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Investigation on the effects of fly ash particles on the thermal radiation in biomass fired boilers

Bahador, Mehdi LU and Sundén, Bengt LU (2008) In International Journal of Heat and Mass Transfer 51(9-10). p.2411-2417
Abstract
Ash is produced in combustion of biomass. Sonic part of this matter is called fly ash and is carried by the flow and causes not only air pollution and erosion, but also call affect the thermal radiation. The effects of fly ash particles oil the thermal radiation are considered ill this investigation. By analyzing sampled data in all electrostatic filter, a realistic particle size distribution is found. Although the optical data oil biomass fly ash are not available, however, similarity between coal and biomass ash compositions showed that the optical constants of the low Fc coal fly ash can be applied for file biomass fly ash. The Mie theory is used to predict scattering and absorption coefficients and phase function. The mean Planck... (More)
Ash is produced in combustion of biomass. Sonic part of this matter is called fly ash and is carried by the flow and causes not only air pollution and erosion, but also call affect the thermal radiation. The effects of fly ash particles oil the thermal radiation are considered ill this investigation. By analyzing sampled data in all electrostatic filter, a realistic particle size distribution is found. Although the optical data oil biomass fly ash are not available, however, similarity between coal and biomass ash compositions showed that the optical constants of the low Fc coal fly ash can be applied for file biomass fly ash. The Mie theory is used to predict scattering and absorption coefficients and phase function. The mean Planck scattering and absorption coefficients and phase function are predicted by averaging over the particle size distribution and Planck function, respectively. The effects of fly ash particles oil thermal radiation are evaluated by a three-dimensional test case. It is assumed that the medium is a mixture of non-grey gases and different level of particle loading. Predicted results from the test case showed that the fly ash can be influential oil the thermal radiation. In addition, in selected fly ash volume fractions, the effect of scattering by particles is not so important oil the radiative heat Source and radiative heat flux to the wall whereas their absorption effect is important and call increase the radiative heat Source and wall heat fluxes. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
non-grey radiation, finite volume method, distribution, particle size, fly ash, thermal radiation, Mie scattering theory
in
International Journal of Heat and Mass Transfer
volume
51
issue
9-10
pages
2411 - 2417
publisher
Pergamon
external identifiers
  • wos:000255811700024
  • scopus:41649099247
ISSN
0017-9310
DOI
10.1016/j.ijheatmasstransfer.2007.08.013
language
English
LU publication?
yes
id
9fa8deae-755f-40da-8793-a22894194a74 (old id 1203697)
date added to LUP
2008-09-17 10:36:37
date last changed
2017-09-24 03:48:36
@article{9fa8deae-755f-40da-8793-a22894194a74,
  abstract     = {Ash is produced in combustion of biomass. Sonic part of this matter is called fly ash and is carried by the flow and causes not only air pollution and erosion, but also call affect the thermal radiation. The effects of fly ash particles oil the thermal radiation are considered ill this investigation. By analyzing sampled data in all electrostatic filter, a realistic particle size distribution is found. Although the optical data oil biomass fly ash are not available, however, similarity between coal and biomass ash compositions showed that the optical constants of the low Fc coal fly ash can be applied for file biomass fly ash. The Mie theory is used to predict scattering and absorption coefficients and phase function. The mean Planck scattering and absorption coefficients and phase function are predicted by averaging over the particle size distribution and Planck function, respectively. The effects of fly ash particles oil thermal radiation are evaluated by a three-dimensional test case. It is assumed that the medium is a mixture of non-grey gases and different level of particle loading. Predicted results from the test case showed that the fly ash can be influential oil the thermal radiation. In addition, in selected fly ash volume fractions, the effect of scattering by particles is not so important oil the radiative heat Source and radiative heat flux to the wall whereas their absorption effect is important and call increase the radiative heat Source and wall heat fluxes.},
  author       = {Bahador, Mehdi and Sundén, Bengt},
  issn         = {0017-9310},
  keyword      = {non-grey radiation,finite volume method,distribution,particle size,fly ash,thermal radiation,Mie scattering theory},
  language     = {eng},
  number       = {9-10},
  pages        = {2411--2417},
  publisher    = {Pergamon},
  series       = {International Journal of Heat and Mass Transfer},
  title        = {Investigation on the effects of fly ash particles on the thermal radiation in biomass fired boilers},
  url          = {http://dx.doi.org/10.1016/j.ijheatmasstransfer.2007.08.013},
  volume       = {51},
  year         = {2008},
}