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1、FuelVol.77,No.9/10,pp.1067-1079,199801998ElsevierScienceLtd.AllrightsreservedPrintedinGreatBritainPII:SOOlS-2361(98)00003-90016.2361/98$19.00+0.00ELSEVIERMathematicalmodellingofabubblingfluidised-bedcoalgasifierandthesignificanceof‘netflow’Hong-mingYana9b,Cra
2、igHeidenreichaybandDong-keZhangagbf*aDepartmentofChemicalEngineering,TheUniversityofAdelaide,Adelaide,SA5005,AustraliabCRCforNewTechnologiesforPowerGenerationfromLow-RankCoal,ThebartonResearchLaboratory,35-37StirlingStreet,Thebarton,SA5031,Australia(Received2
3、0November1996;revised24September19971Anisothermalmodel,incorporatingthetwo-phasetheory,hasbeendevelopedtoevaluatetheperformanceofabubblingfluidised-bedcoalgasifier.Adistinctivefeatureofthismodelistheconsiderationofanetflowtermfromtheemulsionphasetothebubbleph
4、aseintheconservationequations.Simulationswithconsiderationofthenetflowtermindicatethattheoverallresultscomparefavourablywithavailableexperimentaldatafromanindustrialfluidised-bedgasifierreportedintheliterature.Thenetflowissignificant,intherange71-87%relativet
5、othefeedgasrate,stronglydependingonthecoalrank,heterogeneousreactionratesandvolatilematterreleasedinthebed.Thehigherthecoalrank,thelowerthenetflowandtotalexcessgasflow.Thelargevolumeofnetflowgeneratedcansignificantlychangethefluidisationconditionsinthebedandt
6、husalterthereactionratesandmasstransferproperties.Simulationswithoutthenetflowdeviatesignificantlyfromtheexperimentalresults.01998ElsevierScienceLtd.Allrightsreserved(Keywords:coalgasification;fluid&dbed;mathematicalmode&g;netflow)INTRODUCTIONfluidisedbedcons
7、istsoftwophases:abubblephaseandanemulsionphase.Theemulsionphase,containingalltheTheintegratedgasificationcombinedcycle(IGCC)processparticlesandafractionofthegas,iscontinuousandissaidusingfluidisedbedsisanattractivetechnologyfortoremainatincipientfluidisationc
8、onditions.Allthegasingeneratingpowerfromlow-rankcoal’.Thetraditionaltheso-calledexcessgasflow(us-u,,J,inexcessofwhatisapproachtocommercial-scalefluidised-bedcoalprocessingrequiredtomainta
