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Design Changes in a Fixed-Bed Pellet Combustion Device: Effects of Temperature and Residence Time on Emission Performance
Energy Technology Centre, Piteå, Sweden; Division of Energy Engineering, Luleå University of Technology, Luleå, Sweden.
Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics, Energy Technology and Thermal Process Chemistry. (ETPC)
Division of Energy Engineering, Luleå University of Technology, Luleå, Sweden.
Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics, Energy Technology and Thermal Process Chemistry. (ETPC)
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2010 (English)In: Energy & Fuels, ISSN 0887-0624, E-ISSN 1520-5029, Vol. 24, no 2, 1333-1340 p.Article in journal (Refereed) Published
Abstract [en]

The use of wood fuel pellets has proven to be well-suited for the small-scale market, enabling controlled and efficient combustion with low emission of products of incomplete combustion (PIC). Still! a potential for further emission reduction exists, and it thorough understanding of the influence of combustion Conditions oil the emission characteristics of air pollutants, such as polycyclic aromatic hydrocarbons (PAHs) and particulate matter (PM), is important. The Objective of the present work was to determine the effect of design changes, i.e., increasing the temperature and/or residence time, on the emission performance and characteristics for a pellet combustion device using a laboratory fixed-bed reactor (< 5 kW) The temperature and residence time after the bed Section were varied according to statistical experimental designs (650-950 degrees C and 0.5-3.0 s) with file emission responses: CO, organic gaseous carbon (OGC), NO, volatile organic compounds (VOCs, 20 compounds), PAHs (43 compounds), PM(tot) mass concentration, fine particle mass/count median diameter (MMD and CMD), and number concentration. The temperature was negatively correlated with the emissions of all studied PIC, with limited effects of the residence time. The PM(tot) emissions of 15-20 mg/MJ were in all cases dominated by fine (< 1 mu m) particles of K, Na, S, Cl, C, O, and Zn. An increased residence time resulted in increased fine particle sizes (i.e., MMD and CMD) and decreased number concentrations. The Importance of a high temperature (> 850 degrees C in the bed zone with intensive, air-rich, and well-mixed Conditions was illustrated for wood pellets combustion with almost a total depletion Of all Studied PIC. The importance of the residence time was shown to be limited, and file results emphasize the need for further verification studies and technology development work.

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2010. Vol. 24, no 2, 1333-1340 p.
National Category
Energy Engineering
Identifiers
URN: urn:nbn:se:umu:diva-109580DOI: 10.1021/ef901023fISI: 000274514400075OAI: oai:DiVA.org:umu-109580DiVA: diva2:858770
Available from: 2015-10-05 Created: 2015-10-01 Last updated: 2017-12-01Bibliographically approved

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Lindmark, FredrikNordin, AndersBoman, Christoffer
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