Preliminary Research on the Effects of Coal Devolatilization and Char Combustion Processes on the Emission of Particulate Matter during Lignite Combustion under Air and Oxy-fuel Conditions(1)

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1、Articlepubs.acs.org/EFPreliminaryResearchontheEffectsofCoalDevolatilizationandCharCombustionProcessesontheEmissionofParticulateMatterduringLigniteCombustionunderAirandOxy-fuelConditions,†,‡†††††,†ChangWen,*BinFan,WenyuWang,XianpengZeng,GeYu,WeizhiLv,and

2、MinghouXu*†‡StateKeyLaboratoryofCoalCombustion,SchoolofEnergyandPowerEngineeringandDepartmentofNewEnergyScienceandEngineering,SchoolofEnergyandPowerEngineering,HuazhongUniversityofScienceandTechnology,1037LuoyuRoad,Wuhan,Hubei430074,People’sRepublicofC

3、hinaABSTRACT:Thepulverizedcoalcombustioninbothairandoxy-fuelconditionsgenerallyexperiencessuccessivecoaldevolatilizationandcharcombustionprocesses.Theeffectsofthesetwoprocesseshaveimportantinfluenceontheemissioncharacteristicsofparticulatematter.Withsome

4、differentcharacteristicsoflignitefromthehigherrankcoal,includingthehighcontentsoforganicallyboundcationsandtheapparentchar−CO2gasificationreactionuponoxy-fuelcombustion,theeffectsofbothcoaldevolatilizationandcharcombustionprocessesontheemissioncharacteris

5、ticsofparticulatematterduringoxy-fuelcombustionoflignitewouldaccordinglybedistinctive.AtypicalChineselignitewasdevolatilizedinaN2orCO2atmospheretogenerateN2−charandCO2−char,respectively.Rawcoalandthetwocharswereburnedinadrop-tubefurnaceunderbothairando

6、xy-fuelconditions.Afterward,theyieldsandinorganiccompositionsofsegregatedPM10werecarefullyanalyzed.TheresultshaveshownthatthedevolatilizationintheN2conditionpromotestheemissionofsub-micrometerparticles(PM0.5)andcoarseparticles(PM1−10)butthedevolatiliza

7、tionprocessinCO2inhibitstheiremission.N2−charandCO2−charpresententirelydifferentcombustionbehaviorand,thus,reflectthediscrepantemissioncharacteristicsofPM10.TheroughhigheryieldsofPM0.5andPM1−10fromN2−charcombustioncomparedtorawcoalcombustionmaybedrivenby

8、thehigherparticlecombustionrateand/ortemperatureofN2−char.Furthermore,thequiteseveregasificationreactionofCO2withcharduringcharpreparationresultsinaninhibitedcombustionrateofCO2−char,whichcanexplainthecaseinwhichmuchlessPM0.5andPM1−10are