A New Type Of Large Diameter And Six Entrances Dense Medium Cyclone Simulation Study

Integration of coal mining and coal preparation green production as a new model, by the coal preparation system construction to the mine, making coal gangue is discharged before being raised out of the mine, reducing the accumulation of waste rock damage to the environment, but also save energy, improve coal resource recovery, to achieve sustainable development of coal resources.A large diameter six entrances medium non-pressurized feed two products heavy medium cyclone of an adaptation to the integration of coal mining and coal preparation green production was studied in this paper. Since the study of heavy medium cyclone with conventional methods are high financial investment, long development cycles and vulnerable conditions and other shortcomings. There is an urgent need to use computational fluid dynamics (CFD) on heavy medium cyclone simulation conducted in order to obtain accurate results to shorten the study period and save the cost of the study,which is difficult by the experimental method.Firstly, the distribution of fluid velocity field (axial velocity, radial velocity, tangential velocity) of the ordinary two products hydro cyclone were analyzed theoretically. Then the RSM model and Mixture model of ANSYS Fluent software were used to simulate water and air flow. By the simulation of an new type of large-diameter and six entrances for non-pressure feed two products dense medium cyclone numerical, the swirled inner fluid corresponding axial velocity, radial velocity, tangential velocity and static pressure distribution in different sections were got finally. By studying the velocity distribution, the flow of the fluid inside the new type cyclone can be obtained. These three velocity inside the new type cyclone showed a certain regularity that tangential velocity was maximum which could generate a larger centrifugal force in consequence and the radial velocity was minimum which could increase the material stratification time, the axial velocity somewhere in between, the pressure distribution was analyzed in this paper. The results showed that the static pressure inside the swirled had symmetry, pressure decreased with the decreasing of the radius. And the negative pressure existed in the center part. it caused air was inhaled the hydro cyclone which produced a column of air. Velocity and pressure distribution was in line with the distribution of general hydro cyclone,which analyzed the possibility of the new type of heavy medium cyclone to achieve separation theoretically.