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Hygroscopic behaviour of aerosol particles emitted from biomass fired grate boilers

Abstract

This study focuses on the hygroscopic properties of sub-micrometer 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 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 hygroscopic growth and the average diameter growth at RH=90% for 110/100 nm particles was 1.68 in the 1 MW boiler, and 1.52 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 Zdanovskii-Stokes-Robinson (ZSR) mixing rule and a chemical composition of only potassium salts, taken from an Ion Chromatography analysis of filter sample (KCl, K{sub 2}SO{sub 4}, and K{sub 2}CO{sub 3}). Agglomerated particles collapsed and became more spherical when initially exposed to a moderately high relative humidity. When diluting with hot particle-free air, the fractal-like structures  More>>
Authors:
Rissler, Jenny; Swietlicki, Erik; [1]  Pagels, Joakim; Wierzbicka, Aneta; Bohgard, Mats; [2]  Strand, Michael; Lillieblad, Lena; Sanati, Mehri [3] 
  1. Lund Univ. (Sweden). Div. of Nuclear Physics
  2. Lund Univ. (Sweden). Div. of Ergonomics and Aerosol Technology
  3. Vaexjoe Univ. (Sweden). Bioenergy Technology
Publication Date:
Feb 01, 2005
Product Type:
Technical Report
Report Number:
STEM-BIOK-05-6
Resource Relation:
Other Information: 46 refs., 12 figs., 1 tab; PBD: Feb 2005
Subject:
09 BIOMASS FUELS; HYGROSCOPICITY; WOOD FUELS; COMBUSTION; AEROSOLS; POTASSIUM COMPOUNDS; AIR POLLUTION; PARTICULATES
OSTI ID:
20588024
Research Organizations:
Swedish Energy Agency, Eskilstuna (Sweden)
Country of Origin:
Sweden
Language:
English
Other Identifying Numbers:
Other: Project STEM-P21848-1; TRN: SE0507126
Availability:
Also available from: Studsvik Library, SE-611 82 Nykoeping, Sweden (SEK 75); Commercial reproduction prohibited; OSTI as DE20588024
Submitting Site:
SWD
Size:
46 pages
Announcement Date:

Citation Formats

Rissler, Jenny, Swietlicki, Erik, Pagels, Joakim, Wierzbicka, Aneta, Bohgard, Mats, Strand, Michael, Lillieblad, Lena, and Sanati, Mehri. Hygroscopic behaviour of aerosol particles emitted from biomass fired grate boilers. Sweden: N. p., 2005. Web.
Rissler, Jenny, Swietlicki, Erik, Pagels, Joakim, Wierzbicka, Aneta, Bohgard, Mats, Strand, Michael, Lillieblad, Lena, & Sanati, Mehri. Hygroscopic behaviour of aerosol particles emitted from biomass fired grate boilers. Sweden.
Rissler, Jenny, Swietlicki, Erik, Pagels, Joakim, Wierzbicka, Aneta, Bohgard, Mats, Strand, Michael, Lillieblad, Lena, and Sanati, Mehri. 2005. "Hygroscopic behaviour of aerosol particles emitted from biomass fired grate boilers." Sweden.
@misc{etde_20588024,
title = {Hygroscopic behaviour of aerosol particles emitted from biomass fired grate boilers}
author = {Rissler, Jenny, Swietlicki, Erik, Pagels, Joakim, Wierzbicka, Aneta, Bohgard, Mats, Strand, Michael, Lillieblad, Lena, and Sanati, Mehri}
abstractNote = {This study focuses on the hygroscopic properties of sub-micrometer 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 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 hygroscopic growth and the average diameter growth at RH=90% for 110/100 nm particles was 1.68 in the 1 MW boiler, and 1.52 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 Zdanovskii-Stokes-Robinson (ZSR) mixing rule and a chemical composition of only potassium salts, taken from an Ion Chromatography analysis of filter sample (KCl, K{sub 2}SO{sub 4}, and K{sub 2}CO{sub 3}). Agglomerated particles collapsed and became more spherical when initially exposed to a moderately high relative humidity. When diluting with hot particle-free air, the fractal-like structures remained intact until humidified in the HTDMA. A method is presented to by which to estimate the fractal dimension of the agglomerated combustion aerosol and correct the measured mobility diameter hygroscopic growth to the more useful property volume growth. The fractal dimension was estimated to be {approx}2.5.}
place = {Sweden}
year = {2005}
month = {Feb}
}