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首页> 外文期刊>Steel Research International >Numerical Simulation of Fluid Flow in Bath during Combined Top and Bottom Blowing VOD Refining Process of Stainless Steel
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Numerical Simulation of Fluid Flow in Bath during Combined Top and Bottom Blowing VOD Refining Process of Stainless Steel

机译：不锈钢顶吹和底吹VOD联合精炼过程中熔池内流体流动的数值模拟

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摘要

The fluid flow in a bath in combined top and bottom blowing vacuum-oxygen decarburization (VOD) refining process of stainless steel has numerically been simulated. The three-dimensional mathematical model used is essentially based on that proposed in our previous work for the flow in combined side and top blowing argon-oxygen decarburization (AOD) process, but considering the influence of reduced ambient pressure. Applying it to the flow in the bath of a 120t VOD vessel under the refining conditions, the results present that the model can fairly well simulate and estimate the flow phenomena. The flow pattern of molten steel in the bath with the combined blowing is a composite result under the common action of the jets from a three-hole Laval top lance and gas bottom blowing streams. The jets have a leading role on it; the molten steel in the whole bath is in vigorous stirring and circulatory motion during the blowing process. The streams do not alter the basic features of the gas agitation and liquid flow, but can evidently change the local flow pattern of the liquid and increase its turbulent kinetic energy to a certain extent. The flow field and turbulent kinetic energy distribution in the combined blowing with three tuyeres are more uniform than those in the blowing with double tuyeres. Increasing properly the tuyere eccentricities is of advantage for improving the velocity and turbulent kinetic energy distributions, the stirring and mixing result in the practical VOD refining process.
机译：数值模拟了顶部和底部吹气-氧气脱碳（VOD）组合精炼工艺中熔池中的流体流动。所使用的三维数学模型基本上是基于我们先前工作中提出的侧吹和顶吹氩氧脱碳（AOD）组合流程中的流量，但考虑了降低的环境压力的影响。将其应用于精炼条件下的120吨VOD容器浴池中的流动，结果表明该模型可以很好地模拟和估计流动现象。在三孔拉瓦尔顶喷枪和气体底吹流的射流共同作用下，钢水在熔池中的混合喷流是一种综合结果。喷气机在这方面起着领导作用;整个熔池中的钢水在吹炼过程中处于剧烈搅拌和循环运动中。这些流不会改变气体搅动和液体流动的基本特征，但是可以明显改变液体的局部流动模式，并在一定程度上增加其湍动能。与三个风口联合吹制的流场和湍动能分布比双风口联合吹制的流场和湍动能分布更均匀。适当地增加风口偏心率对于改善速度和湍动能分布是有利的，搅拌和混合导致了实际的VOD精制过程。

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