Prediction of medium-to-coal ratio effect in a dense medium cyclone by using both traditional and coarse-grained CFD-DEM models

作     者：Zhaoyang Li Kaiwei Chu Zongqing Zhou Yixiong Feng Aimin Wang Zhaoyang Li;Kaiwei Chu;Zongqing Zhou;Yixiong Feng;Aimin Wang

作者机构：School of Mechanical EngineeringZhejiang UniversityHangzhou 310027China School of Qilu TransportationShandong UniversityJinan 250002China Shandong Iron and Steel Group Co.Ltd.Jinan 250101China State Key Lab Fluid Power&Mechatron SystZhejiang UniversityHangzhou 310027China4.Hengda Fuji Elevator Co.Ltd.Huzhou 313009China JITRI Institute for Process Modelling and OptimizationSuzhou 215123China 

出 版 物：《Particuology》 (颗粒学报（英文版）)

年 卷 期：2022年第20卷第9期

页      面：44-56页

核心收录：

学科分类：081901[工学-采矿工程] 0819[工学-矿业工程] 08[工学] 

基　　金：the financial supports provided by Shandong University,Northwestern Polytechnical University Laboratory Open Fund(grant No.6142701200203) Shandong Provincial Natural Science Foundation,(grant No.ZR2020ME107),Natural Science Foundation of Jjiangsu Province(grant No.BK20180287) China Association for Science and Technology"Young Talent Support Project" 

主　　题：Dense medium cyclone Medium-to-coal ratio Discrete element method Computational fluid dynamics Low-density coal tail 

摘      要：Dense medium cyclone(DMC)is the working horse in coal *** practice,it is usually operated under constant pressure and the operational conditions(mainly medium-to-coal(M:C)ratio and oper-ational pressure)need to be adjusted according to coal washability data(mainly coal particle size and density distributions).Nonetheless,until now it is still not well understood how the M:C ratio would affect the performance of DMCs especially under the practical *** this work,the effect of M:C ratio is for the first time numerically studied under conditions similar to plant operation by using both tra-ditional and coarse-grained(CG)combined approach of computational fluid dynamics(CFD)and discrete element method(DEM),called as traditional CFD-DEM and CG CFD-DEM,in which the flow of coal par-ticles is modelled by DEM or CG DEM which applies Newton s laws of motion to individual particles and that of medium flow by the conventional CFD which solves the local-averaged Navier-Stokes equations,allowing consideration of particle-fluid mutual interaction and particle-particle ***,impulse and momentum connection law is used to achieve energy conservation between traditional CFD-DEM and CG *** is found that under constant pressure,the M:C ratio affects DMC perfor-mance *** specific effect depends on coal washability or coal *** extremely low M:C ratio,the phenomenon that high-quality coal product is misplaced to reject is successfully repro-duced,which has been observed in plants in Australian coal industry and called aslow-density tail.Moreover,strategies are proposed to mitigate thelow-density tailphenomenon based on the model.