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Effect of Volatile Reactions on the Thermochemical Conversion of Biomass Particles

Hesameddin, Fatehi LU ; Qu, Zhechao; Schmidt, Florian M. and Bai, Xue Song LU (2017) In Energy Procedia 105. p.4648-4654
Abstract

A numerical and experimental study on the conversion of a biomass particle is carried out to quantify the effect of homogeneous volatile combustion on the biomass pyrolysis. The numerical domain consists of a particle and its surrounding and the model considers detailed chemical kinetic mechanism for reaction of pyrolysis products. A detailed pyrolysis model is employed which provides the composition of pyrolysis products. The effect of gas phase reaction on the conversion time and temperature of the particle is analyzed and it was shown that the gas phase reactions results in shorter pyrolysis time. H2O mole fraction and temperature above a biomass pellet from wheat straw (WS) and stem wood (SW) were experimentally measured... (More)

A numerical and experimental study on the conversion of a biomass particle is carried out to quantify the effect of homogeneous volatile combustion on the biomass pyrolysis. The numerical domain consists of a particle and its surrounding and the model considers detailed chemical kinetic mechanism for reaction of pyrolysis products. A detailed pyrolysis model is employed which provides the composition of pyrolysis products. The effect of gas phase reaction on the conversion time and temperature of the particle is analyzed and it was shown that the gas phase reactions results in shorter pyrolysis time. H2O mole fraction and temperature above a biomass pellet from wheat straw (WS) and stem wood (SW) were experimentally measured using tunable diode laser absorption spectroscopy (TDLAS) while recording the particle mass loss. The TDLAS data were used to validate the numerical model developed for biomass conversion. The results showed that by considering the gas phase reactions a good agreement between the measurement and the model prediction for mass loss and temperature can be achieved. For H2O mole fraction on top of the particle, on the other hand, some discrepancy between the model prediction and the experimental data was observed. Nevertheless, the difference in H2O mole fraction would be much larger by neglecting the gas phase reaction at the particle boundary.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Biomass Particle, Boundary Layer, Combustion, Numerical Modeling
in
Energy Procedia
volume
105
pages
7 pages
publisher
Elsevier
external identifiers
  • scopus:85020698302
ISSN
1876-6102
DOI
10.1016/j.egypro.2017.03.1007
language
English
LU publication?
yes
id
3dd219df-b79c-4b9e-9282-3776384756ee
date added to LUP
2017-07-05 08:36:56
date last changed
2017-07-05 08:36:56
@article{3dd219df-b79c-4b9e-9282-3776384756ee,
  abstract     = {<p>A numerical and experimental study on the conversion of a biomass particle is carried out to quantify the effect of homogeneous volatile combustion on the biomass pyrolysis. The numerical domain consists of a particle and its surrounding and the model considers detailed chemical kinetic mechanism for reaction of pyrolysis products. A detailed pyrolysis model is employed which provides the composition of pyrolysis products. The effect of gas phase reaction on the conversion time and temperature of the particle is analyzed and it was shown that the gas phase reactions results in shorter pyrolysis time. H<sub>2</sub>O mole fraction and temperature above a biomass pellet from wheat straw (WS) and stem wood (SW) were experimentally measured using tunable diode laser absorption spectroscopy (TDLAS) while recording the particle mass loss. The TDLAS data were used to validate the numerical model developed for biomass conversion. The results showed that by considering the gas phase reactions a good agreement between the measurement and the model prediction for mass loss and temperature can be achieved. For H<sub>2</sub>O mole fraction on top of the particle, on the other hand, some discrepancy between the model prediction and the experimental data was observed. Nevertheless, the difference in H<sub>2</sub>O mole fraction would be much larger by neglecting the gas phase reaction at the particle boundary.</p>},
  author       = {Hesameddin, Fatehi and Qu, Zhechao and Schmidt, Florian M. and Bai, Xue Song},
  issn         = {1876-6102},
  keyword      = {Biomass Particle,Boundary Layer,Combustion,Numerical Modeling},
  language     = {eng},
  pages        = {4648--4654},
  publisher    = {Elsevier},
  series       = {Energy Procedia},
  title        = {Effect of Volatile Reactions on the Thermochemical Conversion of Biomass Particles},
  url          = {http://dx.doi.org/10.1016/j.egypro.2017.03.1007},
  volume       = {105},
  year         = {2017},
}