单流板坯连铸中间包结构优化的数值模拟

针对二炼钢板坯连铸机浇铸DC04和SPHC系列钢种时存在中包水口非金属夹杂物结瘤频繁的问题,探讨通过优化中间包结构提高夹杂物去除率,并采用数值模拟的方法对优化前后的中间包做了钢水流场的模拟及夹杂物去除率的计算。实验结果表明,原中间包中存在短路流,优化后的中间包改善了钢液的流动状态,缩短了非金属夹杂物上浮的距离,显著提高了夹杂物的上浮率,特别是粒径为100μm的夹杂物,去除率提高了5.23%。

In order to solve the problem of frequent non-metallic inclusion nodule in ladle nozzle when casting DC04 and SPHC series of steel in the second steel-making slab continuous caster, it is discussed how to improve the inclusion removal rate by opti-mizing the tundish structure. Numerical simulation method was used to simulate the flow field of the tundish before and after opti-mization and calculate the removal rate of inclusions. The experimental results show that there is a short-circuit flow in the original tundish, and the optimized tundish improves the flow state of molten steel, shortens the floating distance of non-metallic inclusions, and remarkably increases the floating rate of inclusions, especially the inclusions with a particle size of 100 μ m,with the removal rate increased by 5.23%.