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dc.contributor.authorBohon, Myles
dc.contributor.authorRachidi, Mariam El
dc.contributor.authorSarathy, Mani
dc.contributor.authorRoberts, William L.
dc.date.accessioned2015-08-12T08:57:47Z
dc.date.available2015-08-12T08:57:47Z
dc.date.issued2015-06
dc.identifier.issn00102180
dc.identifier.doi10.1016/j.combustflame.2015.01.022
dc.identifier.urihttp://hdl.handle.net/10754/565977
dc.description.abstractThis work investigates the influence of molecular structure in hydroxylated fuels (i.e. fuels with one or more hydroxyl groups), such as alcohols and polyols, on NOx formation. The fuels studied are three lower alcohols (methanol, ethanol, and n-propanol), two diols (1,2-ethanediol and 1,2-propanediol), and one triol (1,2,3-propanetriol); all of which are liquids at room temperature and span a wide range of thermophysical properties. Experimental stack emissions measurements of NO/NO2, CO, and CO2 and flame temperature profiles utilizing a rake of thermocouples were obtained in globally lean, swirling, liquid atomized spray flames inside a refractory-lined combustion chamber as a function of the atomizing air flow rate and swirl number. These experiments show significantly lower NOx formation with increasing fuel oxygen content despite similarities in the flame temperature profiles. By controlling the temperature profiles, the contribution to NOx formation through the thermal mechanism were matched, and variations in the contribution through non-thermal NOx formation pathways are observed. Simulations in a perfectly stirred reactor, at conditions representative of those measured within the combustion region, were conducted as a function of temperature and equivalence ratio. The simulations employed a detailed high temperature chemical kinetic model for NOx formation from hydroxylated fuels developed based on recent alcohol combustion models and extended to include polyol combustion chemistry. These simulations provide a qualitative comparison to the range of temperatures and equivalence ratios observed in complex swirling flows and provide insight into the influence of variations in the fuel decomposition pathways on NOx formation. It is observed that increasing the fuel bound oxygen concentration ultimately reduces the formation of NOx by increasing the proportion of fuel oxidized through formaldehyde, as opposed to acetylene or acetaldehyde. The subsequent oxidation of formaldehyde contributes little to the formation of hydrocarbon (HC) radicals. Ultimately, by reducing the contributions to the HC radical pool, NOx can be effectively reduced in these fuels through suppression of non-thermal NOx formation pathways. © 2015 The Combustion Institute.
dc.publisherElsevier BV
dc.subjectAlcohol
dc.subjectHydroxylated
dc.subjectNOx
dc.subjectPrompt
dc.subjectSwirl
dc.subjectThermal
dc.titleExperiments and simulations of NOx formation in the combustion of hydroxylated fuels
dc.typeArticle
dc.contributor.departmentChemical Engineering Program
dc.contributor.departmentClean Combustion Research Center
dc.contributor.departmentCombustion and Pyrolysis Chemistry (CPC) Group
dc.contributor.departmentMechanical Engineering Program
dc.contributor.departmentPhysical Science and Engineering (PSE) Division
dc.contributor.departmenthigh-pressure combustion (HPC) Research Group
dc.identifier.journalCombustion and Flame
kaust.personSarathy, Mani
kaust.personRoberts, William L.
kaust.personBohon, Myles
kaust.personRachidi, Mariam El


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