Combustion Chemistry of Unsaturated Hydrocarbons Mixed with NO x: A Review with a Focus on Their Interactions

Ruoyue Tang and Song Cheng ()
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Ruoyue Tang: Department of Mechanical Engineering, The Hong Kong Polytechnic University, Kowloon 999077, Hong Kong
Song Cheng: Department of Mechanical Engineering, The Hong Kong Polytechnic University, Kowloon 999077, Hong Kong

Energies, 2023, vol. 16, issue 13, 1-35

Abstract: Unsaturated hydrocarbons are major components of transportation fuels, combustion intermediates, and unburnt exhaust emissions. Conversely, NO x species are minor species present in the residual and exhaust gases of gasoline-fueled engines and gas turbines. Their co-existence in transportation engines is quite common, particularly with exhaust gas recirculation, which can greatly influence engine combustion characteristics. Therefore, this paper presents a review on the combustion chemistry of unsaturated hydrocarbons and NO x mixtures, with a focus on their chemical kinetic interactions. First, a comprehensive overview of fundamental combustion experiments is provided, covering mixtures of C 2 –C 5 unsaturated/oxygenated species (namely alkenes, alkynes, dienes, alcohols, ethers, ketones, and furans) and three major NO x species (namely NO, NO 2 , and N 2 O), as well as reactors including jet-stirred reactors, flow reactors, burners, shock tubes, and rapid compression machines. Then, two widely adopted nitrogen chemistry models are evaluated in conjunction with a core chemistry model (i.e., NUIGMech1.1) via detailed chemical kinetic modeling, and the model similarities and differences across broad temperature ranges are highlighted. Thereafter, the unique interconversions between the three major NO x species are presented. In particular, the controversy regarding the pathways governing NO and NO 2 conversion is discussed. Following this, the key direct interaction reactions between unsaturated species and NO x species are overviewed. Finally, the distinguishing features of the combustion chemistry for unsaturated hydrocarbon and NO x mixtures are summarized, and recommendations for future research on this topic are highlighted.

Keywords: combustion chemistry; unsaturated hydrocarbon/NO x mixture; fundamental combustion experiments; chemical kinetic modeling; interaction chemistry (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
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