利用RTD曲线研究中间包内钢液的流动行为

Flow Behavior of Molten Steel in Tundish Using RTD Curve

建立1∶3的中间包水力学模型,对中间包内钢液流场进行物理模拟,通过软件计算获取流体的活塞区、全混区和死区的体积比例,确定中间包内最优流动行为的方案。试验研究表明,在中间包基本结构流量分别为0.7、0.8、0.9 m^3/h时,其死区比例分别为31.0%、17.3%、15.0%;而挡坝向挡墙方向内移30 mm时,流量分别为0.7、0.8、0.9 m^3/h,其死区比例分别为28%、10.5%、7.5%。因此,提高拉速可以降低中间包内的死区比例;另外,钢包长水口插入深度分别为150、280、315 mm的3组结果表明,插入深度280 mm较为合理,增大或减小插入深度均导致死区比例增大。

A tundish hydraulic model in the proportion of 1：3 was established, the flow field of molten steel in tundish was simulated, and the proportion of the fluid piston area, the mixed area and the dead zone was obtained by calculation of the software to determin the optimal flow behavior in tundish. Experimental research shows that, when flow rate is 0.7, 0.8, 0.9 m3/h, respectively, the corresponding proportion of dead zones is 31.0%, 17.3%, 15.0% in the ttmdish basic structure. When the dam is moved 30 mm in the direction of the retaining wall, similarly the flow rate is 0.7, 0.8, 0.9 m3/h, respectively, the proportion of dead zones is 28%, 10.5%, 7.5%. Therefore, improving drawing speed can reduce the proportion of dead zones in the tundish. In addition, three groups of experimental results, in which the inserting into depth of the ladle long nozzle is 150, 280 and 315 mm, respectively, show that the inserting depth of 280 mm is reasonable, increasing or decreasing insertion depth may result in increasing proportion of dead zones.