基于骨料运移的高浓度充填管道磨损机制
Wear mechanism of high-concentration filling pipeline based on aggregate migration
王小林 1郭进平 1吴爱祥 2王洪江 2李泽峰1
作者信息
- 1. 西安建筑科技大学 资源工程学院,西安 710055
- 2. 北京科技大学 土木与资源工程学院,北京 100083
- 折叠
摘要
高浓度充填管道磨损威胁矿山安全,但磨损机制尚不明析.采用CFD-DEM模拟高浓度充填管道磨蚀、骨料运移、骨料与管壁接触,结合理论分析和现场实测揭示管道磨损机制.结果表明:料浆承载力充足时,固液两相在管内呈柱塞流,骨料向管道中心运移,管壁处形成减磨滑移层,管道四周磨损较均匀;反之,骨料在管底呈滑动床,管底磨损最严重.滑动床对管壁的作用力是柱塞流时的2.46～2.76倍,管底磨损是柱塞流时的1.48倍.骨料在管壁附近的运动轨迹类似波形线,以小角度接触管壁并滑滚,对管壁的切向力是法向力的27.44～30.84倍,管壁磨损受骨料切向刮擦主导.非稳态输送、粗糙管壁和过高浓度会劣化滑移层的减磨效果.根据模拟结果提出六条磨损防控措施,可供相关矿山借鉴.
Abstract
The wear of high-concentration filling pipelines poses a hazard to mine safety,but the underlying wear mechanism remains unidentified.CFD-DEM coupling method was used to simulate the abrasion of high-concentration filling pipeline,as well as the aggregate migration,the contact between aggregate and pipe wall,and the wear mechanism of filling pipeline was revealed by theoretical analysis and in-situ test.The results indicate that when the slurry supporting capacity is sufficient,the solid-liquid phase in the pipeline exhibits a plug flow,the aggregate migrates to the center of the pipeline,anti-friction slip layer is formed on the pipe wall,and wear around the pipeline is uniform;on the contrary a sliding bed is formed by the aggregates at the bottom of the pipeline,and the wear of pipe bottom is significantly higher than that of other positions.The force exerted by the sliding bed on the pipe wall is 2.46 to 2.76 times greater than that of plug flow,and the wear on the bottom of the pipeline under a sliding bed is 1.48 times greater than that under plug flow.The trajectory of the aggregates near the pipe wall exhibits a waveform pattern,with the aggregates making sliding movements while contacting the pipe wall at a small angle.The tangential force exerted by the aggregates on the pipe wall is 27.44 to 30.84 times greater than their normal force,indicating that pipe wear is primarily caused by tangential scraping from aggregates.Unsteady transportation,rough pipe wall and excessive slurry concentration will degrade the wear reduction effect of the slip layer.Based on the simulation results,six measures for preventing and controlling wear are proposed,which can serve as a reference for related mines.
关键词
高浓度充填/管道磨蚀/骨料运移/磨损机制/CFD-DEM模拟/磨损防控Key words
high-concentration filling/pipe abrasion/aggregate migration/wear mechanism/CFD-DEM simulation/wear prevention and control引用本文复制引用
基金项目
陕西省博士后科研项目(2023BSHYDZZ142)
国家自然科学基金资助项目(51834001)
出版年
2024
NETL
NSTL
万方数据