矿产保护与利用2025，Vol.45Issue(5)：85-92,8.DOI:10.13779/j.cnki.issn1001-0076.2025.08.020
气固分选流化床潮湿细粒煤颗粒碰撞特性及能量耗散机制
Collision Characteristics and Energy Dissipation Mechanisms of Humid Fine Coal Particles in Gas-Solid Separation Fluidized Beds
摘要
Abstract
The air dense medium fluidized bed creates a uniform and stable bed layer through ascending airflow,enabling density-based separation of coal and gangue for clean and efficient resource utilization.Moisture content critically affects separation efficiency by inducing particle adhesion during collisions,which promotes agglomeration and compromises product quality.To address this,this work investigated collision characteristics and energy dissipation mechanisms of moist particles using a particle collision adhesion visualization system.The study examined the impacts of collision velocity,particle properties,and relative humidity on three key parameters:maximum contact displacement,contact time,and energy loss.Results indicate that as collision velocity increases,the initial kinetic energy of the particles also rises;following an abrupt reduction in normal velocity to zero,rapid rebound occurs resulting in a significant increase in maximum contact displacement while reducing contact time.When the particle size increases,its elastic potential energy increases,resulting in an increase in maximum contact displacement and an extension of the contact time.Conversely,as the relative humidity increases,the enhanced liquid bridge forces result in greater collision resistance,thereby diminishing the maximum contact displacement.Additionally,variations in shapes among colliding particles contribute to discrepancies in energy consumption during collisions which affect contact times differently.Furthermore,viscoelastic losses along with those induced by liquid bridges,increase significantly with larger particle sizes and higher relative humidity;in particular,viscoelastic losses dominate these interactions.This study provides theoretical insights for optimizing fluidized bed operational parameters and mitigating agglomerate formation,while providing essential guidance for improving coal separation efficiency.关键词
空气重介质流化床/颗粒聚团/颗粒碰撞/能量损失Key words
air dense medium fluidized bed/particle agglomeration/particle collision/energy loss分类
矿山工程引用本文复制引用
张硕,蔚文朋,李卫栋,侍耕波,王宏伟,闫继武,董良..气固分选流化床潮湿细粒煤颗粒碰撞特性及能量耗散机制[J].矿产保护与利用,2025,45(5):85-92,8.基金项目
国家自然科学基金项目(52274275) （52274275）
