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Effects of oxidizer composition on the structure of laminar coflow (CO-H₂)/(O₂/H₂O) diffusion flames

From National Research Council Canada

Alternative titleEffects of oxidizer composition on the structure of laminar coflow (CO-H2)/(O2/H2O) diffusion flames
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Affiliation
  1. National Research Council of Canada. Metrology Research Centre
FormatText, Article
Conference12th Asia-Pacific Conference on Combustion, ASPACC 2019, July 1-5, 2019, Fukuoka, Japan
Abstract
The structures of laminar coflow syngas diffusion flames burning in O₂/H₂O atmosphere were experimentally and numerically studied at 1 atm and inlet temperature of 400 K. The effects of oxidizer composition on the attachment and fuel pyrolysis inside the fuel tube were investigated by varying the O₂/H₂O molar ratio from 20/80 to 100/0. The flame attachment phenomenon was captured using a digital camera, and a 2D flame code was adopted to model the thermal and chemical structures of laminar coflow syngas flames using detailed kinetics mechanism. Results show that increasing the O₂/H₂O ratio has little influence on the flame attachment since the diffusions of both the fuel components and O₂ in the oxidizer were promoted. However, the temperature of the burner tip was significantly enhanced as O₂/H₂O ratio increases, and kinetics analysis shows that it is attributed to the promoted heat release rate of H + O₂(+M) = HO₂(+M). As the O₂/H₂O ratio increases, syngas pyrolysis inside the fuel tube is promoted, mainly through the H consumption reactions because of the enhanced back diffusion of H from the flame front into the burner.
Publication date
PublisherCombustion Institute
In
  • 12th Asia-Pacific Conference on Combustion, ASPACC 2019, 149702.
LanguageEnglish
Peer reviewedYes
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Record identifier900341ab-af06-4beb-8a5f-96808bb91fdc
Record created2021-03-02
Record modified2021-03-02
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