【作者】 丁建国； 程树森； 成国光；

【Author】 Ding Jianguo, Cheng Shusen, Cheng Guoguang(School of Metallurgy and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083,China;Changzhi Iron and Steel Co.Ltd., Beijing 100022, China)

【机构】 北京科技大学冶金与生态学院；

【摘要】 通过中间包底吹气产生的气幕代替挡墙可以减少外来夹杂物,达到清洗钢液的目的。采用了冶金多相流过程中通用的k-ε双方程模型,模拟了单水口中间包浇铸过程中,从中间包底部横向吹入氩气后,在中间包内的钢水流动状态。结果表明:中间包横向吹气可以在中间包内形成带状的气幕挡墙,清洗通过的钢液。导流杯与底部吹气的结合可以增强混合,获得复杂的循环流动,具有水平和垂直的混合流动过程,迂回的流向出口。随着气体流量的增大,气体体积分数云图由“柱状形”逐渐过渡到“伞状形”,可能导致钢液表面卷渣。增大吹气量可以减少活塞流区,增大全混流区。更多还原

【Abstract】 Using gas curtain wall can reduce extra inclusions and clean molten steel. In this paper, flow of steel in a one-strand slab tundish equipped with a transversal gas bubbling curtain during the casting process was simulated by k-ε model with numerical simulations. The simulation result shows that gas injection from tundish bottom can form zonal gas curtain in tundish, which will accelerate mix. A combination of a TI with gas bubbling swell mixture and gain complex recirculating flows of liquid with horizontal mixing processes that originate bypassing streams toward the outlet. Gas volume fraction distributions figure in tundish change from "columner shape" to "umbrella shape" with higher gas flow rates, and this shape may induce wrapping slag. Increasing flow rates of gas leads to decreases of plug flow fraction of the fluid inside the tundish and increase of the mixing fraction of the liquid phase.更多还原