3种粮食颗粒倾斜气力输送悬浮速度的实验与回归分析

Experiment and regression analysis of inclined conveying suspending velocity of three kinds of grain

悬浮速度是气力输送装置重要的技术参数和设计依据,目前对管道中粮食物料悬浮速度的实验以及悬浮状态数的研究,大多局限于垂直管道。通过选择工程安装常见90°、75°、60°、45°等4种倾角的管道,对玉米、小麦、麸皮3种物料进行了悬浮实验,并对此3种物料悬浮速度进行了多项式回归分析。总结出3种粮食倾斜输送管道倾角α与悬浮速度v悬浮变化关系的回归方程,精确度较高。应用此方程可以求出3种粮食不同管道倾角α（0°~90°）对应的悬浮速度v悬浮,为倾斜管道气力输送装置设计的关键参数的确定提供了可靠的依据。结果发现,粮食物料的悬浮速度随着管道倾角的递减而递增,且数值变化较大,在工程设计时应充分考虑,合理选择倾斜输送管道内的空气速度。

Suspension speed is an important technical parameter and design consideration of pneumatic conveying equipment. At present, the researches on suspending velocity and suspension state of the grain materials were mostly limited to the vertical piping. In this study, the suspension experiment for corn, wheat, wheat bran materials were done through inclined pipe with 90°、75°、60°、45°, four different dip angles. Meanwhile, polynomial regression analyses of the three kinds of suspension velocity were also done. The regression equations, which has high accuracy, between the dip angle of grain conveying and suspension velocity were summed up. The suspension velocity corresponding to the dip angle （（0°~90°） of three different grain can be calculated by using these equations. These data provided a reliable basis for the key parameters for inclined pipe of pneumatic conveying device design. It was found that the suspending velocity of grain materials was increased with the decreasing of pipe dip angle, and the numerical changes were bigger. Therefore it should be given full consideration to these changes during engineering design, and the air velocity during inclined pipe of pneumatic conveying must be reasonably choiced.