水口不对称侵蚀对大方坯结晶器流场影响规律  

Influence of non-uniform corrosion of refractory material in SEN wall on flow-field of bloom

作　　者：孙宇秋 王敏 赵家七[1] 蒋露珩 包燕平 SUN Yuqiu;WANG Min;ZHAO Jiaqi;JIANG Luheng;BAO Yanping(State Key Laboratory of Advanced Metallurgy,University of Science and Technology Beijing,Beijing 100083,China;Technical Support Center for Prevention and Control of Disastrous Accidents in Metal Smelting,University of Science and Technology Beijing,Beijing 100083,China)

机构地区：[1]北京科技大学钢铁冶金新技术国家重点实验室,北京100083 [2]北京科技大学金属冶炼重大事故防控技术支撑基地,北京100083

出　　处：《连铸》2023年第6期25-35,共11页Continuous Casting

基　　金：山西省中央引导地方资助项目(YDZJSX2022C028);钢铁冶金新技术国家重点实验室基金资助项目(41621015)。

摘　　要：为研究水口不对称侵蚀对结晶器内钢液流动的影响,以某钢厂生产断面为300 mm×390 mm 55SiCr弹簧钢大方坯结晶器为原型,采用物理模拟和数值模拟两种方法展开研究。建立了1∶1结晶器物理模拟实验装置,通过试验得到拉速和浸入深度对结晶器流场的影响。结合水口解剖形貌,通过Fluent数值模拟软件,建立浸入式水口侧孔底部侵蚀模型,利用k-ε湍流模型和分数体积(VOF)模型相结合的方法,对结晶器内流场及钢渣界面相互作用行为进行了模拟。结果表明,当拉速为0.55 m/min时,平均波高小于0.5 mm,当浸入深度为120 mm时,测量点平均波高相差0.545 mm,确定了适合浇注的工艺参数为拉速0.65 m/min,浸入深度130 mm;水口侵蚀会导致结晶器偏流,流股对壁面冲击变强,钢-渣界面流速均匀性变差,局部出现较大漩涡,钢-渣界面高度差由21 mm增加至28 mm,并且出现了液面裸露。In order to study the effect of nozzle corrosion on the flow of molten steel in the mold, the mold of 55SiCr spring steel bloom with a cross section of 300 mm×390 mm was used as a prototype, which was studied by physical simulation and numerical simulation. A 1∶1 mold physical simulation experimental device was established, and the effects of casting speed and immersion depth on the mold flow field were obtained. Combined with the anatomical morphology of the nozzle, the corrosion model at the bottom of port of the submerged nozzle was established by Fluent numerical simulation software. The flow field in the mold and the interaction behavior of steel slag interface were simulated by using the combination of k-ε turbulence model and Volume of Fluid model(VOF). The results show that when the casting speed is 0.55 m/min, the average wave height is less than 0.5 mm, and when the immersion depth is 120 mm, the average wave height difference at the measuring point is 0.545 mm. The process parameters suitable for pouring are determined as follows: the casting speed is 0.65 m/min and the immersion depth is 130 mm. Nozzle corrosion will lead to mold bias, stream impact on the wall becomes stronger, velocity uniformity of steel-slag interface becomes worse, local vortex appears, the height difference of steel-slag interface increases from 21 mm to 28 mm, and the liquid surface is exposed.

关 键 词：大方坯 结晶器 物理模拟 水口侵蚀 数值模拟 

分 类 号：TF341.6[冶金工程—冶金机械及自动化]