长条状粗颗粒在垂直管路中最小输送速度试验研究  

Experimental study on minimal transporting velocity of long particles in vertical pipeline

作　　者：符瑜 肖红[2] 夏建新[1] FU Yu;XIAO Hong;XIA Jianxin(College of Life and Environmental Sciences, Minzu University of China, Beijing 100081, China;State Key Laboratoryof Exploitation and Utilization of Deep-Sea Mineral Resources,Changsha Research Institute of Mining and Metallurgy Co., Ltd.,Changsha 410012, China)

机构地区：[1]中央民族大学生命与环境科学学院,北京100081 [2]长沙矿冶研究院有限责任公司深海矿产资源开发利用技术国家重点实验室,湖南长沙410012

出　　处：《海洋工程》2019年第4期63-69,共7页The Ocean Engineering

基　　金：国家自然科学基金资助项目(51339008;51434002;51209238)

摘　　要：随着陆地金属资源的日益枯竭,深海矿产资源已经成为各国的重要战略目标。在深海采矿过程中,海底锰结核的形状除了圆球状,还有长条状等,颗粒形状对固液两相流管道输送特性具有很大影响。基于固液两相流垂直管道提升输送试验系统,探究不同工况下长条状颗粒在垂直上升流中最小输送速度的变化规律及特性,并得到了长条状群体颗粒最小输送速度计算公式。结果表明:长条状颗粒在垂直管道中上升过程中,颗粒中心轴与输送方向趋向于垂直,使颗粒在管道截面的投影面积最大化;长条状单颗粒的最小输送速度随着颗粒长径比增大而减小;在不同长径比工况下,随着管段颗粒平均浓度减小,长条状群体颗粒的最小输送速度均增大,且随着长径比增大,群最小输送速度减小。The focus of international competition is gradually shifted to the strategic resources of sea with decreasing land resources of the countries concerned, so deep-sea mining resources have become an important strategic target.In deep sea mining, the shape of the manganese nodule is not only globular, but also long-shaped and so on.Particle shape has great influence on the pipeline transportation characteristics of solid-liquid two phase flow.Based on the solid- liquid two phase flow vertical pipeline lifting and conveying test system, the characteristics of minimal transporting velocity of long-shaped particles in vertical upward flow under different working conditions are studied.And the formula for calculating the minimal transporting velocity of group long-shaped particles is obtained.The results are concluded as follows:During the ascending process of long-shaped particles in the vertical pipeline, the central axis of particles tends to be perpendicular to the conveying direction, which maximizes the projected area of the particles in the pipeline section.The minimal transporting velocity of the single long-shaped particle decreases with the increase of the long-shaped particle s length-diameter ratio.The minimal transporting velocity of the group long-shaped particles increases with the decrease of average volume concentration in pipe section under different length-diameter ratio conditions.With the increase of the length- diameter ratio, the minimal transporting velocity of the group long-shaped particles decreases.

关 键 词：长条状颗粒 垂直管道 输送 最小输送速度 长径比 

分 类 号：P751[交通运输工程—港口、海岸及近海工程]