六流连铸中间包钢水流场的数学物理模拟与应用

Mathematical-physical simulation and application of flow field of molten steel in six-strand tundish

应用商业软件CFX及水力学模型,对莱芜钢铁集团有限公司六流连铸中间包钢水流场进行了模拟研究,分析比较了原型中间包和改造后中间包内钢水的流动状态。结果表明:原型中间包内存在明显的短路流,死区比例大,最大达到了68.89%;通过增设"V"字挡墙并扩大湍流抑制器容积后,死区体积比例大大降低,死区比例均控制在20%以内,最低的仅为8.98%,活塞区增大,更有利于夹杂物的去除。通过现场试验发现:中部水口出口与边部水口出口的钢水温差最大值由改造前的8℃减小到3℃;夹杂物总量由改造前的2.2mg/kg减少为1.3mg/kg。

The flow field of molten steel in the six-strand tundish has been researched by commercial software CFX and water simulation.The flow state of the original tundish and the improved one is analyzed and compared with each other.Results show that short circuit flow is found in the original tundish,the volume of dead zone is large and its maximum value reaches 68.89 %.Through building a V type slag dam and enlarging volume of the turbulence inhibitor,the dead volume fraction is largely reduced and ratio of the dead zone is controlled in 20 % and the minimum is only 8.98 %.Expansion of the piston zone is more beneficial to removal of inclusions.It＇s found through on-site experiment that the maximum temperature difference of the liquid steel between the exit of nozzle in the central area and that in the side area is reduced from original 8 ℃ to 3 ℃ and the total inclusions are reduced from 2.2 mg/kg before revamp to 1.3 mg/kg.