CFD STUDY ON THE EFFECT OF NEAR GRAVITY MATERIAL ON DMC TREATING COAL USING DPM AND ASM MULTIPHASE MODEL

A V, Asha Kumari and Mangadody, Narasimha and G E, Sreedhar and et al, . (2015) CFD STUDY ON THE EFFECT OF NEAR GRAVITY MATERIAL ON DMC TREATING COAL USING DPM AND ASM MULTIPHASE MODEL. In: Eleventh International Conference on CFD in the Minerals and Process Industries, 7-9 December 2015, Melbourne, Australia.

Full text not available from this repository. (Request a copy)

Abstract

The difficulty in washing of coal is very much influenced by the amount of near-gravity materials (NGM) present at the desired cut density. It is believed that the dense medium separation of coal particles in the presence of a high percentage of NGM results in a significant misplacement of coal particles to wrong products. However the performance of dense medium cyclone (DMC) does not merely depend on the total amount of near gravity materials but also on their distribution as well as on their quality. In this paper, numerical simulation of magnetite medium segregation and coal partitioning has been made in a 350 mm diameter cyclone. An attempt is made to assess the nature of impairment in efficiency in relation to the increasing amount of near gravity materials in coal. The CFD model uses the Algebraic Mixture model with the granular option and Reynolds stress model (RSM) to resolve the air core and turbulent mixing of the medium and coal particles. The partition characteristics of the DMC were modelled using both Lagrangian and Eulerian particle tracking for particles ranging in size from 0.5 to 8 mm and in density from 1200 to 2000 kg.m-3 . Specifically near gravity density particles having different mass proportions are tracked inside DMC. The effect of NGM fraction on overall cyclone performance and product density differential was studied. It is observed that smaller size (-0.5 mm) coal particles having high NGM content seem to have a significant misplacement in a DMC

[error in script]

IITH Creators: