连铸生产中过程参数对夹杂物分离和分布的影响  

Influences of process parameters on the particle separation and distribution in continuous casting processes

作　　者：Rückert A Wuppermann C Pfeifer H 舒友亮 

机构地区：[1]德国亚琛工业大学工业炉和热力工程系

出　　处：《世界钢铁》2012年第6期25-31,共7页World Iron & Steel

基　　金：德国科学基金会的财政支持所给予的补助金PF394/11-1

摘　　要：作为连铸机中一个重要的设备,中间包是连接非连续的钢包冶炼和连续的结晶器中铸坯凝固的连接设备。中间包在生产超纯净钢过程中承担着重要角色,其主要目的是尽可能细化各钢种的夹杂物并提高钢水纯净度,尤其是当钢包更换而导致进入中间包钢水条件改变时。夹杂物会影响后续压力加工过程,且经常导致材质性能失效。钢水的纯净度对满足客户性能要求起着至关重要的作用。采用比例为1:3的单流中间包水模研究了不锈钢中夹杂物的去除。水模中的浸入式水口上配备有一个粒子计数器,此计数器可以计算出直径大于25μm的粒子分离率。由于粒度分布的相似性,水模中的粒子沉积速率可以转换到实际中间包中的熔体流动。对流动改变装置(例如冲击板)的影响进行了研究,同样也研究了有无冲击板条件下的不同尺寸粒子在中间包的粒子分布状态。采用雷诺应力湍流模型,应用有限体积商业软件FLUENT,进行了数值模拟。离散相的建模采用欧拉-拉格朗日方法。表面处颗粒分离采用一种特殊的边界条件。The tundish as part of a continuous casting machine is a connecting element between the discontinuous ladle metallurgy and the continuous solidification of slabs in the mould.The tundish plays a major role in the challenging task of ＂clean steel＂ production.The aim is to achieve the smallest number of inclusions and high cleanliness in all steel grades especially after changing the conditions at the inlet of the tundish due to ladle change.Inclusions hinder the metal forming process and often lead to fatigue.The cleanliness of steels is important to fulfil the customer＇ s requirements.The inclusion removal has been investigated in a 1：3 scaled water model of a single-strand tundish for the production of stainless steel.The water model is equipped with a particle counter which is integrated in the SEN pipe.This counter has been used to determine the separation rate for particle diameters up to 250 μm.With similarity conditions having been assured for the particles this deposition rate can be transformed to the melt flow in a steel tundish.The influence of flow modifying devices such as impact pads has been determined.Furthermore the particle distribution in the tundish for different size groups of particles has been investigated with and without an impact pad.Numerical simulations were carried out with the finite-volume commercial code FLUENT using the Reynolds Stress turbulence model.The discrete phase is modelled by the Euler-Lagrange approach.A special boundary condition for the separation of particles at the surface has been implemented.

关 键 词：中间包 分离率 水模研究 CFD(计算流体力学)模拟 钢水洁净度 

分 类 号：TF777[冶金工程—钢铁冶金]