Study on Optimization of the Baffle for Two-strand Slab Caster's 80 t Tundish
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摘要: 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。Abstract: Flow field of the two-strand slab caster's 80 t tundish equipped with flow control devices in a certain domestic steel plant was studied.Based on this research,the effects of position and height of tundish dam on flow field were tested and analyzed.It is concluded that with a double-deck turbulence controller,the flow field of the tundish was the most reasonable when the dam of 400 mm is installed 2 000 mm away from long nozzle;the structure of the flow control device consisting of turbulence controller and dam is so simple that it can protect molten steel from being polluted by its scouring to the dam or other tundish devices.Compared with previous tundish,the average residence time of fluid is increased from 292 s to 380 s,dead area ratio decreased from 37.3% to 18.5%,and ratio of piston area to dead area increased from 0.35 to 0.65,which is beneficial to uniformize steel temperature and composition,maximize inclusion floating and removal and improve cleanness of slab.
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Key words:
- continuous casting of slab /
- tundish /
- structure optimization /
- molten steel /
- flow characteristic
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