大方坯六流中间包少流浇注时钢液的流动行为

在连铸过程中,由于钢水不足或设备故障,为适应生产节奏,关闭多流中间包单个或多个水口是常见操作。然而,水口的关闭会导致中间包流场发生变化,并进一步影响到中间包内夹杂物的去除效率。为此,针对某钢厂重轨钢用大方坯六流中间包,应用数值模拟的研究方法对关闭不同单个水口时中间包内的钢液流动行为以及夹杂物去除情况进行了研究,得出了最佳关停水口方案,为中间包水口关停的选择提供了必要依据。研究结果表明,当中间包关掉任意一流浇注时,中间包内的死区体积均会略微上升;关闭第一流对于中间包内夹杂物的去除的影响最小,此时10、30、50、70、90 μm的夹杂物去除率分别由正常浇注时的12.4%、39.1%、74.2%、93.3%、95.6%变为14.7%、36.4%、76.4%、85.3%、93.8%。

Flow behavior of molten steel during fewer strands casting of six-strand bloom

In continuous casting, it is common to close single or multiple nozzle of multi-strands tundish in order to adapt to production rhythm due to insufficient molten steel or equipment failure. However, the closure of the nozzle will change the flow field in the tundish and further affect the removal efficiency of inclusions in the tundish. For this reason, based on numerical simulation, the flow behavior of molten steel and the removal of inclusion in tundish with different nozzle closed were studied, and the optimal nozzle closing scheme was obtained, which provided a basis for the selection of nozzle closing in tundish. The results show that the volume of dead zone in tundish increases slightly when the first casting is turned off, and the effect of turning off the first casting on the removal of inclusion in tundish is minimal. The removal rates of 10, 30, 50, 70 and 90 μm inclusions changed from 12.4%, 39.1%, 74.2%, 93.3% and 95.6% to 14.7%, 36.4%, 76.4%, 85.3% and 93.8%, respectively.