CFD simulation with experiments in a dual circulating fluidized bed gasifier

Nguyen, Trung Dac; Seo, Myung Won; Lim, Young‐Il; Song, Bang-Ho; Kim, Sang-Done

doi:10.1016/j.compchemeng.2011.07.005

Cited by 70 publications

(30 citation statements)

References 34 publications

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“…Chalermsinsuwan et al [7] studied the effects of various modeling parameters in the CFB downer. Nguyen et al [6] conducted two-dimensional (2D) CFD simulation to study hydrodynamics of a pilotscale cold-mode dual fluidized bed gasifier including the riser and gasifier and experimental researches as well. However, there are very few studies of CFD modeling and simulation analyses for plastic waste gasifier.…”

Section: Introductionmentioning

confidence: 99%

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Study of hydrodynamic characteristics in a circulating fluidized bed gasifier for plastic waste by computational fluid dynamics modeling and simulation

Lee

Choi

Seo

2014

J Mater Cycles Waste Manag

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For designing an efficient circulating fluidized bed reactor, understanding the complex hydrodynamic characteristics in the reactor is required. Hence, in the present study, the modeling and simulation of the circulating fluidized bed gasifier using plastic waste were carried out with Eulerian-Granular approach. Several cases were investigated as changing superficial gas velocities or sizes of plastic waste particle. Firstly, cases were examined with four different velocities when the particle diameter is 1 mm. At the gas velocity of 6 or 8 m/s, gas volume fraction is more than 95 % throughout the reactor and particle velocity has positive value overall. Therefore, a circulating fluidized bed seems to be formed in both cases. Comparing those two cases, better solid mixing can be expected considering the mass fraction and solid velocity at the superficial gas velocity of 6 m/s. Thus this case was further studied for the effect of particle size. As the diameters of plastic waste particle are 1 or 3 mm, it is considered that a circulating fluidized bed is formed. And plastic waste and sand particles are well mixed throughout the reactor. However, the particle diameter increases over 3 mm then, it is very hard to maintain circulating fluidization condition. List of symbols dParticle diameter (m) F Coefficient for interphase drag force (kg m -3 s -1 ) gGravitational acceleration (m s -2 ) P Pressure (pa) S sj jth solid phase stress tensor (Pa) V Velocity vector (m s -1 )Greek letters e Void fraction q Density (kg m -3 ) s g Deviatoric stress tensor for gas phase (Pa)

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Section: Introductionmentioning

confidence: 99%

“…Because of its importance, researchers have covered this issue in many studies [4][5][6][7]. Designing and making the large-scale reactor generally go through the several steps of scale-up process.…”

Section: Introductionmentioning

confidence: 99%

Study of hydrodynamic characteristics in a circulating fluidized bed gasifier for plastic waste by computational fluid dynamics modeling and simulation

Lee

Choi

Seo

2014

J Mater Cycles Waste Manag

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“…Kruggel-Emden et al [20] applied the exchanges of mass, momentum, heat and species sinks through time-dependent inlet and outlet boundaries to couple the fuel reactor and air reactor. Seo et al [10], Wang et al [21] and Nguyen et al [24] conducted 2-D full loop simulation of the interconnected fluidized bed to investigate the hydrodynamic behaviours and compared with experimental data.…”

Section: Fig 1 Schematic Of Chemical Looping Combustion Processmentioning

confidence: 99%

“…Some efforts have been carried out on the CFD simulation of chemical looping combustion processes [10,[16][17][18][19][20][21][22][23][24][25][26][27][28][29]. However, only a few investigations have been focused on the full loop simulation of the interconnected fluidized bed, due to the complexities in geometry and flow physics, which requires large computational resources [1,28].…”

Section: Fig 1 Schematic Of Chemical Looping Combustion Processmentioning

confidence: 99%

Three-dimensional full loop simulation of solids circulation in an interconnected fluidized bed

et al. 2016

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ReuseUnless indicated otherwise, fulltext items are protected by copyright with all rights reserved. The copyright exception in section 29 of the Copyright, Designs and Patents Act 1988 allows the making of a single copy solely for the purpose of non-commercial research or private study within the limits of fair dealing. The publisher or other rights-holder may allow further reproduction and re-use of this version -refer to the White Rose Research Online record for this item. Where records identify the publisher as the copyright holder, users can verify any specific terms of use on the publisher's website. TakedownIf you consider content in White Rose Research Online to be in breach of UK law, please notify us by emailing eprints@whiterose.ac.uk including the URL of the record and the reason for the withdrawal request. Abstract 3-D full loop CFD simulation of solids circulation rate is conducted in a complicated circulating-fluidized bed, which consists of a riser, a bubbling bed, a cyclone and a loop-seal. The effects of operating gas velocity, particle diameter and total solids inventory on the solids circulation rate are investigated based on the system pressure balance of an interconnected fluidized bed. CFD results indicate that the gas velocity in the riser plays a dominant role in controlling the solids circulation rate, whilst the gas velocity in the pot-seal influences in a narrow operating range. The solids circulation rate is strongly influenced by particle diameter and total solids inventory, but becomes insensitive to the operating conditions in the bubbling bed as the gas velocity is higher than the minimum fluidization velocity.

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“…Nguyen et al [30] developed a 2D Eulerian-Eulerian model to study the solid circulation in the full-loop of a dual fluidized-bed system. Wang et al [31] built a 3D model to simulate the hydrodynamics in a circulating fluidized-bed using the EE approach.…”

Section: Introductionmentioning

confidence: 99%

Three-dimensional full-loop simulation of a dual fluidized-bed biomass gasifier

et al. 2015

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h i g h l i g h t sCFD simulation of biomass gasification in a dual fluidized-bed. The CFD model predicts the gas composition and the reactor temperature distribution. The CFD model has been validated by experimental data. The effects of the particle size distribution and drag models have been investigated. a r t i c l e i n f o t r a c tA three-dimensional CFD model was developed to simulate the full-loop of a dual fluidized-bed biomass gasification system consisting of a gasifier, a combustor, a cyclone separator, and a loop-seal. This fullloop simulation includes the chemical kinetic modeling of biomass drying and pyrolysis, heterogeneous char reactions, and homogeneous gas-phase reactions. In the model, the gas phase is described using Large Eddy Simulation (LES) and the particle phase is described with the Multiphase Particle-In-Cell (MP-PIC) method. The simulation was performed using the GPU-accelerated computing and the simulation results were compared with the gas composition and temperature measurements from a pilot-scale biomass gasification power plant (1 MW th , 6 tons biomass/day). The independence of the accuracy of the model on mesh resolution and computational particle number was determined. The impacts of the particle size distributions (PSD) and drag models on the reactive flows were also investigated.

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CFD simulation with experiments in a dual circulating fluidized bed gasifier

Cited by 70 publications

References 34 publications

Study of hydrodynamic characteristics in a circulating fluidized bed gasifier for plastic waste by computational fluid dynamics modeling and simulation

Study of hydrodynamic characteristics in a circulating fluidized bed gasifier for plastic waste by computational fluid dynamics modeling and simulation

Three-dimensional full loop simulation of solids circulation in an interconnected fluidized bed

Three-dimensional full-loop simulation of a dual fluidized-bed biomass gasifier

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