Header menu link for other important links
X
Comprehensive numerical modeling of ignition of coal dust layers in different configurations
Akhilesh Kumar Sahu,
Published in Elsevier Ltd
2015
Volume: 35
   
Issue: 2
Pages: 2355 - 2362
Abstract
Ignition of coal dusts deposited over sufficiently hot surfaces represents a common industrial hazard. If these surfaces are above a minimum threshold temperature, then the heat transfer from them and the associated chemical heat release can cause spontaneous ignition. This ignition front can be an ignition site for nearby combustibles as well, which depends on the location of ignition and the corresponding surface temperature attained by the coal dust. A comprehensive numerical study of ignition process of coal dust layers in different configurations, by solving the coupled Navier-Stokes and energy equations, provides a clear insight of the thermal field in the coal layer as well as the flow field over the coal surface. Such study will also provide quantitative information about the convective heat transfer coefficient, which varies for different cases. In this study, ignition phenomena of coal dusts deposited over a flat plate, wedges of different angles and a 3D corner, have been analyzed using a comprehensive numerical model. The governing equations are solved using Ansys FLUENT and user defined functions. The model has been validated using experimental results and is used to study the effect of wedge angles and the direction of gravity vector on the ignition process. © 2014 The Combustion Institute. Published by Elsevier Inc. All rights reserved.
About the journal
JournalData powered by TypesetProceedings of the Combustion Institute
PublisherData powered by TypesetElsevier Ltd
ISSN15407489
Open AccessNo
Concepts (19)
  •  related image
    Atmospheric temperature
  •  related image
    Coal
  •  related image
    Coal combustion
  •  related image
    Heat convection
  •  related image
    Heat transfer
  •  related image
    Heat transfer coefficients
  •  related image
    Natural convection
  •  related image
    Navier stokes equations
  •  related image
    Numerical models
  •  related image
    SPONTANEOUS COMBUSTION
  •  related image
    Conjugate heat transfer
  •  related image
    Convective heat transfer coefficient
  •  related image
    Quantitative information
  •  related image
    SPONTANEOUS IGNITION
  •  related image
    Surface temperatures
  •  related image
    THRESHOLD TEMPERATURES
  •  related image
    User defined functions
  •  related image
    Wedge angle
  •  related image
    COAL DUST