四机四流大方坯连铸中间包结构优化

Optimization of Four-strand Tundish Configuration in Bloom Continuous Casting

通过水模拟实验,研究了鞍钢一炼钢大方坯连铸4机4流不同结构的中间包的流体流动特性。研究的结果表明,原结构的中间包同一侧的两流之间的流体流动特性存在很大差异,与内侧流相比,外侧流的最小停留时间、峰值时间和活塞体积分率小,死区体积大。采用优化后的湍流控制器及导流坝组合的中间包控流装置,外侧流和内侧流的停留时间分布曲线趋于一致,表明外侧流和内侧流之间的流动特性相接近。中间包结构优化后,平均夹杂物去除率由51.25%提高到73.46%,铸坯中夹杂物的粒度绝大部分小于10μm。

Fluid flow characteristics in four-strand tundish with different configuration in bloom continuous casting at No. 1 steelmaking plant, Anshan Iron & Steel Co., have been studied in water modeling experiment. It is found that large difference in flow characteristics exits between the two outlets at the same side of the tundish with the former configuration. Compared to the inside outlet, the outside outlet has short minimum residence time and peak concentration time, small plug volume and large dead zone volume. With the optimal tundish configuration by using a turbulence inhibitor and baffles, the RTD curves of the two outlets at the same side tend to be the same, showing that the flow characteristics between the two outlets are almost uniform. With the optimal tundish configuration, average inclusion removal degree is improved from (51.25 %) to (73.46 %), Most of inelusions in slab are smaller than 10 μm insize.