COMPUTATIONAL FLUID DYNAMICS MODELING OF A DENSE MEDIUM CYLINDRICAL SEPARATOR - TRIFLO MODEL (Rapporti tecnici, manuali, carte geologiche e tematiche e prodotti multimediali)

Type
Label
  • COMPUTATIONAL FLUID DYNAMICS MODELING OF A DENSE MEDIUM CYLINDRICAL SEPARATOR - TRIFLO MODEL (Rapporti tecnici, manuali, carte geologiche e tematiche e prodotti multimediali) (literal)
Anno
  • 2013-01-01T00:00:00+01:00 (literal)
Alternative label
  • Girolamo Belardi, Gianni Schena, Marzio Piller, Jure Mencinger, Lorenzo Bozano, Paolo Bozzano, Stefano Bozzano, Eugenio Careglio (2013)
    COMPUTATIONAL FLUID DYNAMICS MODELING OF A DENSE MEDIUM CYLINDRICAL SEPARATOR - TRIFLO MODEL
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Girolamo Belardi, Gianni Schena, Marzio Piller, Jure Mencinger, Lorenzo Bozano, Paolo Bozzano, Stefano Bozzano, Eugenio Careglio (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#supporto
  • CD-Rom (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • Environmental Geology and GeoEngineering Institute (IGAG) National Research Council Area della Ricerca di Roma RM 1 - Montelibretti Via Salaria Km 29,300 C.P. 10 00015 Monterotondo Stazione - ROME University of Trieste Department of Civil Engineering and Environment Engineering, 34127 Trieste University of Ljubljana, Faculty of Mechanical Engineering (FME), 1000 Ljubljana, Slovenia ECOMIN S.r.l., Via di Francia, 54R, 16149 - GENOVA, Italy (literal)
Titolo
  • COMPUTATIONAL FLUID DYNAMICS MODELING OF A DENSE MEDIUM CYLINDRICAL SEPARATOR - TRIFLO MODEL (literal)
Abstract
  • Dense medium cyclones (DMCs) and Cylindrical Dynamic Separators (CDS) are used especially in dense medium separation processes. These are especially DMCs are high-tonnage devices that have been widely used for more than 50 years to upgrade run-of-mine coal in the 50-0.5 mm size range. For hard-to-clean coal (+10% near gravity material) in the size range of 50-0.5 mm, DMCs are very effective. DMCs operate with a very fine (<30 µm) high density solid such as magnetite or ferro-silicon (known as the medium) mixed into the feed which has the effect of increasing the apparent fluid density and the cut density is controlled by adjusting the medium concentration. The Tri-Flo is a multistage, dense-medium dynamic separator consisting of two or more cylindrical compartments connected through an axial orifice . Each compartment has an involute medium inlet and a sink outlet to produce less turbulence than simpler straight tangential counterparts. The swirling turbulent flow, the presence of medium and coal and the air-core make the flow in Triflo as such as in DMCs and CDSs complex and this has led designers to rely on empirical equations for predicting the equipment performance. These empirical relationships are derived from an analysis of experimental data and include the effect of operational and geometric variables. However, empirical models can only be used within the range of the experimental data from which the model parameters were determined. Further empirical models give no indication as to why changes in DMC and CDS geometry influence separation behavior in any fundamental sense. In view of these shortcomings, simulation and design of Triflo separator more fundamentally by computational fluid dynamics (CFD) is of considerable interest. The aim of this project is the development of proper fluidodynamic model and its implementation within the computational fluid dynamics (CFD) software, making it possible to simulate and understand the behavior of dense medium cylindrical cyclone. In particular we are interested in the cylindrical Tri-Flo DynaFeed cyclone separator installed in several coal, metalliferous, and non-metallic ore treatment plants. The work was based on the experimental data obtained by Chine on the reduced size (inner diameter 100 mm) pilot Tri-Flo separator, made from transparent acrylic material (called Glastic) and operated with water. Chine's goal was to measure the velocity profiles inside the device at different values of the operating parameters and also to obtain the influence of the parameters on each other. (literal)
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