Research on Collision Depolymerization of Moist Fine Coal Agglomerate onto Flexible Flip-flow Screen Panel

Abstract

To explore collision depolymerization characteristics of the moist fine coal agglomerate onto the flexible flip-flow screen panel, referring to collision depolymerization behaviors of the agglomerate against the experiment vibration platform captured by the high-speed digital video, the liquid bridges damage ratio of the moist fine-grained agglomerate impacting on the flexible panel was proposed relating to real-time impact conditions (We*) and liquid bridges properties (Ie*). Moreover, combined with the practical screening condition of the flip-flow screen, simulations based on the coupled multi flexible body dynamics-discrete element method (MFBD-DEM) were adopted to investigate the collision depolymerization patterns of the moist fine coal agglomerate, and effects of collision conditions as well as liquid bridge properties on collision depolymerization characteristics are also analyzed. Results indicate that the first collision process greatly affects the depolymerization degree of the moist fine coal agglomerate. During the collision depolymerization process, the rotation of the central particle causes extensions of aggregated particles velocity differentiation and liquid bridges ruptures from the contact region to the non-contact region of the agglomerate. In the early-stage collision, both the maximum agglomerate expansion velocity and the maximum liquid bridges damage ratio were positively related to We* and We*/Ie*.

Keywords

• moist fine coal agglomerate
• flexible flip-flow screen panel
• collision depolymerization pattern
• expansion velocity
• liquid bridges damage ratio