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Fluorine reactions in MSW combustion
Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics. (Thermochemical Energy Conversion Laboratory)
Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics. (Thermochemical Energy Conversion Laboratory (TEC-Lab))ORCID iD: 0000-0003-1095-9154
2019 (English)In: EUBCE 2019, 2019Conference paper, Poster (with or without abstract) (Other academic)
Abstract [en]

Fluorine is of increasing concern in waste combustion since fluorinated plastics constitute anincreasing share of waste fractions entering CHP plants. Alkali fluorides could potentially causesimilar problems as are well known for the corresponding chlorides. However, there are somefundamental differences in thermodynamic stabilities. Available literature essentially lacks theexperimental evidence needed to draw any further conclusions on the extent of any fluorine relatedproblems, but recently a MSW fired CHP reported alarming deposit growth rates, possibly relatedto a delivery of fluorine containing fuels. The objective of the present study was to experimentallyevaluate some of the thermodynamic considerations mentioned. Fuels were prepared by addingNaCl, NaF and S to softwood pellets. Deposit and aerosol samples were analyzed with SEM-EDSand XRD, and evaluated together with fundamental thermodynamic phase equilibriumconsiderations to provide new and important information on the ash forming reactions and theirimplications. The results from the combustion tests showed that the fluorine found on the depositprobe was in form of NaF and Na3F(SO4) in qualitative agreement with thermodynamicequilibrium calculations.

Place, publisher, year, edition, pages
2019.
National Category
Chemical Engineering
Identifiers
URN: urn:nbn:se:umu:diva-162798OAI: oai:DiVA.org:umu-162798DiVA, id: diva2:1346743
Conference
EUBCE 2019, 27th European Biomass Conference & Exhibition, 27-30 May, Lisbon, Portugal
Available from: 2019-08-28 Created: 2019-08-28 Last updated: 2019-09-06Bibliographically approved

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Sandström, KarinBoman, ChristofferBroström, Markus

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