矿石颗粒垂直水力提升管道内的水力梯度分析

ANALYSIS OF HYDRAULIC GRADIENT IN VERTICAL HYDRAULIC LIFTING PIPELINE OF MINERAL PARTICLES

  • 摘要: 深海采矿水力提升管道内的水力梯度是管线设计时的关键参数,同时影响着管道的输运效率和运行安全。使用计算流体动力学与离散元(CFD-DEM)双向耦合方法对矿石水力输送过程进行模拟,经过与实验数据对比验证,该方法的精度较高。管道内水力梯度由三部分组成:输送介质阻力、矿石颗粒重力、矿石管壁碰撞阻力。分别推导了三种阻力的计算方法,总水力梯度计算结果与数值结果吻合良好。此外,进一步探讨了三种阻力的占比及影响因素。

     

    Abstract: Hydraulic gradient is a key design parameter for the design of a vertical hydraulic lifting pipeline system of deep-sea mineral particles, affecting the transportation efficiency and safety of the pipeline system. The present work simulates the hydraulic transportation process of mineral particles using the computational fluid dynamics coupled with the discrete element method (CFD-DEM), which is fully verified by the comparison with the experimental data. The total hydraulic gradient is divided into three parts: the friction of the carrier fluid, the gravity of the mineral particles, and the resistance caused by particle-wall collision. Each part of the hydraulic gradient is derived and compared with the CFD-DEM results. In addition, the proportion and influencing factors of each part are discussed in detail.

     

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