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Mathematical Model for Decarburization Process in RH Refining Process

机译：RH精炼过程中脱碳过程的数学模型

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摘要

A three-dimensional mathematical model for natural decarburization process of ultra-low carbon Al killed steel during RH refining has been established. The decarburization behavior in RH degasser was discussed on the basis of a comparison between simulation data and the actual plant trials ones. The effects of the different initial carbon content, initial oxygen content, the lift gas rate and inside diameter on decarburization were investigated. The results showed that when the dissolved oxygen concentration was 0.08% in the molten steel, the flow rate of gas injected through the up-leg was 120 Nm~(3)/h, the inside diameter of up and down-leg was 650 mm, under these conditions, the initial carbon content was 0.03%, 0.023% and 0.015%, respectively, after about 25 minute, the average carbon content in molten steel was 0.011%, 0.01% and 0.0008%. The final dissolved carbon content is related to the initial dissolved oxygen content in molten steel. The average carbon concentration and the decarburization rate of the molten steel will decrease with the increasing of the initial dissolved oxygen content. The effects of different inside diameter of up and down-leg were also compared, it shows that the increasing of the diameter of up/down-leg will promote decarburization effectively, which can increase the circulation flow rate and promote the reaction rate.
机译：建立了RH精炼过程中超低碳铝镇静钢自然脱碳过程的三维数学模型。在模拟数据与实际工厂试验数据进行比较的基础上，讨论了RH脱气机中的脱碳行为。研究了不同的初始碳含量，初始氧含量，提升气体速率和内径对脱碳的影响。结果表明，当钢水中溶解氧浓度为0.08％时，通过上支腿注入的气体流量为12​​0 Nm〜（3）/ h，上，下支腿的内径为650 mm在这些条件下，初始碳含量分别为0.03％，0.023％和0.015％，约25分钟后，钢水中的平均碳含量为0.011％，0.01％和0.0008％。最终的溶解碳含量与钢水中的初始溶解氧含量有关。钢水的平均碳浓度和脱碳率会随着初始溶解氧含量的增加而降低。比较了上下支管不同内径的影响，表明增大上下支管的直径可以有效地促进脱碳，从而可以增加循环流量，提高反应速度。

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