六流中间包挡墙优化的数值模拟和工业实践

Numerical Simulation and Industrial Practice of Retaining Wall Optimization for Six-Strand Tundish

根据钢厂40 t六流重轨钢中间包的结构和工艺参数,通过Ansys Fluent软件数值模拟的方式,研究了其流场、温度场及RTD(停留时间分布)曲线。研究发现,原中间包流场及温度场分布不合理,各流一致性较差。通过正交试验,确定了挡墙开孔底部仰角10°、中部仰角10°、开孔上移0 mm的优化方案。模拟结果表明,通过优化设计,提高了中间包的整体流场速度,大幅降低了钢水的平均停留时间标准差,最低温度提高了14.2 K,各流水口温差缩小了1.77 K,各流一致性显著增强。40 t中间包U75V重轨钢的生产应用结果表明,优化后最远端水口(3号水口)平均停留时间由原687.1 s降至575.5 s,各流温差由2.05 K降至0.28 K,改善显著。

According to the structure and process parameters of a 40 t six-strand heavy rail steel tundish in a steel mill,the flow field,temperature field and RTD curve are studied through numerical simulation of Ansys Fluent software.It is found that the distribution of flow field and temperature field in the original tundish is unreasonable and the flow consistency is poor.Through the orthogonal experiments,the optimized scheme of an elevation angle of 10° at the bottom,an elevation angle of 10° in the middle,and a 0 mm upward movement of the opening of the retaining wall is determined.The simulation results show that through the optimized design,the overall flow field velocity of the tundish is increased,the standard deviation of the average residence time of molten steel is greatly reduced,the lowest temperature is increased by14.2 K,the temperature difference of each nozzle is reduced by 1.77 K,and the consistency of each flow is significantly enhanced.The production application results for casting U75 V heavy rail steel by 40 t tundish shows that after optimization the forthest nozzle(out 3) average residence time reduces from original 687.1 s to 575.5 s,the defference of temperature of each nozzle flow decreases from original 2.05 K to 0.28 K to improve obviously.