燃煤电厂SCR烟气脱硝装置的冷模实验和CFD数值计算研究

上海交通大学硕士学位论文燃煤电厂SCR烟气脱硝装置的冷模实验和CFD数值计算研究姓名：朱文斌申请学位级别：硕士专业：动力工程指导教师：吴国江;何安定20081101-IV-SCRCFDSOXNOXCO2“”2005SCRSCR90%NOXSCRNOX60%SCRFMTCFD-V-SCRSCR1/12CFDCFDSCRSCRCFDSCRSCRFMTCFDABSTRACT-VI-FLOWMODELTESTANDCFDNUMERICALCALCULATIONSTUDYFORFLUEGASSCRREACTOROFCOAL-FIREDPOWERPLANTABSTRACTNowadays,Chinastilldependsoncoalasthemainpreliminaryenergy,thegasproducedbycombustionofthecoalcontainsmuchcontamination,suchas:dust,SOX,NOXandCO2,etc...Thecontaminationejectsdirectlyintotheatmosphere,andhasbroughtseriousenvironmentproblem.Thisistheimportantproblemforoureconomysustainabledevelopmentandweneedtosolveiturgently.Savingenergyandreducingemissionareourkeytasksduring‘theEleventhfive-year’andwillkeepforalongtimeafter.Since2005,theDeSOXmarkethasbeencomingintoanindexincreasingperiodforcoal-firedpowerplant,alotofnewly-builtandretrofitpowerplantsneedtoinstallSCR(SelectiveCatalyticReduction)reactor.ABSTRACT-VII-SCRisthewidelyadoptedtechnologyforfluegasDeNOX,sharingapprox.90%ofthewholemarket.ThispaperparticularlyintroducestheactualityofNOXemissionandcontrolbothforhomeandothercountries,andalsointroducesthebasicapplicationprincipleofSCRtechnology.Atpresent,ourcoal-firedpowerplants’NOXemissionaccountformorethan60%ofthetotalemissionofthecountry,soitbecomesverycriticaltoreducetheemissionfromcoal-firedpowerplants.Inrealprojectsapplication,thefluegasvelocityandtheammoniaconcentrationdistributionattheinletofthefirstcatalystlayerinSCRreactorimpacttheoperationefficiencyofthewholesystem.Usuallyduringtheprocessdesign,FMT(FlowModelTest)andCFD(ComputationalFluidDynamics)shouldbestudiedandcalculated,soastoguaranteethefluegasvelocityandtheammoniaconcentrationdistributionattheentranceofthefirstlayerofcatalystinSCRreactor.Butnow,thiskindofresearchismainlyprovidedbyoverseassuppliers,whichcostsmuch,anditalsodoesnotavailforustomasterthekeycoresofSCRDeNOxsystem.ForSongYuSCRreactor,webuilta1/12scalephysicalmodel,andcompletedthetestunderthecoolcondition.Atthesametime,westudiedtheCFDcalculation,throughvariousschemescalculationandanalysiswegotthefinaloptimizationdesign.TheconclusionsbetweenCFDcalculationandFMTmatchverywell,providingthetheoryevidenceandtheABSTRACT-VIII-possiblesolutionsforthefinaloptimizationdesign,thusensurethemaximumoperatingefficiencyoftheSCRwhileminimizingthepressurelossesandpreventingdustaccumulation.AlotofSCRreactorsarejustundererection,butrelativedesignstandardsarestillshort.Certainly,itshowsagreatimportancetoestablishaseriesofregulationsforCFDandFMTstudiesofSCRreactor.Finally,thispapersummarizessomeessentialpointsinthestructureoptimizationdesignforSCRDeNOxReactor.RegardingtosomeissuesexistingintheFMTandCFDsimulatingforSCRreactor,thispaperpresentssomekeypointsbasedontheexample.KEYWORDS:NOxSCRflowmodeltestCFDcoal-firedpowerplantoptimization-XIII-1NOx...........................................22NOx.....................................63SCR.................................114SCR................................125SCR...........................................146SCR...............................................157SCR.......................................................168SCR...................................179AIG.................................................1810.......................................................1911SCR.....................................2112SCR...........................2413SCR...................2514SCR.................2615...................................................2916SCR.............................3017...............................................3118.....................................................3119.................................................3220...............................................3221SCR...................4122...................................................4223...................................45-XIV-24CFD...........................................4625...........................4626CFD.......................4727SCRCFD...............................4728.......................4829.....................50303SCRCFD.................................52314SCRCFD.................................53325SCRCFD.................................5333AIG........................5434.......................................5535().............................................5536.......................5637CFD...................5738SCRCFD...........................5739SCRCFD.....................5840.........................58-XV-1SCR..................................222SCR....................................223..........................................434......................................435..........................................446........................................487CFD............................518........................................59-IX-Am2dmEJFrgm/s2hJ/KglmLmpPaqJ/(s•m2)Qm3/sQJ/sReSrTKtsβ%τPaum/sxvm/sywm/szVm/sυm2/sλεm2/s3ηKm2/s2µKg/(m•s)ρKg/m3фΓS20081112□□“√”2008111220081112-1-(NOx)NONO2N2ON2O3N2O4N2O5[7]20077132914.36%5544277.73%2007100098158.35(FlueGasDeNOx)90%SCR15