Improvement on the Mixing Effect in Low-intensity Stirring Area for CAS Ladle by Double-nozzles Bottom Blowing Technology
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摘要: 按照1:5相似比建立CAS钢包模型,通过片光源拍照观察流场和电导率仪测定混匀时间,研究双底吹技术对CAS钢包内弱搅拌区混匀特性的改善情况。结果表明双底吹技术能较大程度降低钢包混匀时间,改善弱搅拌区的流场特点,提高钢包中下部的混匀效果。通过无因次分析,得出辅吹气流量Q和浸罩插入深度H对混匀时间影响程度的经验公式: $\frac{\tau-\tau_0}{\tau_0}=0.59 Q^{-0.74}\left(\frac{H}{H_L}\right)^{0.52}$。Abstract: Based on a water model with the size of one fifth of the real CAS ladle,the improvement of the mixing effect in CAS-OB process using double-nozzles bottom blowing technology was researched by analyzing the flow field and determining the mixing time.Results show that double-nozzles bottom blowing technology could greatly reduce the mixing time,also could change the flow field in the low-intensity stirring area of ladle and improve the mixing effect in the middle and lower part of ladle.The experimental formula for expressing the effect of bottom blowing flow rate Q and depth of inserting snorkel H on mixing time $\frac{\tau-\tau_0}{\tau_0}=0.59 Q^{-0.74}\left(\frac{H}{H_L}\right)^{0.52}$ is obtained by free factors analysis.
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Key words:
- CAS-OB /
- double-nozzles bottom blowing /
- flow field /
- refining process /
- water modeling
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