Evaluation of Aluminum Dross Generation Rate During Mechanical Stirring of Aluminum Through Model Experiment and Numerical Simulation
Evaluation of Aluminum Dross Generation Rate During Mechanical Stirring of Aluminum Through Model Experiment and Numerical Simulation
复制标题
DOI：
10.1007/s11663-020-01842-8
复制
发表时间：
2020-04
期刊：
影响因子：
--
通讯作者：
Takuya Yamamoto;Kenya Kato;S. Komarov;R. Taniguchi;Yasuo Ishiwata
中科院分区：
文献类型：
--
作者：
Takuya Yamamoto;Kenya Kato;S. Komarov;R. Taniguchi;Yasuo Ishiwata
本研究首次通过水模型实验和数值模拟，提出了一种预测铝液机械搅拌过程中熔炼炉或保温炉铝渣生成速率的评价方法。实验中，采用CO2gas与NaOH溶液之间的气液界面反应作为铝熔体与空气水分之间的反应模型，采用珍珠岩颗粒模拟铝液自由表面的渣渣层。结果表明，反应速率随叶轮转速的增加而增加。此外，反应速率取决于叶轮的旋转方向，但在液体表面有颗粒和没有颗粒的情况下，这种依赖关系是不同的。在第一种情况下，逆时针旋转时的反应速率高于顺时针旋转时的反应速率。另一方面，在第二种情况下，与逆时针旋转情况相比，顺时针叶轮旋转产生了更高的反应速率。这些现象可以用无粒子区气液界面的传质来解释。
The present study proposed, for the first time, an evaluation method to predict the generation rate of aluminum dross in melting or holding furnaces during mechanical stirring of molten aluminum through water model experiments and numerical simulation. In the experiments, a gas–liquid interface reaction between CO2gas and NaOH solution was exploited as a model reaction between the aluminum melt and air moisture, and perlite particles were used to model dross layer on the free surface of liquid aluminum. The results reveal that the reaction rate is increased with the impeller rotation speed. Besides, the reaction rate depends on the impeller rotation direction, but this dependence is different for the cases of presence and absence of particles on the liquid surface. In the first case, the reaction rate at the counter-clock rotation was higher than that at the clock-wise rotation. On the other hand, in the second case, the clock-wise impeller rotation yielded a higher reaction rate compared to the counter-clock rotation case. These phenomena can be explained by the mass transfer across the gas–liquid interface at the particle-free area.