摘要：
By establishing a two-phase gas-liquid flow mathematical model that simulates the bottom argon blowing process in tundish,the effects of the flow control device configuration and argon blowing rate on the flow behavior and average residence time of molten steel in tundish were studied;meanwhile,the water model test was carried out to verify the relialibity of numerical simulation.By comparison with the physical simulation results,the feasiblity of the established mathematical model has been testified.The numerical simulation results show that when the weir,dam and permeable brick are all adopted in the tundish,the best position of permeable brick is 570 mm away from the stopper rod,and the corresponding average residence time of molten steel is 8.74 min at the argon blowing rate of 31.26 L/min.What's more,the application of permeable brick for argon blowing instead of the weir or dam is beneficial to prolonging the average residence time of molten steel in tundish,and the corresponding average residence time tends to decrease with the increase of argon blowing rate.Compared with the combination of dam and permeable brick in tundish,the configuration of weir and permeable brick turns out to be more conductive to improving the cleanness of molten steel.In this case,the optimal argon blowing rate is 20.84 L/min,and the corresponding average residence time of molten steel in tundish is 8.77 min.%建立模拟中间包底吹氩过程的气-液两相流数学模型,研究了控流装置的布置方式、吹氩量对中间包内钢液流动行为和钢液平均停留时间的影响,并利用水模型试验对数值模拟的准确性进行了验证.与相同条件下的物理模拟结果对比可知,利用所建数学模型模拟计算中间包内钢液流动行为是可行的.数值模拟结果表明,在中间包内设置挡墙、挡坝和透气砖时,最佳的透气砖位置是距塞棒570 mm,氩气流量为31.26 L/min,此时钢液平均停留时间为8.74 min;利用透气砖代替挡坝和挡墙均延长了中间包内钢液的平均停留时间,且随着吹氩量的增大,钢液平均停留时间大致呈减少趋势;对比透气砖和挡坝组合,采用透气砖和挡墙组合更利于提高钢液的纯净度,此时较优的吹氩量为20.84 L/min,相应的中间包内钢液平均停留时间为8.77 min.
