Li Quanhui, Qin Bangming, Zhang Jiangshan, Dong Hongbiao, Li Ming, Tao Biao, Mao Xinping, Liu Qing
State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, China.
Nanjing Iron & Steel United Co., Ltd., Nanjing 210035, China.
Materials (Basel). 2023 Jan 15;16(2):849. doi: 10.3390/ma16020849.
The flow pattern is vital for the metallurgical performance of continuous casting tundishes. The purpose of this study was to design and optimize the flow characteristics inside a four-strand tundish. Numerical simulations and water model experiments were validated and utilized to investigate the flow behavior. The effect of different flow rates in the original tundish was evaluated; two modified retaining walls and a new ladle shroud were designed for optimization. The molten steel inside the original tundish tends to be more active as the flow rate increases from 3.8 L/min to 6.2 L/min, which results in a reduction in dead volume from 36.47% to 17.59% and better consistency between different outlets. The dead volume and outlet consistency inside the tundish are improved significantly when the modified walls are applied. The proper design of the diversion hole further enhances the plug volume from 6.39% to 13.44% of the tundish by forming an upstream circular flow in the casting zone. In addition, the new trumpet ladle shroud demonstrates an advantage in increasing the response time from 152.5 s to 167.5 s and alleviating the turbulence in the pouring zone, which is beneficial for clean steel production.
流动模式对连铸中间包的冶金性能至关重要。本研究的目的是设计并优化四流中间包内的流动特性。通过数值模拟和水模型实验进行验证并用于研究流动行为。评估了原中间包中不同流速的影响；设计了两种改进的挡墙和一种新型钢包长水口用于优化。当流速从3.8升/分钟增加到6.2升/分钟时，原中间包内的钢水趋于更加活跃，这导致死体积从36.47%减少到17.59%，且不同水口之间的一致性更好。应用改进后的挡墙时，中间包内的死体积和水口一致性得到显著改善。导流孔的合理设计通过在浇注区形成上游环流，进一步将活塞流体积从中间包的6.39%提高到13.44%。此外，新型喇叭形钢包长水口在将响应时间从152.5秒增加到167.5秒以及减轻浇注区湍流方面具有优势，这有利于生产洁净钢。
