行波磁场净化铝熔体中的感生电流分布

Distribution of Induced Current In Molten Aluminum Purification with Traveling Magnetic Field

采用模拟实验,对行波磁场净化铝熔体技术中影响感生电流分布和大小的因素进行了研究。结果表明,沿着磁感应强度的方向,增加金属熔体流网络的层数对感生电流分布影响不大,而在垂直磁场方向上,金属熔体网络的跨度必须尽量大于行波磁场发生器的极距,才能保证熔体中感生电流分布更趋均匀。采用外推的方法推断出工业条件下(金属熔体流网络间距趋近于零,且磁感应强度为0 1T)铝熔体中的极限感生电流值。采用轨线模型计算表明,此时当铝熔体以2cm/s的流速在截面积为4mm2的陶瓷管道中流过0 42m距离时,铝熔体中直径10μm以上夹杂物可以全部去除。

The parameters affecting the distribution and magnititude of induced current in molten aluminum purified by traveling magnetic field was studicd by simulative experiments.It proves that increasing the layers of the net composed of molten metal streams along the direction of the magnetic field has little effect on the distribution of induced current,but along the direction perpendicular to the magnetic field,the span of the net should be larger than polar distance of the generator of the traveling magnetic field so as to keep the homogeneity of the induced current.The ultimate current induced in the molten aluminum under the industrial condition(the distance between two neighboring metal streams inclines to zero,and the magnetic flux density is 01 T)is deduced by extrapolation.Besides,the calculation on trajectory model shows:when the aluminum molten flows with a speed of 2 m/s in a ceramic tube with section area of 4 mm2 over 042 m distance,all the impurities larger than 10 micrometer diameter will be removed thoroughly.