选择性非催化还原烟气脱硝技术(SNCR)在循环流化床锅炉上的工程应用

上海交通大学硕士学位论文选择性非催化还原烟气脱硝技术（SNCR）在循环流化床锅炉上的工程应用姓名：罗朝晖申请学位级别：硕士专业：动力工程指导教师：罗朝晖;蔡世林20071001ISNCRSNCRSNCRABSTRACTIIRESEARCHONENGINEERINGAPPLICATIONOFSNCRTECHNOLOGYFORCFBBOILERSABSTRACTThisthesisisbasedontheauthor’sexperienceonCFBboilerengineeringwork.ThroughtheanalysisontheSNCRtechnical’sengineeringapplicationonCFBboilertheauthordiscussedthedesignpricinpleofengineeringdesignandequipmentsselection.Authormakegooduseofcombinationofcalculationformula,modeltheorywithengineeringdesigndata,projectexperienceandrelevantchart,datasheet.TheauthorcomparedsomedifferenttypeSNCRsystemsadoptedinprojectwitheachothertofindouttheiradvantageanddisadvantage.TheemphasisofthethesisistheresearchonthedesignoftheaqueousammoniaSNCRsystemusedonCFBboiler.Theauthoranalyzedthekeypointofengineeringandequipmentselectionandmodelingmethodsandsteps.Viaboththetheoryandengineeringexperiencestudy,wecangettheconclusionthattheSNCRsystemadoptedonCFBboilerwithcompactseparatoriscapacitytoachievehighefficientNOxremoval.Keywords:Fluidization,CFB,compactseparator,SNCR,FluegasDeNOx,AmmoniaInjectionSystem,EngineeringDesign11.1.PH4[1]1.2.1.2.1.SCRSCRSNCR1970219201921FritzWinklerWinklerWinklerwinklerWarrenLewisEdwinGilliland19381960DouglasElliotKarhulaHans196919701970197619791CFB1.2.2.3116~40mm85%~90%4~8m/s100µm~6mm97~99%6m/s20~80µm99%CFB1.2.3.BFBBFB4BFB1.2~2.5m/s1~1.5BFBBFB5~6mmBFB30%~60%40%~70%BFBCFBBFBBFB1.2.4.54.0~5.5m/s60100%1~21.2.5.50197911980100MWCFB1990250MWCFB2000400~600MWCFBFosterWheelerEnergiaOyLagisza1460MW(CFB)1.56Alstom300MW200~300MW22200~300MWABB-CE/JEA2300MWFWPKE460MW1.2.6.FWCFB60FW2000600MW2004ENDESA800MW[2]CFBCFBFWCFBCFBCFBCFB7FW37~43m10.05520405585125180235300460255055105135140205280375050100150200250300350400450500PilotplantPihlavaKauttuaLeykamTri-StateKajaaniSeinajokiNovaScotiaTurowJEALagisza19761979198119871987198919901993199820012007MWe1CFBFig.1DevelopmentofCFBUnitCapacityw,d,w=kdA=(2w+2d)*H=2(1+k)d;V=w*d*H=kd2;A/V=2(1+k)d/kd2=2(1+k)/kddwkA/V=*(1+k)/k=*(1/k+1)A/V(1/k+1)kA/VINTREXTMCFB8CFB100~150MW9~11CFB8[3]1402502803002826231305010015020025030035020MW40MW235MW300MW2CFBFig.2GridPlanArea/FuelFeedPoint9210(0.93m2)[4]1.2.7.CFB3FosterWheelerCFBFig.3SideViewofFosterWheelerCFBwithCompactSeparator2006FosterWheelerCFB30450%26044300MW10460MW3FWCFB304CFB2175928FosterWheelerCFB44Fig.OperationYearofdifferenttypeofSeparator5Fig.5DevelopmentofFirstandSecondGenerationSeparatorDesign5111.3.1.3.1.9~1412850~90098%~99.5%99.5%1.3.2.90~95%SO20.15~0.3mm906C0.98BarSO2=3000PPM0.0%10.0%20.0%