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

A compilation was made of the composition of peat from different areas in Sweden, of which a selected set was characterized and co-combusted with forest residue in controlled fluidized-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 a 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 in a significant increase in agglomeration temperatures compared to combusting forest residue alone. Plausible explanations for this were an 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-melting bed particle layers. The effects on particle and deposit formation during co-combustion were reduced amounts of fine particles and an increased number of coarse particles. The mechanisms for the positive effects were a transfer and/or removal of potassium in the gas phase to a less reactive particular form via sorption and/or a reaction with the reactive peat ash (SiO2 and CaO), which in most cases formed larger particles (>1 μm) containing calcium silicon and potassium.

Place, publisher, year, edition, pages
2009. Vol. 23, no 9, p. 4245-4253
Keywords [en]
Engineering mechanics - Mechanical and thermal engineering
Keywords [sv]
Teknisk mekanik - Mekanisk och termisk energiteknik
National Category
Energy Engineering
Research subject
Energy Engineering
Identifiers
URN: urn:nbn:se:ltu:diva-6255DOI: 10.1021/ef900146eScopus ID: 2-s2.0-77953181613Local ID: 4751ad20-8f34-11de-8da0-000ea68e967bOAI: oai:DiVA.org:ltu-6255DiVA, id: diva2:979132
Note
Validerad; 2009; 20090822 (ohmmar)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved

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Öhman, Marcus

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