Computational and experimental investigations in a cyclone dust separator

Fraser, S. M.; Abdelrazek, Amr M.; Abdullah, M. Z.

doi:10.1243/0954408971529719

Cited by 44 publications

(24 citation statements)

References 10 publications

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“…The dimensionless velocity proÿle is scaled with the inlet duct velocity. The experimental data used for validation are published in Reference [21]. The predictions have also been carried out at the apex cone of a cyclone separator.…”

Section: Continuous Flow Predictionsmentioning

confidence: 99%

Comparative study of the continuous phase flow in a cyclone separator using different turbulence models

Shalaby

Pachler

Wozniak³

et al. 2005

Numerical Methods in Fluids

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SUMMARYNumerical calculations were carried out at the apex cone and various axial positions of a gas cyclone separator for industrial applications. Two di erent NS-solvers (a commercial one (CFX 4.4 ANSYS GmbH, Munich, Germany, CFX Solver Documentation, 1998), and a research code (Post-doctoral Thesis, Technical University of Chemnitz, Germany, September, 2002)) based on a pressure correction algorithm of the SIMPLE method have been applied to predict the ow behaviour. The ow was assumed as unsteady, incompressible and isothermal. A k-turbulence model has been applied ÿrst using the commercial code to investigate the gas ow. Due to the nature of cyclone ows, which exhibit highly curved streamlines and anisotropic turbulence, advanced turbulence models such as Reynolds stress model (RSM) and large eddy simulation (LES) have been used as well. The RSM simulation was performed using the commercial package activating the Launder et al. 's (J. Fluid. Mech. 1975; 68(3):537-566) approach, while for the LES calculations the research code has been applied utilizing the Smagorinsky model. It was found that the k-model cannot predict ow phenomena inside the cyclone properly due to the strong curvature of the streamlines. The RSM results are comparable with LES results in the area of the apex cone plane. However, the application of the LES reveals qualitative agreement with the experimental data, but requires higher computer capacity and longer running times than RSM. This paper is organized into ÿve sections. The ÿrst section consists of an introduction and a summary of previous work. Section 2 deals with turbulence modelling including the governing equations and the three turbulence models used. In Section 3, computational parameters are discussed such as computational grids, boundary conditions and the solution algorithm with respect to the use of MISTRAL=PartFlow-3D. In Section 4, prediction proÿles of the gas ow at axial and apex cone positions are presented and discussed. Section 5 summarizes and concludes the paper.

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Section: Continuous Flow Predictionsmentioning

confidence: 99%

Comparative study of the continuous phase flow in a cyclone separator using different turbulence models

Shalaby

Pachler

Wozniak³

et al. 2005

Numerical Methods in Fluids

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“…In a typical cyclone as suggested by Bloor et al (1957), Bloor et al (1975), Slack et al (2000), and Fraser et al (2000), the mixture enters the inlet of the cyclone tangentially and accelerates in a helical pattern on its way down into conical section resulting in complex flow pattern with strong swirling motion. Heavier particles in the mixture have too much inertia to follow the stream curve, hence they strike the outside wall and then slide down to the bottom of cyclone, where they are collected and sent back to the riser through downcomer of the CFB reactor, while the very fine particles reverse and swirl along the center line and get escaped from the cyclone through vortex finder.…”

Section: Introductionmentioning

confidence: 89%

Numerical Analysis of Gas-Solid Behavior in a Cyclone Separator for Circulating Fluidized Bed System

Prabhansu

Rajmistry

Ganguli

et al. 2017

JAFM

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Cyclones are one of the most widely used gas-solid separators in circulating fluidized bed (CFB) systems. This paper focuses on numerical study of the gas-solid flow in a cyclone attached to the CFB system. The objective was to understand the flow pattern in the cyclone in order to run the CFB setup problem free. The previous works on cyclone separators do not include critical parameter such as coefficient of restitution which is responsible for swirling effect and increase in efficiency. Reynolds stress model (RSM) is used to obtain the gas flow characteristics. The resulting flow and pressure fields are verified by comparing with the measured experimental results and then used in the determination of solids flow that is simulated by the use of a discrete phase model. The simulation results show how the particle trajectories and cyclone efficiency change with varying coefficient of restitution and particle size keeping inlet velocity of gas and mean particle diameter constant. The separation efficiency, pressure drop and particle trapping time from the numerical analysis are shown to be comparable to those observed experimentally. The velocity distribution pattern obtained from the analysis exhibits strong flow recirculation with large turbulent eddies in the cyclone separator. The particle trajectories depend upon relative velocity of fluid/particles and concentration of particles. Efficiency of the cyclone is found to be dependent on particle size and coefficient of restitution. The results obtained are further utilized to optimize the velocity range of gas flow in the loop seal and riser for stable operation of CFB setup.

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“…This cyclone was investigated experimentally by SM Fraser et al [9]. In this study, a cone was located above the inlet of dust hopper.…”

Section: Mathematical Models and Geometrymentioning

confidence: 98%

The Structure Optimization Design of Anti Re-entrainment Cone in Cyclone Separator

Zhiquan¹,

Chen²

2015

Proceedings of the AASRI International Conference on Industrial Electronics and Applications (2015)

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Abstract-In this study, the computational fluid dynamics (CFD) method was used to optimize the structure of anti reentrainment cone in cyclone separator. The Reynolds stress model (RSM) was used to simulate the flow fields inside a cyclone separator with different anti re-entrainment cone structure, and their axial and tangential velocity distribution. Based upon that, it could be concluded that an anti reentrainment cone with half ball surface located above the inlet of dust hopper and blow-down from dust hopper could lead to a smoother fluid field upon the inlet of the dust hopper. Besides, an appropriate effective section ratio and blow-down ratio of the cyclone studied in this article could be figured out.

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Computational and experimental investigations in a cyclone dust separator

Cited by 44 publications

References 10 publications

Comparative study of the continuous phase flow in a cyclone separator using different turbulence models

Comparative study of the continuous phase flow in a cyclone separator using different turbulence models

Numerical Analysis of Gas-Solid Behavior in a Cyclone Separator for Circulating Fluidized Bed System

The Structure Optimization Design of Anti Re-entrainment Cone in Cyclone Separator

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