Numerical study on the influence of hydrogen addition on soot formation in a laminar ethylene-air diffusion flame

Journal Article · Sat Apr 15 04:00:00 EDT 2006 · Combustion and Flame

DOI:https://doi.org/10.1016/j.combustflame.2005.10.016· OSTI ID:20727308

Guo, Hongsheng; Liu, Fengshan; Smallwood, Gregory J ^[1]; Guelder, OEmer L ^[2]

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1. Institute for Chemical Process and Environmental Technology, National Research Council of Canada, 1200 Montreal Road, Building M-9, Ottawa, Ontario (K1A 0R6 Canada)
2. Institute for Aerospace Studies, University of Toronto, 4925 Dufferin Street, Toronto, Ontario (M3H 5T6 Canada)

The influence of hydrogen addition to the fuel of an atmosphere pressure coflow laminar ethylene-air diffusion flame on soot formation was studied by numerical simulation. A detailed gas-phase reaction mechanism, which includes aromatic chemistry up to four rings, and complex thermal and transport properties were used. The fully coupled elliptic governing equations were solved. The interactions between soot and gas-phase chemistry were taken into account. Radiation heat transfer from CO{sub 2}, CO, H{sub 2}O, and soot was calculated using the discrete-ordinates method coupled to a statistical narrow-band-correlated K-based wide-band model. The predicted results were compared with the available experimental data and analyzed. It is indicated that the addition of hydrogen to the fuel in an ethylene-air diffusion flame suppresses soot formation through the effects of dilution and chemistry. This result is in agreement with available experiments. The simulations further suggest that the chemically inhibiting effect of hydrogen addition on soot formation is due to the decrease of hydrogen atom concentration in soot surface growth regions and higher concentration of molecular hydrogen in the lower flame region. (author)

• OSTI ID: 20727308
• Journal Information: Combustion and Flame, Journal Name: Combustion and Flame Journal Issue: 1-2 Vol. 145; ISSN CBFMAO; ISSN 0010-2180
• Country of Publication: United States
• Language: English

Related Subjects

03 NATURAL GAS
AIR
COMBUSTION
COMBUSTION KINETICS
COMPUTERIZED SIMULATION
DISCRETE ORDINATE METHOD
ETHYLENE
HYDROGEN
PRESSURE RANGE KILO PA
SOOT