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

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 p...

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Bibliographic Details
Published in:Combustion and flame 2006-04, Vol.145 (1), p.324-338
Main Authors: Guo, Hongsheng, Liu, Fengshan, Smallwood, Gregory J., Gülder, Ömer L.
Format: Article
Language:English
Subjects:
03 NATURAL GAS
AIR
Applied sciences
Carbon dioxide
Carbon monoxide
COMBUSTION
COMBUSTION KINETICS
Combustion. Flame
Computer simulation
COMPUTERIZED SIMULATION
Diffusion flames
DISCRETE ORDINATE METHOD
Energy
Energy. Thermal use of fuels
ETHYLENE
Exact sciences and technology
Fuels
HYDROGEN
Hydrogen addition
Laminar
Laminar flame
Mathematical models
PRESSURE RANGE KILO PA
Radiation
SOOT
Theoretical studies
Theoretical studies. Data and constants. Metering
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Summary: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 2, CO, H 2O, 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.
ISSN:0010-2180
1556-2921
DOI:10.1016/j.combustflame.2005.10.016