Boman, Christoffer

Eriksson, Axel

Lindgren, Robert

Nordin, Erik

Nyström, Robin

Pagels, Joakim

Rissler, Jenny

English

Lund University Publications

LUND UNIVERSITYPO Box 117221 00 Lund+46 46-222 00 00Mixing state and mass mobility relationship of aerosol from small scale biomasscombustionNordin, Erik; Eriksson, Axel; Nyström, Robin; Lindgren, Robert; Rissler, Jenny; Boman,Christoffer; Pagels, Joakim2014Link to publicationCitation for published version (APA):Nordin, E., Eriksson, A., Nyström, R., Lindgren, R., Rissler, J., Boman, C., & Pagels, J. (2014). Mixing state andmass mobility relationship of aerosol from small scale biomass combustion. Abstract OP62-3. Abstract fromInternational Aerosol Conference, 2014, Busan, Korea, Republic of.Total number of authors:7General rightsUnless other specific re-use rights are stated the following general rights apply:Copyright and moral rights for the publications made accessible in the public portal are retained by the authorsand/or other copyright owners and it is a condition of accessing publications that users recognise and abide by thelegal requirements associated with these rights. • Users may download and print one copy of any publication from the public portal for the purpose of private studyor research. • You may not further distribute the material or use it for any profit-making activity or commercial gain • You may freely distribute the URL identifying the publication in the public portalRead more about Creative commons licenses: https://creativecommons.org/licenses/Take down policyIf you believe that this document breaches copyright please contact us providing details, and we will removeaccess to the work immediately and investigate your claim.WCSMO7  2014 International Aerosol Conference Aug. 28 – Sep. 2, 2014 @BEXCO, Busan, Korea   Mixing state and mass mobility relationship of aerosol from small scale biomass combustion  Erik Z. Nordin1, Axel C. Eriksson2, Robin Nyström3. Robert Lindgren3, Jenny Rissler1, Christoffer Boman3 and  Joakim H. Pagels1  1Ergonomics and Aerosol Technology, Lund University, Sweden 2Nuclear Physics, Lund University, Sweden 3Thermochemical Energy Conversion Laboratory, Dept. of Applied Physics and Electronics, Umeå University,  Sweden  Keywords: biomass, combustion, APM, mass-mobility   Health effects from biomass combustion aerosol are expected to be dependent on the chemical composition, shape and size of the particles. Bølling et al. (2009) identified three main classes of biomass combustion aerosol in a simplified model; organics, soot and inorganic ash. The aim of this study was to determine the mass mobility relationship, mixing state of biomass combustion aerosol and its connection to chemical composition.   Emissions from batch wise operation of a conventional wood stove (WS) were diluted and transferred to a chamber. In addition a modern pellet boiler (PB) was used, where the emissions were sampled directly from the dilution system. The concentrations of CO, O2 and NO (table 1) were measured in the undiluted flue gases. A Differential Mobility Analyzer (DMA) – Aerosol Particle Mass analyzer (APM) setup was used for determining the mass mobility relationship of the aerosol in the chamber. An optional thermo-denuder placed between the DMA and APM, was used to determine the remaining mass fraction at 300°C. The aerosol was further characterized on-line by a SP-AMS and SMPS. Particles were collected on substrates and filters for TEM and OC/EC analysis.    Table 1. Combustion conditions (average) Appliance Phase CO [ppm] O2 [%] NO [ppm] WS Start-up 6200 19.5 3  Flaming  1100 10.7 57 PB Continuous 200 8.2 83  Figure 1 shows the effective density (𝜌𝑒𝑓𝑓) of the aerosol from three phases of wood stove combustion and continuous (nominal) operation of the pellet boiler. The aerosols in the figure can be grouped into three types of particles according to their size dependent density. 1) Particles with an 𝜌𝑒𝑓𝑓~1.9 g cm-3, 2) particles with an 𝜌𝑒𝑓𝑓 ~1.2 g cm-3 and 3) particles with decreasing effective density with increasing particle size. The three types is interpreted as particles dominated by salt (bulk density for KCL ~2 g cm-3) (1), organic droplets (within range of typical organic aerosol density) (2) and soot aggregates (similar to Park et al. (2003)) (3).     Figure 1. Effective density. The marker diameter is proportional to the relative number concentration at that size for each experiment.   Pure salt particles are only observed in emissions from the pellet boiler, which can be explained by the more favorable combustion conditions in that appliance. Organic particles were present during start-up presumably formed by wood pyrolysis products during cold combustion conditions. Soot aggregates were emitted during the flaming phase when the flame temperature is higher but with deficiency of air supply and/or bad mixing in the stove.  Acknowledgements This work was supported by the Swedish research council FORMAS.  References Bølling A.K. et al., (2009) Part Fibre Toxicol, 6, 29.  Park et al. (2003) Environ. Sci. Technol., 37, 577-583 

Mixing state and mass mobility relationship of aerosol from small scale biomass combustion

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Mixing state and mass mobility relationship of aerosol from small scale biomass combustion

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