Abstract
The effects of the oxygen concentration on polycyclic aromatic hydrocarbons (PAHs) and soot formation in a methane air counterflow diffusion flame are investigated experimentally. The oxygen concentration in the oxidizer is varied in the range from 0.18 to 0.22 (mole). PAHs measurement is performed by a gas chromatograph mass spectrometer (GC/MS). It is found that PAHs concentrations in the flame increase along with the increase of the oxygen concentration. This result shows that the increase of the oxygen concentration will promote soot formation in diffusion flames. The responses of Xi/XC6H6, which is the mole fraction ratio of the species i to benzene, to the change of the oxygen concentration are also examined to elucidate PAHs formation mechanism. In the naphthalene (2 rings) formation process, H-abstraction-C2H2-addition (HACA) mechanism would be more dominant than Marinov's model, in which the combination of 5-membered ring radicals contributes to PAlls formation. On the other hand, in phenanthrene (3 rings) formation process, not only HACA mechanism, but also Marinov's model can be responsible for its formation.
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