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由于订单日趋多样化,连铸过程中板坯宽度需要经常变化,同时由于浇铸周期的限制,通钢量一般维持不变。因此,固定通钢量研究铸坯宽度对流场的影响并采取相应控制策略有较大现实意义。采用1∶1水模型和工业试验研究了固定通钢量前提下宽度对板坯连铸结晶器内钢水液面特征的影响。水模型结果显示:宽度从1 050增至1 900 mm时,窄面撞击点位置由距弯月面370增至510 mm,且上回流涡心高度下移。通钢量固定为3.6 t/min,宽度从1 050增至1 900 mm时,液面平均波高从4.4降至2.5 mm,表面流速从0.42降至0.15 m/s。工业试验结果表明,通钢量为3.6 t/min时,结晶器内液面波动与表面流速随铸坯宽度增大而减小,与水模型结果一致。因此,在实际浇铸过程中,结晶器液面控制应根据铸坯宽度动态调节。
Due to the increasing diversity of orders, the width of the slab in the continuous casting process needs to be changed frequently, and at the same time, due to the limitation of the casting cycle, the throughput of the pass steel generally remains unchanged. Therefore, it is of great practical significance to study the influence of slab width on flow field and to adopt corresponding control strategies. 1: 1 water model and industrial test were used to study the effect of width on the molten steel surface characteristics in slab continuous casting mold. The water model results show that when the width increases from 1 050 to 1 900 mm, the impact point of the narrow surface increases from the meniscus 370 to 510 mm and the height of the upper return vortex moves downward. With a fixed throughput of 3.6 t / min and an increase in width from 1 050 to 1 900 mm, the average surface wave height dropped from 4.4 to 2.5 mm and the surface flow rate decreased from 0.42 to 0.15 m / s. The results of industrial tests show that when the flux of steel is 3.6 t / min, the liquid surface fluctuation and the surface flow rate in the mold decrease with the increase of slab width, which is consistent with the result of water model. Therefore, in the actual casting process, mold level control should be dynamically adjusted according to the slab width.