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1、Dev.Chem.Eng.MineralProcess.I3(3/4),pp.467-482,2005.MechanismsofSubmicronandResidualAshParticleFormationduringPulverisedCoalCombustion:AComprehensiveReviewD.Yu,M.H.Xu*,X.Liu,J.HuangandG.LiStateKeyLaboratoryofCoalCombustion,HuazhongUniversityofScienceandTechnology,Wuhan43
2、0074,P.R.ChinaCoaljlyashhasbeenatraditionalconcernofutilitiessincecoalwasusedtogenerateelectricitybecauseitmaybringaboutanumberoftechnicalandeconomicproblemssuchasslagging,fouling,corrosion,erosion,wastedisposalandoverallboilereficiencyreduction.Moreover,fineparticulates
3、thatescapethecombustionsystemarerecognizedtohaveanegativeimpactonhealthandtheenvironmentduetotheenrichmentofthetoxictraceelementsandbeingreadilyinhaled.Thisworkgivesabriefreviewofthestudiescarriedoutinthepastdecadesandtriestoelucidatethoseprocessesthatcontributetoashform
4、ation.Theyincludethemechanismsthatcontrolsubmicronashformationandthosethatarerelatedtoresidualashformation.Themechanismofvaporizationandcondensationisbelievedtobethemajorsourceofsubmicronashparticlesandisdiscussedindetailinthisreview.Residualashformationistheconsequenceo
5、fthecompetitionbetweenashcoalescenceandcharfiagmentation.Moreover,fiagmentationofexcludedmineralsandrotationallyinducedsheddingmayalsocontributetotheresidualashformation.Ourliteraturereviewhasprovidedanumberofexperimentalandtheoreticalresultsdescribinghowthesubmicronasha
6、ndresidualashareformed,Finallywepresentsomerecommendationsforpossiblefutureresearchtopics,includingsamplingtechniques,measurementtechniques,experimentalstudiesandmodellingefforts.IntroductionConsumptionofcoalisoneofthemajorsourcesformeetingworldenergyneeds,andtheimportan
7、tpositionofcoalasapowersourcewillnotchangeinthenearfuture.Combustionofpulverizedcoalstogenerateelectricityproducesalargenumberofashparticlesthatmaybringaboutbothoperationalandenvironmentalproblems.*Authorforcorrespondence(mhxu@mail.hust.edu.cn).467D.Yu,M.H.Xu,XLiu,J.Huan
8、gandG.Li1.Thebehaviorofmineralmatterduringpulverizedcoalcombustionhasbeenatraditionalconcernofutilities
