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1、物理化學(xué)學(xué)報(bào)(WuliHuaxueXuebao)JanuaryActaPhys.鄄Chim.Sin.,2010,26(1)：23-2823[Article]www.whxb.pku.edu.cn二甲醚和乙醇低壓層流預(yù)混火焰的對(duì)比研究1,31,鄢11高健趙黛青汪小憨蔣利橋122楊浩林袁濤楊玖重(1中國科學(xué)院廣州能源研究所,廣州510640;2中國科學(xué)技術(shù)大學(xué)國家同步輻射實(shí)驗(yàn)室,合肥230029;3中國科學(xué)院研究生院,北京100049)摘要：利用分子束質(zhì)譜結(jié)合真空紫外同步輻射光電離技術(shù)對(duì)相同燃燒條件下的低壓層流預(yù)混二甲醚/氧氣
2、/氬氣和乙醇/氧氣/氬氣火焰進(jìn)行研究.通過測量光電離效率曲線,識(shí)別了二甲醚和乙醇火焰的中間物種,得到相應(yīng)的火焰質(zhì)譜;通過測量火焰中各物種在燃燒爐爐膛各位置的電離信號(hào)強(qiáng)度,得到了各物種的摩爾分?jǐn)?shù)分布曲線.結(jié)合兩種燃料分子不同的化學(xué)結(jié)構(gòu)及詳細(xì)的燃燒化學(xué)反應(yīng)機(jī)理,分析了兩火焰中間物種生成特性的異同.研究結(jié)果表明:甲醛為兩火焰中最主要的C1中間物種;二甲醚火焰趨向于生成C1中間物種,C2物種摩爾分?jǐn)?shù)較低;乙醇火焰中乙醛、乙烯、乙炔和乙烯酮等C2中間物種的摩爾分?jǐn)?shù)明顯高于二甲醚火焰中的值.關(guān)鍵詞：同步輻射;單光子電離;二甲醚;乙醇;
3、層流預(yù)混火焰中圖分類號(hào)：O643ComparativeStudyofDimethylEtherandEthanolPremixedLaminarFlamesatLowPressure1,31,鄢11GAOJianZHAODai鄄QingWANGXiao鄄HanJIANGLi鄄Qiao122YANGHao鄄LinYUANTaoYANGJiu鄄Zhong(1GuangzhouInstituteofEnergyConversion,ChineseAcademyofSciences,Guangzhou510640,P.R.Chin
4、a;2NationalSynchrotronRadiationLaboratory,UniversityofScienceandTechnologyofChina,Hefei230029,P.R.China;3GraduateUniversityofChineseAcademyofSciences,Beijing100049,P.R.China)Abstract：Lowpressurepremixedlaminardimethylether(DME)/oxygen/argonandethanol/oxygen/argonf
5、lames(equivalenceratio:1.0)werestudiedbymolecular鄄beamsamplingmassspectrometry(MBMS)combinedwiththetunablesynchrotronradiationphotoionizationtechnique.Combustionintermediateswereidentifiedbymeasuringphotoionizationefficiency(PIE)spectra,andthemolefractionprofileso
6、fthesespeciesatdifferentflamepositionswerepresented.Similaritiesanddifferencesofmainintermediateformationcharacteristicsbetweenthetwoflameswereanalyzedbasedonderivedreactionmechanisms.ExperimentalresultsshowthatbothflamescontainthesameintermediatessuchasCH3,CH4,C2
7、H2,C2H4,CH2O,CH3OH,CH2襒C襒O,CH3CHO,andCH2CHOH.IntheDMEflame,theconcentrationoftheC1speciesismuchhigherthanthatoftheC2species,i.e.,C1intermediatestendtoformratherthanC2intermediatesinaDMEflame.Inaddition,formaldehydeisthedominantC1speciesineachflame.Theconcentration
8、sofC2specieslikeethylene,acetaldehyde,acetylene,andketeneintheethanolflameareremarkablyhigherthanthatfoundintheDMEflame.KeyWords：Synchrotronradiation;Si
