张利超, 方庆, 王家辉, 张华, 倪红卫. 底吹氩钢包内废钢熔化行为的数值模拟研究[J]. 工程科学学报. DOI: 10.13374/j.issn2095-9389.2023.05.30.002
引用本文: 张利超, 方庆, 王家辉, 张华, 倪红卫. 底吹氩钢包内废钢熔化行为的数值模拟研究[J]. 工程科学学报. DOI: 10.13374/j.issn2095-9389.2023.05.30.002
Numerical simulation on the melting behaviors of steel scrap in a ladle with bottom argon blowing[J]. Chinese Journal of Engineering. DOI: 10.13374/j.issn2095-9389.2023.05.30.002
Citation: Numerical simulation on the melting behaviors of steel scrap in a ladle with bottom argon blowing[J]. Chinese Journal of Engineering. DOI: 10.13374/j.issn2095-9389.2023.05.30.002

底吹氩钢包内废钢熔化行为的数值模拟研究

Numerical simulation on the melting behaviors of steel scrap in a ladle with bottom argon blowing

  • 摘要: 钢铁行业多消耗废钢不仅有效缓解了我国铁矿石资源紧张问题,而且大幅降低了生产成本以及碳排放对于大气的污染,是低碳冶金的关键一环。现今转炉炼钢工艺因各方面因素限制而消耗废钢量有限,多点加废钢技术应运而生,钢包加废钢逐渐引起冶金专家的重视。本文以某厂70 t钢包为研究对象,采用数值模拟的方法对比了吹氩量对钢包内不同比表面积和预热温度的废钢熔化行为。结果表明:废钢熔化速度随着比表面积的增加而加快;底吹氩气可显著加速废钢熔化,但随着比表面积的增加吹气的促进效果逐步减弱。有底吹氩时,比表面积为120 m2/m3、130.22 m2/m3和160.81 m2/m3的废钢中心温度上升速率相较于无底吹氩时分别提高了7.06 K/s、6.51 K/s和3.73 K/s,熔化速率分别增加了0.92 cm3/ s、0.88 cm3/s和0.28 cm3/s,熔化时间分别缩短了17 s、15 s和3 s。板形废钢初始温度由300 K升到1000 K时,其熔化速度由2.97 cm3/s提高到3.26 cm3/s,熔化时间缩短了3 s。底吹氩流量显著影响废钢熔化速度,当氩气流量由100 L/min增至200 L/min时,比表面积为120 m2/m3、130.22 m2/m3和160.81 m2/m3的废钢熔化时间分别由44 s减小到35 s、42 s减小到34 s及34 s减小到31 s。

     

    Abstract: More steel scrap consumption in iron and steel industry can not only alleviate the shortage of iron ore resources, but also greatly reduce production costs and carbon emissions to the air, which is a key link of low-carbon metallurgy. Due to the limitation of various factors, the consumption of steel scrap in present converter steelmaking process is limited, and the technology of multipoint adding scrap comes into being. The scrap melting behaviors in a 70 t refining ladle under different argon blowing rates with the steel scrap addition of different specific surface area and preheating temperature were numerically investigated and compared in this paper. The results showed that the melting rate of steel scrap increases with the increases of specific surface area, and the bottom argon blowing can obviously accelerate the melting of steel scrap, while the promoting effect gradually decreases as the increase of specific area. With bottom argon blowing, the core temperature of steel scrap with specific surface area of 120 m2/m3, 130.22 m2/m3 and 160.81 m2/m3 increased by 7.06 K/s, 6.51 K/s and 3.73 K/s, the melting rate was increased by 0.92 cm3/s, 0.88 cm3/s and 0.28 cm3/s, and the melting time was shortened by 17 s, 15 s and 3 s, respectively, compared with that without bottom blowing. When the initial temperature of steel scrap rises from 300 K to 1000 K, the melting rate increases from 2.97 cm2/s to 3.26 cm2/s, and the melting time is shortened by 3 s accordingly. The argon blowing rate significantly affects the melting rate of steel scrap. When the argon blowing rate increases from 100 L/min to 200 L/min, the melting time of steel scrap with specific surface area of 120 m2/m3, 130.22 m2/m3 and 160.81 m2/m3 is reduced from 44 s to 35 s, 42 s to 34 s and 34 s to 31 s, respectively. Therefore, on the premise of smooth production, the melting speed of steel scrap in ladle can be significantly accelerated by increasing the argon blowing rate and adding the slab scrap with higher initial temperature and specific surface area. The present study can provide certain theoretical guidance for the development of scrap rapid melting in ladle in steel plants.

     

/

返回文章
返回