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首页> 外文期刊>Transactions of the Indian Institute of Metals >Modeling and Measurements of Intermixing Time in a Water Model of a Four Strand Steelmaking Tundish System
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Modeling and Measurements of Intermixing Time in a Water Model of a Four Strand Steelmaking Tundish System

机译：四流炼钢中间包水模型中混合时间的建模与测量

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Intermixing of two different grades of steel in a 17 tonne, 4 strand bloom casting has been investigated in a ~0.3 scale, geometrically and dynamically similar, isothermal water model tundish system. In this, intermixing phenomena were studied by simulating mixing of flowing water in the tundish, having different dissolved tracer (electrolyte) concentrations. Electrical conductivity measurement technique was employed to monitor concentration of dissolved electrolyte near the strands as a function of time and thereby determine intermixing time. For each experimental condition, three measurements were made and based on such an average intermixing time was estimated. Reproducibility was found to be always within ±15 %. Influence of key operating variables such as, inflow rate from ladle, net outflow rate from tundish, residual liquid volume left over from the previous grade etc. on the duration over which intermixing occurs (referred to as in the text as the intermixing time) was investigated. It was found that any increase in residual volume as well as inflow rate tends to prolong intermixing time. In contrast, influence of outflow rate was quite the opposite. Furthermore, while variation of intermixing time amongstrands was only marginal, tundish interior design (viz., presence of flow modifiers, pouring box etc.) was found to have considerable influence on intermixing lime. Flow phenomena (observed visually through the dispersion of KMnO_4 solution) in the given tundish was found to be practically symmetrical about the transverse centre-line and so was the associated intermixing time. Embodying a large number of experimental data, explicit correlations for intermixing time were derived in terms of principal operating variables through dimensional analysis and regression.
机译：在几何尺寸和动态相似的等温水模型中间包系统中，以〜0.3比例研究了两种不同等级的钢在17吨，4股大方坯铸件中的混合。在此，通过模拟具有不同溶解的示踪剂（电解质）浓度的中间包中流动的水的混合，研究了混合现象。采用电导率测量技术来监测线束附近溶解的电解质的浓度随时间的变化，从而确定混合时间。对于每个实验条件，进行了三个测量，并基于这样的平均混合时间进行了估计。发现重现性始终在±15％之内。关键操作变量（例如，钢包的流入量，中间包的净流出量，上一等级剩余的剩余液体量等）对发生混合的持续时间的影响（在本文中称为混合时间）调查。发现残留体积和流入速率的任何增加都倾向于延长混合时间。相反，流出率的影响则相反。此外，尽管各股之间的混合时间变化仅是很小的，但发现中间包的室内设计（即，存在流动调节剂，浇注箱等）对混合石灰具有相当大的影响。在给定的中间包中，流动现象（通过KMnO_4溶液的分散液目视观察）实际上相对于横向中心线对称，相关的混合时间也是如此。包含大量实验数据，通过尺寸分析和回归，根据主要操作变量得出了混合时间的显式相关性。

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