七流连铸中间包流场的数值模拟

采用FLUENT软件对中天钢铁集团公司七流连铸中间包内型流场进行数值模拟,研究速度矢量、湍动能和流体迹线分布规律,分析中间包内有无C型挡墙加入的流场特征.模拟结果表明,加入C型挡墙使中间包的湍动能主要集中在入口区域,利于延长包内各流的平均停留时间,减小死区体积分数,包内各流流动更加均匀,有利于钢液温度和成份的均匀.     

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。     

漩流中间包流场的数值模拟

采用CFD软件Fluent对漩流中间包内的流场进行了数值模拟,分析了漩流中间包内的流场特征,以及漩流室的加入,中间包内的流动形态.模拟结果表明,由于漩流室的加入使湍动能耗散主要集中在漩流室内部,有利于夹杂物的聚合长大;漩流室的加入可改善钢液的流动状态,利于夹杂物的上浮。由于入口位置的非对称布置,造成了漩流中间包内的流场在入口区呈明显的非对称分布,这些结果为进一步优化漩流中间包内漩流室的位置和中间包挡墙参数提供了理论依据.     

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.     

异型坯中间包中钢液三维流场研究

针对马钢异形坯中间包,建立了相应的数模,利用流体力学软件FLUENT,在非等温条件下,研究在设置挡墙和坝前后中间包内钢水流场规律,为工业现场工艺优化提供科学参考.     

六流小方坯连铸中间包内型优化设计水模研究

通过水力学模型试验,研究了中间包内的流场和流动分布。研究表明：现场中间包内型结构欠合理。试验通过在中间包模型内加设V型档墙,并调整挡墙上开孔的数量、大小、倾角和位置来控制流体流动的方式,从而使流场得以改善,满足生产实际要求,保证了连铸机的正常操作和铸坯质量。     

中间包流场数值模拟

利用大型流体计算软件Fluent,对马钢连铸中间包的流场进行数值模拟.将模拟计算结果与现有中间包存在的实际现象对比表明,中间包在现有结构条件下分流和控流装置获得的流场分布不利于中间包钢水中夹杂物的控制和去除.通过改变原有中间包挡墙结构,从而改变中间包内流场分布,彻底改变了中间包中的流型结构,延长了流体质点的运动轨迹,增加了钢液的平均停留时间,为微型夹杂物的去除提供了有利条件.     

CSP中间包内腔优化的数值模拟

针对CSP中间包内冶金过程,建立中间包内钢水流场、温度场、夹杂物运动的数学模型,对不同挡墙和挡坝的5种组合方案的中间包钢水,从流动、传热和去夹杂能力等方面进行分析。结果表明:不同挡墙和挡坝的组合方案中,方案5效果最佳,其结构合理,钢液停留时间有效延长,利于夹杂物的上浮;没有明显的低温区域,中间包出口与入口的温差为5℃;对50μm的夹杂物能去除98.4%,对40μm的夹杂物去除率达到92.3%。     

小方坯连铸中间包内型优化试验

通过水力学模型试验 ,研究了中间包内的温度和浓度变化。研究表明 :现场中间包内型结构欠合理 ;设置横挡墙和“V”字型挡墙均可改善中间包内的流场 ;开口度为130mm×100mm横型挡墙和开口度为150mm×80mm“V”字型挡墙效果最好 ,它们均可保证在正常浇注条件下 ,使1 ,2流平均温差1℃左右。     

八流中间包内型优化水模实验

根据相似原理,利用水模拟钢液流动来研究中间包内流场的流动状况,通过调节中间包内挡墙位置及其开孔大小来改善和优化中间包内的流场。对比计算机采集的RTD数据及用墨汁作为示踪剂的照片寻求出最优化方案。得出经过改进的中间包各流平均停留时间增加50-90s,死区体积由25％～30％降低到14％～19％,活塞流的体积比从8％～13％增加到26％-27％,优化了中间包内的流场。     

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.     

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.     

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%.     

Fluid flow in large-capacity horizontal continuous casting tundishes

The configuration of the tundish for a two-strand horizontal continuous caster was designed and optimized through water modeling. Three designs of the tundish were studied: the original tundish without any flow control devices, the tundish with a turbulence inhibitor at the bottom, and the tundish with an inlet launder and an inclined dam. The residence time, the location and size of the dead zone, and the fluid field pattern were investigated. At the same time, the asymmetry flow field and wavy inlet jet in the horizontal tundish were observed and the reasons for them were discussed. The results indicate that the tundish with an inlet launder and an inclined dam is the best of the three designs.     

两流板坯连铸中间包结构优化水模实验研究

通过两流板坯中间包水模实验,研究了抑湍器以及不同控流装置的组合对中间包流动特性的影响.结果表明,合理使用抑湍器能延长开始响应时间,提高平均停留时间和活塞流体积.抑湍器和垱坝组合控流效果良好,且结构简单.由抑湍器、垱坝和挡渣堰组成的控流装置使中间包流场更加合理,优化后的中间包平均停留时间由原先的188 s提高到218 s,活塞流体积分数由3.50%提高到15.41%,死区体积分数由41.57%降低到32.15%.     

Dissymmetric flow phenomenon in a multistrand tundish

The dissymmetric flow phenomenon exists in a symmetric multistrand tundish. It was studied by the physical simulation experiment. The fundamental flow characteristic of dissymmetry was analyzed. The asymmetry of the flow field, the temperature field, and the inclusions distribution without flow-control devices (FCDs) were compared with those with FCDs. It is proved that the asymmetry of the flow and temperature field along the outlets at the long range is more obvious. The symmetric FCDs installation has a slight effect on the dissymmetric temperature field, simultaneously, the symmetry of the average residence time and the fluid flow pattern has improved, and the fluid flow in the tundish has been more reasonable. In case of a symmetric multistrand tundish having a large volume, the influence of the dissymmetric phenomenon should be considered and the flow behaviors in the whole tun- dish should be studied completely.