弯管气力输送炭黑的数值模拟与分析研究

Numerical Simulation and Analysis on Pneumatic Conveying of Carbon Black in Bend Pipeline

建立炭黑浓相气力输送的数学模型,对炭黑在弯管中的流动状态进行数值模拟分析。结果表明,炭黑颗粒在弯管中的流动状态不稳定,应尽量减少弯管数量,且两个弯管的距离不宜太短;弯管最易磨损,弯管30°～60°外壁面处的压力最大,磨损也最大,可在弯管的易磨损部位附加可更换衬板来延长弯管的使用寿命;炭黑在弯管中的输送压降与弯径比（R/D）有关,当R/D=5时输送压降最小,最有利于炭黑的稳定输送和节能输送。

The mathematical model of the dense-phase pneumatic conveying of carbon black was es- tablished,and the flow state of carbon black particles in the bend pipeline was simulated and analyzed. The results showed that,the flow state of carbon black particles in the bend pipeline was unstable,so the number of bend pipelines should be as few as possible and the distance between neighboring bend should be long enough. It was found that the bend pipeline was worn easily, and the maximum pressure appeared in the outer wall at the angles from 30° to 60° of the bend pipeline,where the wear was most serious. A replaceable liner could be applied at the easily worn position to prolong the service life of the bend pipeline. The conveying pressure drop was dependent on RID ratio, and the pressure drop was minimized when RID was 5, while the conveying was stable and energy consumption was low.