In this paper, pulverized coal from industrial entrained-flow pressurized gasifier was selected to study the influence of fine particles on bulk and flow properties of powder. The original material for this study was an industrial grade pulverized coal containing around 50 wt.% of fines with size smaller than 40 mu m. The influence of fines (below 40 mu m) on the bulk and flow behavior of the pulverized coal was analyzed and a comparison between the influence of two size-cuts (<20 mu m, 20-40 mu m) was further given. Experimental results were obtained based on bulk and flow tests, including compressibility, permeability and shear tests etc. In parallel, a transparent Perspex hopper and an outlet uniaxial stress tester apparatus were fabricated to determine the discharge behavior and the collapse phenomena in the hopper, respectively. The stress at the outlet of the hopper was decreased gradually until reached a stable value and the more fine particles a pulverized coal contains, the more time required for it to stabilize. Accordingly, the pulverized coal performed different discharge behaviors at different packing time. Finally, a packing model was proposed to quantitatively describe the packing process of pulverized coal in the hopper and explain the various discharge behaviors at different packing times. (C) 2016 Elsevier B.V. All rights reserved.