Advanced

Hygroscopic behavior of aerosol particles emitted from biomass fired grate boilers

Rissler, Jenny LU ; Pagels, Joakim LU ; Swietlicki, Erik LU ; Wierzbicka, Aneta LU ; Strand, M; Lillieblad, L; Sanati, Mehri LU and Bohgard, Mats LU (2005) In Aerosol Science and Technology 39(10). p.919-930
Abstract
This study focuses on the hygroscopic properties of submicrometer aerosol particles emitted from two small-scale district heating combustion plants (1 and 1.5 MW) burning two types of biomass fuels (moist forest residue and pellets). The hygroscopic particle diameter growth factor (Gf) was measured when taken from a dehydrated to a humidified state for particle diameters between 30 350 nm (dry size) using a Hygroscopic Tandem Differential Mobility Analyzer (H-TDMA). Particles of a certain dry size all showed similar diameter growth and the Gf at RH = 90% for 110/100 nm particles was 1.68 in the 1 MW boiler, and 1.5 in the 1.5 MW boiler. These growth factors are considerably higher in comparison to other combustion aerosol particles such as... (More)
This study focuses on the hygroscopic properties of submicrometer aerosol particles emitted from two small-scale district heating combustion plants (1 and 1.5 MW) burning two types of biomass fuels (moist forest residue and pellets). The hygroscopic particle diameter growth factor (Gf) was measured when taken from a dehydrated to a humidified state for particle diameters between 30 350 nm (dry size) using a Hygroscopic Tandem Differential Mobility Analyzer (H-TDMA). Particles of a certain dry size all showed similar diameter growth and the Gf at RH = 90% for 110/100 nm particles was 1.68 in the 1 MW boiler, and 1.5 in the 1.5 MW boiler. These growth factors are considerably higher in comparison to other combustion aerosol particles such as diesel exhaust, and are the result of the efficient combustion and the high concentration of alkali species in the fuel. The observed water uptake could be explained using the Zdanovski-Stokes-Robinson (ZSR) mixing rule and a chemical composition of potassium salts only, taken from ion chromatography analysis of filter and impactor samples (KCl, K2SO4, and K2CO3). Agglomerated particles collapsed and became more spherical when initially exposed to a moderately high relative humidity. When diluted with hot particle-free air, the fractal-like structures remained intact until humidified in the H-TDMA. A method to estimate the fractal dimension of the agglomerated combustion aerosol and to convert the measured mobility diameter hygroscopic growth to the more useful property volume diameter growth is presented. The fractal dimension was estimated to be similar to 2.5. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Aerosol Science and Technology
volume
39
issue
10
pages
919 - 930
publisher
Taylor & Francis
external identifiers
  • wos:000233856400001
  • scopus:29744449514
ISSN
1521-7388
DOI
10.1080/02786820500331068
language
English
LU publication?
yes
id
3a819e46-4599-462a-9611-117e1811fe5f (old id 211250)
date added to LUP
2007-08-14 15:23:50
date last changed
2017-10-01 03:36:57
@article{3a819e46-4599-462a-9611-117e1811fe5f,
  abstract     = {This study focuses on the hygroscopic properties of submicrometer aerosol particles emitted from two small-scale district heating combustion plants (1 and 1.5 MW) burning two types of biomass fuels (moist forest residue and pellets). The hygroscopic particle diameter growth factor (Gf) was measured when taken from a dehydrated to a humidified state for particle diameters between 30 350 nm (dry size) using a Hygroscopic Tandem Differential Mobility Analyzer (H-TDMA). Particles of a certain dry size all showed similar diameter growth and the Gf at RH = 90% for 110/100 nm particles was 1.68 in the 1 MW boiler, and 1.5 in the 1.5 MW boiler. These growth factors are considerably higher in comparison to other combustion aerosol particles such as diesel exhaust, and are the result of the efficient combustion and the high concentration of alkali species in the fuel. The observed water uptake could be explained using the Zdanovski-Stokes-Robinson (ZSR) mixing rule and a chemical composition of potassium salts only, taken from ion chromatography analysis of filter and impactor samples (KCl, K2SO4, and K2CO3). Agglomerated particles collapsed and became more spherical when initially exposed to a moderately high relative humidity. When diluted with hot particle-free air, the fractal-like structures remained intact until humidified in the H-TDMA. A method to estimate the fractal dimension of the agglomerated combustion aerosol and to convert the measured mobility diameter hygroscopic growth to the more useful property volume diameter growth is presented. The fractal dimension was estimated to be similar to 2.5.},
  author       = {Rissler, Jenny and Pagels, Joakim and Swietlicki, Erik and Wierzbicka, Aneta and Strand, M and Lillieblad, L and Sanati, Mehri and Bohgard, Mats},
  issn         = {1521-7388},
  language     = {eng},
  number       = {10},
  pages        = {919--930},
  publisher    = {Taylor & Francis},
  series       = {Aerosol Science and Technology},
  title        = {Hygroscopic behavior of aerosol particles emitted from biomass fired grate boilers},
  url          = {http://dx.doi.org/10.1080/02786820500331068},
  volume       = {39},
  year         = {2005},
}