气力输送过程分支管路阻力特性的研究

在水平T型分支管道中，用压缩空气对平均粒径为0.25 mm的砂石进行气力输送试验。试验结果表明，在发送压力保持不变的情况下，输送气速和分支管路流量控制阀开度差值的变化，对分支管各自的阻力特性和相互间的压差有显著影响。当输送气速下降时，两分支管相互间的压差减小，各分支管的单位长度压差在开始时逐渐减小，但当气速下降到一定程度后，单位长度压差转而增大。当分支管流量控制阀开度差值由小变大时，两分支管各自的压差曲线逐渐远离，且两分支管相互间的压差逐渐增大。

RESEARCH ON RESISTANCE PROPERTIES FOR BRANCH PIPE IN PNEUMATIC CONVEYING

Pneumatic conveying experiment of average particle diameter 0.25 mm sand is carried out using compress air at horizontal tee branch pipe. The result shows the change of conveying velocity and the flow valve opening of branch pipe has some noticeable effect on the respective and mutual resistance properties of branch pipe when the operation pressure keep to a constant value. When the conveying velocity is less and less, the pressure drop between the branch pipes decreases, at the same time, the respective unit length pressure drop declines at first, but when the conveying velocity reduces to some extent, the respective pressure drop begin to rise. With the difference value rising of the flow valve opening, it is found that the pressure drop curve of the respective branch pipe is away from each other and the pressure drop between the branch pipes increase.