Abstract
The paper presents a two-stage simplified method for the simulation of comminution process which takes place in a beater mill. The first stage of the proposed method is a simulation of the flow of gas and ore particles through a mill based on a two-phase continuous-discrete model. It allows to capture the interaction between the fluid flow and embedded particles, to determine trajectories of their motion and average velocities and frequencies of their collisions against the flywheel and the mill's walls. The second stage of the proposed method is a discrete element method simulation of the process of comminution of a single ore particle. It allows to determine the size distribution of created smaller particles in terms of normal velocity and angle of impact and to estimate the global efficiency of the comminution process. The proposed simulation methodology is applied for the verification of the innovative concept of the application of high–speed beater mill for the comminution of the copper ore.
Highlights
Beater mills are commonly used in coal power plants for final stage comminution of coal before the combustion stage
The particles collide at high speeds against blades of the flywheel and internal walls of the mill and they are effectively crushed into smaller fractions
The simulations of the elementary comminution process were performed for an idealised particle of spherical shape with a diameter equal to 40 mm
Summary
Beater mills are commonly used in coal power plants for final stage comminution of coal before the combustion stage. Their operation is based on a spinning flywheel, which induces the gas flow and allows the incoming coal particles to achieve high velocity. We can distinguish highly turbulent flow of the gas in the vicinity of the flywheel, the interaction of the flow and particles and, eventually, the ubiquitous process of particles comminution. All these phenomena are mutually dependent and they influence each other in an intrinsic way. They all substantially contribute to mill operation and to the efficiency of the comminution process
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