论文部分内容阅读
以压缩空气为输送动力,粒径相同而密度不同的小米和空心玻璃珠为输送物料,在水平变角度Y形分支管气力输送试验台上对气固两相分支管道的阻力特性进行了研究。试验结果表明,在保持发送压力恒定条件下,当气体表观速度下降时,两分支管的单位长度压力损失减小;但气体表观速度低于沉积速度后,继续降低气速,各支管单位长度压损将增大。当两分支管与主管中心线夹角相同时,不论在气体高速区还是在低速区,两分支管道的阻力特性曲线相近。当两分支管与主管中轴线夹角的差值变大时,两分支管阻力特性曲线在气体高速区远离,在低速区靠近或出现交叉。同时得出,在相同的流动情况下,密度较大的固体颗粒压力损失较大。
The resistance characteristics of gas-solid two-phase branched pipelines were studied on the pneumatic conveying test rig with variable-angle Y-shaped branches, using compressed air as conveying power, millet and hollow glass beads with the same particle size and different densities as conveying materials. The experimental results show that under the condition of constant sending pressure, when the apparent velocity of gas decreases, the pressure loss per unit length of the two branch pipes decreases. However, after the apparent velocity of gas is lower than the deposition rate, the gas velocity continues to decrease. Pressure loss will increase. When the two branch pipe and the center line of the same angle, both in the high-speed gas zone or in the low-speed zone, the two branch pipe resistance characteristics similar. When the difference between the two branch pipes and the central axis of the main pipe becomes larger, the characteristic curve of the two branch pipes is far away from the gas high-speed zone and crosses or crosses in the low-speed zone. At the same time, it is concluded that under the same flow conditions, the pressure loss of solid particles with larger density is larger.