Study on the Flow Trend of Particles in Shaft Coal Pocket of Coal Mine

Abstract

In order to obtain the flow trend of particles in the shaft coal pocket, Lay a foundation for the research on the stability of shaft coal pocket wall in coal mine. The flow trend of particles in the process both coal unloading and sand unloading is studied. The study methods are used by physical similarity simulation and numerical simulation experiment. The results show that the loose particles are divided into “three zones” in the longitudinal direction. As a whole, the particles in the shaft coal pocket is characterized by “two circles” which is the axis area and the bunker wall area. The better fluidity in the core, but the worse fluidity close to the bunker wall. The flow trend of the particles in the middle warehouse is as follows: the particles in the smooth passage in the central area flow out first. After flow out, the particles in this area will be filled by the particles in its upper area, then the outflow continues, the loose particles in the outer area of the middle flow out last. The particle flow trend in the natural flow area under the bearing structure is as follows: the loose particles in the funnel under the structure flow out according to the natural state. Due to the protection of its upper conical shell structure, the pressure of loose particles in this area are smaller than the upper area. which shown random natural outflow when coal outflow. The flow trend of bulk in the silo is basically consistent with the experimental results of numerical simulation.