RH循环脱碳过程的数值模拟

Numerical Simulation on Circulation Decarburization in RH

在充分考虑RH平衡碳氧浓度的前提下，以210t超低碳钢RH循环脱碳过程为背景，建立循环脱碳反应的数学模型，详细给出数学模型的建立原则与过程，同时通过改变工况以研究工艺参数对循环脱碳过程的影响，模拟得出以下结论：数学模型与实际测量数据有很好的吻合度。提高初始氧元素质量分数可以提高循环脱碳速率，将初始氧元素质量分数从0．05％提高至0．08％，可以将终点碳元素平均质量分数从0．0024％降低至0．0011％；增加提升气体流量可以提高循环脱碳速率，将提升气体流量从72m3／h增加至120m3／h，可以将终点碳元素平均质量分数从0．0016％降低至0．0011％；增加浸渍管内径可以提高循环脱碳速率，将浸渍管内径从350mm增加至650mm，可以将终点碳元素平均质量分数从0．0044％降低至0．0011％。

A mathematical model is established for circulation decarburization in 210 t RH for ultra- low carbon steel, considering the equilibrium of C and O elements. Principle and process of establishing model is detailed illustrated. Influence on circulation decarburization of parameters is studied through simulation under various working conductions. Results obtained are concluded as follows. The prediction of the mathematical model agrees well with the industrial＇s data. The rate of circulation decarburization can be promoted by increasing initial mass fraction of element oxygen. Under the working conditions of this article, the mass fraction of element oxygen increases from 0. 05% to 0. 08%, the mass fraction of element carbon at the terminal time decreases from 0. 002 4% to 0. 001 1%. The rate of circulation decarburization can be promoted by increasing flux of elevating gas. Under the working conditions of this article, the flux of elevating gas increases from 72 m3/h to 120 m3/h, the mass fraction of element carbon at the terminal time decreases from 0. 001 6% to 0. 001 1%. The rate of circulation decarburization can be promoted by increasing diameter of snorkel of RH. Under the working conditions of this article, the diameter of snorkel of RH increases from 350 mm to 650 mm, the mass fraction of element carbon at the terminal time decreases from 0. 004 4% to 0. 001 1%.