Motion pattern of aged municipal solid waste in trommeland optimization of screening efficiency
Han KE1,2(),Sheng-ze LAN1,2,Mei-lan ZHANG3,Jie HU1,2,*(),Xing XU1,2,Yun-min CHEN1,2
1. MOE Key Laboratory of Soft Soils and Geoenvironmental Engineering, Zhejiang University, Hangzhou 310058, China 2. Institute of Geotechnical Engineering, Zhejiang University, Hangzhou 310058, China 3. Shanghai Laogang Waste Disposal Limited Company, Shanghai 201302, China
The motion equation of municipal solid waste (MSW) in trommel was derived and solved numerically. The MSW motion pattern was divided into three categories according to the maximum position angle: cascade action, cataract action and circular action. The discriminant contour maps of the motion pattern under different rotating speed, radius and kinetic friction coefficient were given. The Trommel experiments indicate that the maximum position angle of the MSW motion increases first, and then stays stable with the increase of the rotating speed. The MSW enters circular action after the rotating speed reaches 50 r/min. The screening efficiency of trommel increases at first and then decreases with the increase of rotating speed, continues to increase with the increase of drop, and decreases with the increase of water mass fraction. The contour map of the optimal rotational speed with the trommel was given based on the experiment results. In specific projects, optimal rotating speed can be selected according to the kinetic friction coefficient of MSW and the trommel radius, and the water mass fraction should be reduced to improve the screening efficiency.
Han KE,Sheng-ze LAN,Mei-lan ZHANG,Jie HU,Xing XU,Yun-min CHEN. Motion pattern of aged municipal solid waste in trommeland optimization of screening efficiency. Journal of ZheJiang University (Engineering Science), 2021, 55(12): 2323-2333.
Tab.1Motion characteristics of different motion patterns of materials in trommel
Fig.1Three motion patterns of materials in trommel
Fig.2Force analysis of material on trommel circumference
阶段
δ
au
aD
aT
vTs
运动控制方程
I
0°~δ0
μ (gcos δ+v2/R)
gsin δ
>0
0
x=F1(t)
II
δ0~δ1
aS
gsin δ
0
2πntR
x=xδ0+vδ0(t)
III
>δ1
μ (gcos δ+v2/R)
gsin δ
<0
2πntR
x=F1(t)
Tab.2Motion phase table when trommel rotational speed is not enough
Fig.3Numerical solutions of MSW motion in standard case
Fig.4Relationship between position angle and friction coefficient in standard case
Fig.5Numerical solution of MSW motion when trommel rotational speed is not enough in general case
Fig.6Contour map of maximum angle and motion pattern
Fig.7Product photo of trommel
Fig.8Particle size distribution of aged MSW
Fig.9Recording method of maximum angle in laboratory tests
Fig.10Screening material and products
Fig.11Relation between maximum angle and trommel rotational speed
Fig.12Relation between screening efficiency and trommel rotational speed
Fig.13Relation between screening efficiency and drop function
Fig.14Optimal rotational speed value of figure for trommel
Fig.15Relation between screening efficiency and water mass fraction
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