单流板坯连铸中间包内钢液流动特性研究

Study on Flow Characteristics of the Molten Steel and Optimization of Flow Control Device in a Single-Strand Slab Caster Tundish

以八钢30t单流板坯连铸中间包为研究对象,采用物理和数学模拟方法,研究了中间包内钢液停留时间分布,分析了呈双峰形状的停留时间分布曲线反映的钢液流动模式,并采用新的方法计算了包含短路流的钢液流动模式的特征参数,进一步阐述了中间包内钢液流动特性。得出结论:(1)中间包内钢液流动的停留时间分布曲线呈现双峰形状,主要原因是中间包内钢液存在一定程度的短路流(2)中间包底面宽长比是控制中间包内钢液短路流的最主要因素,当中间包底面宽长比为0.30时,中间包内钢液短路流完全消失。

The thesis makes research on a30tons single-strand slab continuous caster tundish of Bayi steel.The physical and mathematical simulation methods are currently being used successfully to obtain and analyze the residence time distribution(RTD)curve,especially the RTD curve with double peaks which reflect the flow mode of the molten steel in tundish.On this basis,a new method to characterize the melt flow in tundish was presented according to the mixed model.The key issues can be summarized as follows:(1)the research found that appearance of double peaks in the RTD curves indicates that short-circuiting flow phenomena appeared in the tundish fluid flow system.(2)In this research,the ratio of width to length(W/L)in tundish is a key factor to control the short-circuiting flow in the tundish fluid flow system.When the ratio of(W/L)in tundish is0.30,the short-circuiting flow in tundish disappeared completely,the RTD curve shows a single peak completely.