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Emissions and deposit properties from combustion of wood pellet with magnesium additives
School of Technology and Business Studies, Dalarna University.
School of Technology and Business Studies, Dalarna University.
(Miljö- och energisystem)
School of Technology and Business Studies, Dalarna University.
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2013 (English)In: Journal of Fuel Chemistry and Technology, ISSN 1872-5813, Vol. 41, no 5, 530-539 p.Article in journal (Refereed) Published
Abstract [en]

This work studies the amount of gaseous and particle emissions and deposits on heat exchanger surfaces in a boiler fired with commercially available pellets and with pellets primed with magnesium oxide and magnesium hydroxide. The combustion experiments were performed on a residential boiler of 20 kW. Substrates placed in the heat exchanger was analysed with SEM-EDX-mapping to evaluate the chemical composition of the deposits. The results show that particle emissions (PM 2.5) using the additives increased by about 50% and the mass of the deposits in the flue gas heat exchanger (excluding loose fly ash) increased by about 25% compared to the combustion of pellets without additives. The amount of additives was found to be eight times higher than the amount of the main alkali metals potassium (K) and sodium (Na) which leads to the assumption that the additives were overdosed and therefore caused the problems reported. The SEM analysis of the substrates placed in the flue gas heat exchanger indicate that the deposits of sodium (Na), potassium (K), chlorine (Cl) and sulphur (S) decrease using the additives. If this was due to the expected chemical reactions or due to the loose fly ash covering the substrates after the test, could not be determined in this study.

Place, publisher, year, edition, pages
2013. Vol. 41, no 5, 530-539 p.
Keyword [en]
softwood pellets, magnesium, additives, particle emissions, deposit formation
National Category
Energy Engineering
Research subject
Environmental and Energy Systems
Identifiers
URN: urn:nbn:se:kau:diva-29703DOI: 10.1016/S1872-5813(13)60029-8OAI: oai:DiVA.org:kau-29703DiVA: diva2:657241
Available from: 2013-10-18 Created: 2013-10-18 Last updated: 2016-01-08Bibliographically approved

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Berghel, Jonas
Energy Engineering

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