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dc.contributor.authorZhou, Mengxiang
dc.contributor.authorYan, Fuwu
dc.contributor.authorMa, Liuhao
dc.contributor.authorJiang, Peng
dc.contributor.authorWang, Yu
dc.contributor.authorChung, Suk Ho
dc.date.accessioned2021-09-27T06:16:46Z
dc.date.available2021-09-27T06:16:46Z
dc.date.issued2021-09-17
dc.date.submitted2021-07-19
dc.identifier.citationZhou, M., Yan, F., Ma, L., Jiang, P., Wang, Y., & Ho Chung, S. (2022). Chemical speciation and soot measurements in laminar counterflow diffusion flames of ethylene and ammonia mixtures. Fuel, 308, 122003. doi:10.1016/j.fuel.2021.122003
dc.identifier.issn0016-2361
dc.identifier.doi10.1016/j.fuel.2021.122003
dc.identifier.urihttp://hdl.handle.net/10754/671945
dc.description.abstractAmmonia is considered as one of the most promising alternative fuels due to its carbon neutrality and the existing infrastructure for its mass production and delivery. However, burning neat ammonia has the issue of poor flame stability and high NOx emissions, making co-firing ammonia with conventional fuel a more feasible approach. The present work investigated the sooting characteristics of counterflow diffusion flames of ethylene/ammonia mixtures. Experimentally, soot volume fraction (SVF) and average soot particle diameter in the neat ethylene, ammonia- and nitrogen- doped flames were non-intrusively measured. Both SVF and average soot particles diameter were found to decrease with the addition of ammonia. Flame temperature were measured with tunable diode laser absorption spectroscopy and the results suggested that the inhibiting effect of ammonia on soot formation was chemical instead of thermal. For further kinetic insights, numerical simulation with newly-constructed reaction mechanisms were performed and the results were compared against chemical speciation data from gas chromatography (GC) measurements; the results showed that ammonia doping would lead to more significant reduction of benzene concentration than nitrogen doping. Kinetic pathways of the chemical suppressing effect of ammonia addition on soot and its precursor formation were then explained based on numerical results. The major contribution of the present work can be summarized in the following aspects: 1) New comprehensive experimental data on sooting characteristics, important intermediate species concentrations of diffusion counterflow flames of ethylene/ammonia mixtures were provided for model validation; 2) One coupled mechanism with detailed hydrocarbon-nitrogen interactions was established to predict PAHs formation and soot formation; 3) Detailed chemical kinetics insight of ammonia effect on soot formation was presented in the counterflow flame.
dc.description.sponsorshipThis work was supported by the National Natural Science Foundation of China (51976142) and the Foundation of Key Laboratory of Power Machinery and Engineering, Ministry of Education, P.R. China. Y.W. would like to acknowledge Dr. Peng Liu of KAUST and Dr. Yang Li of Northwestern Polytechnic University for informative discussions regarding ammonia chemistries.
dc.publisherElsevier BV
dc.relation.urlhttps://linkinghub.elsevier.com/retrieve/pii/S0016236121018792
dc.rightsNOTICE: this is the author’s version of a work that was accepted for publication in Fuel. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Fuel, [308, , (2021-09-17)] DOI: 10.1016/j.fuel.2021.122003 . © 2021. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
dc.titleChemical speciation and soot measurements in laminar counterflow diffusion flames of ethylene and ammonia mixtures
dc.typeArticle
dc.contributor.departmentCombustion and Laser Diagnostics Laboratory
dc.contributor.departmentMechanical Engineering Program
dc.contributor.departmentPhysical Science and Engineering (PSE) Division
dc.identifier.journalFuel
dc.rights.embargodate2023-09-17
dc.eprint.versionPost-print
dc.contributor.institutionLaboratory for Advanced Combustion, School of Automotive Engineering, Wuhan University of Technology, Wuhan 430070, PR China
dc.contributor.institutionKey Laboratory of Power Machinery and Engineering of Ministry of Education, Shanghai Jiao Tong University, Shanghai, 200240, PR China
dc.identifier.volume308
dc.identifier.pages122003
kaust.personChung, Suk Ho
dc.date.accepted2021-09-11
dc.identifier.eid2-s2.0-85114986874
refterms.dateFOA2021-09-27T10:55:25Z


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