深海矿产矿浆泵矿石颗粒回流性能

Ore particle backflow performance in the deep-sea mining slurry pump

针对深海采矿矿浆泵回流较差的问题,本文使用计算流体力学-离散元方法(CFD-DEM)方法,计算球形颗粒在某型矿浆泵单级和两级叶轮导叶内的回流,混合粒径颗粒回流以及非球形颗粒的回流情况。颗粒群在单级叶轮导叶回流时,由于不同导叶叶片与叶轮叶片之间的相对位置差异,不同导叶流道内颗粒群的回流情况不同;颗粒群的回流情况与叶轮导叶的形状有关,高比转速小包角叶片的设计更有利于颗粒回流。颗粒群在两级叶轮导叶内回流时,次级叶轮导叶内颗粒流动情况与单级基本相同,但首级不同导叶流道内的颗粒分布既受到首级叶轮导叶叶片相对位置的影响,还与首级导叶叶片和次级叶轮叶片的相对位置有关。混合粒径颗粒群的回流能力要弱于单一粒径,不同粒径颗粒在不同级叶轮导叶内通过时间也有所差异。相对于球形颗粒,非球形颗粒回流性能要差很多,增大了可回流矿浆泵的设计难度。

To deal with the problem of poor backflow performance of ore particles in the deep-sea mining slurry pump,the computational fluid dynamics-discrete element method(CFD-DEM)is used to calculate the reflux of spherical particles in a certain slurry pump with single-stage and two-stage impeller guide vanes and reflux of homogenous and nonhomogeneous nonspherical particles.Due to the different relative positions of guide vane and impeller blades,the reflux of particle groups in different guide vane passages is different for the single-stage impeller guide vane.The reflux of particle groups is relative to the shape of the impeller guide vane,and the high rotary speed and small blade size are conducive to particle reflux.When the particles flow back into the pump with two-stage impeller guide vane,the flowing of particles in However,the distribution of particles in different guide vanes in the first stage is not only affected by the relative positions of the guide vane blades in the first stage impeller but also related to the relative positions of the guide vane blades of the first stage impeller and the blades in the secondary impeller.The reflux ability of nonhomogeneous particles is weaker than that of the homogenous particles,along with different passing times in the two stages.The reflux performance of nonspherical particles is inferior to that of the spherical particles,further increasing the difficulty in designing the slurry pump.