板坯结晶器内流场流态控制的插钉板工业试验研究  

Industrial trials on flow pattern control inside a slab continuous casting mold using nail board measurements

作　　者：张建元 赵喜庆 王志通 陈威 张立峰 ZHANG Jianyuan;ZHAO Xiqing;WANG Zhitong;CHEN Wei;ZHANG Lifeng(Lingyuan Iron and Steel Co.,Ltd.,Lingyuan 122500,China;School of Mechanical Engineering,Yanshan University,Qinhuangdao 066004,China;School of Mechanical and Materials Engineering,North China University of Technology,Beijing 100144,China)

机构地区：[1]凌源钢铁股份有限公司,辽宁凌源122500 [2]燕山大学机械工程学院,河北秦皇岛066004 [3]北方工业大学机械与材料工程学院,北京100144

出　　处：《炼钢》2025年第2期74-84,共11页Steelmaking

基　　金：国家自然科学基金资助项目(U22A20171);国家重点研发计划资助项目(2023YFB3709900)。

摘　　要：结晶器内夹杂物运动和去除主要受钢液流动的影响,钢液流场流态也直接决定了连铸过程传热和凝固等现象。通过插钉板工业试验测量手段对某钢厂1300 mm×230 mm断面结晶器内宏观流态、弯月面流速和液位分布进行系统的研究,得出关键连铸工艺参数如拉速、吹氩流量和水口浸入深度的影响规律。结果表明,低拉速(≤1.0 m/min)情况下吹氩流量是决定结晶器内流场流态分布的主要因素。高拉速(≥1.3 m/min)情况下即使吹氩流量增大至6~10 L/min,流态仍然为双环流。弯月面流速整体上随着水口浸入深度的增大而减小,但水口浸入深度对流场流态的影响较小。液位波动大小随着拉速和吹氩流量的增大而增大。吹氩流量从6 L/min增大至8 L/min后,1.2 m/min和1.6 m/min拉速下大于3 mm液位波动占比分别从零增大至6.7%和15.0%。得到不同氩气体积分数β_(Ar)与通钢量Q _(steel)下流态临界转换关系,双环流向复杂流转变时临界氩气体积分数和通钢量之间的关系式为β_(Ar)=-4.2+7.8 Q _(steel),复杂流向单环流转变时临界氩气体积分数和通钢量之间的关系式为β_(Ar)=-5.6+9.8 Q _(steel)。The movement and removal of inclusions inside the mold are mainly influenced by the flow pattern of the molten steel,and the flow pattern also directly determines phenomena such as the heat transfer and solidification during the continuous casting process.In the current study,systematically industrial trials on the macroscopic flow pattern,meniscus speed,and surface level inside a 1300 mm×230 mm section mold were performed using nail board measurements.The effect of key continuous casting process parameters such as the casting speed,argon flow rate,and immersion depth of the submerged entry nozzle(SEN)on the flow pattern was proposed.Results indicate that the argon flow rate under low casting speeds(≤1.0 m/min)was the primary factor determining the flow pattern inside the mold.Under high casting speeds(≥1.3 m/min),the flow pattern remained as a double roll flow even with the argon flow rate increased to 6-10 L/min.The meniscus speed decreased as the SEN immersion depth increased,but the SEN immersion depth had little effect on the flow pattern.The level fluctuation increased with the increase of the casting speed and argon flow rate.After the argon flow rate increased from 6 L/min to 8 L/min,the proportions of level fluctuations greater than 3 mm at casting speeds of 1.2 m/min and 1.6 m/min increased from 0 to 6.7%and 15.0%,respectively.The critical transition relationship between the different gas volume fractionβ_(Ar) and the steel throughput Q _(steel) was obtained.The relationship between the critical argon volume fraction and the steel throughput wasβ_(Ar)=-4.2+7.8 Q _(steel) when the double roll flow changed to complex flow,and the relationship between the critical argon volume fraction and the steel throughput wasβ_(Ar)=-5.6+9.8 Q _(steel) when the complex flow changed to single roll flow.

关 键 词：流场流态 弯月面流速 液位波动 插钉板测量 板坯连铸 

分 类 号：TF777.1[冶金工程—钢铁冶金]