共查询到18条相似文献,搜索用时 156 毫秒
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针对单流中间包连铸过程中流动状态不佳、钢液夹杂物含量较高等问题,提出了中间包控流装置的优化方案,采用数值模拟和水模试验研究了不同控流装置情况下中间包钢液流动行为及平均停留时间分布等特征。结果表明,最佳控流装置参数:堰距长水口距离1 090 mm,堰高度180 mm,坝堰间距260 mm,高坝高度340 mm时中间包钢液流场优化及夹杂物去除效果最佳。对比原方案中间包,优化后中间包钢液平均停留时间和活塞区均有所增加,死区降低7.14%;夹杂物平均去除率达到68.7%,较原方案平均去除率提高6.6%。 相似文献
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通过开展中间包控流装置布置的正交试验,研究了反应器结构对钢水流动行为的影响.着重探讨了不同尺寸中间包的控流装置布置规律及其对钢液流动行为和夹杂物去除的影响,定量化得到了双流板坯中间包控流装置布置与死区体积和结构影响因子D的关系.实验结果分析表明:中间包内部分活塞流体积不利于夹杂物去除,死区体积可准确反映钢液的洁净度水平;出水口抽吸作用对钢液流动行为影响较大,挡坝布置在距出水口1000-1300 mm时钢液流动形态较好,夹杂物聚集导致的水口结瘤率低至7.5%;0.0035<D<0.0085时,可获得板坯中间包在普通拉速下的流场特征与挡坝相对位置的关系;中间包内钢液与夹杂物的相对运动速度为大于6×10-5m·s-1时,夹杂物的上浮速度较大. 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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本实用新型涉及一种钢液连铸领域的防溅装置,确切地说是一种连铸中间包的防溅装置。中间包呈二重堰矩形,防溅装置安装在钢包长水口下方。所述的防溅装置为带波纹底的装置,其四周顶部带缘,侧壁开孔,条形波纹与中间包两个出水口连线相垂直,能有效地减轻中间包内钢液的湍流程度,提高钢液的纯度,并能及时排除钢液, 相似文献
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Xue‐min Yang Song‐xia Liu Jin‐sha Jiao Meng Zhang Jian‐ping Duan Liang Li Cheng‐zhi Liu 《国际钢铁研究》2012,83(3):269-287
In order to obtain the optimal structural parameters of the dug arch or round hole(s) at dam bottom in an 18–20 tons asymmetrical T‐type single‐strand continuous casting tundish, the flow field profiles and temperature profiles of molten stainless steel in the tundish with arch or round hole(s) at dam bottom have been investigated using hydrodynamic modeling coupled with mathematical simulation. The optimal structural parameters of arch hole(s) at dam bottom can be obtained from hydrodynamic modeling as that two arch holes with 30 mm as height and 50 mm as radius are symmetrically dug at dam bottom with the distance between arch hole center and dam center as 205 mm; or the optimal structural parameters of round hole(s) can be recommended as that one round hole with 70 mm as diameter is dug at left of the dam bottom with the distance between hole center and dam center as 205 mm. The results of mathematical simulation suggest that digging arch or round hole(s) at dam bottom with above‐mentioned structural parameters cannot obviously induce negative effects on streamlines and velocity vector profiles of molten stainless steel in the tundish by short circuit flow via arch or round hole(s) at dam bottom. The calculated temperature drop of molten stainless steel between the submerged ladle shroud and submerged entry nozzle in the tundish with arch or round hole(s) at dam bottom is about 3.0 K, the maximum temperature drop of molten stainless steel in the tundish is about 6.0 K. 相似文献
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