流化床生物质气化动力学模型建立

:2007207206.,,(,071003):,,,,,(),,,:;;;:TK6:A:1007-2691(2008)01-0004-05StudyondynamicmodelingmethodofbiomassgasificationonfluidizedbedLIDa2zhong,WANGHong2mei,HANPu(SchoolofControlscienceandEngineering,NorthChinaElectricPowerUniversity,Baoding071003,China)Abstract:Therearetwomethodsinbiomassgasificationmodeling;oneisthermodynamicmodel,theotheriskineticmodelbasedonthechemicalreactionkinetics,withwhichthegasificationprocesscanbereallyreflectedandthefinalgascompositionscanalsobepredictedrelativelyaccurate,theseguaranteethatagroupofoptimalgasificationcondi2tions(temperature,gasificationagentratio,etc)couldbefoundtomakethebiomassgasificationprocesstendtoglobaloptimum.Sodrawingontheenlightenmentofkineticmodelingofcoalgasificationandtakingtheadvantagesofequilibriummodelandkineticmodel,thisarticlediscussesamethodofintegratedkineticmodelingincludingthreeparts:pyrolysis,gasification,andthesecondaryreactionmaybeexist.Keywords:fluidizedbed;biomassgasification;kineticmodel;methoddiscussion0,,,;,,,(),:(1),(2),(3),(cracking)(reforming)COCO2H2O(),,[1],[2],35120081JournalofNorthChinaElectricPowerUniversityVol135,No11Jan1,2008,,[3]:(1),,,(2),[4](3),(4)CO,CO2,H2,H2O,CH4H2S,H2S,;1,70%[1]David[5],,CO,CO2,H2,H2O,CH4H2S,Cdaf,Hdaf,Odaf,Ndaf,Sdaf[3]:(C)01750142860127270000(H)01250010111110010588(O)0015714017273001888900(N)0000010(S)000001019412010000000010000000010000charCH4COCO2H2H2ON2H2S=CdafHdafOdafNdafSdaf(H2)4Hdaf(CO)1175Odaf(CO2)11375Odaf:(H2)CH4;(CO),(CO2)CO,CO2OO;(C),(H),(O),(N),(S)C,H,O,N,S(H2),(CO)(CO2),(x),2,,[6,7],[8]1073T1273,p=1par,[9],,,,,,211,1:1Fig11Thethermaldecompositionmechanismofbiomass51,:,(),,dnidt=K(1-ni)m:dnidt=k0exp(-ERT)(1-ni)m(1):nii;k0;E;R(81314J/Kmol),[10]:M/min,(M):T=T0+Mt,:dt=1MdTdt(1)nidni(1-ni)m=1Mk0exp(-ERT)dT(2),Coats-Redfern,(2)In[1-T2ni0(1-ni)-mdni]=In(2k0R15E)-(ERT),,k0E,212,,[1],,12,21211,,Langmuir,21[2]Table11Kineticequationsofbubble-denseheterogeneousphasereaction(1)C+O2=CO2R1=-1WdWdt=k10k11pO21+k11pO2+k12pCO2(2)2C+O2=2COR2=-1WdWdt=k20k21pO21+k21pO2+k22pCO(3)C+CO2=2COR3=-1WdWdt=k30k31pCO21+k31pCO2+k32pCO(4)C+H2O=CO+H2R4=-1WdWdt=k40k41pH2O1+k41pH2O+k42pCO+k43pH2(5)C+2H2=CH4R5=-1WdWdt=k50k51pH21+k51pH2+k52pCH4:Rii;W,kg;kij(ii,jij),,,:Ri=f(pi1,pi2,pin,ki0,ki1,kik):Ri,pi1,pin,mkiRi,i=Ri-f(pi1,pi2,pin,ki0,ki1,kik):Q=mi=12iQ,62008:5Q5kij=0(j=0,1,2,k),,21212,22[2,3]Tab12Kineticequationsofbubblephasereaction(6)2C+O2=2CO2R6=-dCCOdt=k6Cn61COCn62O2(7)H2+12O2=H2OR7=-dCH2dt=k7Cn71H2Cn72O2(8)CO+H20\H2+CO2R8=k81CCOCH2O-k82CCO2CH2k82=k81/keq1(9)CO+H2\CH4+H2OR9=k9(PCH4-P3CH4)/(pas-1)P3CH4=keq2PCOP3H2/PH2O(8),(9)CH4,keq1,keq2(8)(9)CCO,CO2,CH2,CH2O,,mol/m3;kg=k0gexp(-Eg/RT)(gg,g=(6,7,8,9));ngq(q=1,2)g,kg,(6)(7),y=a+bx1+cx2+dx3,:Inrg=Inkg-ERT+ng1InCg1+ng2InCg2Inrg=y,1T=x1,InCg1=x2,InCg2=x3,(y,x1,x2,x3),(8)(9)213212,,,[3],:Ii=1miH0f,j,298+Ii=1miTr298CP,T,idT=Jj=1njH0f,j,298+Jj=1niTp298CP,T,jdT+Q:mi,nj,kg,i,j()i,(j);H0f,i,298,H0f,j,298,J/g;CP,T,i,CP,T,j,J/(gK),Q,,3,:(1);(2)(H2),(CO),(CO2)();(3)ER;(4)(),;,Runge2Kutta,,,,,,,471,:,,,,,,,,,,,,,,,[1],,,.[M].:,2005.[2].[M].:,1998.[3],,,.[J].,2004,38(10):1362-1365.[4]GOVINDR,SHAHJ.Modelingandsimulationofanentrainedflowcoalgasifier[J].AIChEJournal,1984,30(1):79-92.[5]DAVIDM.Mathematicalmodelsofthethermaldecom2positionofcoal[J].Fuel,1983,62:534-539.[6],,,.3[J].,2007,32(2):194-197.[7],,.[J].,2007,41(2):47-53.[8]CapucineDupont,GuillaumeBoissonnet,Jean-MarieSeiler.Studyaboutthekineticprocessofbiomasssteamgasification[J].Fuel,2007,86:32-40.[9]SamyS.Sadaka,GhalyAE,SabbahMA.Twophasebiomassair-steamgasificationmodelforfluidizedbedreactors:Part-modeldevelopment[J].BiomassandBioenergy,2002,22:439-462.[10],,,.[J].,2003,31(4):311-315.[11],,,.[J],2004,31(2):9-11.:(1962-),,(3),,,,,,,:[1],.-[J].,2003,23(6):2803-2809.[2],,.[J].,1997,18(1):51-58.[3],.[J].,2003,24(3):371-375.[4].Matlab[M].:,2005.[5]VanBaarsGE,BongersPMM.Flexiblewindturbinemodelvalidation[J].WindEngineering,1992,16(4):247-256.[6]MuljadiE,ButterfieldCP.Pitch-ControlVariable-SpeedWindTurbineGeneration,IEEETrans.onIn2dustryAppl.2001,37(1):323-330.:(1971-),,82008