Electromagnetic separation techniques in metal casting. II. Separation with superconducting coils
Electromagnetic separation techniques in metal casting. II. Separation with superconducting coils
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DOI：
10.1109/20.917187
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发表时间：
2001-03
影响因子：
2.1
通讯作者：
S. Markarov;R. Ludwig;D. Apelian
中科院分区：
文献类型：
--
作者：
S. Markarov;R. Ludwig;D. Apelian
本文第二部分介绍了利用直流超导线圈对金属铸件中细小不导电夹杂物进行电磁分离的方法。从理论上分析了两种分离方法：1)平均流感应磁流体动力分离（锥形分离器）和2)外部注入电流电磁分离（螺旋分离器）。本文首先对Gillon和Pillin于1998年提出的锥形分离器模型进行了发展，并与实验结果进行了比较。指出分离效率差的主要原因可能是分离通道内的流动不均匀性和湍流。其次，介绍了一种带注入电流的电磁分离器模型。该模型具有性能好、流量均匀性高等优点。它能在8 T的磁场和1 kg/s的流速下分离大小为10 /spl mu/m的不导电夹杂物。研究了电磁分离的功率效率，考虑了熔融金属的焦耳加热。研究发现，采用超导线圈加注入电流的电磁分离器具有最高的功率系数，比传统分离装置的效率至少提高100倍。
The second part of this paper is devoted to the use of dc superconducting coils for electromagnetic separation of small nonconducting inclusions in metal casting. We theoretically analyze two methods: 1) magnetohydrodynamic separation with an electric current induced by a mean flow (conical separator) and 2) electromagnetic separation with an externally injected electric current (helical separator). First, the paper develops a model of the conical separator proposed by Gillon and Pillin in 1998 and compares it with experiments. It states that the main reason for poor separation efficiency can be flow inhomogeneity and turbulence in the separation channel. Second, the paper introduces a model of the electromagnetic separator with an injected current. Such a model has a number of advantages including better performance and higher flow homogeneity. It is capable of separating of nonconducting inclusions on the order of 10 /spl mu/m in size in a magnetic field of 8 T with a flow rate of 1 kg/s. Power efficiency of the electromagnetic separation is studied with respect to the accompanying Joule's heating of molten metal. It is found that the electromagnetic separator with a superconducting coil and an injected current has the highest power coefficient, at least 100 times greater than the efficiency of conventional separation devices.