Simulation research of inclusive removal by argon blowing stirring during ladle tapping process
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摘要: 针对钢包出钢过程建立了钢液-渣相-气相-氩气泡-夹杂物的五相数学模型，探索了钢包出钢过程中吹氩搅拌去除夹杂物的可行性，以及吹氩流量对流场、渣眼、夹杂物去除效率的影响规律。结果表明：吹氩搅拌可强化浇钢过程中钢液的流动行为，显著提升夹杂物的去除率。相较于未采用吹氩搅拌，当吹氩流量为100 L/min、出钢750 s时，夹杂物的去除率由80.74%提升至96.69%，流入中间包夹杂物的数量减少67.4%；随吹氩流量增加，渣眼尺寸增大，夹杂物去除速率增加，但去除效率变化不大，推荐吹氩流量为100 L/min。Abstract: Based on the process of ladle tapping, a five-phase numerical model including molten steel, molten slag, gas phase, argon bubble and inclusion had been established and used to investigate the feasibility of improving inclusions removal by argon blowing stirring during the tapping process, and the effect of argon blowing rate on flow field, slag-eye, and the removal efficiency of inclusions. The results show that the argon blowing stirring process can strengthen the flow of molten steel and promote the removal of inclusions. Compared with no argon blowing stirring, the removal efficiency of inclusions increases from 80.74% to 96.69% whilst the argon blowing rate is 100 L/min at 750 s, and the number of inclusions flowed into tundish is reduced by 67.4%. The size of slag-eye and the removal rate of inclusions increase with the increase of argon blowing rate, but argon blowing rate has a little effect on the removal efficiency of inclusions. The recommended argon blowing rate is 100 L/min.
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Key words:
- ladle /
- argon blowing stirring /
- numerical simulation /
- multi-phase flow /
- inclusions /
- inclusions removal rate
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图 1 气泡粒径的概率分布和初始夹杂物粒径分布
Figure 1. Probability distribution of bubble diameter and inclusion diameter distribution
图 3 数学模型预测值与Sheng[26]试验测得值的对比
Figure 3. Comparison between the predicted value and the measured value in Sheng’s work experiment
图 6 开浇300 s时沿A-A’方向（z = 1.5 m）钢液速度分布
Figure 6. Velocity distribution along A-A’ direction at 300 s after start casting
图 7 吹氩流量对气泡及渣眼行为的影响
Figure 7. Effect of argon blowing rate on bubble distribution and slag behavior
图 8 吹氩流量对钢包内夹杂物分布的影响
Figure 8. Effect of argon blowing rate on inclusion distribution with various time after start casting
图 10 吹氩流量对夹杂物去除率的影响
Figure 10. Effect of argon blowing rate on inclusions removal rate
表 1 物性参数及计算参数
Table 1. Physical property and calculation conditions
密度/(kg.m−3) 黏度/(Pa·s) 表面张力/(N·m−1) 拉速/(m·min−1) 吹氩流量/(L·min−1) 结晶器尺寸/m 空气 氩气 钢液 渣相 夹杂物 空气 钢液 渣相 钢/渣 钢/气 渣/气 1.225 1.6228 7020 3500 3500 1.79×10−5 0.0055 0.1 1.15 1.82 0.58 1.0 0, 100, 200, 350, 500 0.23×1.6 
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