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Ash agglomeration and deposition during combustion of poultry litter in a bubbling fluidized-bed combustor

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Show simple item record Lynch, Deirdre Henihan, Anne Marie Kwapinski, Witold Zhang, Lian Leahy, James J. 2013-10-23T13:57:34Z 2013-10-23T13:57:34Z 2013
dc.identifier.citation LYNCH, D., HENIHAN, A. M., KWAPINSKI, W., ZHANG, L. & LEAHY, J. J. 2013. Ash Agglomeration and Deposition during Combustion of Poultry Litter in a Bubbling Fluidized-Bed Combustor. Energy & Fuels, 27, 4684-4694. en_US
dc.description peer-reviewed en_US
dc.description.abstract n this study, we have characterized the ash resulting from fluidized bed combustion of poultry litter as being dominated by a coarse fraction of crystalline ash composed of alkali-Ca-phosphates and a fine fraction of particulate K2SO4 and KCl. Bed agglomeration was found to be coating-induced with two distinct layers present. The inner layer (0.05–0.09 mm thick) was formed due to the reaction of gaseous potassium with the sand (SiO2) surface forming K-silicates with low melting points. Further chemical reaction on the surface of the bed material strengthened the coating forming a molten glassy phase. The outer layer was composed of loosely bound, fine particulate ash originating from the char. Thermodynamic equilibrium calculations showed slag formation in the combustion zone is highly temperature-dependent, with slag formation predicted to increase from 1.8 kg at 600 °C to 7.35 kg at 1000 °C per hour of operation (5.21 kg of ash). Of this slag phase, SiO2 and K2O were the dominant phases, accounting for almost 95%, highlighting the role of K-silicates in initiating bed agglomeration. The remaining 5% was predicted to consist mainly of Al2O3, K2SO4, and Na2O. Deposition downstream in the low-temperature regions was found to occur mostly through the vaporization–condensation mechanism, with equilibrium decreasing significantly with decreasing temperatures. The dominant alkali chloride-containing gas predicted to form in the combustion zone was KCl, which corresponds with the high KCl content in the fine baghouse ash. en_US
dc.language.iso eng en_US
dc.publisher American Chemical Society en_US
dc.relation.ispartofseries Energy and Fuels;27(8), pp. 4684-4694
dc.rights Reprinted with permission from Energy and Fuels, 27(8), pp. 4684-4694 doi DOI: 10.1021/ef400744u. Copyright © AMERICAN CHEMICAL SOCIETY en_US
dc.subject poultry litter en_US
dc.subject fluidised bed combustion en_US
dc.subject ash en_US
dc.subject agglomeration en_US
dc.title Ash agglomeration and deposition during combustion of poultry litter in a bubbling fluidized-bed combustor en_US
dc.type info:eu-repo/semantics/article en_US
dc.type.supercollection all_ul_research en_US
dc.type.supercollection ul_published_reviewed en_US
dc.contributor.sponsor Department of Agriculture, Fisheries and Food en_US
dc.contributor.sponsor IRCSET en_US
dc.contributor.sponsor EUOSSIC program en_US
dc.relation.projectid RSF No. 07 559 en_US
dc.rights.accessrights info:eu-repo/semantics/openAccess en_US

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