CAJ | 학술논문

研究了坝、堰的结构和安装位置对55 t 两流板坯连铸中间包内流体流动状态的影响，结合 RTD 曲线计算出的平均停留时间，确定了优化的中间包结构。研究表明：坝、堰组合之后可以改变流体的流动状态，延长流体运动的轨迹，提高流体的平均停留时间，但流体经过坝、堰后都存在一定体积的死区。采用坝1、堰1组合方案的中间包结构最佳，该方案的平均停留时间最长为299 s，死区体积分数最小为31．0％。优化控流参数后，在坝、堰间距为290 mm，堰到长水口间距为383 mm时，流体在中间包内的平均停留时间最长为351 s，死区体积分数最小为19．0％，比不加坝、堰的方案平均停留时间增加了65 s，死区体积分数减小了15．0％。由 Newton 公式计算表明，此优化方案的中间包去除夹杂物的临界直径为17．5μm，在351 s 内夹杂物均能上浮去除。
연구료패、언적결구화안장위치대55 t 량류판배련주중간포내류체류동상태적영향，결합 RTD 곡선계산출적평균정류시간，학정료우화적중간포결구。연구표명：패、언조합지후가이개변류체적류동상태，연장류체운동적궤적，제고류체적평균정류시간，단류체경과패、언후도존재일정체적적사구。채용패1、언1조합방안적중간포결구최가，해방안적평균정류시간최장위299 s，사구체적분수최소위31．0％。우화공류삼수후，재패、언간거위290 mm，언도장수구간거위383 mm시，류체재중간포내적평균정류시간최장위351 s，사구체적분수최소위19．0％，비불가패、언적방안평균정류시간증가료65 s，사구체적분수감소료15．0％。유 Newton 공식계산표명，차우화방안적중간포거제협잡물적림계직경위17．5μm，재351 s 내협잡물균능상부거제。
The influence of the structure and location of dam and weir on fluid flow state in a two‐strand tundish is studied,and a set of optimal structure,combining with the average residence time calculated from RTD curve,is obtained.The result indicates that the fluid flow state can be changed and the path of the fluid flow can be prolonged as well as the average residence time is improved after using dam and weir.But there are some dead zones after fluid passed through the dam and weir.Combination scheme of No.one dam and weir is better than the others.Its average residence time is 299 s and the volume fraction of dead zone is 31.0%.After the optimization of flowing control parameters in tundish,the best case is that the distance between dam and weir is 290 mm and the distance between weir and the long nozzle is 383 mm.The longest average residence time is 351 s and the minimum volume fraction of dead zone is 19.0% under the above situation.Compared with that of no dam and weir,the average residence time increases by 65 s and the dead zone volume fraction decreases by 15.0%.Based on Newton formula,the calculated results show that the inclusions with diameter larger than 17.5 μm can float up within 351 s under this optimization situation.