气固两相管道输送分支流动阻力特性的研究

Resistance Properties of Gas-solid Two-phase Branch Pipeline Flow

在水平T型分支管道中用压缩空气对平均粒径为0.5mm砂石进行了气力输送试验,对气固两相分支管道输送的阻力性能进行了研究。试验结果表明,在发送压力基本保持不变的情况下,当输送气速下降时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,单位长度压差下降趋势减缓,其中局部阻力相对较大的分支管路则开始增大。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,局部阻力较大的分支管路的临界速度增大。

The resistance properties of gas-solid two-phase branch pipeline flow was introduced. The pneumatic conveying experiment of average particle diameter 0.5mm sand is carried out using compress air at horizontal tee branch pipe. The result shows： on condition that the systemic operation pressure keep to a constant value, when the conveying velocity begin to be less and less, the respective unit length pressure drop of the branch pipe gradually declines at first, but when the conveying velocity reduces to some extent, the pressure drop descends with a slower speed, moreover, the pressure drop of the branch pipe with a relatively more local resistance, even begins 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 critical velocity begin to heighten for the branch pipe with a more local resistance.