单侧孔长水口优化异型四流中间包流场

采用数值模拟方法研究了不同形式长水口下异型四流中间包的钢液流场和停留时间分布特征.数值结果表明：原型中间包存在较大的死区,各流流动情况存在着巨大的差异,而把直通型长水口替换成单侧孔型长水口之后,中间包死区比例减少,各流流动差异性基本上被消除.在挡墙的左侧产生了旋转流场,有利于夹杂物的碰撞聚合和去除.     

两流非对称中间包内控流装置优化的水模型研究

通过水模型实验和数值模拟,研究了两流非对称中间包采用不同控流装置时流体流动的特性.结果表明：圆形湍流控制器与单挡墙组成的控流装置中间包两出口流体流动差异较大;非对称长方形湍流控制器和多孔挡墙组成控流装置的中间包,两流之间的平均停留时间差异是圆形湍流控制器和单挡墙组成控流装置中间包的2/3,且近长水口侧出口的平均停留时间延长7.5%.     

宝钢板坯连铸机中间包三维流场数模研究

本文根据宝钢板坯连铸机中间包的形状和操作工艺参数,建立了一个钢液流动的三维数学模型,并利用数值计算结果,分析了宝钢中间包上、下挡墙结构对钢液流场的影响。结果表明,这种结构的中间包,有较合理的钢液流场。可避免钢渣卷入钢液流向水口进入结晶器,也有利于钢液内的夹杂上浮排除。     

马钢六流小方坯连铸机中间包内型优化水模试验

对我六流方坯连铸机Ｔ型中间包内腔优化的水模试验研究，在中间包内设置适当的纵向或横向挡墙，可以把大包注入的钢水较均匀地分配给各水口，减小各水口间的温差，尤其是解决了１，６流水口的低温状况，横向挡墙已在工业生产中采用，效果良好。     

马钢六流小方坯连铸机中间包内型优化水模试验

对马钢六流方坯连铸机T型中间包内腔优化的水模试验研究，在中间包内设置适当的纵向或横向挡墙，可以把大包注入的钢水较均匀地分配给各水口，减小各水口间的温差，尤其是解决了1，6流水口的低温状况．横向挡墙已在工业生产中采用，效果良好．     

不同挡墙对等离子加热中间包流体温度分布的影响

不同的挡墙以及安放不同的位置对中间包流体温度分布影响很大.长度为1000mm的直挡墙，位于距离水口中心线为150mm处，效果最好.     

板坯中间包控流装置结构优化的水模研究

根据相似原理,按照1：2比例对中间包建立水力学模型。考虑坝高、堰离底部高度、坝堰间距、堰与长水口注入点间距等参数对中间包内流场的影响,依据工厂实际工艺参数设计实验方案。对实验结果进行分析,结果表明：对原中间包结构进行优化,减小堰离底部距离及堰与注入点间的距离,钢液在中间包内响应时间由69.0 s延迟至75.0 s,平均停留时间由418.0 s增长至555.4 s,死区体积比例则由28.4%降至18.3%。     

浇铸MFT8钢中间包水口结瘤问题研究

浇注MFT8钢种一直存在中包水口结瘤问题,对生产顺行和产品质量造成不利影响,通过对中包水口结瘤物分析,发现主要是由氧化铝引发的结瘤问题,以此对工艺参数调整、适当延长钢水镇静时间及防止钢水二次氧化几个方面同时改进,有效控制了生产MFT8钢中包水口结瘤问题。     

连铸中间包充氩效果优化研究

通过研究冷态条件下管道压力、孔径、中间包孔盖、中间包密封等因素对中间包内氧含量的影响,优化中间包密封效果,并在热态条件下进行实践,结果表明中间包密封性良好的情况下,中间包预充氩后氧含量均达1%以下且中间包充氩150s后,包内氧含量基本已达最低值。     

小方坯中间包挡墙参数优化和物理模拟的研究

浇注小方坯的中间包控流装置一般为中间包挡墙,其影响中间包流场的参数主要有孔径、孔倾角、孔间距、孔高等。研究针对某厂中间包技术改进,采用了水模型对其中间包挡墙参数进行了优化设计。实验通过显著性分析研究了影响中间包流场的参数顺序,并通过正交实验寻找最优流场。     

中间包控流装置的物理模拟研究

根据相似原理,建立1∶3的物理模拟模型,通过正交试验考察了挡渣堰、导流坝组合控流装置对中间包流场的影响。研究结果表明,堰坝间距是影响流场的主要因素,优化控流组合方案为：挡渣堰距注入流中心线距离1 200 mm,挡渣堰下沿距包底距离500 mm,导流坝高度360 mm,堰坝间距300 mm.优化后中间包流场趋于合理,钢液在中间包内的停留时间延长,活塞流体积增大,死区体积减小.     

