Numerical study of gas–solid flow in a cyclone separator

Wang, Bingkai; Xu, Dong; Chu, Kaiwei; Yu, Aibing

doi:10.1016/j.apm.2006.03.011

Cited by 333 publications

(165 citation statements)

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“…The CFD-3D analysis is an efficient and economical approach of understanding the fluid dynamics process in complex plants, providing a precious way to evaluate how it is affected by changes of operating conditions and geometric shapes. At this aim, the CFD approach has been used by many authors [1,[8][9][10][11][12][13][14][15]; the papers deal with issues relative to the flow of gas-solid suspensions predicting solid separation efficiency, at different operating conditions, in good agreement with the experimental evidences. Furthermore, in [13][14][15] the authors proved as the Reynolds Stress Model is the suitable turbulent model for cyclone with strong swirling flow.…”

Section: State Of the Artmentioning

confidence: 54%

“…At present, in literature, it is proved that the most utilized turbulence modelling is the RSM turbulence model [1,3,[8][9][10][11][12][13][14]. In addition, all these papers simulate isothermal plants while, the present work has to take into account the thermal exchange in its various forms (convection and radiation).…”

Section: Numerical Modelmentioning

confidence: 99%

“…At this aim, a lot of studies available in literature [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15], developed by many authors, have been widely studied, both numerically and experimentally, with the main goal of increasing the separation efficiency. Multiple studies [1][2][3][4][5][6][7][8] demonstrated the decisive influence of both operating parameters and design on the separation efficiency and pressure drop.…”

Section: State Of the Artmentioning

confidence: 99%

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Numerical study of the separation efficiency and heat exchange performance in a complex gas–solid separator

Mariani¹,

Risi²,

Poggiani³

2016

Int. J. CMEM

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This work presents a study on a gas-solid cyclone separator used in a complex cement production plant. The main objective of the study is based on the performance evaluation and optimization of the cyclone separator in terms of particle separation and heat transfer efficiencies, while keeping pressure losses under control. The thermal interaction is between two gas-solid mixtures, one at 850°C and the other at 600°C, respectively. The solid phase consists mostly of calcium carbonate subsequently intended to the so-called baking process for the production of clinker and ultimately cement. A first model has been setup using experimental data as boundary conditions to assess the physical model behavior and the CFD solver parameters. After that, five additional models with different geometries have been analyzed to evaluate the influence of the vortex finder (vf) length on the separation efficiency and on the heat exchange performance. By increasing the length of the vf, the results show a global improvement in the separation efficiency of up to 5% if compared to the geometry without the vf. Further, the increase in the vf length determines a monotonic decrease of temperature at the exit but a monotonic increase of pressure losses. In the second part of this work, using one of the previous models with vf, a study of the influence of the particle diameter on the separation efficiency has been performed. The increase of particle diameter causes an increase of the separation and thermal exchange performance, decreasing at the same time the pressure drop. The numerical approach for all the cases is based on implicit unsteady simulations using the Eulerian Multiphase model.

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Section: State Of the Artmentioning

confidence: 54%

Section: Numerical Modelmentioning

confidence: 99%

Section: State Of the Artmentioning

confidence: 99%

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Numerical study of the separation efficiency and heat exchange performance in a complex gas–solid separator

Mariani¹,

Risi²,

Poggiani³

2016

Int. J. CMEM

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“…In the existing cyclone and multi-cyclone designs, the extraction rate m 0 is usually within m 0 = 8÷15%, although it may sometimes reach m 0 = 20% [10,19,23,31].…”

Section: Methods Of Dust Removal From Dust Collector Of Air Filter Mumentioning

confidence: 99%

“…The measure of an intensity of dust extraction from the multicyclone (cyclone) dust collector is the extraction rate m 0 defined as a quotient of air stream flow rate Q S in the extraction system and the multi-cyclone (cyclone) outlet stream flow rate, and if the multi-cyclone is used as the first stage of air filtration in the air filter -to the air filter outlet stream flow rate Q G (engine inlet air) [10,19,23,31]:…”

