Solid circulation and loop-seal characteristics of a dual circulating fluidized bed: Experiments and CFD simulation

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

doi:10.1016/j.cej.2011.01.041

Cited by 79 publications

(39 citation statements)

References 27 publications

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“…Quite a few CLC configurations have been proposed [6][7][8][9][10][11]. The interconnected fluidized bed configuration, which is based on the principle of circulating fluidized bed including a high-velocity riser (air reactor) and a low-velocity bubbling bed (fuel reactor), has been identified as one of the promising choices [6,12,13].…”

Section: Fig 1 Schematic Of Chemical Looping Combustion Processmentioning

confidence: 99%

“…Non-mechanical valve of pot-seal was used in a hot prototype investigated in this study, which has the advantage of operation in high temperature and pressure conditions [10]. In this study, the pot-seal was operated in the bubbling fluidization regime.…”

Section: Effect Of Gas Velocity In the Pot-sealmentioning

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%

“…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%

“…Generally, the operating gas velocity in proportion to the minimum fluidization velocity was investigated to explore its effect on solids circulation rate in the interconnected fluidized bed [10,[35][36][37].…”

Section: Simulation Conditionsmentioning

confidence: 99%

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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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Section: Fig 1 Schematic Of Chemical Looping Combustion Processmentioning

confidence: 99%

Section: Effect Of Gas Velocity In the Pot-sealmentioning

confidence: 99%

Section: Fig 1 Schematic Of Chemical Looping Combustion Processmentioning

confidence: 99%

Section: Fig 1 Schematic Of Chemical Looping Combustion Processmentioning

confidence: 99%

Section: Simulation Conditionsmentioning

confidence: 99%

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

et al. 2016

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Experimental and numerical investigation of the dynamics of loop seals in a large‐scale DFB system under hot conditions

et al. 2015

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The dynamics of the loop seals in a large‐scale dual fluidized bed (DFB) system is investigated as a function of variations in the flux of the bed material through the seal and changes in the bed material density. These investigations are performed numerically with a computational fluid dynamics (CFD) model and experimentally for the loop seals of the Chalmers 2–4 MWth DFB gasifier. Both experiments and simulations show that more of the aeration gas leaves the loop seal in the direction of the solids when a low‐density bed material (silica) is used rather than a high‐density one (bauxite). The simulations also reveal homogeneous fluidization in a vertical connection to the loop seal, whereas an inclined connection yields heterogeneous fluidization. The minor discrepancies between the experiments and simulations with silica are attributed to particle agglomeration, and it is proposed that CFD models applied to loop seals should account for this phenomenon. © 2015 American Institute of Chemical Engineers AIChE J, 61: 3580–3593, 2015

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Numerical Modelling of Fluidized Bed Gasification: An Overview

Gupta

Bhaskaran

2017

Coal and Biomass Gasification

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Solid circulation and loop-seal characteristics of a dual circulating fluidized bed: Experiments and CFD simulation

Cited by 79 publications

References 27 publications

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

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

Experimental and numerical investigation of the dynamics of loop seals in a large‐scale DFB system under hot conditions

Numerical Modelling of Fluidized Bed Gasification: An Overview

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