Research On DEM Simulation Of Vibrated Spiral Dry Separation

Based on the stated background and significance, DEM simulation of vibrated spiral dryseparation is conduted with EDEM software in this thesis.Firstly the development status of major dry coal preparation techniques and equipments isreviewd, and then the previous research findings of vibrated spiral dry separator are summarized.In addition, DEM (Discrete Element Method) and related software named EDEM (Expert inDiscrete Element Method) are introduced. Meanwhile, the feasibility and advantage of designoptimization of vibrated spiral dry sperator using EDEM simulation is discussed.The dynamic model of vibrated spiral dry separator is established in this thesis. Thecalculation formula and influential factors of vertical amplitude and torsional amplitude is putforward respectively, which provide a theoretical support for subsequent simulation experiment.3D model of vibrated spiral dry separator is built using a kind of3D modeling software namedSolidWorks base on the physical prototype structure.3D models of particles are similarly builtaccording to the prototype material particles and research needs. These3D models providelifelike solid models for subsequent simulation experiment. According to the built-in operationorder of EDEM namely Creator, Simulator and Analyst, all the operation parameter settlings andoperation steps are finished. Hereafter the simulation is conduted and required datas anddiagarams are obtained.Five main factors influence the separation performance of vibrated spiral dry separator areselected to conduct some in-depth researches respectively. By analyzing and optimizing all thedata and diagrams obtained from simulation experiment, several optimized parameterscorresponding to the best separation performance are given as follows: firstly, valuing motorvibration frequency f as35Hz, secondly, valuing vertical amplitude λ as2.0mm, thirdly, valuinghorizontal torsional amplitude φ as0.14°. Meanwhile, article propounds several implementingmeasures and feasible advice about the unitarity between λ and φ. These measures and adviceprovide some practicable methods for design optimization of main structure parameters.Pitch T (tangential angle α) and radial inclination β are two main structure parameters ofhelix bed. EDEM simulation analysis result is used to study T and β and results of ADAMSsimulation is given in comparison, and then comprehensive analysis of the obvious phenomenonduring simulation experiment is made. Finally, it is considered more appropriate that valuingpitch t as350mm, and it is reasonable that valuing radial inclination β as0°under the premisethat there are lattice bars on the helix bed. This result provides constructive guidance for designoptimization of main structure parameters. EDEM simulation, a kind of groundbreaking method, is applied in design optimization ofvibrated spiral dry separator. This kind of research mentality and method is considered moreadvanced and original as far. It helps to obtain a series of valuable data and diagrams and enjoyslots of advantages such as lower cost, shorter period, simple operation and high efficiency. Thismethod has a positive significance for the optimized design of main structure parameters.Meanwhile it shows that simulation analysis has practical significance and worthyrecommending during developing and repairing equipments as vibrated spiral dry separator.