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International Journal of Mining and Geo-Engineering، جلد ۵۹، شماره ۳، صفحات ۲۹۹-۳۱۳
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عنوان انگلیسی Numerical investigation on the effect of roller screen operating parameters on the mechanical behavior of its rolls in classification of green iron ore pellets through coupled DEM-FEM simulation
چکیده انگلیسی مقاله The operational parameters of the roller screen substantially affect the efficiency and mechanical performance of its components, particularly those of the rolls. This study presents, for the first time, extensive coupled simulations employing the discrete element method-finite element method (DEM-FEM) to examine the effects of operating parameters on the mechanical behavior of rolls. This is achieved through the utilization of a realistic geometric model of the green pellets in conjunction with a hysteretic spring elastic-plastic contact model. The investigation revealed that decreasing the undersize gap from 9.75 mm to 9 mm led to increases of 20.27%, 29.71%, and 102.91% in the average force, total deformation, and equivalent stress exerted on the rolls, respectively. Furthermore, coupled DEM-FEM simulation tests of an industrial-scale roller screen were conducted for the first time, and the results obtained were compared with those from laboratory tests. The average force acting on the rolls of the laboratory roller screen was measured at 2.43 N. In contrast, simulations of a full-scale roller screen operating at capacities of 120 t/h and 200 t/h revealed average forces of 34.46 N and 54.06 N, respectively. The average total deformation observed in the rolls of the laboratory roller screen was measured at 4.27E-05 mm. In contrast, under industrial conditions, this deformation increased significantly to 1.89E-02 mm at a processing capacity of 120 t/h, and further escalated to 2.95E-02 mm at a capacity of 200 t/h
کلیدواژه‌های انگلیسی مقاله Coupled DEM-FEM simulation,Equivalent Stress,Green pellets,Industrial-scale roller screen,Total deformation
نویسندگان مقاله Mehrshad Asghari |
School of Mining Engineering, College of Engineering, University of Tehran.

Mohammad Noaparast |
School of Mining Engineering, College of Engineering, University of Tehran.

Mohamamd Jahani Chegeni |
Faculty of Mining, Petroleum & Geophysics Engineering, Shahrood University of Technology, Shahrood, Iran.

نشانی اینترنتی https://ijmge.ut.ac.ir/article_103705_940bba4f49b61abdd2ce65f528fe620e.pdf
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