小方坯干式料包与快换水口的应用

介绍了干式料包和不断流快速更换定径水口技术在小方坯连铸机上的应用.通过两项技术的综合应用,提高了包龄,稳定了生产组织,降低了事故,大幅度降低了钢水消耗,取得了良好的效果.     

多流T型中间包流场和温度分布模拟研究

针对6流和8流T型连铸中间包内钢液的流动情况建立了数学模型,采用FLUENT商业软件计算了两种构造的中间包内钢液的流动状况和温度分布情况。比较不同出口之间钢液流速和温度分布的差异,研究结果显示8流中间包和6流中间包的温度场和速度场分布大致相同,但两种中间包内各出口的温度差却存在较大差异,8流中间包的最大温差较6流中间包大2 ℃。通过研究确定了有利于发挥中间包冶金功能的中间包设计方案,为中间包的设计优化和现场生产提供了理论依据。     

Particle Distribution and Separation in Continuous Casting Tundish

The tundish as a part of a continuous casting machine combines the discontinuous ladle metallurgy with the continuous solidification of slabs in the mould. The tundish plays a major role in the challenging task of “clean steel” production. That means the smallest number of inclusions and high cleanliness in all steel grades after changing the conditions at the inlet of the tundish. Inclusions hinder the metal forming process and lead often to fatigue. The cleanliness of steels is important to fulfil the customer's requirements. In the present study inclusion removal was simulated in a 1:3 scaled water model of a single‐strand tundish for the production of stainless steels with a particle counter. The particle counter is capable of counting a large number of particles with a wide range of diameters. The separation rate for particle diameters from d_P = 1 ‐ 250 μm was determined with a counter for the water model tundish. With similarity conditions for the particles this deposition rate can be transformed to the melt flow in a steel tundish. The separation rate was measured for different flow rates in the water model tundish. A larger flow rate decreased the separation rate. Additionally, the separation rate for the tundish fitted with an impact pad was measured and showed a significant increase of separation for particles with a smaller diameter. Furthermore, the particle distribution in the tundish for different size groups of particles was investigated with and without an impact pad. Numerical simulations were carried out with the finite‐volume commercial code FLUENT using the realizable k‐ε turbulence model. A special boundary condition for the separation of particles at the surface was implemented.     

连铸中间包覆盖剂对钢液含碳量的影响

通过对异常钢材力学性能的分析研究 ,发现连铸中间包低碳覆盖剂对钢液含碳量的影响。明确这一问题 ,对于规范连铸工序的中间包操作 ,确保钢材质量的稳定性是极其重要的     

模铸连浇中间包控流装置优化的水模实验

通过水力学模拟实验,优化了模铸连浇中间包控流装置。结果表明,安装控流装置,并将开孔设于挡墙下部正中间时,流体在中间包内的停留时间较长,死区体积最小,夹杂物上浮率也较高,而且不存在短路流。因此,经过控流装置优化,流体在中间包内的流场也得到明显改善,流动模式较合理,有利于钢中夹杂物的上浮去除,可以保证浇注大钢锭的质量。     

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.     

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.     

多流连铸中间包流动与传热耦合过程的数值模拟

对原设计和改进设计的六流连铸中间包内钢液流动与传热耦合过程进行了数值模拟计算,并进行了生产现场的实测对比研究,说明改进后的中间包比原设计中间包能更好的满足生产的要求。     

基于中包钢水连续测温的二冷配水控制模型与系统

以黑体空腔式中间包钢水连续测温系统所实时获取的钢水温度为基础,建立了板坯传热微分方程和二冷动态配水模型,确定了水量、拉速和过热度三者的关系,设计了基于中间包钢水连续测温的二冷配水控制系统。现场应用表明：所建立的模型有效合理,所开发的控制系统稳定可靠,均能够满足现场生产需要。     

等离子加热六流连铸中间包底吹气过程数值模拟优化研究

针对宝钢六流连铸中间包等离子加热区域温度积聚严重的现象,提出了底吹气的解决方法.采用自编程序,在流动与传热耦合计算的基础上,对底吹气参数进行了仿真模拟研究.结果表明,无底吹气时,加热区域上部高温钢液不能很好地混匀并向两侧传输,而采用底吹气方式时,加热区域钢液温度比较均匀,两侧温度分布情况也有所改善.现场试验对比表明,采用优化后的底吹气方式,对夹杂物分布、增氮量、流间温差没有影响,且能明显改善中间包包盖的熔蚀问题.