气力输送中断后吸收球堆积及重启动试验研究

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

在以常温常压空气为气源的正压气力输送试验系统中,用玻璃球代替吸收球,研究气力输送中断后吸收球颗粒在输送管侧的堆积及重新启动特性。结果表明:处于稳定输送阶段的气力输送中断后,所用实验装置输送管侧的颗粒平均堆积高度为1172 mm,约占输送管总高度的11%;风机流量减小过程中供料器继续对输送管的供给对颗粒堆积量具有重要影响,稳态气力输送时的输送管内所含颗粒量约占堆积量的10%;重启动过程中气-固两相流段最高压差及稳态输送压差大小与初次启动时相比无变化。

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.