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Influence of fuel ash composition on high temperature aerosol formation in fixed bed combustion of woody biomass pellets
Energy Technology Centre, Piteå.ORCID iD: 0000-0002-9395-9928
Energy Technology Centre, Piteå.ORCID iD: 0000-0002-6958-5508
Umeå universitet.
Umeå universitet.
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2007 (English)In: Fuel, ISSN 0016-2361, E-ISSN 1873-7153, Vol. 86, no 1, p. 181-193Article in journal (Refereed) Published
Abstract [en]

In this work, the influence of fuel ash composition on high temperature aerosol formation during fixed bed combustion of woody biomass (two wood pellets and one bark pellets) were investigated experimentally in a laboratory reactor and theoretically through chemical equilibrium model calculations. For all fuels, the particle mass size distribution in the PM2.5 region was bimodal, with one fine mode and one coarse mode. Early in the flame, the fine mode was dominated by particles from incomplete combustion and these particles were rapidly oxidised in the post flame zone. After the hot flame, the fine mode concentration and the particle diameter increases gradually when the temperature decreases due to condensation of vaporised inorganic matter, K, Na, S, Cl, and Zn. For two of the fuels also P could be found in the fine particles. The coarse mode consisted of carbon, refractory metals and considerable amount of alkali. Further, the initial fuel alkali concentration and the alkali to silicon ratio (K + Na)/Si influenced the amount of vaporised aerosol forming alkali matter. Finally, the present study shows that, combustion temperature and fuel ash composition is of major importance for the formation of high temperature aerosols in fixed bed combustion of woody biomass pellets.

Place, publisher, year, edition, pages
2007. Vol. 86, no 1, p. 181-193
National Category
Energy Engineering
Research subject
Energy Engineering
Identifiers
URN: urn:nbn:se:ltu:diva-5323DOI: 10.1016/j.fuel.2006.07.001Local ID: 363b6300-4b2f-11dc-ac5f-000ea68e967bOAI: oai:DiVA.org:ltu-5323DiVA, id: diva2:978197
Note
Upprättat; 2007; 20070815 (ysko)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-05-02Bibliographically approved

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Wiinikka, HenrikGebart, RikardÖhman, Marcus

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