耗散型浸入式水口对1270 mm×150 mm板坯结晶器流场优化  

Optimization of flow field in 1270 mm ×150 mm slab mold by dissipative submerged entry nozzle

作　　者：王杨[1] 马党参[1] 杨卯生[1] 李京社[2] 杨树峰 WANG Yang;MA Dangshen;YANG Maosheng;LI Jingshe;YANG Shufeng(Special Steel Research Institute,Iron and Steel Research Institute Co.,Ltd.,Beijing 100081,China;School of Metallurgical and Ecological Engineering,University of Science and Technology Beijing,Beijing 100083,China;State Key Laboratory of Advanced Metallurgy,University of Science and Technology Beijing,Beijing 100083,China)

机构地区：[1]钢铁研究总院有限公司特殊钢研究院,北京100081 [2]北京科技大学冶金与生态工程学院,北京100083 [3]北京科技大学钢铁冶金新技术国家重点实验室,北京100083

出　　处：《中国冶金》2023年第10期65-72,80,共9页China Metallurgy

基　　金：国家自然科学基金资助项目(52074030,52104318)。

摘　　要：针对某钢厂1 270 mm×150 mm板坯结晶器生产中存在的液面波动问题,改进了浸入式水口结构,并分析改进后的浸入式水口对结晶器流场的影响。研究结果表明,改进水口后结晶器内部流场分布更加合理,表面流速降低,最大表面流速由0.414 m/s减小到0.365 m/s,降低了11.8%。速度场分布的粒子图像测速(PIV)结果与数值计算结果基本吻合,验证了数值计算结果的精确性。最后分别采用原型水口和改进后耗散型水口进行了结晶器油层波动水模拟试验,结果表明采用改进的耗散型水口后,不同拉速下的最薄油层厚度均远远大于原型水口,能够保证油层覆盖液面不裸露。当拉速增加至2.0 m/min时,采用原型水口最薄油层厚度仅为0.005 m,而采用耗散型水口时最薄油层厚度仍有0.015 m。采用新型耗散型水口能够有效降低结晶器自由液面波动,防止钢液二次氧化的发生。研究结果可为优化结晶器水口结构提供参考。Aiming at the problem of liquid level fluctuation in the production of 1270 mm ×150 mm slab mold in a steel plant,the structure of the submerged entry nozzle was improved,and the influence of improved submerged entry nozzle on flow field of the mold was analyzed.The results show that the flow field distribution in the mold is more reasonable after the improvement of nozzle,and the surface velocity decreases.The maximum free-surface velocity decreases from 0.414 m/s to 0.365 m/s,a decrease of 11.8%.The particle image velocimetry(PIV)results are consistent with the numerical calculation results of velocity field distribution,confirming the reliability of the numerical calculation results.Finally,water simulation experiments were conducted on the fluctuation of mold oil layer by the prototype nozzle and the improved dissipative nozzle respectively.The research results show that the thickness of the thinnest oil layer under different casting speeds after using dissipative nozzle is much greater than that of the prototype nozzle,which can stably cover the liquid surface without exposing.When the casting speed increases to 2.0 m/min,the thinnest oil layer thickness of the prototype nozzle is only 0.005 m,while the thinnest oil layer thickness is still O.015 m when using the new dissipative nozzle.Dissipative nozzle can effectively reduce the fluctuation of free-surface and prevent the reoxidation occurrence of molten steel.The research results can provide reference for optimizing the structure of mold nozzle.

关 键 词：结晶器 数值模拟 浸入式水口 表面流速 粒子图像测速 流场优化 

分 类 号：TF777[冶金工程—钢铁冶金]