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

Henrik Hofgren, Bengt Sundén

Research output: Chapter in Book/Report/Conference proceedingPaper in conference proceedingpeer-review

2 Citations (SciVal)

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.
Original languageEnglish
Title of host publicationASME 2013 International Mechanical Engineering Congress and Exposition Volume 8A: Heat Transfer and Thermal Engineering
PublisherAmerican Society Of Mechanical Engineers (ASME)
PagesV08AT09A002
Volume8A
ISBN (Print)978-0-7918-5634-5
DOIs
Publication statusPublished - 2014
EventASME International Mechanical Engineering Congress and Exposition, 2013 - San Diego, CA, United States
Duration: 2013 Nov 152013 Nov 21

Publication series

Name
Volume8A

Conference

ConferenceASME International Mechanical Engineering Congress and Exposition, 2013
Abbreviated titleIMECE2013
Country/TerritoryUnited States
CitySan Diego, CA
Period2013/11/152013/11/21

Subject classification (UKÄ)

  • Energy Engineering

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