基于离散元法的振动筛的筛分效率研究
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摘要
针对双层直线振动筛筛分工况对物料运动规律的影响不明,导致筛分机工作效率低,筛分耗时长,筛分质量差等问题,采用离散元法模拟了不同粒级颗粒在不同振幅、振动方向角、筛面倾角条件下的筛分过程.结果表明:颗粒运动速度随着振幅和筛面倾角的增大而加快.振幅越小,越有利于小颗粒筛分;当A=4mm,α=30°,β=16°时,各粒级颗粒同时达到较高筛分效率.
For the influence of screening conditions of double-deck linear vibrating screen on motion regularity of the material is indefinite,which leads to problems of low screening efficiency,poor screening quality and time-consuming of double-deck linear vibrating screen machine,authors simulated the screening process of different granularities of particles with varied amplitude,excitation angle and mesh slope based on DEM.The results showed that,particle velocity speed up with the increase of amplitude and mesh slope.It is benefit for screening of small particles with lower amplitude.Different granularities of particles achieve higher screening efficiency with A=4 mm,α=30°,β=16°.It is stable that the sort of efficiency of different granularities of particles under different parameters.
For the influence of screening conditions of double-deck linear vibrating screen on motion regularity of the material is indefinite,which leads to problems of low screening efficiency,poor screening quality and time-consuming of double-deck linear vibrating screen machine,authors simulated the screening process of different granularities of particles with varied amplitude,excitation angle and mesh slope based on DEM.The results showed that,particle velocity speed up with the increase of amplitude and mesh slope.It is benefit for screening of small particles with lower amplitude.Different granularities of particles achieve higher screening efficiency with A=4 mm,α=30°,β=16°.It is stable that the sort of efficiency of different granularities of particles under different parameters.
引文
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[19] DONG K J,YU A B.Numerical simulation of the particle flow and sievingbe haviour on sieve bend/low head screen combination[J].Miner Eng,2012,31(1):2-9.
[20] LIU C,WANG H,ZHAO Y,et al.DEM simulation of particle flow on a single deck banana screen[J].International Journal of Mining Science and Technology,2013,23(7):273-277.
[21] DONG H,LIU C,ZHAO Y,et al.Influence of vibration mode on the screening process[J].International Journal of Mining Science and Technology,2013,23(4):95-98.
[2] JAFARI A,SALJOOGHI NEZHAD V.Employing DEM to study the impact of different parameters on the screening efficiency and mesh wear[J].Powder Technology,2016,297(11):126-129.
[3] CLEARY P W,SINNOTT M D,MORRISON R D.Separation performance of double deck banana screens-part 2:quantitative predictions[J].Minerals Engineering,2009,22(14):123-128.
[4] CLEARY P W,SAWLEY M L.DEM modelling of industrial granular flows:3Dcase studies and the effect of particle shape on hopper discharge[J].Applied Mathematical Modelling,2002,26(2):89-95.
[5]邓荣根.基于离散元超细混合及粉碎的仿真[D].上海:华东理工大学,2013.
[6] WU Y,AN X,YU A.DEM simulation of cubical particle packing under mechanical vibration[J].Powder Technology,2016(2):21-23.
[7] LI Z,TONG X.A study of particles penetration in sieving process on a linear vibrationscreen[J].International Journal of Coal Science&Technology,2015,2(4):299-302.
[8] LI J,WEBB C,PANDIELLA S S,et al.Discrete particle motion on sieves—a numerical study using the DEM simulation[J].Powder Technology,2003,133(2):190-192.
[9] JAHANI M,FARZANEGAN A,NOAPARAST M.Investigation of screening performance of banana screens using LIGGGHTS DEM solver[J].Powder Technology,2015,283(1):32-37.
[10]赵啦啦,刘初升,闫俊霞,等.振动筛面颗粒流三维离散元法模拟[J].中国矿业大学学报,2010,29(3):414-416.
[11] ZHAO L,ZHAO Y,BAO C,et al.Laboratory-scale validation of a DEM model of screening processes with circular vibration[J].Powder Technology,2016,303(1):269-274.
[12]焦红光.筛分作业中颗粒同筛面间碰撞过程的数值研究[J].辽宁工程技术大学学报(增刊),2006:281-285.
[13]焦红光.用颗粒离散元法模拟筛分过程[J].中国矿业大学学报,2007,26(2):232-236.
[14] DONG K J,YU A B,BRAKE I.DEM simulation of particle flow on a multi-deck bananascreen[J].Minerals Engineering,2009,22(11):910-915.
[15] CUNDALL P.A discrete numerical model for granular assemblies[J].Geotechnique,1979,29(1):47-51.
[16] THORNTON C.Impact of elastic spheres with and without adhesion[J].Powder Technology,1991,65(1/2/3):153-159.
[17] TSUJI Y.Lagrangian numerical simulation of plug flow of cohesionless particles in a horizontal pipe[J].Powder Technology,1992,71(3):239-244.
[18] ZHAO L,ZHAO Y,LIU C,et al.Simulation of the screening process on a circularly vibrating screen using 3D-DEM[J].Mining Science and Technology,2011,21(2):677-680.
[19] DONG K J,YU A B.Numerical simulation of the particle flow and sievingbe haviour on sieve bend/low head screen combination[J].Miner Eng,2012,31(1):2-9.
[20] LIU C,WANG H,ZHAO Y,et al.DEM simulation of particle flow on a single deck banana screen[J].International Journal of Mining Science and Technology,2013,23(7):273-277.
[21] DONG H,LIU C,ZHAO Y,et al.Influence of vibration mode on the screening process[J].International Journal of Mining Science and Technology,2013,23(4):95-98.