多流式连铸过渡包的结构优化

Structure optimization of multi-strand transition piece

过渡包在薄带连铸过程中起到承上启下的作用,为了使结晶器入口钢液成分与温度更加均一,研究钢液在过渡包内的流动以及其出口钢液温度的分布对薄带连铸过程有着重要的意义。针对某钢厂多流式过渡包,提出在包内增加坝堰组合以优化钢液在包内的流态以及温度分布。采用数值模拟和物理模拟的方法,研究了过渡包内不同控流装置下钢液的流态和温度分布,同时通过各流出口的平均停留时间和温度值差来考察钢液分布的均匀性。研究发现增加坝堰组合后,过渡包内流态与温度分布更加均一且稳定,过渡包内设置坝高30 mm,堰高30 mm,坝堰间距120 mm,堰距入口中心距离253 mm为最优方案,其平均停留时间方差较原模型减少82%,各出口温度极差较原模型减少67%。数值模拟结果同物理模拟结果较一致。

The transition piece is an intermediate metallurgical reactor that connects the tundish to the mold in the thin strip casting process. The study of the flow of molten steel in the transition piece and the temperature distribution at outlet is of great importance for the thin strip continuous casting process. For a multi-strand transition piece, it was proposed to add the dam and weir combination to optimize the flow pattern and temperature distribution of molten steel in the transition piece. The numerical simulation and physical simulation methods were adopted to study the flow pattern and temperature distribution of molten steel under the different flow control devices in the transition piece. The uniformity of molten steel was investigated by the average residence time and temperature at each outlet. The results show that the dam and weir combination can stabilize and unify the flow and temperature distribution of molten steel in the transition piece, and the optimal scheme is that the height of dam is 30 mm, the height of weir is 30 mm, the distance between dam and weir is 120 mm, and the distance between weir and nozzle is 253 mm, and its average residence time variance is 82% less than that of the original model;the temperature range in the outlet is 67% lower than that of the original model. The numerical simulation results are in good agreement with the physical simulation results.