特殊非对称型12流35t中间包的水模拟试验和控流装置的优化

Water Modelling Test of a Special Asymmetrical 12 strand 35t Tundish and Optimization of Flow Control Device

通过几何相似比1:3的水模型试验分析了钢厂特殊非对称型12流200 mm×285 mm铸坯的35 t中间包的结构特点,得出原中间包不对称度较大,结构不合理,整体混匀效果和各流的一致性较差,需要设计有效的控流装置以改善其内部流动。水模拟结果表明,通过所设计的相对较大的冲击区和两个导流孔的优化方案,使得中间包的整体混匀效果和各流一致性都得到明显改善,其总体死区比例相对原型的27.96%降至8.94%;其各流平均停留时间的标准差降低74%。

The structure characteristics of a special asymmetrical 12 strand 200 mm x 285 mm bloom 35 t tundish at steel works have been analyzed by geometric similarity 1 ： 3 water model test, it is obtained that the nonsymmetrical degree and structure of original tundish are larger and unreasonable led to poor consistent in each strand and relatively poor whole body mixing effect, so the effect control flow device should be designed to improve its internal liquid flow. Water modelling test results show that by using the designed optimum scheme with relative larger impact region and two guide flow hole, the whole body mixing effect of tundish and consistence of each strand improve obviously, as compared with original tundish its total dead region ratio decreases from original 27.96% to 8.94% and the standard deviation of mean residence time of each strand decreases by 74%.