三流异型连铸中间包结构优化的数值模拟

Mathematical simulation of structural optimization of three-strand allotype continuous casting tundish

根据西宁特殊钢股份有限公司三流异型连铸中间包的结构和操作参数,提出中间包结构的优化方案,应用ANSYS CFX数值模拟软件计算不同控流装置下中间包内的流场和温度场分布,并建立物理模型对数值模拟的结果进行验证,确定最佳的优化方案。结果表明,原型中间包内流场和温度场分布不均匀,3个水口最大温差达3.11K,导致各水口处铸坯质量存在差异;使用U形挡墙后,中间包内钢液的流动特性得以改善,其成分和温度分布更为均匀,3个水口的最大温差仅为0.20K。

In light of the structure and operating parameters of the three-strand allotype continuous casting tundish in Xining Special Steel Co. , Ltd. , fluid flow and temperature field distribution were mathematically simulated under different flow control devices in tundish with the software ANSYS CFX and a new structure for tundish was proposed. On this basis, a physical model was established to verify the results of mathematical modeling and determine the best optimization program. The results show that flow field and temperature field distributions are uneven in the prototype tundish, and the maximum temperature difference between three outlets reaches 3.11 K, which leads to the difference in the quality of the bloom. After using the U-shaped baffle, the flow characteristics of molten steel are improved, which is favourable for homogeneous distribution of steel composition and temperature, and the maximum temperature difference between the three outlets is only 0.20 K.