摘要:
根据某厂实际中间包的操作工艺参数,采用欧拉两流体模型以及多孔介质模型,用数值模拟法研究了同时采用湍流控制器和气幕挡墙技术,中间包内气幕挡墙的位置及吹气量对中间包内钢液流动特性的影响。结果表明,采用气幕挡墙技术,吹气量及吹气位置对钢液流场及RTD曲线影响较大,吹气位置靠近入口或出口都不利于中间包钢液流动特性的改善,吹气量太大易引起表面卷渣现象,吹气量太小,不能形成有效的气幕挡墙。气幕挡墙距离入口1 200~2 000 mm,且吹气量为0.90 m3/h时,可以有效延长钢液的停留时间,减小死区体积,有利于夹杂物的上浮去除。
Abstract:
According to the structure and the tundish operating parameters of a production plant,the flow charecteristics of steel in the tundish with turbulence inhibitor and gas curtain technique was researched by numerical simulation method.Eulerian-multiphase model and porous media model were applied in the research.The effect of gas curtain position and gas flow rate on the flow characteristics of steel in the tundish was investigated.The results indicate that the position of gas blowing and gas flow rate has remarkable effect on the steel fluid flow and RTD curve.It is disadvantageous to the steel fluid flow if the position of gas blowing is near the inlet or outlet.There is an optimum range for the gas flow rate,too large is liable induce slag rolling but too small is disadvantage to forming gas curtain.When the distance of gas blowing position from the inlet is 1 200~2 000 mm meanwhtile the gas flow rate is 0.90 m3/h,the residence time of fluid in tundish will be effectively prolonged and the dead zone volume will be decreased,and so accelerate the removal of inclusions.
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