Novel scaling parameter for circulating fluidized beds

Kehlenbeck, Ralf; Yates, J.G.; Felice, Renzo Di; Hofbauer, Hermann; Rauch, Reinhard

doi:10.1002/aic.690470308

Cited by 28 publications

(34 citation statements)

References 11 publications

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“…To construct a small column with similar hydrodynamic behavior as the large column and running under ambient conditions, the following dimensionless groups [9,11,13], mainly borrowed from Equation (1), were used:…”

Section: Experimental Methodsmentioning

confidence: 99%

“…Such closeness is considered tolerable for this analysis. The Reynolds number (ρ f u 0 d p /µ f ) was also added for an additional confirmation of proper scaling [13]. If the scaling groups calculated for an atmospheric fluidized bed operating at 800˝C and a model column at ambient condition are equal, the ratio of characteristics of the cold column to the hot column would be: linear dimensions (diameter and height) = 0.25, particle diameters = 0.25, particle densities = 3.5, and superficial air velocities = 0.5 [24].…”

Section: Experimental Methodsmentioning

confidence: 99%

“…Particle size distribution has been recommended as one of the scaling parameters to be matched between the two systems [13]. In this work, particle size distributions between the two models were not completely adjusted which is a source of error.…”

Section: Application Of Froude Numbersmentioning

confidence: 99%

“…For bubbling beds, Zhang and Yang [12] stated that only two groups were necessary to be equal for the two columns: gD{u 2 0 and u 0 {u m f where u mf is the minimum fluidization velocity. Kehlenbeck et al [13] used a series of numbers cited from Glicksman et al [9] as follows:…”

Section: Introductionmentioning

confidence: 99%

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Application of Scaling-Law and CFD Modeling to Hydrodynamics of Circulating Biomass Fluidized Bed Gasifier

et al. 2016

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Two modeling approaches, the scaling-law and CFD (Computational Fluid Dynamics) approaches, are presented in this paper. To save on experimental cost of the pilot plant, the scaling-law approach as a low-computational-cost method was adopted and a small scale column operating under ambient temperature and pressure was built. A series of laboratory tests and computer simulations were carried out to evaluate the hydrodynamic characteristics of a pilot fluidized-bed biomass gasifier. In the small scale column solids were fluidized. The pressure and other hydrodynamic properties were monitored for the validation of the scaling-law application. In addition to the scaling-law modeling method, the CFD approach was presented to simulate the gas-particle system in the small column. 2D CFD models were developed to simulate the hydrodynamic regime. The simulation results were validated with the experimental data from the small column. It was proved that the CFD model was able to accurately predict the hydrodynamics of the small column. The outcomes of this research present both the scaling law with the lower computational cost and the CFD modeling as a more robust method to suit various needs for the design of fluidized-bed gasifiers.

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Section: Experimental Methodsmentioning

confidence: 99%

Section: Experimental Methodsmentioning

confidence: 99%

Section: Application Of Froude Numbersmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Application of Scaling-Law and CFD Modeling to Hydrodynamics of Circulating Biomass Fluidized Bed Gasifier

et al. 2016

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“…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%

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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Gas distributor and bed material effects in a cold flow model of a novel multi-stage biomass gasifier

Dhrioua

Hassen

Kolsi

et al. 2019

Biomass and Bioenergy

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Novel scaling parameter for circulating fluidized beds

Cited by 28 publications

References 11 publications

Application of Scaling-Law and CFD Modeling to Hydrodynamics of Circulating Biomass Fluidized Bed Gasifier

Application of Scaling-Law and CFD Modeling to Hydrodynamics of Circulating Biomass Fluidized Bed Gasifier

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

Gas distributor and bed material effects in a cold flow model of a novel multi-stage biomass gasifier

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