顶底侧吹转炉炼钢新技术开发研究及初步应用

Development study and application of new steelmaking technology in a top-bottom-side blown converter

在30t顶底复吹转炉熔池炉壁增加侧吹枪组成顶底侧吹转炉,通过实验室模拟试验,测定不同吹气搅拌技术的转炉熔池的混均时间。结果发现:顶底侧吹搅拌效果最好,熔池混匀时间比原顶底复吹转炉平均降低65%,且熔池混匀时间呈现τ顶底侧吹<τ顶侧吹<τ纯底吹<τ顶底复吹<τ纯顶吹的规律。该技术首先在福建三钢(集团)公司炼钢厂的30t顶底复吹转炉熔池侧壁增加一支侧吹枪进行大生产工业试验,结果表明:顶底侧吹转炉碳氧积低,脱磷效果好,降碳快,全炉役侧吹枪可见,冶炼技术指标得到很大改善。

By installation of a set of side blown elements on the wall of the 30t top-bottom combined blown converter bath the top-bottom-side blown converter is formed and through simulation experiments in the laboratory the mixing time of the converter bath for different blow stirring technologies are measured. Results show that best effect is obtained by top-bottom-side blown process and the mixing time of the bath for the new technology is reduced by 65% in comparison with the original top-bottom process and the mixing time of the bath shows the law of top bottom-side blow〈top-side blow〈 bottom blow exelusively〈top-bottom combined blow.top blow exclusively. The industrial scale experiment of this technology is firstly carried out at the 30t top-bottom combined blown converter of the Steel-making Plant of Sanming Iron ＆ Steel Group Corp. , by installing a set of side blow tuyeres on the side wall of the converter bath. Results demonstrate that the TBS blown converter possesses advantages of lower [%C]·[%O],better dephosphorization degree, and quicker decarburization rate. The side tuyeres are observable during the whole TBS blowing campaign and the metallurgical technique indexes are improved greatly.