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Modelling of pulverised wood combustion using a functional group model

Elfasakhany, Ashraf LU ; Klason, Torbern LU and Bai, Xue-Song LU (2008) In Combustion Theory and Modelling 12(5). p.883-904
Abstract
Modelling of pulverised wood flames in a laboratory vertical furnace was carried out. The aim was to gain deeper understanding of the combustion process and to validate a mathematical model to simulate the process. Pulverised wood combustion involves many different processes such as two-phase flow dynamics, drying and devolatilisation of the particles, oxidation of the volatile and formation and oxidation of char. It is desirable to know which are the most dominating/sensitive processes that control the combustion behaviour and in particular the emissions of unburned hydrocarbons and carbon monoxide. To achieve this goal, a comprehensive devolatilisation model based on the functional group concept is applied to predict the details of the... (More)
Modelling of pulverised wood flames in a laboratory vertical furnace was carried out. The aim was to gain deeper understanding of the combustion process and to validate a mathematical model to simulate the process. Pulverised wood combustion involves many different processes such as two-phase flow dynamics, drying and devolatilisation of the particles, oxidation of the volatile and formation and oxidation of char. It is desirable to know which are the most dominating/sensitive processes that control the combustion behaviour and in particular the emissions of unburned hydrocarbons and carbon monoxide. To achieve this goal, a comprehensive devolatilisation model based on the functional group concept is applied to predict the details of the devolatilisation products including tar. The solid-gas coupling is made using the Eulerian/Lagrangian approach. A 'rocket force' model is developed to account for the influence of drying and devolatilisation on the particle motion. The present mathematical model successfully simulated the flame temperature and detailed species distributions including CH4 and CO. These two species were shown to be sensitive to the fate of tar. Major paths for the CO formation were identified as the devolatilisation of the wood particles and the char oxidation. Influences of the initial functional group yield, the char oxidation and gasification reactions, the turbulence mixing rate and the fuel particle size on the flame structures andb emissions were examined. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
CO emissions, pulverised wood, non-spherical particle, devolatilisation, functional groups
in
Combustion Theory and Modelling
volume
12
issue
5
pages
883 - 904
publisher
Taylor & Francis
external identifiers
  • wos:000259622200004
  • scopus:53249117271
ISSN
1364-7830
DOI
10.1080/13647830802094344
language
English
LU publication?
yes
id
7fc22623-6d16-4332-95b3-7dfa842da240 (old id 1286780)
date added to LUP
2009-01-29 15:49:12
date last changed
2017-04-23 03:43:42
@article{7fc22623-6d16-4332-95b3-7dfa842da240,
  abstract     = {Modelling of pulverised wood flames in a laboratory vertical furnace was carried out. The aim was to gain deeper understanding of the combustion process and to validate a mathematical model to simulate the process. Pulverised wood combustion involves many different processes such as two-phase flow dynamics, drying and devolatilisation of the particles, oxidation of the volatile and formation and oxidation of char. It is desirable to know which are the most dominating/sensitive processes that control the combustion behaviour and in particular the emissions of unburned hydrocarbons and carbon monoxide. To achieve this goal, a comprehensive devolatilisation model based on the functional group concept is applied to predict the details of the devolatilisation products including tar. The solid-gas coupling is made using the Eulerian/Lagrangian approach. A 'rocket force' model is developed to account for the influence of drying and devolatilisation on the particle motion. The present mathematical model successfully simulated the flame temperature and detailed species distributions including CH4 and CO. These two species were shown to be sensitive to the fate of tar. Major paths for the CO formation were identified as the devolatilisation of the wood particles and the char oxidation. Influences of the initial functional group yield, the char oxidation and gasification reactions, the turbulence mixing rate and the fuel particle size on the flame structures andb emissions were examined.},
  author       = {Elfasakhany, Ashraf and Klason, Torbern and Bai, Xue-Song},
  issn         = {1364-7830},
  keyword      = {CO emissions,pulverised wood,non-spherical particle,devolatilisation,functional groups},
  language     = {eng},
  number       = {5},
  pages        = {883--904},
  publisher    = {Taylor & Francis},
  series       = {Combustion Theory and Modelling},
  title        = {Modelling of pulverised wood combustion using a functional group model},
  url          = {http://dx.doi.org/10.1080/13647830802094344},
  volume       = {12},
  year         = {2008},
}