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Mechanistic modeling, numerical simulation and validation of slag-layer growth in a coal-fired boiler
Sunder Balakrishnan,
Published in Elsevier Ltd
2015
Volume: 81
   
Pages: 462 - 470
Abstract
In a tangentially coal-fired boiler, for locations inside and near the combustor, heat-transfer by radiation is significant, and hence, ash particles arrive in molten state. The aim of the present study is to adopt a mechanistic modeling approach which incorporates energy-conservation principles to address slag-layer growth. In order to determine the outcome of molten ash impaction, a mechanistic bouncing potential model, incorporating the phenomenon of recoiling of molten ash droplets after impaction, is employed. The bouncing potential is a representation of the excess energy possessed by the recoiling splat, and is used to determine the outcome of molten ash impaction - to stick or to bounce. Computational fluid dynamics techniques, incorporating the effect of thermophoresis, are adopted to estimate the arrival rate of ash particles, and the bouncing potential model, as a user-defined function, is incorporated in the simulation package to determine the status of the droplets after impaction. Two coals of Indian origin are simulated for slag-layer growth for a period of 100min. The simulation results, when compared with field data provided by BHEL-Trichy, indicate that the model qualitatively predicts the growth of slag-layers. It has been further inferred that smaller particles dominate deposit formation and its growth. © 2014 Elsevier Ltd.
About the journal
JournalData powered by TypesetEnergy
PublisherData powered by TypesetElsevier Ltd
ISSN03605442
Open AccessNo
Concepts (22)
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    Boilers
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    Coal
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    Coal combustion
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    Computational fluid dynamics
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    Deposits
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    Drops
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    ELECTRIC LOAD SHEDDING
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    FLUID DYNAMICS
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    Heat transfer
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    Slags
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    BOUNCING POTENTIAL
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    COMPUTATIONAL FLUID DYNAMICS TECHNIQUE
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    ENERGY CONSERVATION PRINCIPLE
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    Mechanistic modeling
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    RETRACTION PHENOMENON
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    SIMULATION AND VALIDATION
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    THERMOPHORETIC
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    User defined functions
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    COAL FIRED BOILERS
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    Model validation
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    Numerical model
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    Radiative transfer