膏体料浆管道输送压力损失的影响因素

Influence factors of pressure loss in pipeline transportation of paste slurry

为研究膏体料浆管道输送过程中的压力损失，本文建立了新型闭路环管试验测试平台，研究了管径、料浆流速、料浆中固相含量和物料粒径对膏体料浆管道输送压力损失的影响。流速对压力损失的影响分两个阶段：当流速小于黏性过渡流速时，压力损失随流速呈线性增加；当流速大于黏性过渡流速时，压力损失随着流速增加呈1~2次多项式增加，且增加速率远大于流速增加速率。压力损失随管径增大呈负幂指数减小，随料浆中固相质量分数的增加呈指数增加。在相同工况条件下，细粒级较粗粒级料浆管输压力损失更大，且黏性过渡流速较大，压力损失随流速增加相对缓慢。

A new pipe loop test platform was built to study the influence factors and levels of pressure loss in slurry pipe transpor-tation. The influences of pipe inner-diameter, flow velocity, slurry concentration and particle size on the pressure loss were investiga-ted. It is found that the influence of flow velocity on the pressure loss can be divided into two stages： when the flow velocity is less than the viscous transition flow rate, the pressure loss increases linearly with the increasing of flow velocity;but when the flow velocity is greater than the viscous transition velocity, the pressure loss increases in linear to quadratic polynomials with the increase of flow ve-locity, and the increasing rate is greater than that of flow velocity. The pressure loss negative-power decreases with the increasing of pipe diameter, but it exponentially increases with increasing slurry concentration. Under the same working condition, the pressure loss of fine-grained slurry is greater than coarse-grained slurry, the viscous transition velocity of fine-grained slurry is larger, but the in-crease in pressure loss of fine-grained slurry with flow velocity is relatively slow.