NOx emission and thermal performances studies on premixed ammonia-oxygen combustion in a CO2-free micro-planar combustor

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dc.contributor.authorZhao D
dc.contributor.authorCai T
dc.contributor.authorWang B
dc.contributor.authorLi J
dc.contributor.authorGuan, Y
dc.date.accessioned2020-08-03T00:35:51Z
dc.date.available2020-08-03T00:35:51Z
dc.date.issued2020en
dc.date.updated2020-07-01T21:56:00Z
dc.description.abstractUnlike hydrocarbon fuel, ammonia is a carbon-free and renewable energy source. It is also regarded as one of the potential energy carriers. However, ammonia combustion for power generation is not well studied under micro-scale conditions, especially concerning nitrogen oxides (NOx) emission. For this, thermal performances and NO emission characteristics of premixed ammonia/oxygen combustion are numerically investigated on a micro-planar combustor. The effects of 1) the equivalence ratio ϕ, 2) inlet temperature Tin and 3) inlet pressure Pin are examined. The outer wall mean temperature (OWMT) is found to vary non-monotonically as the mixture varies from lean to rich conditions, with the peak occurring at ϕ = 0.9 mainly due to the optimal heat transfer performance. However, a low ϕ could lead to the high nitric oxides (NO) concentrations because of the high flame temperature as well as O atom concentrations. Up to 75.5% of NO reduction could be achieved, as ϕ is optimized. Furthermore, increasing Tin is shown to be associated with a low OWMT and NO concentration. In addition, varying Pin is shown to lead to not only OWMT being changed but also NO formation being mitigated. The decrease in NO concentration for high Pin is mostly attributable to the short residence time of high flame temperature in the channel and low OH concentrations. This work reveals that optimizing the operating thermodynamic parameters is an effective means to reduce NO emissions and improve thermal performances.en
dc.identifier.citationZhao D, Cai T, Wang B, Li J (2020). NOx emission and thermal performances studies on premixed ammonia-oxygen combustion in a CO2-free micro-planar combustor. Fuel: the science and technology of fuel and energy.en
dc.identifier.doihttp://doi.org/10.1016/j.fuel.2020.118554
dc.identifier.issn0016-2361
dc.identifier.urihttps://hdl.handle.net/10092/100842
dc.language.isoen
dc.rightsAll rights reserved unless otherwise stateden
dc.rights.urihttp://hdl.handle.net/10092/17651en
dc.subjectcarbon-free fuelen
dc.subjectNOx emissionen
dc.subjectammoniaen
dc.subjectthermodynamicsen
dc.subjectheat transferen
dc.subject.anzsrcFields of Research::40 - Engineering::4004 - Chemical engineering::400402 - Chemical and thermal processes in energy and combustionen
dc.titleNOx emission and thermal performances studies on premixed ammonia-oxygen combustion in a CO2-free micro-planar combustoren
dc.typeJournal Articleen
uc.collegeFaculty of Engineering
uc.departmentMechanical Engineering
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