Numerical simulation of dense pneumatic conveying of pulverized coal in horizontal pipe at high pressure

A new frictional-kinetic model for dense phase pneumatic conveying of pulverized coal in a horizontal pipe at a high pressure was established.This model treated the kinetic and frictional stresses of particles additively.The kinetic stress was modeled by using the kinetic theory of granular flow.The friction stress proposed by Srivastava et al.was modified to account for dense phase pneumatic conveying.The simulation results included profiles of gas and particle phase axial velocity,profiles of solids concentration,profiles of the turbulence intensity of gas and particle phase,as well as the value of pressure gradient.The formation and motion process of the settled layer were verified.An experiment was also carried out to validate the accuracy of the simulation results,which showed that the predictions of pressure gradient were in good agreement with the experimental data.