部分予混合化によるPAHs抑制メカニズムの検討(熱工学,内燃機関,動力など)

概要

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The depletion mechanism of polycyclic aromatic hydrocarbons (PAHs) in a partially-premixed methane-air counter flow flame is investigated. The oxygen added to fuel flow is varied in the range from 0.0% to 5.0%, corresponding equivalence ratio is from ∞ to 30, respectively. 1-D structures of PAHs and C3, C4 hydrocarbon species are analyzed by a gas chromatograph mass spectrometer (GC/MS). Numerical analysis (based on GRI-mech 3.0) for corresponding 1-D flames is performed to obtain detail flame structure up to C2 class of hydrocarbons. As partial premixing proceeded, most of PAHs except for cyclopentadiene (C_5H_6) in the flame are decreased, while C3, C4 species remains as nearly constant value. In order to elucidate major PAHs depletion pathways, possible mass production rate is calculated by using experimentally-measured PAHs concentrations and numerically-predicted radical concentration. It is indicated that benzene (C_6H_6) is oxidized mainly by O_2 and HO_2 and decreased as the partial premixing proceeded, then subsequent PAHs formation is decreased according to the benzene depletion. In addition, higher-class of PAHs could be decomposed by way of benzene and cyclopentadiene.
社団法人日本機械学会の論文
2006-12-25