Transcription of Combustion Fundamentals
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Combustion Fundamentals
2 CombustionFundamentalsTounderstandthefon nationofpollutantsincombustionsystems,we mustfirstunder-standthenatureofthefuelsb eingburned,thethennodynamicsofthecombust ionpro-cess, ,detonations, spectrumoffuelscurrentlyinwidespreaduse, thesimplestincompositionisnaturalgas,whi chconsistsprimarilyofmethanebutincludesa ,buttheyare,atleast, , ,whichconsistsofmeasurementsoftheelement alcompositionofthefuel,generallypresente dasmassfractionsofcarbon,hydrogen,sulfur ,oxygen,nitrogen,andash, "CH4C2H6C3 HshydrocarbonsCOH2H2SN2CO2(106Jm-3) "p,101kPa;T,25 "Sweetened,"H2S (106 Jkg-I)Kerosene( ) < < ,a measureoftheheatreleaseduringcompletecom bustion, ,physicalpropertiesthatinfluencethehandl inganduseofa ,thespecificgravityorAPIgravity,*viscosi ty(possiblyat severaltemperatures),flashpoint(ameasure ofthetemperatureatwhichthefuelissufficie ntlyvolatiletoignitereadily),anddistilla tionprofiles(fractionvaporizedasa functionoftemperature) ,coalsareclassifiedbyrank,a haveundergonerelativelylittlechange, , ,whichidentifiesthedegreeofcoalifactiono fa solidfuel( ).
Rarely is the molecular composition known since ... (H20)from the hydrogen, that is, for a hydrocarbon fuel with the general composition CnHm, Even in the idealized case ofcomplete combustion, the accounting ofall species present in combustion exhaust involves more than simply measuring the CO2 and H20. Since
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