Title:
Fluorides in Deposits
Author(s):
Sandström, K., Boman, C., Weidemann, E., Broström, M.
Document(s):
Paper
Poster
Abstract:
Fluorine is of increasing concern in waste combustion since materials containing fluorinated compounds constitute an increasing share of waste fractions entering combined heat and power plants (CHP). Alkali fluorides could potentially cause similar problems as are well known for the corresponding chlorides. However, there are some fundamental differences in thermodynamic stabilities. Available literature essentially lacks the experimental evidence needed to draw any further conclusions on the extent of any fluorine related problems, but recently a municipal solid waste (MSW)-fired CHP-plant reported alarming deposit growth rates, possibly related to a delivery of fluorine containing fuels. The objective of the present study was to experimentally evaluate some of the thermodynamic considerations mentioned. Fuels were prepared by adding NaCl, NaF and S to softwood pellets. Deposits and aerosol samples were analysed with SEM-EDS and XRD, and evaluated together with fundamental thermodynamic phase equilibrium considerations to provide new and important information on the ash forming reactions and their implications. The results from the combustion experiments showed that the fluorine found on the deposit probe was in form of NaF and Na3F(SO4) in qualitative agreement with thermodynamic equilibrium calculations.
Keywords:
municipal solid waste (MSW), particle emission, combined heat and power generation (CHP)
Topic:
Biomass Resources
Subtopic:
Municipal and industrial wastes
Event:
27th European Biomass Conference and Exhibition
Session:
1AV.2.16
Pages:
152 - 158
ISBN:
978-88-89407-19-6
Paper DOI:
10.5071/27thEUBCE2019-1AV.2.16
Price:
FREE
