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Modeling Thermal Radiation With Focus on Particle Radiation in Grate Fired Furnaces Combusting MSW or Biomass: A Parametric Study

Hofgren, Henrik LU and Sundén, Bengt LU (2014) ASME International Mechanical Engineering Congress and Exposition, 2013 In ASME 2013 International Mechanical Engineering Congress and Exposition Volume 8A: Heat Transfer and Thermal Engineering 8A. p.002-09
Abstract
This parametric study shows that thermal radiation from particles, fly ash and char, can be highly relevant for estimating the radiative heat flux to surfaces in grate fired furnaces, especially to the hot bed. The large effects of particle radiative heat transfer come from cases with municipal solid waste (MSW) as fuel whereas biomass cases have moderate effect on the overall:radiative heat transfer. The parameters investigated in the study were the fuel parameters, representing a variety of particle loads and size distributions, emissivities of walls and bed, and the size of furnace. The investigations were conducted in a 3-D rectangular environment with a fixed temperature field, and homogeneous distribution of gases and particles. The... (More)
This parametric study shows that thermal radiation from particles, fly ash and char, can be highly relevant for estimating the radiative heat flux to surfaces in grate fired furnaces, especially to the hot bed. The large effects of particle radiative heat transfer come from cases with municipal solid waste (MSW) as fuel whereas biomass cases have moderate effect on the overall:radiative heat transfer. The parameters investigated in the study were the fuel parameters, representing a variety of particle loads and size distributions, emissivities of walls and bed, and the size of furnace. The investigations were conducted in a 3-D rectangular environment with a fixed temperature field, and homogeneous distribution of gases and particles. The choice of boundary emissivity was found to be much more or equally important as the particle radiation effects, dependent if biomass or MSW, respectively, was used as the fuel. The effect of particle radiation increased with increasing furnace size, mostly evident in the change of the radiative source term and the heat flux to the bed. Compared to previous studies of particle radiation in grate fired combustion, this study used realistic particle mass size distributions for fly ash. Estimates of char mass size distributions inside the furnace were conducted and used. (Less)
Please use this url to cite or link to this publication:
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organization
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
in
ASME 2013 International Mechanical Engineering Congress and Exposition Volume 8A: Heat Transfer and Thermal Engineering
volume
8A
pages
002 - 09
publisher
American Society Of Mechanical Engineers (ASME)
conference name
ASME International Mechanical Engineering Congress and Exposition, 2013
external identifiers
  • WOS:000360032600002
  • Scopus:84903481952
ISBN
978-0-7918-5634-5
DOI
10.1115/IMECE2013-62882
language
English
LU publication?
yes
id
58dc8a6b-9f46-45d3-8038-82dbf7a8e173 (old id 7972418)
date added to LUP
2015-09-23 13:39:51
date last changed
2017-01-01 08:05:51
@inproceedings{58dc8a6b-9f46-45d3-8038-82dbf7a8e173,
  abstract     = {This parametric study shows that thermal radiation from particles, fly ash and char, can be highly relevant for estimating the radiative heat flux to surfaces in grate fired furnaces, especially to the hot bed. The large effects of particle radiative heat transfer come from cases with municipal solid waste (MSW) as fuel whereas biomass cases have moderate effect on the overall:radiative heat transfer. The parameters investigated in the study were the fuel parameters, representing a variety of particle loads and size distributions, emissivities of walls and bed, and the size of furnace. The investigations were conducted in a 3-D rectangular environment with a fixed temperature field, and homogeneous distribution of gases and particles. The choice of boundary emissivity was found to be much more or equally important as the particle radiation effects, dependent if biomass or MSW, respectively, was used as the fuel. The effect of particle radiation increased with increasing furnace size, mostly evident in the change of the radiative source term and the heat flux to the bed. Compared to previous studies of particle radiation in grate fired combustion, this study used realistic particle mass size distributions for fly ash. Estimates of char mass size distributions inside the furnace were conducted and used.},
  author       = {Hofgren, Henrik and Sundén, Bengt},
  booktitle    = {ASME 2013 International Mechanical Engineering Congress and Exposition Volume 8A: Heat Transfer and Thermal Engineering},
  isbn         = {978-0-7918-5634-5},
  language     = {eng},
  pages        = {002--09},
  publisher    = {American Society Of Mechanical Engineers (ASME)},
  title        = {Modeling Thermal Radiation With Focus on Particle Radiation in Grate Fired Furnaces Combusting MSW or Biomass: A Parametric Study},
  url          = {http://dx.doi.org/10.1115/IMECE2013-62882},
  volume       = {8A},
  year         = {2014},
}