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

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

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.

Suggested Citation

  • Zeng, Meirong & Yuan, Wenhao & Li, Wei & Zhang, Yan & Wang, Yizun, 2018. "Investigation of n-dodecane pyrolysis at various pressures and the development of a comprehensive combustion model," Energy, Elsevier, vol. 155(C), pages 152-161.
    • Handle: RePEc:eee:energy:v:155:y:2018:i:c:p:152-161
    DOI: 10.1016/j.energy.2018.04.177
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    References listed on IDEAS

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    1. Chen, Longfei & Ding, Shirun & Liu, Haoye & Lu, Yiji & Li, Yanfei & Roskilly, Anthony Paul, 2017. "Comparative study of combustion and emissions of kerosene (RP-3), kerosene-pentanol blends and diesel in a compression ignition engine," Applied Energy, Elsevier, vol. 203(C), pages 91-100.
    2. Liu, Xinlei & Wang, Hu & Wang, Xiaofeng & Zheng, Zunqing & Yao, Mingfa, 2017. "Experimental and modelling investigations of the diesel surrogate fuels in direct injection compression ignition combustion," Applied Energy, Elsevier, vol. 189(C), pages 187-200.
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    1. Li, Xin & Zhang, Silong & Ye, Mai & Qin, Jiang & Bao, Wen & Cui, Naigang & Liu, Xiaoyong & Zhou, Chaoying, 2020. "Effect of enhanced heat transfer structures on the chemical recuperation process of advanced aero-engine," Energy, Elsevier, vol. 211(C).

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