【摘要】 应用基于冶金反应工程学和非平衡态热力学对钢液RH精炼脱碳过程提出的新三维数学模型于90tRH装置内的精炼,处理了RH和RH-KTB条件下钢液的脱碳.结果表明,该模型可相当精确地估计RH和RH-KTB精炼中碳和氧浓度的变化;碳和氧浓度分布为钢液流动所左右;钢中碳高于4×10-4(ω)时,KTB操作既可补充脱碳所短缺的氧,使脱碳加速,在更短的时间内达到规定的碳含量水平,也可达到较低的脱碳终点氧含量;对RH和RH-KTB脱碳,都不应忽略上升管内气泡-钢液界面和真空室内液滴群的作用.本工作条件下,对该90tRH装置,以417L/min的吹Ar量即可获得相当好的脱碳效果,进一步增大Ar流量并不能显著改善RH精炼过程的脱碳效果.更多还原

【Abstract】 Using a novel three-dimensional mathematical model proposed and developed for the non-equilibrium decarburization process during the RH refining of molten steel to the refining in a 90 t RH degasser, the decarburization of liquid steel under the conditions of RH and RH-KTB operations was dealt with. The results showed that the changes of [C] and [O] with the treatment time during the RH and RH-KTB refining processes could well precisely be modeled and predicted by the model. The distribution patterns of [C] and [O] were controlled by the flow characteristics of molten steel in the whole degasser. With an initial carbon content in the steel of higher than 4×10-4(ω), the top oxygen blowing operation can not only supply the oxygen lacked for the decarburization process, and accelerate the carbon removal, thus reaching a specified carbon level in a shorter time, but also reach a lower oxygen content at the decarburization endpoint. The decarburization distributions at the gas bubble-molten steel interface in the up-snorkel and the droplets in the vacuum vessel should all not be neglected for the RH and RH-KTB refining processes. For the refining in the 90 t RH degasser, a better effectiveness of decarburization can be reached by use of an Ar blowing rate of 417 L/min, and a further increase in the Ar flowrate cannot evidently raise the efficiency in the RH refining process of liquid steel under the conditions of this present work.更多还原