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Mechanisms behind the positive effects on bed agglomeration and deposit formation combusting forest residue with peat additives in fluidized beds
Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics, Energy Technology and Thermal Process Chemistry.
Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics, Energy Technology and Thermal Process Chemistry.
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2009 (English)In: Energy & Fuels, ISSN 0887-0624, E-ISSN 1520-5029, Vol. 23, no 9, 4245-4253 p.Article in journal (Refereed) Published
Abstract [en]

A compilation was made of the composition of peat from different areas in Sweden, or which a selected But was characterized anal co-combusted with forest residue ill controlled fludized-bed agglomeration tests with extensive particle sampling, The variation in ash-forming elements in the different peat samples was large; thus, eight peat samples were selected from the compilation to represent the variation in peat composition in Sweden. These samples were characterized in terms of botanical composition, analyzed for ash-forming elements, and oxidized using a low-temperature ashing procedure, followed by characterization using scanning electron microscopy/electron-dispersive spectroscopy (SEM/EDS) and X-ray diffraction (XRD). The selected peat samples had in common the presence of Et small fraction of crystalline phases, such as quartz, microcline, albite, and calcium sulfate. The controlled fluidized-bed agglomeration tests that co-combusted forest residue with peat resulted ill a significant increase it) agglomeration temperatures compared to combusting forest residue alone. Plausible explanations for this were in increase of calcium, iron, Or aluminum in the bed particle layers and/or the reaction of potassium with clay minerals, which prevented the formation of low molting bed particle layers, The effects oil particle and deposit formation during co-combustion were reduced amounts of rule particles and all increased number of coarse particles, The mechanisms for the positive effects were a transfer and/or removal of potassium ill the gas phase to it loss reactive particular form via sorption and/or it reaction with the reactive peat ash (SiO2 and CaO), which in most cases formed larger particles (> 1 mu m) containing calcium silicon and Potassium.

Place, publisher, year, edition, pages
American Chemical Society , 2009. Vol. 23, no 9, 4245-4253 p.
URN: urn:nbn:se:umu:diva-38566DOI: 10.1021/ef900146eISI: 000270671500006OAI: diva2:379634
Available from: 2010-12-19 Created: 2010-12-19 Last updated: 2011-01-28Bibliographically approved

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Pommer, LindaBoström, DanBackman, RainerOlofsson, IngemarNordin, Anders
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