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本文通过数学模型和实验方法研究了高碳和低碳情况下,CO_2吹入铁碳熔体中的脱碳动力学。提出了气泡中CO分压与铁液中碳含量[％C]的关系和[％C]与CO_2喷吹时间关系的两个数学模型。实验和数模结果表明:在高碳(大约[％C]>2.00)下,[％C]和炉温对CO_2转化率及脱碳速率影响不大,而CO_2流量对脱碳速率影响很大但对CO_2转化率影响很小,其CO_2转化率在99％左右;在低碳(大约[％C]>O.1)下,气泡中CO_2的转化率由[Fe]和[C]的氧化综合决定,但脱碳速率由铁液中[C]传质控制。1823K时,CO_2气体脱[C]达到的最低值为O.011～O.012[％C]。
In this paper, the kinetics of decarbonization of carbon dioxide blowing into iron-carbon melt under high and low carbon conditions was studied by mathematical models and experimental methods. Two mathematical models of the relationship between CO partial pressure in bubble and carbon content in molten iron [% C] and the relationship between [% C] and CO 2 blowing time were proposed. The results of experiments and numerical simulations show that [% C] and furnace temperature have little effect on CO 2 conversion and decarburization rate at high carbon (about [% C]> 2.00), while CO 2 flow has a great influence on decarburization rate But has a little effect on CO 2 conversion, with a CO 2 conversion rate of about 99%. Under low carbon (about [% C]> O.1), the conversion of CO 2 in the air bubbles is controlled by [Fe] and [C] Comprehensive decision, but decarburization rate by the molten iron [C] mass transfer control. At 1823 K, the lowest CO 2 gas removal [C] reached was O.011 ~ O.012 [% C].