown converters on bath mixing time was investigated in laboratory for improvement of BOF’s bath stirring effect. It is found from the investigation that the suitable arrangement where the bottom tuyeres should be set is( 0. 40- 0. 65) D( D is bath diameter). Too many bottom tuyere number and symmetrical,dispersive and uniform configuration along the same circumference is detrimental for the whole bath mixing,while unsymmetrical and relatively concentrative bottom tuyere configuration can form the trend of horizontal mixing in the bath,which is benefit to the whole bath mixing and can decrease the mixing time by about 30 %. It is proved from the application of the unsymmetrical and relatively concentrative bottom tuyere configuration in industrial converters of Sansteel,Fujian that the metallurgical results at converter blowing end point can be improved. Mean product of [C]and [O]concentrations,[%C]·[%O ],at end-point of blowing in No. 1 and No. 2 100 t BOFs were reduced from 0. 003 1,0. 003 3 to 0. 002 6,0. 002 7,respectively. In No. 1 BOF,average [Mn]mass fraction at end point was increased from 0. 183 % to 0. 212 %,mean [P]mass fraction at blowing end point was decreased from0. 016 7 % to 0. 014 8 %,and average w( TFe) in slag at end-point of blowing was reduced from15. 23 % to 13. 36 %. Mean [%C]·[%O]at end-point of blowing in 120 t BOF was 0. 002 5.更多还原