Performance characteristics of pilot plant dense media hydrocyclone for beneficiation of coal and 3-D CFD simulation

Suresh, Parate Dinesh; Kumar, Vivek; Sripriya, R.; Chakraborty, Sudipto; Meikap, B.C.

doi:10.1016/j.ces.2010.05.006

Cited by 25 publications

(6 citation statements)

References 19 publications

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“…The above discussion demonstrates that the hydrodynamic conditions in the modified hydrocyclone are similar to that of conventional equipments. [32][33][34] agreement between both data sets is observed. The experiments were done at four values of the cathodic potentials, i.e.…”

Section: Resultssupporting

confidence: 61%

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Editors' Choice—Coupling k Convection-Diffusion and Laplace Equations in an Open-Source CFD Model for Tertiary Current Distribution Calculations

Colli

Bisang

2019

J. Electrochem. Soc.

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A mathematical model to calculate tertiary current distributions in electrochemical reactors is presented taking into account the potential and concentration fields together with the hydrodynamics under laminar or turbulent conditions. Multiple reactions with different kinetic controls are considered at both electrodes. The computational algorithm solving the model was implemented in OpenFOAM. It allows the calculations for a given local potential at the working electrode, potentiostatic control, or for a fixed cell potential difference and also for a current flowing through the cell, galvanostatic operation. The model was validated by using the reduction of ferricyanide and the oxidation of ferrocyanide from dilute solutions as main test reactions and hydrogen and oxygen evolution as secondary ones, in a modified hydrocyclone. A close agreement between experimental and predicted current distributions was obtained. The hydrocyclone presents a promising electrochemical performance being the mass-transfer conditions in its cylindrical part better than in the conical region. The computational tool developed in this paper can be employed to optimize both cells stack design and system operation conditions. Likewise, the algorithm can also be used to check, when limiting current studies are needed, whether the desired reaction is under mass-transfer or charge-transfer control for a given geometric configuration.

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Section: Resultssupporting

confidence: 61%

“…Nevertheless, dead zones are not detected. The above discussion demonstrates that the hydrodynamic conditions in the modified hydrocyclone are similar to that of conventional equipments [32][33][34]. Fig.…”

mentioning

confidence: 52%

Editors' Choice—Coupling k Convection-Diffusion and Laplace Equations in an Open-Source CFD Model for Tertiary Current Distribution Calculations

Colli

Bisang

2019

J. Electrochem. Soc.

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“…22−26 In addition, its performance can also be improved by modifying its construction, creating the so-called nonconventional hydrocyclones. These new devices may have a parabolic shape instead of conical, 27−29 the structure of their vortex finder modified, 30−32 a solid rod inserted along their vertical axis, 33,34 and the number of feeds or design of the feed ducts changed. 35−38 A nonconventional hydrocyclone was proposed and developed by our research group by replacing the solid wall of the cone, cylinder, or both by a porous wall.…”

Section: Introductionmentioning

confidence: 99%

“…The operational success of a hydrocyclone depends on the relationship between its main dimensions. − Consequently, it is possible to manipulate or optimize the geometric variables of this device in order to meet the demands of a specific application. − In addition, its performance can also be improved by modifying its construction, creating the so-called nonconventional hydrocyclones. These new devices may have a parabolic shape instead of conical, − the structure of their vortex finder modified, − a solid rod inserted along their vertical axis, , and the number of feeds or design of the feed ducts changed. − …”

Section: Introductionmentioning

confidence: 99%

Study on Filtering Hydrocyclones Operating with Concentrated Non-Newtonian Suspensions

Morimoto,

Gonçalves,

Barrozo

et al. 2023

Ind. Eng. Chem. Res.

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Hydrocyclones are devices used to separate a discrete phase (solid or liquid) from a continuous liquid phase. Although this partition process is simple and versatile, there are limitations when separating concentrated suspensions with high viscosity. By replacing the cylinder or cone walls of hydrocyclones by a permeable wall, our research group developed the so-called filtering hydrocyclones. Although previous studies have shown that filtering hydrocyclones have a better performance than conventional devices of the same geometry, they were performed with diluted Newtonian suspensions. Thus, the aim of the present work is to evaluate the performance of a filtering and a conventional hydrocyclone of the same geometry operating with concentrate suspensions with pseudoplastic rheological behavior. The geometric relationship of these hydrocyclones was obtained in a previous optimization study that aimed at maximizing overall efficiency in aqueous diluted suspensions; this high-efficiency device is known as MOEH. When operating a pseudoplastic fluid with a behavior index equal to 0.6536, there was a 48% decrease in the efficiency of the MOEH hydrocyclone. The MOEH experiments performed with a pseudoplastic suspension containing 9.5 wt % of solids and 0.6 wt % of carboxymethyl cellulose achieved an Euler number of 1108, a split ratio of 44%, and an overall efficiency of 47%. However, the average results demonstrated that the operation with the newly designed filtering hydrocyclone, called MOEH-CoF, led to an Euler number about 10% lower and an overall efficiency about 5% higher than that obtained with the conventional device. The findings of this study can lead to a better understanding of solid–liquid separation in the petrochemical, mineral, and food industries, which generally works with concentrated non-Newtonian fluids.

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“…It also works most effectively for fine particle sizes (<600 μm), which precludes its use on stoker furnace lump coals, as they are in the 6–25 mm particle size range . For lump coal, the wet method of dense medium separation (DMS) is widely used. − DMS is regarded as a sink-and-float process, which can remove undesirable impurities from run-of-mine coal and upgrade the coal quality by simultaneously enabling lighter minerals to float and denser minerals to sink . After this separation, the dense medium is recovered via evaporation and the beneficiated coal is cleaned by washing .…”

Section: Introductionmentioning

confidence: 99%

Upgrading of Low-Grade Colombian Coals via Low-Cost and Sustainable Calcium Nitrate Dense Media Separation

et al. 2022

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Wet coal beneficiation in Colombia is prohibitive due to the high cost and scarcity of commonly used dense media. The practical value of this study is that it demonstrates for the first time that a common fertilizer, calcium nitrate, can be used in the beneficiation of low-grade Colombian coals. Three high-ash low-grade Colombian coals (Valle, Cundinamarca, and Antioquia) commonly used in Colombian sugar mill stoker furnaces were tested. Coal mineralogy and prevalence were analyzed before and after washing using mineral liberation analysis. The swelling potential of the coals was assessed using a novel application of thermal mechanical analysis (TMA) and an ash fusion oven (AFO). Calcium nitrate reduced ash levels across all size fractions, even for highash coals like Valle (29% to below 7%) to acceptable levels for coke manufacturing or pulverized fuel combustion. The novel use of TMA and AFO to analyze coal swelling demonstrated that swelling varies under constrained and unconstrained conditions and the small sample size allows for rapid testing of coal swelling. This study has demonstrated that the use of common fertilizers can allow beneficiation to become a processing option for low-grade coals in Official Development Assistance countries where conventional dense media is prohibitively expensive.

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Performance characteristics of pilot plant dense media hydrocyclone for beneficiation of coal and 3-D CFD simulation

Cited by 25 publications

References 19 publications

Editors' Choice—Coupling k Convection-Diffusion and Laplace Equations in an Open-Source CFD Model for Tertiary Current Distribution Calculations

Editors' Choice—Coupling k Convection-Diffusion and Laplace Equations in an Open-Source CFD Model for Tertiary Current Distribution Calculations

Study on Filtering Hydrocyclones Operating with Concentrated Non-Newtonian Suspensions

Upgrading of Low-Grade Colombian Coals via Low-Cost and Sustainable Calcium Nitrate Dense Media Separation

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