五机五流非对称连铸机中间包流场流动特性研究

Study on flow field characteristics of tundish of five-machine and five-strand unsymmetrical continuous caster

通过对原型中间包的三维模拟构造,根据相似原理利用水来模拟钢液借助水模型物理模拟和ANSYS Fluent有限元计算软件的数值模拟手段,提出中间包钢液流动行为的优化方案,逐步应用于现场实际生产并达到工艺和操作稳定化。验证结果表明:优化后的中间包平均停留时间显著延长,最高达到467.47 s,死区比例最低降至22.22%,RTD曲线由陡峭、分散转变为平缓、一致。多流之间实际测量温度差异<2℃。钢液的全氧含量下降明显,由13.0 ppm降至8.1 ppm,降幅高达37.7%。夹杂物>10 um去除能力显著提高,去除率由原型中包的78.23%提高至95.33%。各流一致性、钢水纯净度得到了明显改善。

Based on the 3D simulation structure of the prototype tundish,the water is used to simulate the molten steel according to the similar principle by means of the physical simulation of the water model and the numerical simulation means of the ANSYS Fluent finite element calculation software,the optimization scheme of molten steel flow behavior in tundish is put forward,which is gradually applied to actual production and achieved process and operation stabilization.The results show that the optimized tundish's average residence time is prolonged to 467.47 s and the ratio of dead zone is reduced to 22.22%.The RTD curve changes from steep and dispersive to smooth and consistent.The actual measured temperature difference between multi-flow is<2℃.The content of total oxygen in molten steel decreased obviously from 13.0 ppm to 8.1 ppm,a decrease of 37.7%.The removal rate of inclusion greater than 10um increased from 78.23% to 95.33%.The consistency of each flow and the purity of molten steel were improved obviously.