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1、AppliedMechanicsandMaterialsVols.295-298(2013)pp3110-3113Onlineavailablesince2013/Feb/13atwww.scientific.net©(2013)TransTechPublications,Switzerlanddoi:10.4028/www.scientific.net/AMM.295-298.3110Aninvestigationofthestructureandgasificationreactivityofchar1,a2,b1,c1
2、,dPeiWang,WenjianZhu,YonghuiBai,FanLi1KeyLaboratoryofCoalScienceandTechnology,TaiyuanUniversityofTechnology,MinistryofEducationofChinaandShanxiProvince,Taiyuan030024,P.R.China2XinjiangKinghoGroupofChinaKinghoEnergyGroup,Yining835100,P.R.Chinaabcahbbwangpei@126.com,
3、15276385566@126.com,yongfengbai@163.com,dlifan66@hotmail.comKeyword:Pyrolysistemperature;Mixturegasifyingagent;Gasificationreactivity;SynergisticeffectAbstract.TheYiningcharsampleswerepreparedinfollowingconditionsthatrawcoalparticleooosizewasinrange5-6mmandpyrolysi
4、sfinaltemperaturewas900C,1000Cand1100C,orespectively,withaheatingrate20C/minunderatmosphericpressure.Thegasificationreactivityofocharswasperformedbythermogravimetricanalysis(TGA)at900Cinsteam,CO2andsteam/CO2mixture,respectively.Theresultsshowthatthegasificationreac
5、tivityofcharsdecreaseswiththeincreasingofpyrolysisfinaltemperaturesandthereissynergisticeffectbetweensteamandCO2duringco-gasificationthatinfluencesthecharreactivity.Thereasonmaybeexplainedbycharstructurechange,whichFTIRshowedthat–CH3and–O–CH3decreasedandevendisappe
6、aredandXRDanalysissuggestedthatthethicknessofmicrocrystallineLc,thevaluesofmicrocrystallinediameterLaandthearomaticofcharfabecamelargerwithincreasingpyrolysistemperature.IntroductionUnderstandingofmechanismsofchargasificationisveryimportantforimprovinggasificationef
7、ficiency.Therefore,manystudieshavebeenconductedintherolethatcharreactivityposedon[1]gasificationprocess.R.K.Sharmapointedoutthatthearomaticityofthecharincreasedandthecharlosthydrogenandoxygenasthepyrolysistemperatureincreased.Meanwhile,heattreatment[2]increasesstru
8、cturalorderintermsoflayerstackingandgasificationreactivityisloss.Muchprogresshadbeenmadeintherelationshipbetweencharstructureandgasificationreacti
