Abstract
To provide a basis for system design and analytical study of cohesive plug flow transportation, this work considers the conveying of coal powder as a single plug in 2″ and 4″ vertical pipes. The pressure drop and the plug velocity were measured at low air velocities and plug lengths. The results for the plug lengths studied show that the pressure drop increases linearly as the plug length increase and is not affected by air flow rates. The plug velocity varies little with the plug length as it is largely controlled by the air velocity. A model based on solid mechanics for predicting the pressure drop was tested and shows good agreement with the experimental data. This study indicates that the plug stability is affected by many factors such as initial bed length, powder properties and pipe diameter. For the effect of the pipe diameter, the maximum plug length decreases as the pipe diameter increases.
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