Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

您目前所在的位置:首页 - 期刊简介 - 详细页面

中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第28卷    第10期    总第235期    2018年10月

[PDF全文下载]        

    

文章编号:1004-0609(2018)-10-2143-11
膏体料浆管道输送中粗颗粒迁移的影响因素分析
颜丙恒1, 2,李翠平1, 2,吴爱祥1, 2,王少勇1, 2,侯贺子1, 2

(1. 北京科技大学 土木与资源工程学院,北京 100083;
2. 北京科技大学 金属矿山高效开采与安全教育部重点实验室,北京 100083
)

摘 要: 含粗骨料的膏体充填料浆在管道输送时存在粗颗粒沉降堵管和管壁磨损严重的问题,但常规的管道输送实验方法难以获得粗颗粒在管道截面上径向迁移的影响因素。以颗粒在黏塑性流体中的运动规律为基础,结合膏体充填工艺的实际情况,采用数值模拟研究膏体料浆流变参数对粗颗粒迁移的影响。针对实际生产中管道直径与粗骨料颗粒直径之比λ相对较小,在颗粒-流体耦合分析时可将粗骨料颗粒视为宏观颗粒,采用宏观颗粒模型(MPM)进行数值模拟。以Bingham流体的无量纲数,即塑性黏度雷诺数Rep、宾汉姆数Bi为定量评价指标,分析充填料浆的屈服应力、塑性黏度对粗骨料颗粒迁移的影响。结果表明,对于剪切流动区域内的粗骨料颗粒,其径向迁移量与屈服应力值和宾汉姆数Bi呈反比、与塑性黏度值呈正比,在一定的黏性效应下与塑性黏度雷诺数Rep呈正比。

 

关键字: 膏体充填料浆;宏观颗粒模型;影响因素;流变参数;无量纲数

Analysis on influencing factors of coarse particles migration in pipeline transportation of paste slurry
YAN Bing-heng1, 2, LI Cui-ping1, 2, WU Ai-xiang1, 2, WANG Shao-yong1, 2, HOU He-zi1, 2

1. School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing 100083, China;
2. State Key Laboratory of High-Efficient Mining and Safety of Metal Mines, Ministry of Education, Beijing 100083, China

Abstract:The paste backfill slurry with coarse aggregate had the problems of coarse particles settlement and wall wear serious in pipeline transportation. It was difficult to analyze the influencing factors of coarse particles’ radial migration in the pipeline sections by conventional pipe flow experiments. In this work, based on the law of movement of particles in viscoplastic fluid and the actual situation of paste backfill technology, the influence of rheological parameters of paste slurry on coarse particles’ law of migration was studied by numerical simulation. For actual production, the ratio λ of pipe diameter to coarse aggregate particles diameter was relatively small, coarse aggregate particles could be regarded as macroscopic particles in particle-fluid coupling analysis, and the Macroscopic Particle Model (MPM) was used for numerical simulation. Taking the dimensionless numbers of Bingham fluid, i.e., plastic viscosity Reynolds number Rep and Bingham number Bi as quantitative evaluation indexes, the influence of yield stress and plastic viscosity of backfill slurry on coarse aggregate particles’ law of migration was analyzed. The results show that the radial migration of coarse aggregate particles in the shear flow region is inversely proportional to the yield stress value and Bingham number Bi, is directly proportional to the plastic viscosity value, and is directly proportional to the plastic viscosity Reynolds number Rep under a certain viscous effect.

 

Key words: paste backfill slurry; macroscopic particle model; influencing factors; rheological parameter; dimensionless numbers

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

主管:中国科学技术协会 主办:中国有色金属学会 承办:中南大学
湘ICP备09001153号 版权所有:《中国有色金属学报》编辑部
------------------------------------------------------------------------------------------
地 址:湖南省长沙市岳麓山中南大学内 邮编:410083
电 话:0731-88876765,88877197,88830410   传真:0731-88877197   电子邮箱:f_ysxb@163.com