Gas chromatographic analysis of the flame gas of an n-hexane pool flame.
A low-temp. gas chromatog. system was used to det. the time-averaged concns. of components of n-C6H14 (I) [110-54-3] pool flame. All components at a fixed point in the flame with a time-averaged concn. above 0.05 vol.-% can be recorded with a single measurement. Up to 18 gaseous components with a total concn. of above 99.5 vol.-% were detd. on the flame axes: H2, N2, O2, Ar, CO, CO2, H2O, CH4 [74-82-8], C2H2 [74-86-2], C2H4 [74-85-1], C2H6 [74-84-0], C6H6 [71-43-2], and other alkanes and alkenes up to C6H14. In the region of the flame neck between the pool rim and a height of 0.08 m, the largest amt. of I burns with a relatively thin flame sheet. The crack gases formed as a result of pyrolysis of the remaining part of I (CH4, C2H2, etc.) reach the max. concn. in a height of 0.04 m above the pool rim. A turbulent mass transport of all gaseous components and of soot in the region above the flame neck was shown as a result of the calcn. of the axial concns. by the use of a statistical Gaussian distribution model.
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