摘要
粗颗粒含量会显著影响充填料浆的流变特性和管道输送性能。本文对含不同矸石粗颗粒的矸石浆液开展了流变特性测试,并在此基础上进行了管道输送特性数值模拟。试验和数值模拟结果表明:随着矸石粗颗粒含量增加,细矸石粉颗粒自絮凝形成的絮网结构强度减弱,致使矸石浆液的屈服应力和塑性黏度降低。在管道输送期间,矸石浆液由不稳定流逐渐向结构流过渡,较多的粗颗粒含量诱导结构流的形成时间向后推移。此外,粗颗粒含量显著影响矸石浆液的体积分数分布,含较少粗颗粒的矸石浆液均质性更高,而过多的粗颗粒则导会致管道底部淤积、聚集大量颗粒,浆液的均质性明显降低易引发堵管事故。依据压力降获得的矸石浆液沿程阻力损失随粗颗粒含量的增加而降低。综合考虑粗颗粒对矸石浆液流变性、稳定性、体积分数分布和沿程阻力损失的影响,推荐粗颗粒含量应不高于30%。
The coarse particle content can significantly affect the rheological properties and pipeline transport performance of the filling slurry.In this paper,the rheological characteristics of the gangue slurry containing different gangue coarse particles were tested,and the numerical simulation of the pipe transport characteristics was carried out on this basis.Test and numerical simulation results show that:with the increase of gangue coarse particles,fine gangue powder particles since the formation of the flocculation network structure strength weakened,resulting in the gangue slurry yield stress and plastic viscosity reduced.During the pipeline transmission,the gangue slurry gradually transitioned from unstable flow to structural flow,and the higher coarse particle content induced the formation time of structural flow to be pushed back.Moreover,the coarse particle content significantly influenced the volume fraction distribution of the gangue slurry.The homogeneity of the gangue slurry containing less coarse particles was higher,while too much coarse particle content led to the accumulation of a large number of particles at the bottom of the pipe,and the homogeneity of the slurry was significantly reduced and prone to plugging accidents.The resistance loss of the gangue slurry obtained based on the pressure drop decreased with the increase of coarse particle content.Comprehensive consideration of coarse particles on gangue slurry rheology,stability,volume fraction distribution and resistance loss,the recommended coarse particle content should not be higher than 30%.
作者
程磊
肖刚
王丹影
高卫卫
贺军
王石
CHENG Lei;XIAO Gang;WANG Danying;GAO Weiwei;HE Jun;WANG Shi(Shaanxi Coal Industry Company Limited ofCaojiatan,Yulin 719000,China;China Coal Land Ecological Environment Technology Co.,Ltd,Beijing 100070,China;School of Resources&Environment Engineering,Jiangxi University of Science and Technology,Ganzhou 341000,China)
出处
《洁净煤技术》
CAS
CSCD
北大核心
2024年第S02期634-640,共7页
Clean Coal Technology
关键词
粗颗粒
矸石
流变
沿程阻力损失
数值模拟
coarse particles
gangue
rheology
frictional resistance loss
numerical simulation
