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Time-resolved analysis of particle emissions from residential biomass combustion – Emissions of refractory black carbon, PAHs and organic tracers

Elbæk Nielsen, Ingeborg; Eriksson, Axel C. LU ; Lindgren, Robert; Martinsson, Johan LU ; Nyström, Robin; Nordin, Erik Z. LU ; Sadiktsis, Ioannis; Boman, Christoffer; Nøjgaard, Jacob K. and Pagels, Joakim LU (2017) In Atmospheric Environment 165. p.179-190
Abstract

Time-resolved particle emissions from a conventional wood stove were investigated with aerosol mass spectrometry to provide links between combustion conditions, emission factors, mixing state of refractory black carbon and implications for organic tracer methods. The addition of a new batch of fuel results in low temperature pyrolysis as the fuel heats up, resulting in strong, short-lived, variable emission peaks of organic aerosol-containing markers of anhydrous sugars, such as levoglucosan (fragment at m/z 60). Flaming combustion results in emissions dominated by refractory black carbon co-emitted with minor fractions of organic aerosol and markers of anhydrous sugars. Full cycle emissions are an external mixture of larger organic... (More)

Time-resolved particle emissions from a conventional wood stove were investigated with aerosol mass spectrometry to provide links between combustion conditions, emission factors, mixing state of refractory black carbon and implications for organic tracer methods. The addition of a new batch of fuel results in low temperature pyrolysis as the fuel heats up, resulting in strong, short-lived, variable emission peaks of organic aerosol-containing markers of anhydrous sugars, such as levoglucosan (fragment at m/z 60). Flaming combustion results in emissions dominated by refractory black carbon co-emitted with minor fractions of organic aerosol and markers of anhydrous sugars. Full cycle emissions are an external mixture of larger organic aerosol-dominated and smaller thinly coated refractory black carbon particles. A very high burn rate results in increased full cycle mass emission factors of 66, 2.7, 2.8 and 1.3 for particulate polycyclic aromatic hydrocarbons, refractory black carbon, total organic aerosol and m/z 60, respectively, compared to nominal burn rate. Polycyclic aromatic hydrocarbons are primarily associated with refractory black carbon-containing particles. We hypothesize that at very high burn rates, the central parts of the combustion zone become air starved, leading to a locally reduced combustion temperature that reduces the conversion rates from polycyclic aromatic hydrocarbons to refractory black carbon. This facilitates a strong increase of polycyclic aromatic hydrocarbons emissions. At nominal burn rates, full cycle emissions based on m/z 60 correlate well with organic aerosol, refractory black carbon and particulate matter. However, at higher burn rates, m/z 60 does not correlate with increased emissions of polycyclic aromatic hydrocarbons, refractory black carbon and organic aerosol in the flaming phase. The new knowledge can be used to advance source apportionment studies, reduce emissions of genotoxic compounds and model the climate impacts of refractory black carbon, such as absorption enhancement by lensing.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Black carbon, Levoglucosan, PAHs, Residential biomass combustion, SP-AMS
in
Atmospheric Environment
volume
165
pages
12 pages
publisher
Elsevier
external identifiers
  • scopus:85021637622
  • wos:000407665500016
ISSN
1352-2310
DOI
10.1016/j.atmosenv.2017.06.033
language
English
LU publication?
yes
id
b1d43793-1f9e-49cb-8723-4d1f32cdff27
date added to LUP
2017-07-20 06:59:43
date last changed
2018-04-05 11:46:43
@article{b1d43793-1f9e-49cb-8723-4d1f32cdff27,
  abstract     = {<p>Time-resolved particle emissions from a conventional wood stove were investigated with aerosol mass spectrometry to provide links between combustion conditions, emission factors, mixing state of refractory black carbon and implications for organic tracer methods. The addition of a new batch of fuel results in low temperature pyrolysis as the fuel heats up, resulting in strong, short-lived, variable emission peaks of organic aerosol-containing markers of anhydrous sugars, such as levoglucosan (fragment at m/z 60). Flaming combustion results in emissions dominated by refractory black carbon co-emitted with minor fractions of organic aerosol and markers of anhydrous sugars. Full cycle emissions are an external mixture of larger organic aerosol-dominated and smaller thinly coated refractory black carbon particles. A very high burn rate results in increased full cycle mass emission factors of 66, 2.7, 2.8 and 1.3 for particulate polycyclic aromatic hydrocarbons, refractory black carbon, total organic aerosol and m/z 60, respectively, compared to nominal burn rate. Polycyclic aromatic hydrocarbons are primarily associated with refractory black carbon-containing particles. We hypothesize that at very high burn rates, the central parts of the combustion zone become air starved, leading to a locally reduced combustion temperature that reduces the conversion rates from polycyclic aromatic hydrocarbons to refractory black carbon. This facilitates a strong increase of polycyclic aromatic hydrocarbons emissions. At nominal burn rates, full cycle emissions based on m/z 60 correlate well with organic aerosol, refractory black carbon and particulate matter. However, at higher burn rates, m/z 60 does not correlate with increased emissions of polycyclic aromatic hydrocarbons, refractory black carbon and organic aerosol in the flaming phase. The new knowledge can be used to advance source apportionment studies, reduce emissions of genotoxic compounds and model the climate impacts of refractory black carbon, such as absorption enhancement by lensing.</p>},
  author       = {Elbæk Nielsen, Ingeborg and Eriksson, Axel C. and Lindgren, Robert and Martinsson, Johan and Nyström, Robin and Nordin, Erik Z. and Sadiktsis, Ioannis and Boman, Christoffer and Nøjgaard, Jacob K. and Pagels, Joakim},
  issn         = {1352-2310},
  keyword      = {Black carbon,Levoglucosan,PAHs,Residential biomass combustion,SP-AMS},
  language     = {eng},
  pages        = {179--190},
  publisher    = {Elsevier},
  series       = {Atmospheric Environment},
  title        = {Time-resolved analysis of particle emissions from residential biomass combustion – Emissions of refractory black carbon, PAHs and organic tracers},
  url          = {http://dx.doi.org/10.1016/j.atmosenv.2017.06.033},
  volume       = {165},
  year         = {2017},
}