柴油机尾气颗粒物净化理论及方法研究

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1、20184ResearchonTheoryandMethodofPurificationofDieselExhaustParticulatesADissertationSubmittedfortheDegreeofMasterCandidateGongRuiqingSupervisorProf.XieXiaopengSouthChinaUniversityofTechnologyGuangzhou,ChinaTK421+.51056120162010093820184122018531--FluentCFDCFDIAbstra

2、ctInrecentyears,manycitiesinChinahavebeenshroudedinhaze.Environmentalproblemshavebecomeincreasinglyserious.Andpeople'sattentiontoenvironmentalgovernancemethodshasalsobeenincreasing.Asoneofthevehiclesthatpeopleusefordailytravelandtransportation,dieselvehiclesarewidel

3、yusedindailylife.However,exhaustparticulateindieselvehicleemissionsisoneofthemajorsourcesofhaze,causingsignificantdamagetothehumanbodyandtheenvironment.Inordertoeffectivelyreducetheemissionsofdieselexhaustparticulates,thispaperstartsfromthepointofviewofreducingtheem

4、issionofsolidparticlesindieselexhaustgas.Thetheoreticalanalysis,numericalsimulationandexperimentalverificationareusedtostudythepurificationofdieselparticulates.Themainresearchcontentsofthisarticleareasfollows:Firstly,themicroscopicappearanceofdieselexhaustparticulat

5、esisobservedbyopticalmicroscopeandscanningelectronmicroscope,respectively.Themicroscopicmorphologyandparticlesizerangeofdieselexhaustparticulatesaredetermined.Itlaysthefoundationforthestudyoftheseparationofparticulatematterfromgasesintheexhaustgasandtheestablishment

6、ofmathematicalmodels.Second,thegas-solidtwo-phaseflowtheoryisintroduced.Thegasphaseisconsideredasacontinuousmediumandthesolidphaseisconsideredasdiscreteparticles.Aspiralseparationmodelandaparticle-dropletseparationmodelareestablished.Theanalysisofthemovementofthepar

7、ticlesintheexhaustgasinthespiraltubeandthemovementoftheparticlesaftertheiradsorptionbythedropletsareperformed.Theoptimizationeffectsofspiralseparationmethodanddropletadsorptionmethodontheseparationefficiencyofgas-solidtwo-phaseflowinexhaustgasarestudied.Again,basedo

8、nthespiralseparationtheorymodelandtheparticle-dropletseparationmodel,adesignideaforanewtypeofdieselexhaustgaspurificationdeviceisproposed.