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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。
According to the process and structure of a two-strand slab continuous casting 80 t tundish in a steel mill in China, the flow field under the flow control device was analyzed. The effects of two-layer turbulence suppressor, Influence of height on fluid flow characteristics in tundish. The results show that under the double turbulence suppressor, the flow field in the middle bag is the most reasonable when the dam is 2 000 mm long and 400 mm high, and the flow control device with dammer and dam is simple in structure, avoiding the influence of molten steel on weirs and other Flow control device in the package erosion and molten steel affect the slab cleanliness. Comparing the fluid flow characteristics before and after the optimization, the average residence time increased from 292 s to 380 s, the dead zone ratio decreased from 37.3% to 18.5%, and the ratio of piston area to dead zone increased from 0.35 to 0.65, which was in favor of the temperature of molten steel And the composition of the uniform, increasing the chances of inclusions float removal, help to improve the cleanliness of the slab.