海底多金属硫化物集矿过程固液两相流数值模拟研究

Numerical simulation of solid-liquid two-phase flow of the gathering process of seafloor massive sulfide

基于螺旋滚筒破岩工作特点,建立多金属硫化物集矿抽吸流场模型,利用Fluent软件对多金属硫化物集矿过程的固液两相流动进行数值模拟,分析矿物初始运动状态、矿物粒径、抽吸管道结构参数、抽吸水流速度等对抽吸性能的影响。研究结果表明:对多金属硫化物进行收集时应尽量提高多金属硫化物的初始运动速度;矿物粒径越大抽吸难度越大,应控制矿物粒径在10~30 mm范围内;抽吸管道直径与抽吸完成率呈正相关,综合考虑抽吸完成率和抽吸浓度,建议抽吸管道内径为150 mm,并加装导流罩;抽吸水流速度与抽吸完成率呈正相关,但抽吸水流速度不是越大越好,综合考虑抽吸效率与能耗,建议抽吸水流速度取值范围为7~8 m/s。

A suction flow field model of seafloor massive sulfide agglomeration was established based on the working characteristics of the spiral drum.Fluent software was used to simulate the solid-liquid two-phase flow in the seafloor massive sulfide gathering process,and the effects of the initial mineral movement state,mineral particle size,suction pipe structure parameters,and suction water flow velocity on the suction performance were analyzed.The results show that when collecting seafloor massive sulfide,the initial movement speed of seafloor massive sulfide should be increased as much as possible;the larger the particle size of the mineral is,the more difficult it is to pump.In order to facilitate the collection of polymetallic sulfides,the particle size of minerals should be controlled in the range of 10-30 mm.The diameter of suction pipe is positively correlated with the suction completion rate.Considering the suction completion rate and concentration comprehensively,it is recommended that the inner diameter of suction pipe be 150 mm and the diversion hood be installed.The suction flow rate is positively correlated with the suction completion rate.The suction water is not the faster the better.Considering the suction efficiency and energy consumption comprehensively,it is suggested that the suction flow speed range be 7-8 m/s.