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首页> 外文期刊>ISIJ international >Numerical Investigation on Role of Bottom Gas Stirring in Controlling Thermal Stratification in Steel Ladles
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Numerical Investigation on Role of Bottom Gas Stirring in Controlling Thermal Stratification in Steel Ladles

机译：底部气体搅拌在钢包热分层控制中作用的数值研究

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摘要

A two dimensional Computational Fluid Dynamics (CFD) model was developed to simulate the fluid flow and heat transfer of the molten steel in a ladle during the holding time, with gas purging from the bottom. Transient analysis of the temperature and the velocity distribution of the liquid steel during ladle standing and subsequent gas stirring was conducted, by employing a pressure-based fully-implicit finite volume approach. Stratification, which can adversely affect the quality of steel products, was seen to develop due to natural convection. Therefore, particular attention was paid to study the effect of bottom gas stirring in minimizing the thermal stratification. This was accomplished by introducing a novel approach of coupling the effects of natural convection and axisymmetric bottom gas injection. Various parametric studies was undertaken to examine the effects of standing time, gas flow rate and geometry of the ladle on the resultant thermal field. It was observed that bottom purging situation induces a strong recirculatory flow in the molten steel bath, with an increase in the order of turbulence giving rise to thermal homogenization. The results indicate that the thermal stratification can be effectively eliminated by a relatively gentle agitation. Homogenization takes place at a faster rate with an increase in the amount of bottom gas flow. The effect of ladle size was found to be inconsequential, in comparison to other parameters.
机译：建立了二维计算流体动力学（CFD）模型，以模拟钢水在保温时间内钢水在钢包中的流动和传热，同时从底部吹扫气体。通过采用基于压力的完全隐式有限体积方法，对钢包静置及随后的气体搅拌过程中钢水的温度和速度分布进行了瞬态分析。由于自然对流，可以对钢产品的质量产生不利影响的分层逐渐形成。因此，要特别注意研究底部气体搅拌在最小化热分层方面的作用。这是通过引入一种将自然对流和轴对称底部气体注入效果耦合的新颖方法来实现的。进行了各种参数研究，以检验静置时间，气体流量和钢包几何形状对所得热场的影响。观察到底部吹扫的情况在钢水浴中引起强烈的再循环流，湍流阶数的增加导致热均质化。结果表明，通过相对温和的搅拌可以有效地消除热分层。均质化随着底部气体流量的增加而以更快的速度发生。与其他参数相比，发现钢包尺寸的影响无关紧要。

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