Experimental and modeling study of the effect of elevated pressure on lean high-hydrogen syngas flames

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Abstract

New laminar burning velocity measurements of 85:15% (by volume) H2–CO and H2–N2 mixtures with O2–He oxidizer are reported at lean conditions and elevated pressures (1–10 atm). Experiments are conducted using the heat flux method at initial temperature of 298 K. In this technique a near adiabatic flame is stabilized by balancing the heat loss from the flame to the burner with heat gain to the unburnt gas mixture such that no net heat loss to the burner is observed. A new facility was designed for such high pressure burner stabilized flame experiments. The results obtained are compared with five chemical kinetic schemes from literature for syngas mixtures at elevated pressures. Large differences are observed between the kinetic schemes and the experiments which can be attributed to certain key chemical reactions. A study of the kinetics is performed through reaction rate and sensitivity analysis which indicate that a high uncertainty still remains in important reactions that drive the production and consumption of species such as H, HO2 and OH. For lean mixtures the reaction H + O2(+M) = HO2(+M) contributes significantly to the deviation of models from the experiments. The present analysis in the lean mixture regime suggests the need for further studies in assessment and modification of rate constants for this reaction.

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synthesis gas
Hydrogen
flames
burners
Fuel burners
hydrogen
Heat losses
reaction kinetics
Experiments
heat
Kinetics
oxidizers
kinetics
sensitivity analysis
Carbon Monoxide
velocity measurement
Reaction kinetics
Gas mixtures
Velocity measurement
Sensitivity analysis

Cite this

@article{b313cf00da7147a087fa47ffb52ba9dd,
title = "Experimental and modeling study of the effect of elevated pressure on lean high-hydrogen syngas flames",
abstract = "New laminar burning velocity measurements of 85:15{\%} (by volume) H2–CO and H2–N2 mixtures with O2–He oxidizer are reported at lean conditions and elevated pressures (1–10 atm). Experiments are conducted using the heat flux method at initial temperature of 298 K. In this technique a near adiabatic flame is stabilized by balancing the heat loss from the flame to the burner with heat gain to the unburnt gas mixture such that no net heat loss to the burner is observed. A new facility was designed for such high pressure burner stabilized flame experiments. The results obtained are compared with five chemical kinetic schemes from literature for syngas mixtures at elevated pressures. Large differences are observed between the kinetic schemes and the experiments which can be attributed to certain key chemical reactions. A study of the kinetics is performed through reaction rate and sensitivity analysis which indicate that a high uncertainty still remains in important reactions that drive the production and consumption of species such as H, HO2 and OH. For lean mixtures the reaction H + O2(+M) = HO2(+M) contributes significantly to the deviation of models from the experiments. The present analysis in the lean mixture regime suggests the need for further studies in assessment and modification of rate constants for this reaction.",
author = "M. Goswami and {Griensven, van}, J.G.H. and R.J.M. Bastiaans and A.A. Konnov and {Goey, de}, L.P.H.",
year = "2015",
doi = "10.1016/j.proci.2014.05.057",
language = "English",
volume = "35",
pages = "655--662",
journal = "Proceedings of the Combustion Institute",
issn = "1540-7489",
publisher = "Elsevier",
number = "1",

}

Experimental and modeling study of the effect of elevated pressure on lean high-hydrogen syngas flames. / Goswami, M.; Griensven, van, J.G.H.; Bastiaans, R.J.M.; Konnov, A.A.; Goey, de, L.P.H.

In: Proceedings of the Combustion Institute, Vol. 35, No. 1, 2015, p. 655-662.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - Experimental and modeling study of the effect of elevated pressure on lean high-hydrogen syngas flames

AU - Goswami,M.

AU - Griensven, van,J.G.H.

AU - Bastiaans,R.J.M.

AU - Konnov,A.A.

AU - Goey, de,L.P.H.

PY - 2015

Y1 - 2015

N2 - New laminar burning velocity measurements of 85:15% (by volume) H2–CO and H2–N2 mixtures with O2–He oxidizer are reported at lean conditions and elevated pressures (1–10 atm). Experiments are conducted using the heat flux method at initial temperature of 298 K. In this technique a near adiabatic flame is stabilized by balancing the heat loss from the flame to the burner with heat gain to the unburnt gas mixture such that no net heat loss to the burner is observed. A new facility was designed for such high pressure burner stabilized flame experiments. The results obtained are compared with five chemical kinetic schemes from literature for syngas mixtures at elevated pressures. Large differences are observed between the kinetic schemes and the experiments which can be attributed to certain key chemical reactions. A study of the kinetics is performed through reaction rate and sensitivity analysis which indicate that a high uncertainty still remains in important reactions that drive the production and consumption of species such as H, HO2 and OH. For lean mixtures the reaction H + O2(+M) = HO2(+M) contributes significantly to the deviation of models from the experiments. The present analysis in the lean mixture regime suggests the need for further studies in assessment and modification of rate constants for this reaction.

AB - New laminar burning velocity measurements of 85:15% (by volume) H2–CO and H2–N2 mixtures with O2–He oxidizer are reported at lean conditions and elevated pressures (1–10 atm). Experiments are conducted using the heat flux method at initial temperature of 298 K. In this technique a near adiabatic flame is stabilized by balancing the heat loss from the flame to the burner with heat gain to the unburnt gas mixture such that no net heat loss to the burner is observed. A new facility was designed for such high pressure burner stabilized flame experiments. The results obtained are compared with five chemical kinetic schemes from literature for syngas mixtures at elevated pressures. Large differences are observed between the kinetic schemes and the experiments which can be attributed to certain key chemical reactions. A study of the kinetics is performed through reaction rate and sensitivity analysis which indicate that a high uncertainty still remains in important reactions that drive the production and consumption of species such as H, HO2 and OH. For lean mixtures the reaction H + O2(+M) = HO2(+M) contributes significantly to the deviation of models from the experiments. The present analysis in the lean mixture regime suggests the need for further studies in assessment and modification of rate constants for this reaction.

U2 - 10.1016/j.proci.2014.05.057

DO - 10.1016/j.proci.2014.05.057

M3 - Article

VL - 35

SP - 655

EP - 662

JO - Proceedings of the Combustion Institute

T2 - Proceedings of the Combustion Institute

JF - Proceedings of the Combustion Institute

SN - 1540-7489

IS - 1

ER -