不同角度弯管输送料浆不淤流速的研究

为了研究煤矸石充填料浆在不同角度弯管中不淤流速的变化, 采用Fluent软件模拟了充填料浆在管道内的输送过程, 分析了煤矸石料浆在各角度弯管中的流速特征、管道出口截面处的矸石颗粒沉降状况, 由此得出了不同入口速度下料浆在不同角度弯管中的不淤流速。结果表明, 料浆在75°、90°和105°弯管中的不淤流速分别为1.8 m/s、1.7 m/s和1.5 m/s, 即料浆的不淤流速随弯管角度增大而减小;弯管角度越大, 料浆在弯管中的阻力作用越小, 则料浆流速越快, 使得矸石颗粒的沉降有所缓解。

Critical Nonsilting Velocity of Slurry in Transportation Pipe with Different Bend Angles

In order to study the nonsilting velocity of coal gangue-based backfilling slurry in pipes with different bend angles, Fluent software was used to simulate the transportation process of the slurry in a bended pipe, and the flow velocity characteristics of coal gangue-based slurry in  bended pipe with different angles and the settling of the gangue particles in the cross section of the pipe outlet were all analyzed. Based on that, the nonsilting velocities in bends with different angle were obtained for the slurry with different initial feeding speed in the inlet. It is found that the nonsilting velocity for the slurry in the bends with angles of 75°, 90° and 105° are 1.8 m/s, 1.7 m/s and 1.5 m/s, respectively, meaning that nonsilting velocity of  slurry decreases with the increase of the bending angle. A bend with larger angle will bring in smaller drag force on the particles, leading to a faster velocity of  slurry, which can alleviate the settling of gangue particles.