Section: Methods Of Dust Removal From Dust Collector Of Air Filter Mumentioning

confidence: 99%

The effects of dust extraction on multi-cyclone and non-woven fabric panel filter performance in the air filters used in special vehicles

Dziubak¹

2016

EiN

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Article citation info: (*) Tekst artykułu w polskiej wersji językowej dostępny w elektronicznym wydaniu kwartalnika na stronie www.ein.org.pl ForewordProviding a dust-free inlet air to the internal combustion engines of motor vehicles and machines, and thus reducing wear and improving component life, always was and still is a major operational and design issue, in particular for vehicles operating in heavy-duty terrain and high dust concentration conditions (about 1 g/m 3 ) [2, 10, 12, 18,20, 30]. It generally applies to special vehicles, including military vehicles with high-power diesel engines with a maximum air demand Q Sil over 1 kg/s, e.g.: Q Sil = 1.21 kg/s, (3,400 m 3 /h) for T-72 tank engine and Q Sil = 2.15 kg/s (6,000 m 3 /h) for Leopard 2 tank engine. At dust concentration level s = 1 g/m 3 , specific to the vehicles used on testing grounds, the engines of those tanks draw in a stream of dust at 0.94 g/s and 1.67 g/s, respectively. Two-stage air filters in a multi-cyclone -porous panel filter configuration (usually made of paper filter element or non-woven fabric filter element) are used to remove the dust mass, with particle size <100 µm [2,4, 10], from the inlet air stream. The concept of using two-stage filters consists in initial separation of large dust particles in an inertial filter (multi-cyclone) and leaving small dust particles (d z < 15÷30 µm) in the air stream and separating small air particles (above d z = 2÷5 µm) in the panel air filter - Fig. 1.The time in which the air filtration system reaches permissible air filter flow resistance ∆p fdop (5÷8 kPa) is significantly longer compared DZIUBAK T. The effects of dust extraction on multi-cyclone and non-woven fabric panel filter performance in the air filters used in special vehicles. Eksploatacja i Niezawodnosc -Maintenance and Reliability 2016; 18 (3): 348-357, http://dx.doi.org/10.17531/ein.2016.3.5. Tadeusz DZIUBAKThe effecTs of dusT exTracTion on mulTi-cyclone and non-woven fabric panel filTer performance in The air filTers used in special vehicles wpływ odsysania pyłu na charakTerysTyki mulTicyklonu i włókninowej przegrody filTracyjnej filTru powieTrza pojazdu specjalnego*

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Function and effect of the inner vortex on the performance of cyclone separators

Wang

Pei

et al. 2017

AIChE Journal

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The inner vortex plays a key role in the performance of cyclone separators. To explore the function and effect of the inner vortex in cyclone separators, a series of metal rods and metal blades are inserted in the typical Lapple cyclone separator to reduce the intensity of the inner vortex. First, the changes in general performance of cyclones are measured by experimental methods after insertion of the metal rods and metal blades. The flow field and particle motion are then simulated, respectively, by means of a Reynolds stress model (RSM) and a Lagrangian particle tracking (LPT) model. The results show that when the length of the metal blades is less than the boundary between the inner and outer vortexes, that is, the outer vortex remains unchanged and the inner vortex is destroyed partly, the separation efficiency remains constant and the pressure drop significantly decreases. When the length of the metal blades exceeds the boundary, the inner vortex is completely destroyed, and the outer vortex is significantly damaged, which results in sharp decrease of both the separation efficiency and pressure drop. The results indicate that the inner vortex has a notable effect on the pressure drop and virtually none on the separation efficiency. © 2017 American Institute of Chemical Engineers AIChE J, 63: 4508–4518, 2017

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Numerical study of gas–solid flow in a cyclone separator

Cited by 333 publications

References 12 publications

Numerical study of the separation efficiency and heat exchange performance in a complex gas–solid separator

Numerical study of the separation efficiency and heat exchange performance in a complex gas–solid separator

The effects of dust extraction on multi-cyclone and non-woven fabric panel filter performance in the air filters used in special vehicles

Function and effect of the inner vortex on the performance of cyclone separators

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