Modeling Slag Behavior When Using Micro‐Bubble Swarms for the Deep Cleaning of Liquid Steel in Tundishes
Modeling Slag Behavior When Using Micro‐Bubble Swarms for the Deep Cleaning of Liquid Steel in Tundishes
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DOI：
10.1002/srin.201600328
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发表时间：
2017-06
影响因子：
2.2
通讯作者：
Sheng Chang;S. Ge;Z. Zou;M. Isac;R. Guthrie
中科院分区：
文献类型：
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作者：
Sheng Chang;S. Ge;Z. Zou;M. Isac;R. Guthrie
通过钢包长水口鼓泡是去除夹杂物的有效方法。然而，钢的暴露眼经常出现在钢包长水口周围的渣盖中，这是由于重新表面化气泡导致形成钢的暴露眼（称为“渣眼”），从而导致热损失和液态钢的再氧化。为了控制气体注入长水口时“渣眼”的形成，采用了一种新型的钢包长水口来产生直径小至0.54 mm的微气泡。水模型的结果表明，减少气泡的大小，在钢包长水口产生的可以有效地限制形成的“渣眼”，提供的气泡是足够小和分散。这使得它们能够穿过顶层的炉渣而不会将其破碎。对于给定的流入速度和护罩配置，形成“渣眼”的临界条件取决于气体流速和穿透上渣层的气泡的个体尺寸之间的平衡。还使用三维CFD模型对渣层行为进行了数值模拟。数值预测与相应的实验结果吻合良好。
Gas bubbling through a ladle shroud can be an effective approach for the removal of inclusions. However, an exposed eye of steel often appears in the slag cover surrounding the ladle shroud, owing to re‐surfacing bubbles leading to the formation of an exposed eye of steel, termed a “slag eye,” resulting in heat losses and re‐oxidation of the liquid steel. In order to control the formation of such a “slag eye” during gas injection into the shroud, a novel ladle shroud is employed to produce micro‐bubbles, as small as 0.54 mm in diameter. The water model results revealed that reducing the sizes of bubbles that are created in the ladle shroud could effectively limit the formation of a “slag eye,” provided the bubbles are sufficiently small and dispersed. This allows them to pass through the top layer of slag without breaking it up. For a given inflow velocity and shroud configuration, the critical condition for forming a “slag eye” depends on a balance between the gas flow rate and the individual sizes of bubbles penetrating the upper slag layer. Slag layer behavior is also simulated numerically, using a three‐dimensional CFD model. Numerical predictions are in good agreement with corresponding experimental results.