A comparative study on design standards of screw conveyors in China,Germany,and the USA-Part Ⅱ:Discrete element method  

作　　者：Yuan Tan Michael Rackl Weijie Yang Johannes Fottner Wenjun Meng Stephan Kessler 

机构地区：[1]Technical University of Munich,Chair for Materials Handling,Material Flow,Logistics,Garching,Germany [2]Ibracon–Ingenieurbüro Dr.-Ing.Rackl,Zorneding,Germany [3]School of Mechanical Engineering,Taiyuan University of Science and Technology,Taiyuan,China

出　　处：《Particuology》2024年第9期113-125,共13页颗粒学报（英文版）

基　　金：the European Union's Horizon 2020 Program(H2020/2014–2020);under grant agreement No.654446.

摘　　要：This part of the study aims to evaluate the advantages and disadvantages of technical standards of screw conveyors in China,Germany,and the USA for industrial applications.The source or determination method of empirical coefficients as well as the theoretical foundation of dimensioning-relevant diagrams in these standards is not explicitly documented in the literature.Therefore,instead of less efficient on-site tests,the numerical simulation by discrete element method is conducted.Based on the geometrical and operational designs determined in three standards for horizontal,slightly inclined,and vertical conveyance of three representative bulk solids(barley,lignite,and sand),the potential influencing factors are discussed.With constant particle and contact parameters,the potential deviations caused by particle models are eliminated.Furthermore,the accuracy of power consumption calculation of each standard and the divergence between accessible and required mass flows is comprehensively assessed based on the analysis of simulated outcomes.Two main conclusions are drawn:(1)Particle fall back is barely considered by all three standards and leads to overestimated mass throughput;(2)The decrease in mass throughput caused by an increasing degree of filling can be compensated by slowing down the rotational speed.

关 键 词：Discrete element method Design standard Screw conveyor Screw auger Bulk solid 

分 类 号：TH224[机械工程—机械制造及自动化]