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Biomass pyrolysis in a heated-grid reactor: Visualization of carbon monoxide and formaldehyde using Laser-Induced Fluorescence

Prins, M. J.; Li, Zhongshan LU ; Bastiaans, R. J. M.; van Oijen, J. A.; Aldén, Marcus LU and de Goey, L. P. H. (2011) In Journal of Analytical and Applied Pyrolysis 92(2). p.280-286
Abstract
The development of improved biomass pyrolysis models is vital for more accurate modelling and design of biomass conversion equipment. Such improved models must be based on reliable experimental data: biomass should be pyrolyzed at high heating rates and the reaction products should be measured using an on-line, non-intrusive method. Therefore, a heated grid reactor with heating rate of 300-600 K/s was used to study pyrolysis of biomass at temperatures in the range of 500-700 degrees C. The formation of formaldehyde and carbon monoxide from wood at high heating rates was successfully visualized using Laser-Induced Fluorescence (LIF). A thin vertical laser line or sheet was present directly above the biomass lying on the heated grid.... (More)
The development of improved biomass pyrolysis models is vital for more accurate modelling and design of biomass conversion equipment. Such improved models must be based on reliable experimental data: biomass should be pyrolyzed at high heating rates and the reaction products should be measured using an on-line, non-intrusive method. Therefore, a heated grid reactor with heating rate of 300-600 K/s was used to study pyrolysis of biomass at temperatures in the range of 500-700 degrees C. The formation of formaldehyde and carbon monoxide from wood at high heating rates was successfully visualized using Laser-Induced Fluorescence (LIF). A thin vertical laser line or sheet was present directly above the biomass lying on the heated grid. Two-photon excitation at 230 nm was applied to induce fluorescence of carbon monoxide present in the volatiles, whereas excitation of formaldehyde was done at 355 nm. Visualization of these compounds shows that the release rises strongly with temperature; this typically happens on a timescale in the order of seconds. In principle, the method described allows for the determination of truly primary products. Future research is recommended, aimed at quantifying the concentrations measured by LIE. Care must be taken to calibrate for quenching of the fluorescence signal. Avoiding secondary reactions taking place in the gas phase is another experimental challenge. (C) 2011 Elsevier B.V. All rights reserved. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
In situ laser spectroscopy, Biomass pyrolysis, Devolatilization, CFD
in
Journal of Analytical and Applied Pyrolysis
volume
92
issue
2
pages
280 - 286
publisher
Elsevier
external identifiers
  • wos:000297386200002
  • scopus:80054047836
ISSN
1873-250X
DOI
10.1016/j.jaap.2011.06.008
language
English
LU publication?
yes
id
23e9caca-e6ee-474b-8821-b43bb2387010 (old id 2272075)
date added to LUP
2011-12-29 14:04:37
date last changed
2017-03-05 03:45:22
@article{23e9caca-e6ee-474b-8821-b43bb2387010,
  abstract     = {The development of improved biomass pyrolysis models is vital for more accurate modelling and design of biomass conversion equipment. Such improved models must be based on reliable experimental data: biomass should be pyrolyzed at high heating rates and the reaction products should be measured using an on-line, non-intrusive method. Therefore, a heated grid reactor with heating rate of 300-600 K/s was used to study pyrolysis of biomass at temperatures in the range of 500-700 degrees C. The formation of formaldehyde and carbon monoxide from wood at high heating rates was successfully visualized using Laser-Induced Fluorescence (LIF). A thin vertical laser line or sheet was present directly above the biomass lying on the heated grid. Two-photon excitation at 230 nm was applied to induce fluorescence of carbon monoxide present in the volatiles, whereas excitation of formaldehyde was done at 355 nm. Visualization of these compounds shows that the release rises strongly with temperature; this typically happens on a timescale in the order of seconds. In principle, the method described allows for the determination of truly primary products. Future research is recommended, aimed at quantifying the concentrations measured by LIE. Care must be taken to calibrate for quenching of the fluorescence signal. Avoiding secondary reactions taking place in the gas phase is another experimental challenge. (C) 2011 Elsevier B.V. All rights reserved.},
  author       = {Prins, M. J. and Li, Zhongshan and Bastiaans, R. J. M. and van Oijen, J. A. and Aldén, Marcus and de Goey, L. P. H.},
  issn         = {1873-250X},
  keyword      = {In situ laser spectroscopy,Biomass pyrolysis,Devolatilization,CFD},
  language     = {eng},
  number       = {2},
  pages        = {280--286},
  publisher    = {Elsevier},
  series       = {Journal of Analytical and Applied Pyrolysis},
  title        = {Biomass pyrolysis in a heated-grid reactor: Visualization of carbon monoxide and formaldehyde using Laser-Induced Fluorescence},
  url          = {http://dx.doi.org/10.1016/j.jaap.2011.06.008},
  volume       = {92},
  year         = {2011},
}