摘要
通过对真空钢液脱氮的限制性环节进行分析、讨论,结合涟源钢铁公司(以下简称涟钢)的实际生产情况,以确定涟钢RH-MFB脱氮的控制性环节及脱氮模型方程。同时,对影响钢液脱氮的因素进行分析。研究结果表明:涟钢RH脱氮的控制性环节为氮在液相边界层中的扩散,反应为一级反应;在工作真空度(67Pa)下保持必要的钢水循环时间,有助于钢液脱氮;在深脱氧之后,钢液中氧的含量对脱氮的影响较小,而钢液中硫的含量一直比较低,对脱氮的影响不大;钢液中碳含量的急剧下降带动了脱氮反应的进行,表现出的脱氮速率较大,当钢液中碳含量稳定后,钢液内的界面反应和吹氩对脱氮起主要作用。
The controlling links of the RH-MFB denitrogenation and the model equation of the denitrogenation are determined through analysis and discussion on the restrictive steps in the liquid steel denitrogenation by vacuum treatment in consideration of the practical production condition of RH-MFB in Lianyuan Iron ＆ Steel Corporation. In the meanwhile the factors affecting the liquid steel denitrogenation are analyzed as well. Resuits show that the controling steps in RH denitrogenation in Lianyuan Steel are the nitrogen diffusion in the liquid phase boundary layer and the reaction of the diffusion is of the first grade; keeping necessary hot metal recirculation time under the working pressure （67Pa） is helpful to nitrogen removal from the hot metal; after deep deoxidation the effect of the oxygen content on denitrogenation is neglectable and the effect of sulphur on the nitrogen removal is very slight as well since the sulphur content in the liquid steel is very low; the drastic drop down of the carbon content in the liquid steel leads to the acceleration of denitrogenation reaction and as soon as the carbon content in the liquid steel becomes stabilized the boundary reaction in the liquid steel and argon blow will play the leading role in the nitrogen removal process.
出处
《炼钢》
CAS
北大核心
2009年第3期11-15,共5页
Steelmaking
