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依据相似原理利用水模型试验测定了20 t 3流T形中间包不同试验方案下的RTD曲线,通过分析各方案的RTD曲线和混合模型计算结果,得出中间包挡墙最佳优化方案;优化后中间包钢液混匀时间由近250 s降低至约100 s,平均停留时间由500 s以上提高到1 000 s以上,包内死区体积比由近60%降至约20%,实测各流钢液温度差由5.33℃降至1.17℃,50μm以上铸坯大型夹杂物均不超过6.5 mg/10 kg;钢中小粒径夹杂物尺寸基本不超过6μm。生产实践表明,中间包新挡墙设置有利于均匀钢液温度以及增大夹杂物碰撞上浮去除的几率。
According to the principle of similarity, the RTD curves of 20 t 3-flow T-tundish under different experimental conditions were measured by water model test. The optimal solution of the tundish retaining wall was obtained by analyzing the RTD curves and the results of the mixed model. After the tundish molten steel mixing time reduced from nearly 250 s to about 100 s, the average residence time increased from 500 s to more than 1000 s, dead volume ratio within the package from 60% to about 20% The temperature difference of molten steel decreased from 5.33 ° C to 1.17 ° C. Large inclusions of slab above 50 μm did not exceed 6.5 mg / 10 kg. The size of small and medium inclusions in steel did not exceed 6 μm. Production practice shows that the tundish new retaining wall is set in favor of uniform molten steel temperature and increase the chances of inclusion collision floating up.