气力输送Y形分支管网固相流量分配特性的研究

Solid-Phase Flow Distribution Characteristics of Pneumatic Conveying Y-Type Branch Pipe

在水平 Y 形分支管道中,将压缩空气作为输送动力,粒径相同而密度不同的小米及玻璃珠作为输送介质,进行气力输送试验,对分支管道的固体流量分配特性进行研究。试验表明:在此次的试验条件下,随着变动支管与主管中轴线夹角的增大,分配到该支管的固体质量分数减小。对于同一分支管,当气体表观速度大于临界速度时,气体表观速度的变化对固相分配特性影响不大;当气体表观速度小于临界速度时,随气体表观速度的减小,分配到变动支管的固相质量分数增大。同时,采用主成分分析法对固相分配特性各影响因素的重要性以及各因素之间的相关性进行分析,得出分支管与主管中轴线夹角、气体表观速度是影响 Y 形分支管道流量分配特性的主要因素,与试验得到的结论一致。

In horizontal Y-type branch pipe, compressed air services as conveying power and millet and micro-glass bead with same grain size and different density as conveying media, in order to carry on the pneumatic conveying experiment and then to study on solid-phase flow distributional characteristics in branch pipe. The experiment indicates that distributed solid mass fraction decreases in the pipe with the corner dimension between the active branch pipe and the main pipe axis increasing in the experimental situation. As for the identical branch pipe, gas apparent velocity is greater than the limited, its change has little influence on solid-phase distributional characteristics; gas apparent velocity is less than the limited, its reduction makes the solid-phase mass fraction increase. Meanwhile, the paper analyzes the importance of all influencing factors for solid -phase distribution and their relationship, and concludes the corner dimension between the active branch pipe and the main pipe axis and gas apparent velocity are the main factors influencing flow distribution in Y-type branch pipe. This coincides in the experimental results.