用流动和传热耦合 CFD-DEM 研究合金的熔化和运动

Yong Liu, Shusen Cheng, Wenxuan Xu
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引用次数: 0

摘要

铁合金的熔化和运动对钢包中钢水的传质和均匀化起着至关重要的作用。合金的传热、熔化和凝固行为会影响其尺寸,从而改变其在气体搅拌钢包内的运动。本研究建立了合金颗粒在高温金属液体中的传热和凝固-熔化模型。计算流体动力学(CFD)方法用于模拟钢包内的流体,离散元素法(DEM)用于模拟合金颗粒。这种耦合方法阐明了钢水中不同类型合金在流动和热交换、颗粒加热、熔化和收缩条件下的运动轨迹。此外,还研究了合金尺寸、合金初始温度、钢水流速和钢水温度对不同类型合金熔化行为的影响。结果表明,随着合金尺寸的增大或钢水流速的减小,熔化时间呈指数增长。此外,合金熔化时间随着合金初始温度或钢水温度的升高而缩短。还评估了这些因素对 FeCr、FeMn、FeSi 和 Al 合金熔化的影响。此外,在钢包中不同位置加入的 FeSi 和 Al 合金在钢水中的停留时间仅为 1 秒,并且没有完全熔化。这些发现表明,铁硅、铝和铁铬合金应添加在对称面的 0.4R 位置。此外,- 0.4R 或 - 0.2R 位置更有利于铁锰的熔化。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Coupled CFD-DEM with Flow and Heat Transfer to Investigate the Melting and Motion of Alloy

Coupled CFD-DEM with Flow and Heat Transfer to Investigate the Melting and Motion of Alloy

The melting and motion of ferroalloys play a crucial role in the mass transfer and homogenization of molten steel in ladles. Heat transfer, melting, and solidification behavior of an alloy affect its size, thereby altering its motion within the gas-stirring ladle. This study established a heat transfer and solidification-melting model for alloy particles in high-temperature metal liquids. The computational fluid dynamics (CFD) method was used to simulate the fluid within the ladle, and the discrete element method (DEM) was employed for the alloy particles. This coupling approach elucidates the motion trajectories of different types of alloys in molten steel under flow and heat exchange, particle heating, melting, and shrinkage conditions. Furthermore, the effects of alloy size, initial alloy temperature, molten steel flow rate, and molten steel temperature on the melting behavior of different types of alloys were investigated. The results showed that the melting time exponentially increased with increasing alloy size or decreasing molten steel flow rate. Moreover, the alloy melting time decreased with increasing initial alloy temperature or molten steel temperature. The impact of these factors on the melting of FeCr, FeMn, FeSi, and Al alloys was also evaluated. Furthermore, FeSi and Al alloys added at different positions in the ladle with symmetric dual gas bottom blowing had a residence time of only 1 second in the molten steel and did not completely melt. These findings indicate that FeSi, Al, and FeCr alloys should be added at the 0.4R position in the symmetrical plane. Furthermore, the − 0.4R or − 0.2R positions are more favorable for the melting of FeMn.

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