30.0%40.0%50.0%60.0%10-2060-706Fig.6SulfationRateasFunctionofLimestoneSizeandDegreeofLimeUtilization20%SO2CaSO4SO21361.590~92%1.4~2.780~95%1.3.3.100%35%4~7%MCR9~15100%MCR35%MCR100~50%MCRNOx141.3.4.NOxNOx[5]fuelthermalPromptNOxNOxNOxCONOxNOxNOxSCRNOxNOxN2NOxSO22%NOxNOxNOxSNCR29%25%19%SNCR15FWSNCRNOx1.5~3.0NH3/NOx70%~80%SNCR1.4.CFB1980300MW600MW1000MW1300MW1954195619611968300MWCFB2002JEACFB300MWAlstom200640200400600800100012001400191019201930194019501960197019801990200020102020MWFWUSA7CFBFig.7ComparisionbetweenUnitCapacityofPCBoilerandCFBBoiler7CFBCFB60~701000MWCFB16CFBCFBCFBCFBCFB1995220t/hPryflowCFB[6]1.4.1.1300~140099.5%CFB97.5~99.5%CFBCFBCFB30~35%MCR60%MCRCFBCFB220t/hCFB18~25t1%[3]CFB1730%MCRCFBCFB1.4.2.SO2CFBSO2CFBSO2SO2NOxCFBNOxNOxSCRCFBSNCRCOCO33[7]SO2t/MW.aNOxt/MW.at/MW.at/MW.aCO2t/MW.a12~243.7~1012000.3~0.9670022020200186000207.5-0.761000.027.5--36001.4.3.CFB/CFBFW/CFBCFBCFB18100MCRCFB1.5.1.5.1.SCRSNCRSCRSNCRSNCR30%~60%NOxSNCR80SNCR400SCRSNCR7030FuelTechSCR/SNCRSCRSNCRSNCRFWCFBSNCRSCRSNCRCFBSNCR19NOxSNCR1.5.2.FWCFBNOxCFBFWCFBSNCRNOxNOxNOxNOxCFBNOxCFBSNCRCFBNOxNOxSCRSNCRSNCRHanwhaSNCRSNCRSNCRSNCR201.6.SNCRNOxSCRSNCRSNCR212.1.199830[8][9][10]1NO2NO2+NO+O2OHcO3HcO2H3O23NONO2O3Hc+OHcO3*HcO3*+NOHcO2*+NO2HcO3*+HcHcO3*+O2O3*+H3O2*HcOX*+NO2*NONO2NOx110-71000h[11]222.2.2.2.1.NOxNOxfuelthermalPromptNOxNOxN2+O22NONO+0.5O2NO2Kp=PNO2/(PO2.PN2)Kp’=PNO2/(PO20.5.PNO)44KKpKp’300110-30110610007.510-91.110-115001.110-51.110-220004.410-43.510-3NONO2NOxNOxNOxZeldovichpromptNOxNO90NO2NOxNOZeldovichNOx1800~2000Zeldvich1964NON2+ONO+N23N+O2NO+ON+OHNO+H[12]W=8.391061.5T-0.5YN2YO20.5exp-564.4103/RTNOdNOdt=kN2O20.5=31014O20.5N2exp(-542000/RT),RJ/(mol.K)kO2NOxNOx1500NOx100NO5C-NNOxNOxEPA/452/B-02-001SECTION4.2NOxNOxNOxNOxNOxNOxDeSoete[14]3(d)HCNNO(e)NOHCN(f)NO5(K=Bexp(-E/RT)CH+O2+H+HN2HCNNCONHNN2+H+C+H+OCHNO245NOxBE(J/mol)d11011/(1/S)2.803105e31012/(1/S)2.5105105f4.1810-4/(kmol(N.s)-1)1.425105NOx66[5]%%0.05~0.4-0.4~2.90.2~0.41.3~3.0C0.18~0.210.6~0.8A0.013~0.0150.43~0.580.012~0.0130.4~1.20.00010.4HCNNHiNON2NOx2.2.2.NOxNOxNOX[13]NOxNOxNOx2.2.3.NOxNOxNOxNOxNOx25NOxCFBNOxCFBNOxNOx77NOxmg/Nm3-48011001000400500700800W-47070010001500100MW50.6%[15]NOx500mg/Nm3NOxNOxNOxNOxNOx95%1300NOx400~600ppm800~900NOx10%NOxNOxNOxNOx150~200ppm2.2.4.NOxNONONONO2NO226NOxNONO2N2NH3SCRSNCR2.2.5.70SCRSNCR88NOx70%NO10%150~20010%NO1/3~1/2/NOx/NOxNOxNOx/SCR80%95%SCRNH3SNCR50%NH380%60%~90%COFAZ80%300SOxNOx272.3.2.3.1.3500040000kJ/m3[16]NOxNOx87mg/m3[7]6B9E2005~2006HRSGSCRNOxNOXN215%NOx20.5mg/m3NOxHRSGHRSGHRSG2.3.2.SCRSNCRSNC