板坯连铸中间包钢液流场的数学模拟

利用计算机数学模拟的方法,对中间包内钢液流场进行研究,以济钢一炼钢厂4#板坯连铸中间包为模型,以挡墙分别距入口处、挡坝间的距离,挡墙和挡坝高度为影响参数,对板坯连铸中间包流场进行优化设计.得出有利于生产的设计数据.     

Fluid Flow in Tundish Due to Different Type Arrangement of Weir and Dam

Tundish is an important metallurgical reactor in the continuous casting process,In order to control the fluid flow in tundish and thus take full advantage of the residence time available for the removal of inclusions from molten steel,the effect of weir and dam on the fluid flow has been studied in a water model based on the characteristic number Froude and Reynold number similarity criteria.The residence time distribution curves of the flow were measured by SG800,The optimum arrangement of dam and weir and the nonstationary flow in tundish were discussed.The results show that the comnbination of weir and dam is benefit for the flow pattern in tundish,weir can prevent the upper recirculating flow.dam can cut off the bottom flow and turn to upwards,it is advantageous to separate the nometallic inclusions.Furthermore,it is importnat to exceed the critical depth of bath during exchange ladles,not only for the inclusion floatation but also for avoiding tundish slag drainage earlier.     

马钢CSP中间包水模实验研究

通过水力学模拟和正交实验方法,研究了马钢CSP中间包内钢液的流动模式和夹杂物排除情况,优化出中间包内设置挡渣墙和坝流控制方案,提出了浇注过程中中间包合理液面高度的控制参数.     

Influence of flow control devices on metallurgical effects in a large—capacity tundish

The influence of flow control devices on metallurgical effects in large-capacity tundish has been studied carefully with elements tracing,sampling and theoretical prospecting,The results from the studies are(1) in the continuous casting of clean steel,bad control of tundish operation may deteriorate the cleanliness of steel;(2) the cleanliness of steel is deteriorated mainly at the unstady state;(3) large amount of macro inclusions come from the top slag and the refractory of tundish;(4) installing dam and weir can improve the cleanliness of steel and lighten the influence of steel fluctuation;and (5) the result of theoretical calculation suggests that the inclusions larger than the critical size of 92.6um can be floated out from the tundish bath completely.     

Design optimization of flow control device for multi-strand tundish

The fluid flow phenomena in tundish have a strong influence not only on the uniform of composition and temperature of bath, but also on the separation of non-metallic inclusions, especially for the multi-strand tundish. A water model of a multi-strand tundish has been set up based on the Froude number and Reynold number similarity criteria. The effect of dam+weir and baffle on the uniform of composition and temperature of bath for different nozzles has been studied. The residence time distribution curves of the fluid flow were measured by SG800. Comparing the photos of the flow pattern in tundish, the optimum arrangement of baf-fle+dam was obtained. This new structure is benefit not only to uniform the temperature among different SENs (submerge entry nozzles) but also to separate the non-inclusions from the liquid steel, it can be widely used in multi-strand tundish.     

板坯连铸中间包内钢液流场和浓度场的数值模拟

采用FLUENT软件对板坯连铸中间包内的流场和浓度场进行数值模拟,分析中间包内有无挡墙以及挡墙参数变化引起中间包内流场、浓度场的变化情况。模拟结果表明,湍流控制器与挡墙的优化配合使中间包内钢液的平均停留时间由502 s延长至573 s,死区体积分数由29.7%降为14.4%,优化挡墙与挡坝参数有利于钢液温度和成份的均匀,及夹杂物的上浮去除。     

Dispersive bubble wall——a new method of flow control in tundish

Tundish is the last refractory vessel in the steelmaking process. The fluid flow phenomena in tundish have a strong influence on the separation of non-metallic inclusions. The dispersive bubble wall （DBW） is a new method in tundish metallurgy. A water model of a multi-strand tundish has been set up based on the Froude number and Reynold number similarity criteria. The effect of DBW＋weir on the flow pattern has been studied. The results show that this new structure of DBW＋weir is beneficial not only to uniform the temperature among different submerge entry nozzles but also to separate non-metallic inclusions from liquid steel. The DBW can capture the particles of non-metallic inclusions and make them float up to the surface.     

Improvement of tundish shape and optimization of flow control devices for sequence casting heavy steel ingots

The metallurgical effect of a round tundish used to cast heavy steel ingots in machine works at present was evaluated through water modeling experiments.The flow control devices of the improved oval tundish,which was used instead of the round tundish,had been optimized.The results show that the residence time of the round tundish is short,its inclusion removal efficiency is too low,and it has more dead zones and an unreasonable flow field.Compared with the round tundish,the improved oval tundish with the optimized weir and dam has a better effect:its minimum residence time is prolonged by 38.1 s,the average residence time is prolonged by 233.4 s,its dead volume fraction decreases from 26％ to 15％,and the ratio of plug volume fraction to dead volume fraction increases from 0.54 to 1.27.The inclusion removal efficiency also increases by 17.5％.