燃烧过程中煤粒孔隙结构变化及对颗粒物的影响

华中科技大学硕士学位论文燃烧过程中煤粒孔隙结构变化及对颗粒物的影响姓名：李庚申请学位级别：硕士专业：热能工程指导教师：徐明厚;WuHongwei20050401IV,68%LPISEMPM10VAbstractAtpresent,theenvironmentpollutionduetoinhalableparticlesisthemainpollutionstotheatmosphere,amongthecitiesthatexceedstandardoftheairquality,68percentsofthemexistingtheproblemsofinhalableparticlespollution,ithasimportantinfluenceonthelivingqualitiesofthehumanbeings.Itisindicatedinresearches:inhalableparticlesintheatmospherehaveseriouslydestroyedthehuman’shealthandecologicalenvironment.Coalcombustionisthemainemissionsourceforinhalableparticles.Therearemanyfactorsinaffectingtheformingofinhalableparticles,thefragmentationsofthecoalparticlesisone.Thefragmentationhasagreatinfluenceontheburnouttime,particlessizedistribution,boilerresidueandattrition.Therefore,intensifyingthemechanismresearchofcoalfragmentationanditseffectontheformingofparticleshasimportantscienceandpracticemeaning.Inthisthesis,theporousstructureevolvementanditsinfluenceontheashparticlescharacteristicduringcoalcombustionispreliminarilystudiesbytheorysimulationandexperimentstudy.Aboveallthethesissummarizestheoverviewofthecoalfragmentation,andresearchessomemainkindsofmodelsdescribingtheporestructure.Onthebasisofthefrontwork,thecriticalfragmentationporosityismodeledusingthepercolationtheory,theresultsiscomparedwiththeliteratureexperiment;theinfectionofvariedfactorsonthechangeoftheporestructurearecalculated,suchasthetemperature,thecoalparticlesize,thefragmentationplaceandthethermalconductivityetc.Inthenextplace,weexperimentseparatelyintheDropTubeFurnacesandthenewone.Thepreliminaryexperimentsmainlyaimattheaffectionoftemperatureandatmosphereonthemicrogranulescreation,preparingforthenextexperiments.TheninthenewDTF,withtheconditionchangedincludingtemperature,atmosphere,coalparticlessize,analyzedashparticlesbyLPIandcharbySEMaftersampled,theexperimentssummarizetheporestructureevolvementinchar,ashgranulessizedistributionandtheinhalableparticlesemissionamountunderdifferentconditions.ItisobtainedthattheinfluenceofthecombustionconditionsonthecharporestructurechangesandtheinhalableVIparticlescreationcharacteristic,establishingthefoundationforcontrollingtheemissionoftheinhalableparticleseffectively.Keywords:inhalableparticlesporestructurefragmentationIII√111.1730045.740353525507025030020108423.952050404.285.337.752.512.567.65200014204/52198620200035507085%2010451.2PMparticlematterTSP100µmPM1010µm13µm1µm[1]1-131-1µmµmTSP70primaryparticlesXNO3NHsecondparticlesAsSePbCrPAHs1.3PM10150µg/m324h1997PM2.565