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ID:36436073
大小:6.05 MB
页数:98页
时间:2019-05-10
《利用声波团聚增强燃烧源可吸入颗粒物脱除的研究》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、东南大学博士学位论文利用声波团聚增强燃烧源可吸入颗粒物脱除的研究姓名:赵兵申请学位级别:博士专业:热能工程指导教师:沈湘林20080430AbstractAsoneoftheprimarypollutants,InhalableparticlesPM2.5orfineparticlesmainlyfromcoal-firedpowerplantsanddieselcombustionhavegreatlythreatenedhumanhealthandtheecologicalenvironment.Theconventionaldevic
2、es,suchasESP(ElectrostaticPrecipitators)andCyclonecannotremovethefineparticlesefficientlybecauseoftheirverysmallsizes.嬲theresult,therearestillagreatnumberoffineparticlesflowingintotheatmosphere.Uptonow,thereisnoalleffectivetechnologytoremovefineparticlesandthepretreatmentp
3、roceSSofacousticagglomerationisapotentialmethod.Bysubjectedtotheintensesound,thefineparticlesCanagglomeratetogetherandevolvetobigones,SOitiseasytoremovetheselargeparticlesbyEPSorCyclone.Inthispaper,researchonacousticagglomerationhasbeendonefromthetwoaspects:microaero—dynam
4、icalbehaviorsoffineparticlesinanacousticwavefieldandmacroefficienciesoffilterstoremovefineparticlesbymeansofacousticagglomeration.AnexperimentaldevicetostudythedynamicalbehaviorsoffineparticlesWassetupbymeansofavisualizationtechnology.Trajectoriesandshapesoffineparticlesin
5、ahorizontalacousticfieldwerevisualizedandpictured,whichWasusedtoinvestigatethemotionbehaviorsoffreeparticles谢tllandwithouttheexcitationofanacousticwave.atthedifferentpositionsintheacousticfield.Resultsshowedthatfineparticlesvibratedatthesamefrequencyasthatoftheacousticwave
6、anddriftedtowardsthenodes镐well船gravitationalsediment.Incomparisonwithonlythesedimentofparticles,theoscillationgreatlyincreasedtheareacoveredbythetraceoftheparticles,whichcouldbebeneficialtotheparticleagglomeration.Furthermore,thecomparisonofentrainmentbehaviorsbetweenindiv
7、idualparticlesandaggregateshasbeenstudiedexperimentallyandtheoreticallybaSedonthetheoryofacousticentrainmentandfractal.ItWasfoundthatbiggeraggregatesandthecounterpartsofsmallerindividualparticleshavesimilardynamicbehaviors.Theresultsalsoshowedthatfineparticlesdriftedtothev
8、elocitynodenotbytheradiationforcebutbythedriftforce.Thedriftingbehaviorsacceleratetheaggl
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