高废钢比配加直接还原铁冶炼技术实践  

Practice of smelting technology with high scrap ratio and direct-reduced iron

作　　者：杨锦涛 霍琪 李朋[1] 石彪 宿洪建 祖刚 YANG Jintao;HUO Qi;LI Peng;SHI Biao;SU Hongjian;ZU Gang(Tangshan Iron and Steel Group Co.,Ltd.,Tangshan 063000,China)

机构地区：[1]唐山钢铁集团有限责任公司,唐山063000

出　　处：《江西冶金》2024年第6期431-435,共5页Jiangxi Metallurgy

摘　　要：为实现高品质绿色钢铁的开发目标,采用高废钢比技术,在降低长流程钢铁制造过程的碳排放方面开展了系列工作。结果表明,采用空铁包加废钢→高炉出铁→铁水预处理→转炉冶炼→出钢后钢包加废钢的多元化废钢加入方式,废钢比由10%提高至30%以上,为绿色钢铁生产提供了有力保障。在高废钢比条件下,配加直接还原铁小于15t时,吹炼过程控制稳定,转炉终点温度与目标设定温度相差±5℃,终点双命中率(终点碳偏差±0.012%,终点温度偏差±12℃)为90.7%。通过开发高废钢比吹炼模型,提高转炉冶炼过程氧气流量,减少了转炉冶炼前期低温喷溅及废钢熔化滞后进行补吹的频次,转炉终点温度及氧活度符合率为100%。通过提高废钢比及添加直接还原铁等工艺调整,2023年唐山钢铁集团有限责任公司生产1t低合金高强度钢CO_(2)排放量为1.94t,较2022年降低约13%。In order to achieve the development goal of high-quality green steel,a series of measures have been implemented to reduce carbon emissions in the long process steel manufacturing using high scrap ratio technology.The results indicate that scrap ratio has increased from 10%to over 30%through the adoption of the process design involving empty iron ladle plus scrap→blast furnace iron extraction→hot metal pretreatment→converter smelting→post-steel extraction and scrap addition,which provides a strong assurance for green steel production.In the case of a high scrap ratio,with less than 15 t of direct-reduced iron,the blowing process remains stable,with a deviation of±5℃between the converter's end temperature and the target set temperature,and endpoint double hit rate(endpoint carbon deviation±0.012%,endpoint temperature deviation±12℃)of 90.70%.Through the development of a high scrap ratio blowing model,an increase in oxygen flow rate during the converter smelting process has led to a reduction in low-temperature spatter at early stages and post-blowing scrap occurrences.This has resulted in a 100%match between final temperature and converter oxygen activity.Through process adjustments such as increasing the scrap ratio and incorporating direct reduced iron,CO_(2) emissions from the production of 1 t of low-alloyed high-strength steel in Tangshan Iron and Steel Group Co.,Ltd.in 2023 were 1.94 t,a decrease of about 13%compared to 2022.

关 键 词：直接还原铁 高废钢比 碳排放 氧气流量 

分 类 号：TF72[冶金工程—钢铁冶金]