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(fractio)
mate analysis, which identifies the degree of coalifaction of a solid fuel (Table 2.3). Coal samples that have been air dried are subjected to a number ofstandardized tests to determine the amount ofmoisture inherent to the coal structure, the quantity ofvolatile matter released by the coal upon heating to 1200 K for several minutes, and the mass
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