Experimental Study on Absorption Spheres Pile after the Interruption and Restart of Pneumatic Conveying

The experiments were conducted in a positive pressure system to investigate the absorption spheres pile after the pneumatic conveying interruption and the restart characteristics.The ambient air was used as the source gas.The absorption spheres were replaced by the glass spheres.The average pile height in the conveying pipe of the experiment system was 1172 mm,which was ~11% of the transport pipe height,as the pneumatic conveying interruption happened at the steady state stage.The continuing spheres supply from the feeder during the blower flow rate decreasing process should be the main factor for the pile up amount of spheres in the conveying pipe.The spheres amount in the steady state conveying line was only ~10% of the pile amount.The maximum and steady state pressure drop of the gas-solid conveying line in the restart process were approximately equal to those of the normal start process.