矿粒粒径对深海采矿扬矿泵磨损特性的影响

Influence of mineral particle size on wear characteristics of deep-sea mining lifting pump

为研究矿粒粒径对深海采矿扬矿泵过流部件磨损特性的影响,采用DPM模型模拟泵内固液两相流动,并以基于流体动力学的Oka磨损模型仿真颗粒对过流部件的磨损,分析扬矿泵在不同矿粒粒径下的磨损规律.研究结果表明:随着矿粒粒径增大,首级叶轮及次级叶轮的前后盖板磨损量分布逐渐均匀,前盖板磨损量的集中区域从出口压力面向叶轮中部及进口吸力面转移,后盖板磨损量集中分布区域从进口吸力面一侧向出口压力面一侧转移,叶片进口和出口的磨损面积均逐渐增大;首级空间导叶及次级空间导叶的叶片背面进口磨损面积逐渐增大,在轮毂出口处磨损区域向外逐渐转移,且该位置磨损面积逐渐减小;当矿粒粒径从1.0 mm增大到5.0 mm时,首级叶轮和次级叶轮的前盖板最大磨损量分别上升132.9%和104.2%,首级叶轮和次级叶轮的叶片最大磨损量分别上升172.3%和142.5%,首级叶轮和次级叶轮的后盖板最大磨损量分别上升251.4%和102.3%,首级导叶和次级导叶的最大磨损量分别下降87.1%和74.3%.

In order to study the effect of particle size on the wear characteristics of overflow components of deep-sea mining lifting pump, the DPM model was used to simulate the solid-liquid two-phase flow in the pump, and the wear of particles on overflow components was simulated by the Oka wear model based on fluid dynamics to analyze the wear law of the lifting pump with different particle sizes. The results show that with the increase of particle size, the wear of the front and rear cover of the first stage impeller and secondary impeller is gradually distributed evenly, and the concentrated area of the wear of the front cover shifts from the outlet pressure surface to the middle of the impeller and the inlet suction surface, and the concentrated area of the wear of the rear cover shifts from the inlet suction surface to the outlet pressure surface, and the wear area of both the inlet and outlet of the vane gradually increases. The inlet wear of the first stage space guide vane and the secondary space guide vane is gra-dually increased. When the particle size increases from 1.0 mm to 5.0 mm, the maximum wear amount of the front cover plate of the first stage impeller and secondary impeller increases by 132.9% and 104.2%, respectively, and the maximum wear amount of the blades of the first stage impeller and se-condary impeller increases by 172.3% and 142.5%, respectively. The maximum wear of the rear cover plate of the primary and secondary impellers increases by 251.4% and 102.3%, and the maximum wear of the primary and secondary guide vanes decreases by 87.1% and 74.3%, respectively.