Research of Swirling Flow Pneumatic Conveying System in a Horizontal Pipeline. 3rd Report, Coefficients of Power Consumption and Additional Pressure Drop.

Abstract

Polystyrene, polyethylene and polyvinyl pellets with mean diameters of 1. 7, 3. 1 mm and 4. 3 mm, respectively, were transported as test particles in a swirling flow pneumatic conveying system consisting of a horizontal pipeline of 13 m length and 80 mm inner diameter. The initial swirl number was varied from 0. 58 to 1. 12, the mean air velocity from 9 m/s to 24 m/s and the solid mass flow rate from 0. 43 kg/s to 1. 17 kg/s. It is found that the critical and minimum air velocities of swirling flow pneumatic conveying are lower than those of axial flow pneumatic conveying, the maximum reduction rates being 13% and 17%, respectively. In the lower air velocity range, the power consumption and additional pressure drop are decreased by the swirling flow pneumatic conveying system.