Improving efficiency of conventional and square cyclones using different configurations of the laminarizer

Fatahian, Hossein; Fatahian, Esmaeel; Nimvari, Majid Eshagh

doi:10.1016/j.powtec.2018.08.038

Cited by 45 publications

(11 citation statements)

References 36 publications

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“…Figure 12 illustrates the pressure drop (Pa) values as a function of inlet velocity for the square cyclone with straight inlet, inclined inlet, and bend inlet. It was observed that the pressure drop slightly increased with an increase in inlet velocity [8,32].…”

Section: Effect Of Inlet Section On Pressure Dropmentioning

confidence: 99%

“…Pressure drop is a significant parameter in designing cyclone which can be expressed as the difference between the inlet and outlet pressures [8]. Figure 12 illustrates the pressure drop (Pa) values as a function of inlet velocity for the square cyclone with straight inlet, inclined inlet, and bend inlet.…”

Section: Effect Of Inlet Section On Pressure Dropmentioning

confidence: 99%

“…Therefore, a special attempt should be done to enhance the separation efficiency of this type of cyclone. Fatahian et al [8] considered the impact of laminarizer on the characteristics of conventional and the square cyclones. They indicated that using the laminarizer in a square cyclone was more useful than the conventional cyclone.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Effect Of Inlet Section On Pressure Dropmentioning

confidence: 99%

Section: Effect Of Inlet Section On Pressure Dropmentioning

confidence: 99%

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Performance assessment of a square cyclone influenced by inlet section modifications

Hosseini

2020

J Braz. Soc. Mech. Sci. Eng.

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“…Moreover, Oh et al [22] investigated the internal flow field and particle separation efficiency of the downward exhaust cyclone based on the Euler-Lagrange method. Fatahian et al [23] studied the performance that using the laminarizer in the square and circular cyclones, the results suggested that square cyclone is more effective. Additionally, Mokni et al [24] used the CFD method to study the effects of cylinder height on flow field, pressure drop and separation performance in a turbulent hydrocyclone.…”

Section: Introductionmentioning

confidence: 99%

Numerical Study on Separation Performance of Cyclone Flue Used in Grate Waste Incinerator

et al. 2019

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The traditional treatment of waste incineration flue gas is mostly carried out in low temperatures, but there are some problems such as corrosion of the heating surface at high and low temperatures, re-synthesis of dioxins, and low efficiency. Therefore, it is necessary to remove the pollutants at high temperatures. For the grate waste incinerator, this study proposes an adiabatic cyclone flue arranged at the exit of the first-stage furnace of the grate waste incinerator to pre-remove the fly ash at high temperatures, so as to alleviate the abrasion and corrosion of the tail heating surface. In this paper, computational fluid dynamics (CFD) method is applied to study the performance of a cyclone flue under different structural parameters, and the comprehensive performance of the cyclone flue is evaluated by the technique for order preference by similarity to an ideal solution (TOPSIS) method. The results show that particle separation efficiency increases at first and then decreases with the increase of the vortex finder length, the vortex finder diameter, and the distance between vortex finder and gas outlet tube, while it decreases with the increase of the gas outlet tube diameter. The pressure drop increases with the increase of the vortex finder length, and the vortex finder diameter, while decreases with the increase of the distance between the vortex finder, the gas outlet tube, and the gas outlet tube diameter. In the scope of this study, when h1/a = 1.1, D1/A = 0.33, h2/A = 1.5, and D2/A = 0.50, the comprehensive performance of the cyclone flue is much better.

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“…Later on, a new variant of the square cyclone was developed and applied in CFB boilers that implemented water cooling and a curved inlet, which helped to accelerate the particles and, consequently, improve separation efficiency [11][12][13]. Fatahian et al [14] proposed an unusual solution to improve the efficiency of the square cyclone. They introduced a laminarizer inside the inlet and the vortex finder and found that it had a positive effect on separation efficiency.…”

Section: Introductionmentioning

confidence: 99%

Investigations of the flow field inside a square cyclone separator using DPIV and CFD

Wasilewski

Brar

2019

E3S Web Conf.

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This study used CFD and DPIV to investigate the flow field inside a square cyclone. For CFD, turbulent flow was modelled using 3D RANS equations (with an RSM complementary model). The results of the analysis indicate that the flow inside a square cyclone has two constituents: an outer, free flow and an inner, forced flow in the centre, as with cyclones with the traditional structure. Furthermore, the results indicate that the corners of a square cyclone generate additional vortexes that cause pressure drop to increase (but may, at the same time, potentially improve separation efficiency). The two methods provided highly consistent results. DPIV may be a very good method for validating results obtained with CFD, including for the analysis of flow fields.

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Improving efficiency of conventional and square cyclones using different configurations of the laminarizer

Cited by 45 publications

References 36 publications

Performance assessment of a square cyclone influenced by inlet section modifications

Performance assessment of a square cyclone influenced by inlet section modifications

Numerical Study on Separation Performance of Cyclone Flue Used in Grate Waste Incinerator

Investigations of the flow field inside a square cyclone separator using DPIV and CFD

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