共查询到20条相似文献,搜索用时 109 毫秒
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板坯连铸机中间包的物理模拟 总被引:3,自引:0,他引:3
通过对超低头板坯中间包的物理模拟,采用聚乙烯粒子模拟大颗粒夹杂物在中间包的上浮行为研究,确认采用单墙单坝的控流方式有利于夹杂的上浮,并找到了上挡墙和坝在中间包的最佳位置。同时认为以塞棒控流中间包的临界液面高度应大于150mm。 相似文献
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采用水模型和工业验证的方法针对40 t单流中间包的控流装置进行优化配置研究.通过对单独湍流抑制器控流装置、湍流抑制器+下挡墙组合控流装置、湍流抑制器+下挡墙+上挡墙组合控流装置的研究表明,下挡墙在改善钢液流动形态和减少中间包内死区方面所起的作用大于上挡墙.平均停留时间随下挡墙与长水口的距离增加呈先增大后减小的趋势.确定了单流中间包以湍流抑制器+下挡墙的优化组合形式,死区比例由原来的25.9%降低到了13.6%.通过系统取样分析发现优化后中间包内T.O和N含量大幅降低,正常坯中的大型夹杂物质量分数也由原来的8.4×10-7降低到3.2×10-7. 相似文献
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采用水力学数学模拟的方法,研究了3号多孔挡墙和U挡墙对昆钢小方坯连铸中间包流动特性的影响。水力学模拟依据相似原理,用"刺激—响应"实验方法,测定不同工况下停留时间分布(RTD)曲线,得到两种挡墙对中间包流体流动的影响。然后用数学模拟的方法验证水力学模拟的合理性。研究结果表明:3号多孔挡墙可以延长1号、2号水口响应时间及平均停留时间,缩短了3号水口响应时间及平均停留时间,控制各流流动趋于一致。中间包内流体流动特性得到明显改善。使用U挡墙后,钢液的平均停留时间Ta有了大幅增加,但各水口的初次响应时间差距较大,各流的流动特征一致性较差。因而,3号多孔挡墙控流效果优于U挡墙。 相似文献
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Hydraulics and Mathematics Simulation on the Weir and Gas Curtain in Tundish of Ultrathick Slab Continuous Casting 总被引:1,自引:0,他引:1
Dengfu Chen Xin Xie Mujun Long Min Zhang Leilei Zhang Qi Liao 《Metallurgical and Materials Transactions B》2014,45(2):392-398
The molten steel flow pattern in continuous casting tundish could be improved if the flow control devices were properly used. With reasonable application of weir and air curtain, the disturbance at injection zone of the tundish was reduced. The flow path of the molten steel was changed, and the short-circuit flow was eliminated. Therefore, the residence time was lengthened. An air curtain with bubbles floating could promote the surface flow and improve inclusions removal. The application of weir and air curtain in an ultrathick slab continuous casting tundish was investigated with hydraulics and mathematics simulation. The residence time and dead volume fraction were studied through orthogonal experiments with different positions of the flow control devices. The efficiency of three factors was analyzed, and the optimum positions of the weir and air curtain were obtained. Besides, the discrete phase model was suitable for simulation of the interaction between gas bubbles and molten steel, and the mathematics results shown the optimum one got larger inclusion flotation rate. 相似文献
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The quality of the steel (degree of cleanness in the finished material) can be influenced to a great extent by the flow conditions in the continuous casting tundish and the resulting conditions for the separation of non‐metallic inclusions. Whereas in the literature a lot of numerical simulations about the flow patterns of regular casting tundishes have been published, the effects of disturbances like the absence of a strand or the progressive wear of the flow control devices in the tundish on the flow behaviour will be investigated here. It will be shown that the absence of single strands exerts much less influence on the total flow behaviour in the tundish than variances of the flow control devices. 相似文献
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根据衡阳钢管水平连铸中间包的实际情况,采用1:1.5的相似比例建立水模拟系统,对水平连铸中间包内钢液流场进行研究.得出水平连铸中间包内钢水流场与弧形连铸中间包内钢水流场的主要区别,提出了优化水平连铸中间包钢水流动的方向。 相似文献
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利用数值模拟对宣钢十二机十二流连铸机中间包的三维流场、浓度场和温度场进行研究,优化出了最佳控流装置。应用结果显示,采用优化结构后的中间包,流场明显改善,各流的流动特性趋于一致,高温钢液对第6流塞棒的冲击减轻,各流最大温差由优化前的10 K降低为优化后的4 K。且连浇时间由优化前的20 h延长到26 h。 相似文献
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为减少不镑钢连铸坯中夹杂物的数量,开展了不锈锅板坯连铸中包水槌实验。在水模实验的基础上.进行了连铸中包控流装置的生产试验。试验表明,中包控流装置可以比较有效地去除钢中大颗粒非金属夹杂物. 相似文献
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Fluid flow and inclusion removal in continuous casting tundish 总被引:10,自引:0,他引:10
Lifeng Zhang Shoji Taniguchi Kaike Cai 《Metallurgical and Materials Transactions B》2000,31(2):253-266
Three-dimensional fluid flow in continuous casting tundishes with and without flow control devices is first studied. The results
indicate that flow control devices are effective to control the strong stirring energy within the inlet zone, and other zones
are with much uniform streamline. By dividing tundish into two zones with different inclusion removal mechanisms the inclusion
removal is calculated. Three modes of inclusion removal from molten steel in the tundish, i.e., flotation to the free surface, collision and coalescence of inclusions to form larger ones, and adhesion to the lining solid
surfaces, are taken into account. The Brownian collision, Stokes collision, and turbulent collision are examined and discussed.
The suitable coagulation coefficient is discussed, and a value of 0.18 is derived. Calculation results indicate that, besides
flotation, collision of inclusion and adhesion to the lining solid surfaces are also important ways for inclusion removal
from molten steel in tundish especially for the smaller inclusions. The flotation removal holds 49.5 pct, and the adhesion
removal holds 29.5 pct for the tundish with flow control devices; the collision effect is reflected in improving flotation
and adhesion. Finally, industrial experiment data are used to verify the inclusion removal model. 相似文献
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In the continuous casting process for high quality steel grades, activities are mainly focused on avoiding reoxidation and promoting non-metallic inclusion removal during steel transfer from the ladle through the tundish to the mould. In this paper, methods to effectively control flow from the tundish to the continuous casting mould are described and specific state of the art refractory solutions are also introduced. 相似文献