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以钢液停留时间分布曲线(RTD曲线)为评判标准,利用数学模拟方法,对某钢厂中间包控流装置进行优化设计。结果表明:将原型中间包的挡墙和挡坝间距增大,可以延长钢液平均停留时间,活塞区比例提高了17.15%,死区比例降低了2.2%。目前优化后的包型在现场稳定应用,以管线钢为例,夹杂物合格率提高了5%以上,明显提高了中间包的冶金功能。铸坯大样电解结果表明,优化后的中间包利于夹杂物的上浮去除,夹杂物总量平均为原包型的41.75%。
Taking the liquid steel residence time distribution curve (RTD curve) as the evaluation criterion, a mathematical simulation method was used to optimize the flow control device in a steel tundish. The results show that increasing the distance between the retaining wall and the dams in the prototype tundish can prolong the average residence time of the molten steel, increasing the proportion of the piston area by 17.15% and the proportion of the dead area by 2.2%. At present, the optimized package type is applied stably in the field. Taking pipeline steel as an example, the passing rate of inclusions is increased by more than 5%, which obviously improves the metallurgical function of the tundish. Large scale slab electrolysis results show that the optimized tundish is conducive to the removal of inclusions floating, the total amount of inclusions is an average of 41.75% of the original package.