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Hygroscopic behaviour of aerosol particles emitted from biomass fired grate boilers
Växjö University, Faculty of Mathematics/Science/Technology, School of Technology and Design.
Växjö University, Faculty of Mathematics/Science/Technology, School of Technology and Design. (Bioenergiteknik)
Växjö University, Faculty of Mathematics/Science/Technology, School of Technology and Design.
2005 (English)In: Aerosol Science and Technology, ISSN 0278-6826, Vol. 39, no 91, p. 919-930Article in journal (Refereed) Published
Abstract [en]

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 1MWboiler, and 1.5 in the 1.5MWboiler.

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, andK2CO3). Agglomerated particles collapsed and became

more spherical when initially exposed to a moderately high relative

humidity. When diluted with hot particle-free air, the fractallike

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

∼2.5.

Place, publisher, year, edition, pages
Taylor & Francis Group , 2005. Vol. 39, no 91, p. 919-930
National Category
Energy Engineering Chemical Process Engineering
Research subject
Technology (byts ev till Engineering), Bioenergy Technology
Identifiers
URN: urn:nbn:se:vxu:diva-4204DOI: 10.1080/02786820500331068OAI: oai:DiVA.org:vxu-4204DiVA, id: diva2:204161
Available from: 2007-03-01 Created: 2007-03-01 Last updated: 2010-10-25Bibliographically approved

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Saqnati, MehriStrand, MichaelLillieblad, Lena

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