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Toward Elimination of Soot Emissions from Jet Fuel Combustion
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DOI：10.1021/acs.est.3c01048.png)
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Abstract
En 中文
Soot from jet fuel combustion in aircraft engines contributestoglobal warming through the formation of contrail cirrus clouds thatmake up to 56% of the total radiative forcing from aviation. Here,the elimination of such emissions is explored through N-2 injection (containing 0-25 vol % O-2) at the exhaustof enclosed spray combustion of jet fuel that nicely emulates aircraftsoot emissions. It is shown that injecting N-2 containing5 vol % of O-2 enhances the formation of polyaromatic hydrocarbons(PAHs) that adsorb on the surface of soot. This increases soot numberdensity and volume fraction by 25 and 80%, respectively. However,further increasing the O-2 concentration to 20 or 25 vol% enhances oxidation and nearly eliminates soot emissions from jetfuel spray combustion, reducing the soot number density and volumefraction by 87.3 or 95.4 and 98.3 or 99.6%, respectively. So, a judiciousinjection of air just after the aircraft engine exhaust can drasticallyreduce soot emissions and halve the radiative forcing due to aviation,as shown by soot mobility, X-ray diffraction, Raman spectroscopy,nitrogen adsorption, microscopy, and thermogravimetric analysis (forthe organic to total carbon ratio) measurements. Injection of air at the exhaust of enclosedspray combustionof jet fuel nearly eliminates soot emissions and can be used to guidehalving the contribution of aviation to global warming.
Keywords:
jet fuel combustion
soot
oxidation
morphology
nanostructure
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11.3
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