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Laboratory evaluation of a gasifier particle sampling system using model compounds of different particle morphology

Nilsson, Patrik LU ; Malik, Azhar LU ; Pagels, Joakim LU ; Lindskog, Magnus; Rissler, Jenny LU ; Gudmundsson, Anders LU ; Bohgard, Mats LU and Sanati, Mehri LU (2011) In Biomass Conversion & Biorefinery
Abstract
The objective of this work was to design and evaluate an experimental setup to be used for field studies of particle formation in biomass gasification processes. The setup includes a high-temperature dilution probe and a denuder to separate solid particles from condensable volatile material. The efficiency of the setup to remove volatile material from the sampled stream and the influence from condensation on particles with different morphologies is presented. In order to study the sampling setup model, aerosols were created with a nebulizer to produce compact and solid KCl particles and a diffusion flame burner to produce agglomerated and irregular soot particles. The nebulizer and soot generator was followed by an evaporation–condensation... (More)
The objective of this work was to design and evaluate an experimental setup to be used for field studies of particle formation in biomass gasification processes. The setup includes a high-temperature dilution probe and a denuder to separate solid particles from condensable volatile material. The efficiency of the setup to remove volatile material from the sampled stream and the influence from condensation on particles with different morphologies is presented. In order to study the sampling setup model, aerosols were created with a nebulizer to produce compact and solid KCl particles and a diffusion flame burner to produce agglomerated and irregular soot particles. The nebulizer and soot generator was followed by an evaporation–condensation section where volatile material, dioctylsebacete (DOS), was added to the system as a tar model compound. The model aerosol particles were heated to 200°C to create a system containing both solid particles and volatile organic material in gas phase. The heated aerosol particles were sampled and diluted at the same temperature with the dilution probe. Downstream the probe, the DOS was adsorbed in the denuder. This was achieved by slowly decreasing the temperature of the diluted sample towards ambient level in the denuder. Thereby the supersaturation of organic vapors was reduced which decreased the probability for tar condensation and nucleation of new particles. Both the generation system and the sampling technique gave reproducible results. A DOS collection efficiency of >99% was achieved if the denuder inlet concentration was diluted to less than 1–6 mg/m3 depending on the denuder flow rate. Concentrations higher than that lead to significant impact on the resulting KCl size distribution. The choice of model compounds was done to study the effect from the particle morphology on the achieved particle characteristics after the sampling setup. When similar amounts of volatile material condensed on soot agglomerates and compact particles, a substantially smaller growth in mobility diameter was found for soot compared with compact KCl. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
High temperature particle sampling, gasification, biomass, denuder, model aerosol, tar, particle morphology, APM, effective density, soot
in
Biomass Conversion & Biorefinery
publisher
Springer
external identifiers
  • Scopus:84978023514
DOI
10.1007/s13399-011-0010-6
language
English
LU publication?
yes
id
c513589a-ce17-42a2-8759-f511a4aa65fc (old id 1961690)
date added to LUP
2011-05-13 13:37:39
date last changed
2016-10-13 04:45:28
@misc{c513589a-ce17-42a2-8759-f511a4aa65fc,
  abstract     = {The objective of this work was to design and evaluate an experimental setup to be used for field studies of particle formation in biomass gasification processes. The setup includes a high-temperature dilution probe and a denuder to separate solid particles from condensable volatile material. The efficiency of the setup to remove volatile material from the sampled stream and the influence from condensation on particles with different morphologies is presented. In order to study the sampling setup model, aerosols were created with a nebulizer to produce compact and solid KCl particles and a diffusion flame burner to produce agglomerated and irregular soot particles. The nebulizer and soot generator was followed by an evaporation–condensation section where volatile material, dioctylsebacete (DOS), was added to the system as a tar model compound. The model aerosol particles were heated to 200°C to create a system containing both solid particles and volatile organic material in gas phase. The heated aerosol particles were sampled and diluted at the same temperature with the dilution probe. Downstream the probe, the DOS was adsorbed in the denuder. This was achieved by slowly decreasing the temperature of the diluted sample towards ambient level in the denuder. Thereby the supersaturation of organic vapors was reduced which decreased the probability for tar condensation and nucleation of new particles. Both the generation system and the sampling technique gave reproducible results. A DOS collection efficiency of >99% was achieved if the denuder inlet concentration was diluted to less than 1–6 mg/m3 depending on the denuder flow rate. Concentrations higher than that lead to significant impact on the resulting KCl size distribution. The choice of model compounds was done to study the effect from the particle morphology on the achieved particle characteristics after the sampling setup. When similar amounts of volatile material condensed on soot agglomerates and compact particles, a substantially smaller growth in mobility diameter was found for soot compared with compact KCl.},
  author       = {Nilsson, Patrik and Malik, Azhar and Pagels, Joakim and Lindskog, Magnus and Rissler, Jenny and Gudmundsson, Anders and Bohgard, Mats and Sanati, Mehri},
  keyword      = {High temperature particle sampling,gasification,biomass,denuder,model aerosol,tar,particle morphology,APM,effective density,soot},
  language     = {eng},
  publisher    = {ARRAY(0x7ab34e8)},
  series       = {Biomass Conversion & Biorefinery},
  title        = {Laboratory evaluation of a gasifier particle sampling system using model compounds of different particle morphology},
  url          = {http://dx.doi.org/10.1007/s13399-011-0010-6},
  year         = {2011},
}