INFLUENCE OF LONGITUDINAL DIFFUSION ON TECHNOLOGICAL PARAMETERS OF DRUM DRYER

On the basis of differential equations of material balance and mass transfer for dried material and drying agent the equations of working and equilibrium line at countercurrent motion of phases in a drum dryer are derived. The algorithm of calculation is offered and comparison of technological parameters of drying process taking into account longitudinal diffusion with similar parameters calculated by the typical algorithm is carried out. Graphs of the obtained results in oblique Ramsin diagram and rectangular Euler coordinates are given. It is shown that taking into account the Peclet number of longitudinal diffusion, that is, the transition from the displacement mode to the longitudinal mixing mode, the calculated length and volume of the drum should be increased by 1.1 and more times at < 30.