Investigation of n-dodecane pyrolysis at various pressures and the development of a comprehensive combustion model

Meirong Zeng, Wenhao Yuan, Wei Li, Yan Zhang and Yizun Wang

Energy, 2018, vol. 155, issue C, 152-161

Abstract: n-Dodecane combustion was investigated experimentally and numerically in present study. Pyrolysis experiments of n-dodecane at pressures of 0.0066, 0.039, 0.197 and 1 atm, temperatures from 750 to 1430 K were studied in a flow reactor. Mole fractions of n-dodecane, argon and pyrolysis products (including active radicals) were evaluated. A kinetic model of n-dodecane was developed by validating both present and literature reported experiments. The rate of production analysis reveals H-abstraction and CC bond fission reactions are main consumption pathways of n-dodecane. The β-CC scission reactions of alkyls contribute to the formation of alkenes, which are mainly consumed via the allylic CC fission reactions. As a soot precursor, benzene is largely produced from the recombination of C3 species. Moreover, effects of carbon chain length on flow reactor pyrolysis were investigated for n-decane, n-dodecane and n-tetradecane. The decay of n-tetradecane is the fastest, followed by n-dodecane and n-decane, indicating that the pyrolysis reactivity of n-alkanes increases as the carbon chain length increases from C10 to C14n-alkanes. Ignition delay times and laminar burning velocities (LBVs) of n-alkanes under similar conditions were also compared, the result shows that effects of the carbon chain length on ignition delay times and LBVs are slight.

Keywords: n-Dodecane; Flow reactor pyrolysis; Kinetic model; Experimental validation; Soot precursors (search for similar items in EconPapers)
Date: 2018
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Citations: View citations in EconPapers (1)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:155:y:2018:i:c:p:152-161

DOI: 10.1016/j.energy.2018.04.177

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