µg/m3[2,3]4XNO3NH2SOXNO1µm20401µmµm1µm1-2[4]1-25[5][6][7],,[8][9]KerstainNiksa[10]0.7HurtDudekWeiss[11,12,13][14,15,16]61.4()SEM1.2.73.4.SEM5.821-100µm0.01-1µm2.12.1.1[23]9ASTMAmericanSocietyforTestingandMaterials1.92SiOFeOCaOMgO2()()()2()SgSgSiOCOSiOCO++()()()2()SgSgFeOCOFeCO++()()()2()SgSgCaOCOCaCO++()()()2()SgSgMgOCOMgCO++2()()()()SSSgSiOCSiOCO++[24]12001[23,25][26,27]0.01µm3[26,28,29]FeMg10[30]XNO[31]2SiO232222AlOSiOHOii50µm0.1-5µm25-200µm2-5µm[24]13001400323232FeCSiOFeSiFeCO+++1400CO112.1.21200-14002FeS3CaCO3FeCO33CaCOFeCOi2.2,30nm[19][20]XNO12[18]KerstainNiksa[10][21]SEM47570.1µm72822.2.1350-400[32]ChironeMassimilla[33]DwiwahjuSasongko[34]Chirone132-12-2[34]2-12-1142-22-22107Pa[35,36]900[15]15fNdFfS/foutinNNN=outNinN1/ndiiaiFXdd==∑iXiididF/ffdSNF=fSfSfSτ6s6s6sfS[33,37]fS[35]100900别讨论了应度2.2.216[38]KersteinNiksa[39]0.72.15()~fmm−3.86()~grr−[40][40]1300%%172.32030%,,2.3.12.3.1.130nm1.2nm[41][42][43]18[44]2-12-12.3.1.2[45][46]19[44]30LLγ⎛⎞=⎜⎟⎝⎠L,0,022micmicmicNmicmicmicLRPLRPγγ⎛⎞+=⎜⎟⎜⎟+⎝⎠,0micNmicNNγ=micLmicRmicPmicNγ,0micmicdVdVγ=0PdVdVγ=γPγmicVV20[11][12][46,48](),011LLPγεεγ=−−Lε2.3.2[41,48,49]µm2.3.2.1[11,12,13][47]2-22-32-2212-32-2Lε2-3[39][48]µm222-42-4[40]12006390µm40%[49]CaO234840401431%4870%10%[50]2.3.2.2,0Lε[53]R()()()(),01111LLdXRRXRεε−=−−−2-524XdRX2-5[48]2.42325263,3.13.1.130nm1.2nm95%[54][47]KerstainNiksa[10]0.7HurtDudekWeiss[11,12,13][14,15,16]3.1.227p1-pppppcpcppc3-1P=1P01PcPc3-13.2VC3-2283-2KerstainNiksa[10]3-13-1KerstainNiksa0.50.85800K140293.3KantorovichBar-Ziv[44]3-33-33.3.1Hurt[11]0dd=λ()031V∗−λXXVC∗0()[]0303000TTTCPTPVVVXVVVV∗∗−−∗+==λλθ(3-1)()0003CLSCLSVVVVVV++=++λ30()[]00330011SSXθθλλθθθ+−−+∗−+=(3-2)PVTVCV03-4(),011LLPγεεγ=−−[7]3-4[44]3.3.231,22(,)(,)dTrtTrtcrdtrrrλρ∂∂⎛⎞=⎜⎟∂∂⎝⎠(3-3)0t=0(,0)TrT=0r=0dTdrλ=drr=(,)((,))beddTrthTTrtrλ∂=−∂bedTλ0.20.81.42100µm12003.53-500.51x10-3250300350400450500550t=0.2,0.8,1.4,2(s)Distancex(m)TemperatureT(K)00.511.52250300350400450500550r=0.00025,0.0005,0.00075,0.001(m)Timet(s)TemperatureT(K)3-5PLθ0Lθ[51])1()(1)(11)(LOdLRXRXRθθ−−−−=(3-4)32()(1)gERTRWdXkXedtδα−=−(3-5)345)1(1])(1[011)1(1)(2δθθ−−−⎟⎟⎟⎠⎞⎜⎜⎜⎝⎛−−×−−=GGeRdRRwLL(3-6)δωδθθθθ−−⎟⎟⎠⎞⎜⎜⎝⎛−−−⎟⎟⎠⎞⎜⎜⎝⎛−−−=101011111LLCLLCeG(3-7)λλω2)]([])([20gdgdRTRTRTE−=(3-8)LθWkαδ0.980.757Egλ031*10−m12000.43-63-633[48]EDCX3.3.33-345680012003-73-7343.3.4[53]3-8678/gλλ0.10.0512003-83.3.580µm200µm1200350.43-980µm200µm3-93.4136VC0.5-0.850.72matlab374PM104.1SEM4.1.10.2gSEM0.1g4.13880µm80140µm140µm150cm2.5cmKOH4.1.24.1(%)(%)CHONS76.853.7482.2021.3700.5700.7414.4914.5270.253980µm80140