Towards better prediction of ash related problems in biomass combustion via improved fuel analysis

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Title Towards better prediction of ash related problems in biomass combustion via improved fuel analysis
Creator Werkelin, Johan; Hupa, Mikko
Publication type report
Publisher American Flame Research Committee (AFRC)
Program American Flame Research Committee (AFRC)
Date 2009
Description Future biomass combustion systems should be fuel flexible. To avoid operational problems such as fouling, slagging, fluidized bed agglomeration, and corrosion, the relation between ash behaviour and fuel composition needs to be known. Ash-related problems are strongly coupled to phase transitions. Molten or partly molten ash is sticky and cause furnace-wall slagging, heat exchanger corrosion, or severe bed agglomeration. Vaporisation of ash species leads to fouling in the boiler when ash condenses on heat exchanger tubes. The extent of these phase transitions can be determined based on the chemical composition of the ash. Our search for better prediction tools includes the following four steps. Conventional fuel analyses give the fuel element composition. The bulk fuel element concentrations determine the amount of ash formed and its average composition (1). Element analysis of fuel fractions (i.e. different particle sizes, seams, plant tissues or other distinct fuel components) gives information on the composition of individual ash particles and helps identifying problematic fuel fractions (2). Global equilibrium calculations allow quantification of the problematic ash fractions (3). Kinetic restrictions to the equilibrium (4) can be considered by applying advanced fuel analyses, such as chemical fraction analysis (CFA) or computer-controlled scanning electron microscopy (CC-SEM). Advanced fuel analyses determine the ash-forming matter in the fuel: the mineral, salts and organically associated ash-forming elements. In this paper, these predictions methods are applied on a forest residue fuel fired in Scandinavia.
Type Text
Format application/pdf
Language eng
OCR Text Show
Metadata Cataloger CLR; AM
ARK ark:/87278/s6t77kkp
Relation has part Werkelin, J., & Hupa, M. (2009). Towards better prediction of ash related problems in biomass combustion via improved fuel analysis.American Flame Research Committee (AFRC).
Format medium application/pdf
Rights management (c)American Flame Research Committee (AFRC)
Setname uu_afrc
Date Created 2020-02-11
Date Modified 2020-02-11
ID 1525776
Reference URL https://collections.lib.utah.edu/ark:/87278/s6t77kkp
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