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Performance of a Pressure Pneumatic Grain Conveying System

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.org

Citation:  Applied Engineering in Agriculture. 1(2): 72-79. (doi: 10.13031/2013.26768) @1985
Authors:   Kevin D. Baker, Richard L. Stroshine, George H. Foster, Kevin J. Magee
Keywords:   Corn, Grain, Pneumatic conveyor

POWER, pressure, and grain velocity of a pressure pneumatic grain conveying system were evaluated using dry shelled corn. Two system configurations (10 cm or 4 in diameter conveying pipe) were tested at grain flow rates of 3 to 20 t/h (100 to 800 bu/h) and at conveying air velocities of 15 to 30 m/s (3000 to 6000 fpm). Energy usage per tonne decreased as grain flow increased and increased as air velocity increased. All system pressure components increased proportionally as grain flow increased. Total system pressure was minimized with an air velocity of 20 m/s (4000 fpm). Pressure drop to initially accelerate corn was the same for both piping configurations and increased as air velocity increased. Pressure drop in the vertical pipe section decreased as air velocity increased. Median grain velocity decreased as grain flow increased. Reported values for terminal grain velocity approximated the difference between air velocity and grain velocity at locations where grain speeds were highest. At air velocities of 20 m/s (4000 fpm) or less, kernel velocity and corresponding potential for kernel impact damage were low.

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