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Effect of Snorkel Shape on Refining Efficiency of RH Treatment

机译：浮潜形状对RH处理精炼效率的影响

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The improvement of the steel cleanliness is a vital issue to produce high quality steels. The RH (Ruhrstahl-Heraeus) refining process is a high efficiency metallurgical reactor owing to its vacuum treatment and gas stirring effect, which was widely used to manufacture the ultra-carbon steel, such as IF (Interstitial-Free) steel. The finial purpose of those research is to improve the refining efficiency of the RH treatment involved the decarburization effect and the inclusions removal effect. In recent years, some new ideas and designs of RH snorkels have been reported such as using oval snorkels, using one single snorkel and using two asymmetric snorkels based on their actual plant conditions. The numerical simulation method provides a quick and easy way to realize the visualization of the interior transport phenomena, benefiting to understand and research on the high temperature experiments. A lot of investigations focus on improving the recirculation rate to enhance the decarburization rate and increase the inclusions removal efficiency. In the current study, three types of RH reactors with different shapes of snorkels (the round up-leg and down-leg, the oval up-leg and oval down-leg and the round up-leg and oval down-leg) were compared by the combined mathematical model and industrial experiments. The minor axis of the oval snorkel is equal to the diameter of the round snorkel, so that the cross area of the oval snorkel is larger than the round snorkel. The fluid flow and the recirculation rate were simulated using the coupled VOF+DPM model, and the inclusions evolution of the actual molten steel was analyzed by the Aspex (Application Specific Products employing Electron Beam and X-ray technology) method.
机译：钢清洁度的改善是生产高质量钢的重要问题。由于其真空处理和气体搅拌效果，RH（Ruhrstahl-heraeus）精炼过程是一种高效的冶金反应堆，该反应器被广泛用于制造超碳钢，例如（无纺电筒）钢。这些研究的细节目的是提高RH治疗的精炼效率涉及脱碳效果和夹杂物去除效果。近年来，已经报道了一些新的思路和设计，例如使用椭圆形呼吸管，使用一个呼吸管，并根据实际植物条件使用两个不对称气管。数值模拟方法提供了一种快速简便的方法来实现内部传输现象的可视化，有益于了解和研究高温实验。大量的调查重点是提高再循环率，以提高脱碳率，增加夹杂物清除效率。在目前的研究中，比较了三种类型的呼吸器（圆形腿部和下腿，椭圆形上腿和椭圆形凹槽和圆形腿部）的三种类型的RH反应器进行了比较通过组合数学模型和工业实验。椭圆形浮潜的短轴等于圆形浮潜的直径，使得椭圆形浮潜的横向面积大于圆形气管。使用耦合的VOF + DPM模型模拟流体流动和再循环速率，通过ASPEX（采用电子束和X射线技术的应用特定产品）方法分析了实际钢水的夹杂物演化。

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