Influence of a laminarizer at the inlet on the classification performance of a cyclone separator

Huang, An‐Ni; Maeda, Norio; Shibata, Daiki; Fukasawa, Tomonori; Yoshida, Hideto; Kuo, H.P.; Fukui, Kiichi

doi:10.1016/j.seppur.2016.09.053

Cited by 59 publications

(11 citation statements)

References 26 publications

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“…Besides, the impact of the Brownian motion of particles and the Saffman lift force is also negligible compared to the drag and gravity forces. Thus, the gravitational and drag forces are dominant forces in gas‐solid separators 35, 63–65, 78, 79, 90, 91, 93, 101, 107, 108. The drag force, Saffman lift force, virtual mass force, and pressure gradient force are considered if the particles are carried by the gas flow inside the separator 81.…”

Section: Discussionmentioning

confidence: 99%

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An Overview of Numerical Simulations on Gas‐Solid Cyclone Separators with Tangential Inlet

Dehdarinejad

Bayareh

2021

ChemBioEng Reviews

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Cyclone separators play a dominating role in fluid catalytic cracking, biomass pyrolysis, dedusting, demisting, heavy oil regrading, etc. Separation mechanism, pressure drop, particle size, collection efficiency, gas underflow, gas inlet velocity, particle loading, cut‐off size of particles, and gas residence time are the main cyclone performance criteria. In the present work, the particle separation theory is explained and recent developments of numerical simulations of different cyclone separators with tangential inlet are summarized. Besides, the effect of different parameters on cyclone performance is discussed and several suggestions are provided based on previous numerical simulations.

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Section: Discussionmentioning

confidence: 99%

“…Huang et al. 65 investigated the effect of a laminarizer on the pressure drop, separation efficiency, gas tangential velocity distribution, and particle distribution at the inlet area of the cyclone. The laminarizer consits of 15 parallel tubes mounted at the cyclone entrance.…”

Section: Numerical Approachmentioning

confidence: 99%

An Overview of Numerical Simulations on Gas‐Solid Cyclone Separators with Tangential Inlet

Dehdarinejad

Bayareh

2021

ChemBioEng Reviews

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“…Knowing the approximating values of X, the approximate value of the separation efficiency of the cyclones 2, 3, and 4 can be calculated using the following Eqs. (58)-(60) [47,48].…”

Section: Detail Mass and Heat Conservation Equations Of Sp System And Each Cyclone Separatormentioning

confidence: 99%

New Method Evaluation of Detail Material and Heat Flows for Single String Cement Clinker Plant

et al. 2021

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Material flow in each main equipment of a cement clinker plant, which is very useful for controlling the process, is impossible to be measured during operation due to very high temperatures. This paper intends to overcome the difficulties associated with the measurement of these material flow values. This study presents a new method of calculating material flow (gas and solid) in each main equipment of a single string conventional suspension preheater type of a cement clinker plant. Using the proposed method, mass flow rate at a clinker cooler, kiln, suspension preheater (SP) and even each cyclone separator can be calculated with a heat conservation error less than 1 %. With the application of the least square method for solving the overdetermined system of mass and heat conservation equations obtained in the cyclones of SP, the flow of gas and solid materials entering and exiting each cyclone that cannot be measured directly in the operating plant can be approached. Based on the operation temperature data of gas and solid flows monitored in the control room of an Indonesian cement plant as a case study, the mass flow rate of gas and solid entering and exiting as well as separation efficiency of each cyclone can be calculated. The results show that the separation efficiencies of cyclones 1, 2, 3 and 4 are 95 %, 91.89 %, 84.09% and 79.51% respectively. Finally, this study will be very useful by providing data that are impossible to gather by a direct measurement in an operating plant, due to a very high process temperature constraint, for operational control needs, new equipment design, process simulation using computational fluid dynamics (CFD) software and even modification of existing equipment. The proposed method can be applied to all types of modern cement clinker plant configurations, either with or without a calciner including the double strings.

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“…They indicated that using the laminarizer in a square cyclone was more useful than the conventional cyclone. Furthermore, Huang et al [9] increased the efficiency of the conventional cyclone through a laminarizer and better cyclone 50% cut size performances were achieved with laminarizer. Wasilewski et al [7] studied the impact of varying the diameter of the vortex finder and its insertion length on the total performance of the square cyclone.…”

Section: Introductionmentioning

confidence: 99%

Performance assessment of a square cyclone influenced by inlet section modifications

Hosseini

2020

J Braz. Soc. Mech. Sci. Eng.

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The main objective of the present study was to analyze the effect of varying the inlet shape on the flow field and overall performance in a square cyclone. Three different inlet shapes, namely straight, inclined, and bend inlets, were specifically proposed to improve the low separation efficiency of the square cyclone. A three-dimensional numerical simulation was done by solving the Reynolds averaged Navier-Stokes equations with the Reynolds stress model turbulence model and applying the Eulerian-Lagrangian two-phase method. The turbulent dispersion of particles was predicted by the application of the discrete random walk model. Comprehensive comparisons of pressure drop, separation efficiency, 50% cut sizes, and flow field were performed to demonstrate the mechanism of how the inlet shape influenced the square cyclone performance. The results extracted from computational fluid dynamics simulation demonstrated that although using inclined and bend inlets produced an increase in pressure drop, they positively enhanced the separation efficiency of the square cyclone. Among all inlet shapes, inclined inlet significantly helped the square cyclone to collect finer particles, as it reduced the 50% cut sizes approximately 29.4% at an inlet velocity of 28 m/s. Keywords Square cyclone • Inlet shape • Separation efficiency • Eulerian-Lagrangian • Computational fluid dynamics (CFD) Abbreviations C D Drag coefficient ν Gas kinematic viscosity (m 2 /s) K Fluctuating kinetic energy (m 2 /s 2) u i Gas velocity in i-direction (m/s) g i Gravitational acceleration in i-direction (m/s 2) P f Fluctuating energy production (m 2 /s 3) μ Gas dynamic viscosity (kg/ms) ρ Gas density (kg/m 3) ρ p Particle density (kg/m 3) R ij Reynolds stress tensor u pi Particle velocity in i direction (m/s) ε Turbulence dissipation rate (m 2 /s 3) v Velocity (m/s) d p Particle diameter (μm) Re p Relative Reynolds number P Pressure (Pa)

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Influence of a laminarizer at the inlet on the classification performance of a cyclone separator

Cited by 59 publications

References 26 publications

An Overview of Numerical Simulations on Gas‐Solid Cyclone Separators with Tangential Inlet

An Overview of Numerical Simulations on Gas‐Solid Cyclone Separators with Tangential Inlet

New Method Evaluation of Detail Material and Heat Flows for Single String Cement Clinker Plant

Performance assessment of a square cyclone influenced by inlet section modifications

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