Analysis of Droplet Generation in Oxygen Steelmaking
Analysis of Droplet Generation in Oxygen Steelmaking
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DOI：
10.2355/isijinternational.49.24
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发表时间：
2009-01
影响因子：
1.8
通讯作者：
N. Dogan;G. Brooks;M. Rhamdhani
中科院分区：
文献类型：
--
作者：
N. Dogan;G. Brooks;M. Rhamdhani
吹氧过程中液滴生成的知识，可以用吹数（NB）来表征，对于更好地理解氧气炼钢动力学的基本原理至关重要。利用Holappa和Jalkanen的研究数据，建立了一个考虑表面张力对吹炼次数（NB）影响的数学模型。该模型预测了熔滴的形成作为金属中的碳、硫和氧含量、金属浴的温度分布和喷枪高度的函数。这项研究包括一个敏感性分析，以调查在整个过程中的氧浓度的变化的影响。已经发现，液滴产生的速率随着到金属浴上的射流动量的增加和随着液体金属的表面张力的减小而增加。该模型还表明，通常在液浴中的氧和硫的含量的变化有相对较小的影响，对液滴生成相比，吹炼参数的效果。然而，在低碳钢（<0.05质量% C）的情况下，由于表面张力的降低，在吹炼结束时吹炼次数增加超过50%。
Knowledge of droplet generation during oxygen blowing, which can be characterized by a blowing number (NB), is crucial for better understanding of the fundamentals of the kinetics of oxygen steelmaking. A mathematical model has been developed considering the influence of surface tension on the blowing number (NB) using plant data from the study of Holappa and Jalkanen. The model predicts the droplet formation as a function of carbon, sulphur and oxygen contents in the metal, the temperature profile of the metal bath and lance height. This study includes a sensitivity analysis to investigate the effect of the changes in the oxygen concentration throughout the process. It has been found that the rate of droplet generation increases with increasing jet momentum onto the metal bath and with decreasing surface tension of the liquid metal. The model also suggests that generally the variation in oxygen and sulphur contents in liquid bath has relatively little influence on droplet generation compared to the effect of blowing parameters. However, in the case of low carbon steels (<0.05 mass% C), the blowing number increases by more than 50% at the end of the blow due to lowering of surface tension.