Numerical analysis of the effect of acetylene and benzene addition to low-pressure benzene-rich flat flames on polycyclic aromatic hydrocarbon formation

Nilson Kunioshi, Seisaku Komori, Seishiro Fukutani

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

A modification of the CHEMKIN II package has been proposed for modeling addition of an arbitrary species at an arbitrary temperature to an arbitrary distance from the burner along a flat flame. The modified program was applied to the problem of addition of acetylene or benzene to different positions of a 40-Torr, φ{symbol} = 2.4 benzene/O2/40%-N2 premixed flame to reach final equivalence ratios of φ{symbol} = 2.5 and 2.681. The results obtained showed that acetylene addition to early positions of the flame led to significant increase in pyrene production rates, but pyrene concentrations were lower in the flames with acetylene addition in both the φ{symbol} = 2.5 and 2.681 cases. Addition of benzene to the flame did not alter pyrene production rates in either the φ{symbol} = 2.5 or 2.681 cases; however, for φ{symbol} = 2.5, pyrene concentrations increased with benzene addition, while for φ{symbol} = 2.681, pyrene contents decreased in comparison to the correspondent flames with no addition. Acetylene addition led to a significant increase in pyrene production rates, but the pyrene levels dropped due to increase in the flow velocity. Pyrene production rates were not sensitive to benzene addition, but pyrene contents increased with benzene addition when the flow velocity decreased. These results show that PAH concentration changes accompanying species addition to flames should be interpreted carefully, because an increase or decrease in the content of a PAH species does not necessarily reflect an effect on its formation rate or mechanism.

Original languageEnglish
Pages (from-to)1-10
Number of pages10
JournalCombustion and Flame
Volume147
Issue number1-2
DOIs
Publication statusPublished - 2006 Oct
Externally publishedYes

Fingerprint

Acetylene
Polycyclic Aromatic Hydrocarbons
Pyrene
polycyclic aromatic hydrocarbons
Polycyclic aromatic hydrocarbons
Benzene
acetylene
numerical analysis
pyrenes
Numerical analysis
flames
low pressure
benzene
Flow velocity
pyrene
flow velocity
Fuel burners
premixed flames
burners
equivalence

Keywords

  • Aromatic hydrocarbon formation
  • Benzene-rich flame
  • Flat flame program code
  • Low-pressure premixed flame
  • Species addition modeling

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Fuel Technology
  • Mechanical Engineering

Cite this

Numerical analysis of the effect of acetylene and benzene addition to low-pressure benzene-rich flat flames on polycyclic aromatic hydrocarbon formation. / Kunioshi, Nilson; Komori, Seisaku; Fukutani, Seishiro.

In: Combustion and Flame, Vol. 147, No. 1-2, 10.2006, p. 1-10.

Research output: Contribution to journalArticle

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