Numerical study on the effect of high efficient cooling nozzles and varying cooling intensity on metallurgical transport behaviors during the slab continuous casting

Cheng Yao, Min Wang, Youjin Ni, Jian Gong, Zeyu Yang, Lidong Xing, Yanping Bao
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Abstract

In this study, the spray characteristics of the cooling water flux of the traditional single nozzle and novel dual nozzle were innovatively and effectively incorporated into a 3D/2D flow-temperature-concentration segmented model. The model was used to investigate the effects of spray characteristics on the flow, heat distribution, solute transport, solidified shell, and mushy zone of steel in the continuous casting. The results showed that various flow patterns of liquid steel in the turbulent zone significantly affected the temperature and carbon concentration distribution. Until Zone 7, the cooling water fluxes in the six cases remained unchanged. The peak temperatures of cases 1 and 4 in Zone 7 were 1253.11 and 1273.51 K, respectively, indicating that the spray characteristic was the primary cause of the variations in slab surface temperatures. The cooling water fluxes in the six cases change from Zone 8 onward. The six cases had differences of −21.39, 17.87, 46.95, −22.08, 16.86, and 45.68 K between the initial and final temperatures in Zone 8, respectively, meeting the requirement of keeping the maximum temperature recovery rate of slab surface under 100 °C/m. However, the final temperatures for cases 2, 3, and 6 were 1225.62, 1196.50, and 1218.91 K, respectively. These temperatures fall within a realistic plastic temperature range, which must be higher than 1220 K. As a result, the plastic cracking in the slab was possible. The maximum temperature gradient differences of the six cases between feature lines at the end of Zone 8 were 0.793, 0.814, 0.829, 0.185, 0.179, and 0.179 K/mm. These results showed that the optimization effect on the temperature gradient difference was insignificant as the cooling intensity rose. However, the carbon concentration uniformity was marginally improved by increasing the cooling water flux. Finally, a state-owned steel company in China chose case 5 (dual nozzle with moderate cooling intensity at the slab solidified end) as the optimum option for the slab continuous casting caster. The dual nozzle enhanced and promoted the efficient and homogeneous production of the metallurgical process.
板坯连铸过程中高效冷却喷嘴和不同冷却强度对冶金传输行为影响的数值研究
本研究创新性地将传统单喷嘴和新型双喷嘴冷却水流量的喷雾特性有效地纳入到三维/二维流动-温度-浓度分段模型中。该模型用于研究喷雾特性对连铸中钢水的流动、热分布、溶质输送、凝固壳和糊化区的影响。结果表明,钢液在湍流区的各种流动模式对温度和碳浓度分布有显著影响。在第 7 区之前,六种情况下的冷却水流量保持不变。案例 1 和案例 4 在第 7 区的峰值温度分别为 1253.11 和 1273.51 K,这表明喷雾特性是板坯表面温度变化的主要原因。从第 8 区开始,六个案例的冷却水流量发生了变化。六种情况在第 8 区的初始温度和最终温度分别相差 -21.39、17.87、46.95、-22.08、16.86 和 45.68 K,满足了板坯表面最大温度恢复率保持在 100 °C/m 以下的要求。然而,情况 2、3 和 6 的最终温度分别为 1225.62、1196.50 和 1218.91 K。因此,板坯可能出现塑性开裂。第 8 区末端特征线之间的六种情况的最大温度梯度差分别为 0.793、0.814、0.829、0.185、0.179 和 0.179 K/mm。这些结果表明,随着冷却强度的增加,优化对温度梯度差的影响并不明显。然而,通过增加冷却水流量,碳浓度均匀性略有改善。最后,中国一家国有钢铁公司选择了案例 5(板坯凝固端采用双喷嘴,冷却强度适中)作为板坯连铸机的最佳方案。双喷嘴提高并促进了冶金过程的高效和均匀生产。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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