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过程工程学报 ›› 2019, Vol. 19 ›› Issue (6): 1178-1185.DOI: 10.12034/j.issn.1009-606X.219133

• 过程与工艺 • 上一篇    下一篇

废钢对转炉熔池混匀过程的影响

刘 勇1,2， 邓南阳1， 周小宾1,2*， 王多刚3， 彭世恒1,2   

  1. 1. 安徽工业大学冶金工程学院，安徽 马鞍山 243002 2. 冶金减排与资源综合利用教育部重点实验室，安徽 马鞍山 243002 3. 中国钢研科技集团有限公司钢铁研究总院，北京 100081
  • 收稿日期:2019-02-01 修回日期:2019-04-16 出版日期:2019-12-22 发布日期:2019-12-22
  • 通讯作者: 周小宾 zhouxb1943@126.com
  • 基金资助:
    高芳烃高含氮重油催化转化反应基础研究

Influence of steel scrap on the mixing of converter bath

Yong LIU1,2, Nanyang DENG1, Xiaobin ZHOU1,2*, Duogang WANG3, Shiheng PENG1,2   

  1. 1. School of Metallurgical Engineering, Anhui University of Technology, Ma'anshan, Anhui 243002, China 2. Key Laboratory of Metallurgical Emission Reduction & Resources Recycling, Ministry of Education, Ma'anshan, Anhui 243002, China 3. Central Iron and Steel Research Institute, China Iron and Steel Research Institute Group, Beijing 100081, China
  • Received:2019-02-01 Revised:2019-04-16 Online:2019-12-22 Published:2019-12-22
  • Contact: Xiaobin 无ZHOU zhouxb1943@126.com

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摘要： 采用物理模拟研究某炼钢厂250 t转炉冶炼过程中废钢加入量、分布方式和轻重废钢对熔池搅拌混匀的影响。结果表明，轻废钢和重废钢对熔池混匀影响不同，加入轻废钢，熔池混匀时间随废钢量增加而增加，底吹流量为50 L/min时，加入20和60 t废钢熔池混匀时间分别比无废钢时上升48.60%和134.70%。加入重废钢时，废钢在熔池中的分布方式会影响熔池钢液流动，从而影响熔池混匀时间。重废钢在炉底集中分布时，熔池混匀时间随废钢量增加而增加，随底吹气体流量增加而降低。过量底吹气体可能对熔池搅拌有负面影响，底吹流量大于40 L/min时，熔池混匀时间上升。熔池均匀分布时，熔池混匀时间受废钢加入量和底吹气体流量影响。底吹气体流量为25 L/min、重废钢均匀分布时，熔池混匀时间在废钢加入量为40 t和60 t时比20 t时分别降低30.13%和12.93%。废钢倾侧分布时，形成了熔池中非对称搅拌，增加了熔池水平横向流动，一定程度上有利于熔池混匀。相同供气量(25 L/min)下，40 t废钢均匀分布和倾侧分布的混匀时间比集中分布时分别低38.87%和41.01%。

关键词: 物理模拟, 废钢, 底吹流量, 混匀时间

Abstract: The current study focus on the effects of volume, category and distribution of steel scrap on the bath stirring for a 250 t-converter. It was found that the existing of steel scrap influenced the bath stirring during the blowing process. Different bath stirring can be observed when adding light and heavy steel scrap in the bath. Generally, the mixing time increased when the light scrap volume increased in the bath. Comparing to the mixing time without steel scrap addition, the mixing time increased 48.60% and 134.70% when 20 and 60 t steel scrap were added into the bath with the bottom flow rate of 50 L/min, respectively. However, different change trends can be observed when applying heavy steel scrap, which distribution affected the bath stirring, in turn affected the mixing time of the bath. For the heavy steel scrap, the mixing time increased when the scrap volume increased, and decreased when the bottom blowing flow rate increased when the scrap was centralized distributed. Excessive bottom blowing flow rate would react against the decreasing of the mixing time when the flow rate was more than 40 L/min. However, the change trend of mixing time with scrap volume and bottom blowing flow rate changed when the same amount of steel scraps were uniformed distributed. For a uniform distribution of heavy scrap (40 and 60 t) in the bath, the mixing time decreased 30.13% and 12.93% compared to that of adding 20 t steel scraps when the bottom blowing flow rate was 25 L/min. An unsymmetrical flow which accelerated the horizontal flow in the bath can be acquired when the heavy steel scrap was one-side distributed. This was positive to increase the efficiency of the bath stirring. With the same bottom blowing flow rate (25 L/min) and scrap amount (40 t), the mixing time with uniform and one-side distribution of scrap decreased 38.87% and 41.01% compared to centralized distribution of scrap in the bath, respectively.

Key words: Physical simulation, scrap steel, gas supply, mixing time