120 t转炉高强度长寿命顶底复吹工艺优化及实践

Optimization and Practice on Top and Bottom Combined Blowing Process of 120 t Converter with High Strength and Long Life Time

针对120 t转炉高强度长寿命顶底复吹关键技术,在应用过程中存在炉底和底吹元件维护难度大、渣线和倒渣面损伤大、冶炼周期长等问题,开展技术研究及工艺优化。研究和优化结果表明:采用高强度长寿命顶底复吹关键技术并对顶枪同步优化和炉底维护技术改进后,120 t转炉顶底复吹同步炉龄达17182炉,创公司同步复吹历史纪录。采用该新技术后,在钢水平均终点[C]保持一致的情况下,终点钢水[C].[O]降低0.0017,终点钢水终点[Mn]提高0.02%,平均终渣(TFe)降低2.25%,渣料消耗降低4.00 kg/t,冶炼周期缩短42 s,达到了预期的复吹效果。

The technical research and process optimization was developed for the critial technologies of top and bottom combined blowing process of 120 t converter with high strength and long life time,especially for the problems of maintenance difficulties of furnace bottom and bottom blowing elements,big damage to the slag line and deslagging area,long smelting period and so on.The research and optimization results show:after adoption of critical technologies of top and bottom combined blowing process with high strength and long life time,for simultaneous optimization and improvement of maintenance technologies of furnace bottom,the synchronous furnace life of top and bottom combined blowing process of 120 t converter can reach to 17182 melt,it create the company's historic records of synchronous combined blowing.After adoption of the new technology,under the circumstance of the average end point of molten steel[C]remains consistent,the molten steel end point[C].[O]is decreased by 0.0017,the molten steel end point[Mn]is increased by 0.02%,the average final slag(TFe)is decreased by 2.25%,the consumption of slag material is decreased by 4.00 kg/t,the smelting period is shorten by 42 s,the prospective combined blowing effect is reached.