Flue gasdesulfurizationbymeansoflimestoneinjectionundersimulatedfluidizedbedoxyfiringcondi- tions wasinvestigated,withaparticularfocusonparticleattritionandfragmentationphenomena.An experimental protocolwasapplied,basedontheuseofcomplementarytechniquesthathadbeenprevi- ously developedforthecharacterizationofattritionofsorbentsinair-blownatmosphericfluidizedbed combustors. Theextentandpatternoflimestoneattritionbysurfacewearinthedensephaseofaflu- idized bedwereassessedinbenchscalefluidizedbedexperimentsundersimulatedoxyfiringconditions. Sorbent samplesgeneratedduringtheoxyfiringtestswerefurthercharacterizedfromthestandpoint of fragmentationuponhighvelocityimpactbymeansofaparticleimpactor.Theexperimentalresults were comparedwiththosepreviouslyobtainedwiththesamelimestoneunderair-blownatmospheric fluidized bedcombustionconditions.Theprofounddifferencesintheattritionandfragmentationextents and patternsassociatedwithoxyfiringascomparedtoair-blownatmosphericcombustionandtherole played bythedifferentattrition/fragmentationpathswerehighlighted.Inparticular,itwasnotedthat attrition couldeffectivelyenhanceparticlesulfationunderoxyfiringconditionsbycontinuouslydisclosing unconverted calciumtothesulfur-bearingatmosphere.
Flue gas desulfurization under simulated oxyfiring fluidized bed combustion conditions: The influence of limestone attrition and fragmentation
Scala F;Salatino P
2010
Abstract
Flue gasdesulfurizationbymeansoflimestoneinjectionundersimulatedfluidizedbedoxyfiringcondi- tions wasinvestigated,withaparticularfocusonparticleattritionandfragmentationphenomena.An experimental protocolwasapplied,basedontheuseofcomplementarytechniquesthathadbeenprevi- ously developedforthecharacterizationofattritionofsorbentsinair-blownatmosphericfluidizedbed combustors. Theextentandpatternoflimestoneattritionbysurfacewearinthedensephaseofaflu- idized bedwereassessedinbenchscalefluidizedbedexperimentsundersimulatedoxyfiringconditions. Sorbent samplesgeneratedduringtheoxyfiringtestswerefurthercharacterizedfromthestandpoint of fragmentationuponhighvelocityimpactbymeansofaparticleimpactor.Theexperimentalresults were comparedwiththosepreviouslyobtainedwiththesamelimestoneunderair-blownatmospheric fluidized bedcombustionconditions.Theprofounddifferencesintheattritionandfragmentationextents and patternsassociatedwithoxyfiringascomparedtoair-blownatmosphericcombustionandtherole played bythedifferentattrition/fragmentationpathswerehighlighted.Inparticular,itwasnotedthat attrition couldeffectivelyenhanceparticlesulfationunderoxyfiringconditionsbycontinuouslydisclosing unconverted calciumtothesulfur-bearingatmosphere.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
