Mixing and dispersion of particle ropes in lean phase pneumatic conveying

Bilirgen, Harun; Levy, Edward K.

doi:10.1016/s0032-5910(00)00413-7

Cited by 49 publications

(37 citation statements)

References 9 publications

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“…5 can be seen that the particles are concentrated in small areas in the center of geometry and close to the wall of the chamber. This is due to the fact that almost all of the particles from the lower inlet flow down along the chamber wall in the form of 'rope' and get into a lower outlet, which results in free motion of the gas phase [18,19].…”

Section: Resultsmentioning

confidence: 99%

Numerical simulation of thermal-hydraulic processes in the riser chamber of installation for clinker production

Borsuk

Dobrowolski

Wydrych

et al. 2016

Archives of Thermodynamics

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Clinker burning process has a decisive influence on energy consumption and the cost of cement production. A new problem is to use the process of decarbonization of alternative fuels from waste. These issues are particularly important in the introduction of a two-stage combustion of fuel in a rotary kiln without the typical reactor-decarbonizator. This work presents results of numerical studies on thermal-hydraulic phenomena in the riser chamber, which will be designed to burn fuel in the system where combustion air is supplied separately from the clinker cooler. The mathematical model is based on a combination of two methods of motion description: Euler description for the gas phase and Lagrange description for particles. Heat transfer between particles of raw material and gas was added to the numerical calculations. The main aim of the research was finding the correct fractional distribution of particles. For assumed particle distribution on the first stage of work, authors noted that all particles were carried away by the upper outlet to the preheater tower, what is not corresponding to the results of experimental studies. The obtained results of calculations can be the basis for further optimization of the design and operating conditions in the riser chamber with the implementation of the system. Keywords: Two-phase flow; Precalcination; Particle distribution; CFD

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Section: Resultsmentioning

confidence: 99%

Numerical simulation of thermal-hydraulic processes in the riser chamber of installation for clinker production

Borsuk

Dobrowolski

Wydrych

et al. 2016

Archives of Thermodynamics

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“…The particle diameters were stochastically sampled using the Rossin Rammler distribution function (Equation 1) and particle size distribution information obtained from sieve analysis given in Table 1. Partial differential equations [3] were discretized by using the finite volume …”

Section: Numerical Modelmentioning

confidence: 99%

Balancing of Pulverized Coal Flows to Burners in Boilers With Pressurized Vertical Spindle Mills

Bilirgen¹

2005

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Numerical modeling of a vertical spindle mill was performed using commercially available CFD software, Fluent 6.1. The results of an experimental study that had been carried out for a Stairmand cyclone were used for model development and verification since both the vertical spindle pulverizer and the cyclone have strong swirling flow and particle separation within the geometry.After the model verification study, numerical simulations were performed for a commonly used vertical spindle pulverizer. To understand the flow structures within the pulverizer, our study focused on the reference flow geometry, where there was no modification to the pulverizer. Examining the CFD model results guided us in designing flow control elements and positioning them in the discharge turret.Numerical simulations were carried out with a spherical object positioned in the annulus region at the inlet of the discharge turret. The CFD results indicate that a spherical object positioned at the inlet plane of the discharge turret could effectively control the coal flow while having negligible effect on the primary air flow. Other flow controller designs will now be elevated in an effort to optimize the flow controller design and performance.iv

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“…Tsuji and Morikawa [9] and Tsuji et al [10] for instance developed a complete analysis of the gas-particle flow in the developed flow region of horizontal and vertical ducts by means of Laser Doppler Velocimeter (LDV). Some years later the research group at Lehigh University (Yilmaz and Levy [12]; Akilli et al [1]; Bilirgen and Levy [2]) analyzed the gas-particle flow by means of a fiber optic probe in the presence of different geometrical configurations and devices. The studied geometry was constituted of a vertical duct connected to the first by a 90° elbow and a second horizontal duct connected with the vertical one with another 90° elbow.…”

Section: Introductionmentioning

confidence: 99%

“…Basically, two phenomenological approaches are employed in the representation of the two-phase flows: the Eulerian-Lagragian (E-L) and the Eulerian-Eulerian (E-E) models. Several numerical studies showing the two-phase flow behavior in ducts were developed in the literature using the E-L approach, [1,2,5,6,12], and the E-E approach [4,7]. It is known that the E-L approach requires a great amount of tracking particles to describe efficiently the two-phase flow in ducts, which increases the computational time.…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation of gas-solid flow in ducts by CFD techniques

Decker¹,

Noriler²,

Meier³

et al. 2009

Computational Methods in Multiphase Flow V

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Numerical models are nowadays used on a large scale for the simulation of two-phase flow processes in the chemical industry, due mainly to their low implementation cost and important results. However, to find the best numerical models in such processes, validation with experimental data is required. In this sense, the main objective of this work is to apply a CFD model under Eulerian-Eulerian framework for the gas-particle flow, with the capability to predict the fluid dynamics of the two-phase flows in vertical and horizontal ducts separated by 90° elbows. A three-dimensional and transient model has been applied for predictions of volume fractions, pressure, velocities and turbulence properties fields. For the momentum transfer between phases a drag model based on the application of "Churchill" asymptotes techniques was used to obtain a continuous function for all flow regimes. Furthermore, the wall effects over the particulate flow have been investigated. The mathematical model was applied in CFD commercial codes for numerical studies and compared with experimental data obtained by the research group at Lehigh University. The model is solved using the finite-volume method with variables located in a generalized co-ordinate system. The main results present the volume fraction and velocities profiles as a function of the time and position. In addition, the mean velocity and particle concentration of the radial profiles were compared with experimental data in different axial positions of the vertical duct. The results showed a good agreement for the mean particle velocity with the increment of the axial position.

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Mixing and dispersion of particle ropes in lean phase pneumatic conveying

Cited by 49 publications

References 9 publications

Numerical simulation of thermal-hydraulic processes in the riser chamber of installation for clinker production

Numerical simulation of thermal-hydraulic processes in the riser chamber of installation for clinker production

Balancing of Pulverized Coal Flows to Burners in Boilers With Pressurized Vertical Spindle Mills

Numerical simulation of gas-solid flow in ducts by CFD techniques

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