A model for the drying of wet solid particles in the pipeline of a pneumatic conveying system Academic Article uri icon


  • The paper introduces a mathematical model for the mass, momentum and heat transfer in a one dimensional two phase flow. This model was applied to the drying of wet coal particles in a gas flow. The coal particles were assumed to have a wet core and a dry outer crust and the evaporation process of liquid from a particle was assumed to be governed by diffusion through the particle crust and convection into the gas medium. With evaporation, the wet core shrinks as the particle dries. The drying process is assumed to cease when: the moisture content of a particle falls to a predefined value; the crust temperature reaches the ignition temperature; or break-up of the particle occurs. Numerical simulation of a dispersed gas-solids flow, without mass and heat transfer, in a one dimensional transport system, was compared successfully with experimental results from a coal nitrogen conveying system …

publication date

  • January 1, 1997