Publication Type Journal Article
Title Slagging and Fouling during Coal and Biomass Cofiring: Chemical Equilibrium Model Applied to FBC
Authors Paula Alexandra Lourenço Teixeira Helena Lopes Ibrahim Gulyurtlu Nuno Lapa Pedro Abelha
Groups
Journal ENERGY \& FUELS
Year 2014
Month January
Volume 28
Number 1
Pages 697-713
Abstract A thermodynamic model was applied to foresee the occurrence of fouling, slagging, and bed agglomeration phenomena during fluidized bed monocombustion of three different types of biomass, namely straw pellets, olive cake, and wood pellets. The cocombustion effect in reducing the occurrence of deposits and agglomerates of blends of 5, 15, and 25\% (wt.) biomass with coal was also assessed. Chemical fractionation was applied to evaluate the reactive and nonreactive fraction of elements in the fuels, which was used to estimate their partition between the freeboard and bottom zone of the boiler. Qualitative and semiquantitative analytical techniques, namely, X-ray diffraction and scanning electronic microscopy energy dispersive spectroscopy were used to compare the results from the simulation with the mineralogical and morphological composition of ash and deposits formed during combustion. The thermodynamic modeling revealed to be a powerful tool in foreseeing the formation of melt and liquids salts, depending on the temperature and chemical composition of fuels. The main discrepancies observed. between the experimental and simulated data were due to particularities of the combustion process, which are not incorporated in the software, namely, kinetic limitations of the reactions, possible occurrence of secondary reactions in the ashes, and elutriation effects of ash and silica sand particles.
DOI http://dx.doi.org/10.1021/ef4018114
ISBN
Publisher
Book Title
ISSN 0887-0624
EISSN 1520-5029
Conference Name
Bibtex ID ISI:000330018200078
Observations
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