CFD simulations of circulating fluidized bed risers, part I: Grid study

Li, Tingwen; Gel, Aytekin; Pannala, Sreekanth; Shahnam, Mehrdad; Syamlal, Madhava

doi:10.1016/j.powtec.2014.01.021

Cited by 58 publications

(36 citation statements)

References 29 publications

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“…The 2D configuration was chosen in order to allow for the large number of simulations completed in this study. In addition, it has been recently found that 3D simulations show better grid-independence behaviour than 2D simulations [27], implying that conclusions from 2D simulations should be safely extendable to 3D simulations. Figure 2, each geometry was divided into three zones: the bed zone comprising the bottom 40% of the reactor, a porous zone for the top 10% and a freeboard zone for the remaining 50% in between.…”

Section: Geometry and Meshingmentioning

confidence: 99%

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Grid independence behaviour of fluidized bed reactor simulations using the Two Fluid Model: Effect of particle size

2015

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Section: Geometry and Meshingmentioning

confidence: 99%

“…By using these slip velocities, the real particle relaxation times can be estimated for each of the cases in Table 6 using Equation 27. These data are reported in Table 7.…”

Section: Influence Of the Particle Relaxation Time On Grid Independenmentioning

confidence: 99%

Grid independence behaviour of fluidized bed reactor simulations using the Two Fluid Model: Effect of particle size

2015

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“…Circulating fluidized beds have several significant advantages such as increased through-put, in-bed sulfur capture, fuel flexibility, and high efficiencies in gasification and combustion with relatively low emissions of NOx [1][2]. CFB technology is more attractive in the industry of energy than several other systems.…”

Section: Introductionmentioning

confidence: 99%

“…CFB technology is more attractive in the industry of energy than several other systems. Despite its extensive applications, the complex hydrodynamics of CFBs are still not completely understood and difficult to predict, in most applications, the heat and mass transfer between the phases and the chemical reactions make it even more difficult to predict the behavior of CFB reactors [2]. The solid particles placed on porous plate called distributor subsequently the continuous phase forced through the holes of distributor causing the particles suspension in the flowing flow, the solid particles expand in the bed and the expansion increase as the water flow rate increase.…”

Section: Introductionmentioning

confidence: 99%

Experimental and CFD Investigation the Effect of Solid Particle Height in Water-Solid Flow in Fluidized Bed Column

Al-Turaihi¹

2015

IJMEA

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Abstract:The liquid solid fluidized beds have been usually used in catalytic cracking, ion exchange, crystallization, and particle classification. Fluidized bed column has investigated experimentally and numerically. A numerical investigation has been done by using computational fluid dynamic software ANSYS Fluent 15.0. In this study, a spherical stainless steel has used as solid particle fluidized continuously by water. Three different values of water flow rate (10, 15, 20 l/min) have used with three different values of static head of the solid particles (2, 2.5, 3 cm). The pressure of the fluidized bed has been measured at four different location of the test section 20 cm apart and the flow behavior at the test section has monitored by using AOS high speed camera. The experimental data has compared with numerical solution and a good agreement has been found. It can be observed that the expansion of the solid particles and the pressure inside the bed increased as the water flow rate and static bed height increased.

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“…Implosions of cavitation bubbles inside the nozzle holes increase when the turbulence kinetic energy increases and contributes to the further break-up of the spray [8][9].Therefore, the aim of this research is to use CFD simulation to determine the influence of orifice hole shape by analyzing the nozzle flow characteristics of the premix injector.…”

Section: Introductionmentioning

confidence: 99%

Effects of Nozzle Shape on the Flow Characteristics of Premix Injector Using Computational Fluid Dynamics (CFD)

Yii

Chin

Amirnordin

et al. 2015

AMM

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Abstract. The burner system is a patented, unique, higher-efficiency and fuel-injector system that works with a specially designed oil burner to create ultra-efficient combustion that reduces oil use, greenhouse gases and other harmful emissions. This research shows the injector nozzle geometries play a significant role in flow characteristics, atomization and formation of fuel-air mixture in order to improve combustion performance, and reducesome pollutant products from burner system. The aim of this research is to determine the effects of nozzle hole shape on flowcharacteristics of the premix injector by using CFD. Multiphase of volume of fluid (VOF) cavitating flow inside nozzles are determined by means of steady simulations and Eulerian-Eulerian two-fluid approach is used for performing mixing of Jatropha oil and air. Nozzle flow simulations resulted that cavitation area is strongly dependent on the nozzle hole shape. Conical hole with k-factor of 2 provides higher flow velocity and turbulent kinetic energy compared with conical hole with k-factor of 1.3 and cylindrical hole. The results show that the premix injector nozzle hole shape gives impact to the flowcharacteristics and indirectly affects the emission of the burner system.

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CFD simulations of circulating fluidized bed risers, part I: Grid study

Cited by 58 publications

References 29 publications

Grid independence behaviour of fluidized bed reactor simulations using the Two Fluid Model: Effect of particle size

Grid independence behaviour of fluidized bed reactor simulations using the Two Fluid Model: Effect of particle size

Experimental and CFD Investigation the Effect of Solid Particle Height in Water-Solid Flow in Fluidized Bed Column

Effects of Nozzle Shape on the Flow Characteristics of Premix Injector Using Computational Fluid Dynamics (CFD)

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