Abstract： The flow state of alumina powders was detected by the pneumatic circulation conveying experiment device. The electromagnetic induction coil was located in different measuring points of the riser. The ferromagnetic powders as tracer materials of alumina particles were added. The electromagnetic induction sound signal acquisition device was used for electromagnetic induction coefficient value measurement. The results show that the electromagnetic induction coefficient value and alumina ferromagnetic particles flow exist linear relation. With the increase of the measuring point height, electromagnetic induction coefficient value decreases. When the riser clogs, the electromagnetic induction coefficient above congestion point section begins to decrease, that of below congestion point section begins to increase. By increasing air flow, the distribution state of particles can be effectively improved.

Keywords: alumina powder; ferromagnetic powder; pneumatic conveying; flow state

中图分类号：TK121         文献标志码：A

文章编号：1008-5548（2014）05-0024-04

DOI:10.13732/j.issn.1008-5548.2014.05.006

收稿日期：2013-12-15， 修回日期：2014-01-07，在线出版时间：2014-10-11。

基金项目：国家自然科学基金项目，编号：51276033。

第一作者简介：周云龙(1960—)，男，博士，教授，博士生导师，研究方向为多相流参数检测。 E-mail：neduzyl@163.com。

通信作者简介：杨宁(1989—)，男，硕士研究生，研究方向气固两相流多参数检测。 电话:13620752851，E-mail:1020219438@qq.com。