Experimental study of the blockage boundary for dense-phase pneumatic conveying of powders through a horizontal slit--颗粒学报PARTICUOLOGY

Hu, S., Zhou, F., Liu, Y., Kang, J., Zhang, Y., & Xia, T. (2015). Experimental study of the blockage boundary for dense-phase pneumatic conveying of powders through a horizontal slit. Particuology, 21, 128-134. https://doi.org/10.1016/j.partic.2014.06.011

Experimental study of the blockage boundary for dense-phase pneumatic conveying of powders through a horizontal slit

Shengyong Hu ^{b c}, Fubao Zhou ^{a b *}, Yingke Liu ^b, Jianhong Kang ^b, Yifan Zhang ^b, Tongqiang Xia ^b

a Key Laboratory of Gas and Fire Control for Coal Mines, China University of Mining and Technology, Xuzhou 221008, China
b Faculty of Safety Engineering, China University of Mining and Technology, Xuzhou 221116, China
c College of Mining Technology, Taiyuan University of Technology, Taiyuan 030024, China

10.1016/j.partic.2014.06.011

Volume 21, August 2015, Pages 128-134

Received 31 October 2013, Revised 16 June 2014, Accepted 28 June 2014, Available online 11 November 2014, Version of Record 6 June 2015.

E-mail: zfbcumt@gmail.com

Highlights

• Blockage boundary of dense-phase pneumatic conveying in a horizontal slit was studied.

• A minimum solid loading ratio existed for slit blockage at a given conveying pressure.

• A higher conveying pressure led to a greater minimum solid loading ratio.

Abstract

The estimation of the blockage boundary for pneumatic conveying through a slit is of significant importance. In this paper, we investigate the characteristics for blockage of powder (48 μm average diameter) through a horizontal slit (1.6 m × 0.05 m × 0.002 m). The results show that the required critical solid mass flow rate increases as the superficial air velocity increases superficial air velocity. The solid loading ratio and superficial air velocity displayed a decreasing power law relationship. This finding agrees with existing theory and experimental results. However, a minimum inlet solid loading ratio exists. When the air velocity is greater than the corresponding air velocity of the minimum solid loading ratio, the solid loading ratio exhibits an increasing trend in power law. We also found that when the inlet conveying pressure increased, the critical solid mass flow rate required for blockage, the inlet solid loading ratio, and the minimum inlet solid loading ratio increased.

Graphical abstract

Keywords

Dense phase; Pneumatic conveying; Blockage boundary; Horizontal slit

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