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| 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 |
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Abstract 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.
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Received: 02 January 2021
Published: 31 December 2021
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| Fund: 国家重点研发计划资助项目(2019YFC1806000)；国家自然科学基金资助项目(52108348)；老港综合填埋场可持续填埋研究和工艺示范资助项目(2018-C/LG-104)；中国博士后科学基金资助项目(2021M692836) |
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Corresponding Authors:
Jie HU
E-mail: boske@126.com;hujie1993@zju.edu.cn
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陈垃圾滚筒筛运动模式与筛分效率优化
推导陈垃圾在滚筒筛中的运动方程并求数值解，按最大位置角将陈垃圾运动模式划分成滚落、抛落、圆周运动，给出不同筛筒转速、半径、动摩擦因数下的运动模式判别云图. 滚筒筛试验结果显示，陈垃圾运动的最大位置角随转速的升高先增大后不变，转速超过50 r/min后垃圾进行圆周运动. 陈垃圾滚筒筛的筛分效率随转速增大呈先升后降的趋势，随抛落差的增大呈持续上升的趋势，随着原料水的质量分数的增加呈下降的趋势. 基于试验结果，给出滚筒筛最优转速取值云图，在实际工程中可根据垃圾动摩擦因数及滚筒半径选择最优转速，同时减小水的质量分数以提高筛分效率.
关键词：
滚筒筛,
运动模式,
最大位置角,
最优转速,
筛分效率
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