钢液/（N2、H2）过饱和体系中气泡生长的数值分析

采用水/CO2体系模拟研究钢液/( N2、H2)过饱和体系中气泡生长动力学行为，分别建立水溶液和钢液中气泡形核长大机理模型。基于三种不同的气泡生长数学模型，分别研究水/CO2和钢液/( N2、H2)体系数学模型中气泡生长动力学，并采用水模型实验数据对数学模型进行验证。分析钢液/( N2、H2)体系前期和后期处理压力以及钢液深度等因素对气泡生长的影响。研究表明：采用气泡浮选去除夹杂物技术时，前期处理压力对气泡生长有显著促进作用；后期处理压力对气泡生长有阻碍作用，随着后期处理压力的升高影响逐渐加强；钢液深度对气泡生长有阻碍作用，随着钢液深度的增加影响逐渐减弱；相比氮气，钢液中氢气气泡析出长大更快。

Numerical analysis of bubble growth in a molten steel/(N2,H2) supersaturation system

A water/carbon dioxide system was used to study bubble growth dynamics in a molten steel/( N2 ,H2 ) supersaturation system. Bubble nucleation and growth mechanism models in the aqueous solution and the molten steel were respectively established. Bubble growth dynamics in the water/carbon dioxide system and the molten steel/( N2 ,H2 ) system was studied based on three different kinds of bubble growth mathematical models. Water modeling experimental data were used to validate the mathematical models. The influences of preprocessing pressure, post-processing pressure and the depth of molten steel on bubble growth were analyzed in the molten steel/( N2 ,H2 ) system. It is found that when using the technology of inclusion removal by bubble flotation, preprocessing pres-sure has significant effect on the bubble growth. However, post-processing pressure blocks the bubble growth, and with increasing post-processing pressure, the influence gradually strengthens. The depth of molten steel has retarding effect on the bubble growth, and with the increasing of the depth of molten steel, the influence gradually weakens. Compared with nitrogen bubbles, hydrogen bubbles in molten steel grow faster.