摘要:
通过对不锈钢连铸矩形连铸中间包水模型试验,分析其结构的合理性,针对流场存在的问题,就影响流场的因素,采用正交试验的方法对中间包内部控流元件进行优化验证。结果表明,下挡墙开口大小是影响流场的最关键因素。保持中间包液面稳定,在水口插入深度180 mm,拉速1.2 m/m in的情况下,综合考虑RTD曲线与流场显示,最佳的方案为上挡墙位置375 mm、上挡墙高208 mm、上下挡墙之间距离575 mm、下挡墙高100 mm、下挡墙开口0 mm。与原型中间包对比,能够很大程度地优化中间包流场,延长平均停留时间,减小死区比例,改善短路流现象,有效地均匀钢液和促进夹杂物聚集上浮。工业试验结果表明,采用优化挡墙组合控流中间包,能够较大程度提高铸坯纯净度,降低冷轧板废品率。
关键词:
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连铸 /
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中间包 /
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控流装置 /
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流场优化
Abstract:
Reasonableness of structure of the tundish of stainless steel slab casting had been studied by water model experiment.To aim at the influencing factors of flow field in tundish and the existing problems respective,flow control device was optimized through orthogonal optimization tests.The results showed the opening size of lower retaining wall is the key factor of influencing flow field.Considering RTD and flow field display synthetically,while liquid level retained stable,the insertion depth is 180 mm and the casting speed is 1.2 m/min,optimal process parameters is as follows,the distance from upper weir to ladle bottom is 375 mm,the height of upper weir is 208 mm,the distance from upper weir to dam is 575 mm,height of the dam is 100 mm,the opening of the dam is 0 mm.Compared with the prototype tundish,the flow field is improved to a great extent,average retention time is prolonged,the proportion of dead zone decreases,short circuit flow is effectively improved,molten steel becomes uniformity and inclusions clump and grow sufficiently.The results of industrial test showed that under the optimum condition of weir for tundish,purity of casting slab was greatly improved and reject rate of cold rolled sheet reduced.
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