共查询到18条相似文献,搜索用时 156 毫秒
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薄板坯连铸中间包内抑湍器的模拟研究 总被引:3,自引:0,他引:3
控制中间包内钢液的合理流动对夹杂物的排除有重要影响,为此建立了模拟薄板坯连铸中间包流动情况的水模型。通过测定停留时间分布(RTD)曲线,研究了不同组合控流装置对中间包流体流动特性的影响。结果表明,结构及尺寸合理的抑湍器能延长水口响应时间及平均停留时间、提高活塞流区体积分数及降低死区体积分数;抑湍器与单坝组合的控流装置在控制流体流动方面效果极佳,而抑湍器与单墙单坝、单墙双坝组合的控流装置的控流效果不太理想。 相似文献
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根据国内某钢厂两流板坯连铸80 t中间包现场工艺及结构,在分析了其控流装置下的中包流场的基础上,研究了双层湍流抑制器下,挡墙位置和高度对中间包内流体流动特性的影响.结果表明:双层湍流抑制器下,挡坝距长水口2 000 mm,高400 mm时中包流场最合理,且抑湍器和坝组合控流装置结构简单,避免了钢水对堰等其他中包控流装置冲刷而污染钢水影响铸坯洁净度.对比优化前后的包内流体流动特性,平均停留时间由292 s提高到380 s,死区比例由37.3%降低至18.5%,活塞区与死区比值由0.35增大至0.65,有利于钢液温度和成分的均匀,增大了夹杂物上浮去除的几率,有助于提高铸坯洁净度. 相似文献
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板坯连铸中间包内控流装置结构的优化 总被引:2,自引:2,他引:0
以国内某钢厂板坯连铸中间包为原型,进行控流装置的物理和数值模拟优化,提出优化方案.对比物理模拟和数值模拟结果发现,对于不使用抑湍器的控流方案,数值计算获得的结论与实验模拟结果较一致;而对于使用抑湍器的方案,数值模拟可以减少示踪剂和流体的分离流动对停留时间分布曲线的影响,更准确地反映实际流场. 相似文献
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通过计算流体力学软件FLUENT建立的数学模型对钢厂200 mm×1 600 mm铸坯二流T型23 t中间包现挡墙和坝、湍流控制器和坝、湍流控制器和现挡墙以及新挡墙4种结构方案进行三维数值模拟,研究原中间包及安装不同控流装置后的钢水流动特性。结果表明,在所有的设计方案中安装有湍流控制器和坝的中间包能够达到最佳优化效果;中间包的死区体积分率由30.18%降到16.51%,活塞流区与死区的体积分率比RVp/Vd由55.80%增大到129.44%;中间包内流动稳定,有利于夹杂物的上浮。 相似文献
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采用1:3水模型实验对钢厂的八流150 mm×150 mm坯连铸不同控流结构80 t中间包内钢液流场进行了研究,并通过数值模拟进行验证。研究结果表明,中间包仅加湍流抑制器后对改善钢液的流动效果不明显,加上"V"型挡墙后能明显改善各流流动特性,湍流抑制器、"V"型挡墙和单坝组合能进一步提高各流的流动特性一致性,平均停留时间增大到505.22 s,在挡坝的两侧分别形成了明显的环流区。将单挡坝改为双挡坝后,Vp/Vd平均由原来1.77提高到2.63,死区比例平均也减少了6.0%,且各水口的稳定性最好,各流RTD曲线吻合度也最好,且存在3个大环流区和1个小环流区,水模型实验与数值模拟结果一致。 相似文献
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Rodolfo D. Morales Manuela Díaz‐Cruz Jorge Palfox‐Ramos Simn Lpez‐Ramírez Jos de Jesús Barreto‐Sandoval 《国际钢铁研究》2001,72(1):11-16
A three‐strand tundish belonging to a billet caster was water modelled and plant trials were performed to compare the performance of a pouring box and a turbulence inhibitor in terms of melt flow parameters and steel cleanliness. A tailor made turbulence inhibitor for this tundish is useful to accomplish with flow control of fluid turbulence and even melt redirection to all strands. The turbulence inhibitor helps to decrease nitrogen pickup during ladle changes and to float out inclusions towards the covering slag. As a consequence, rod operations to take of alumina deposits from nozzle walls are considerably decreased using a turbulence inhibitor. 相似文献
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通过采用流动力学软件FLUENT进行的数值模拟和几何相似比1:3的水模型分别研究了导流孔倾角30°的U型挡墙和导流孔倾角分别为20°,25°,30°的V型挡墙4种结构的挡墙对46 t两流T型Φ800 mm圆铸坯中间包钢液流动特性的影响,并采用稳态模拟计算中间包钢液的温度场分布。结果表明,两种模拟结果有良好的一致性;使用导流孔倾角20°的V型挡墙的中间包流动特性最佳,中间包出口流温差仅为4.0 K,整体最大温差为14.2 K,停留时间最长为803.1 s,死区体积分数最小为0.09,更有利去除钢液夹杂物,提高钢的洁净度。 相似文献
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R. D. Morales J. Palafox-Ramos J. de J. Barreto S. Lopez-Ramirez D. Zacharias 《Metallurgical and Materials Transactions B》2000,31(6):1505-1515
Water modeling and mathematical simulation techniques were used to study the melt flow under the influence of turbulence inhibitors
in a multistrand bloom caster tundish. Three different cases were studied: a bare tundish (BT), a tundish with two pairs of
baffles and a waved impact pad (BWIP), and a tundish equipped with turbulence inhibitor and a pair of dams (TI&D). Chemical
mixing of tracer turbulence diffusion was also simulated and compared with actual experimental results. The TI&D arrangement
showed an improvement of the fluid flow characteristics, yielding better tracer distribution among the outlets, lower values
of back mixing flow, and higher values of plug flow. A mass transfer model coupled with k-ɛ turbulence model predicted acceptably well the experimental chemical mixing of the tracer in the water model. The water modeling
and the numerical simulation indicated that the TI&D arrangement retains the tracer inside the vessel for longer times, increasing
the minimum residence time. These results encourage the use of turbulence-inhibiting devices in bloom and billet casters,
which pursue excellence in product quality. 相似文献
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