Laminar burning velocity of lean H2–CO mixtures at elevated pressure using the heat flux method

M. Goswami, R.J.M. Bastiaans, A. Konnov, L.P.H. Goey, de

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Abstract

Laminar burning velocity measurements of 50:50 and 85:15% (by volume) H2–CO mixtures with O2–N2 and O2–He oxidizers were performed at lean conditions (equivalence ratio from 0.5 to 1) and elevated pressures (1 atm–9 atm). The heat flux method (HFM) is employed for determining the laminar burning velocity of the fuel–oxidizer mixtures. HFM creates a one-dimensional adiabatic stretchless flame which is an important prerequisite in defining the laminar burning velocity. This technique is based on balancing the heat loss from the flame to the burner with heat gain to the unburnt gas mixture, in a very simple way, such that no net heat loss to the burner is obtained. Instabilities are observed in lean H2–CO flames with nitrogen as the bath gas for pressures above 4 atm. Stable flames are obtained with helium as the bath gas for the entire pressure range. With the aim to cater stringent conditions for combustion systems such as gas turbines, an updated H2–CO kinetic mechanism is proposed and validated against experimental results. The scheme was updated with recent rate constants proposed in literature to suit both atmospheric and elevated pressures. The proposed kinetic model agrees with new experimental results. At conditions of high pressure and lean combustion, reactions H + O2 = OH + O and H + O2 (+M) = H2 (+M) compete the most when compared to other reactions. Reaction H + HO2 = OH + OH contributes to OH production, however, less at high-pressure conditions. At higher CO concentrations and leaner mixtures an important role of reaction CO + OH = CO2 + H is observed in the oxidation of CO. Keywords : Syngas; Laminar burning velocity; Heat flux method; Elevated pressure
LanguageEnglish
Pages1485-1498
Number of pages14
JournalInternational Journal of Hydrogen Energy
Volume39
DOIs
StatePublished - 2014

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Heat flux
heat flux
flames
oxidizers
burners
Heat losses
Fuel burners
baths
heat
synthesis gas
gas turbines
kinetics
Kinetics
velocity measurement
gases
gas mixtures
equivalence
Gases
atmospheric pressure
Gas mixtures

Cite this

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title = "Laminar burning velocity of lean H2–CO mixtures at elevated pressure using the heat flux method",
abstract = "Laminar burning velocity measurements of 50:50 and 85:15{\%} (by volume) H2–CO mixtures with O2–N2 and O2–He oxidizers were performed at lean conditions (equivalence ratio from 0.5 to 1) and elevated pressures (1 atm–9 atm). The heat flux method (HFM) is employed for determining the laminar burning velocity of the fuel–oxidizer mixtures. HFM creates a one-dimensional adiabatic stretchless flame which is an important prerequisite in defining the laminar burning velocity. This technique is based on balancing the heat loss from the flame to the burner with heat gain to the unburnt gas mixture, in a very simple way, such that no net heat loss to the burner is obtained. Instabilities are observed in lean H2–CO flames with nitrogen as the bath gas for pressures above 4 atm. Stable flames are obtained with helium as the bath gas for the entire pressure range. With the aim to cater stringent conditions for combustion systems such as gas turbines, an updated H2–CO kinetic mechanism is proposed and validated against experimental results. The scheme was updated with recent rate constants proposed in literature to suit both atmospheric and elevated pressures. The proposed kinetic model agrees with new experimental results. At conditions of high pressure and lean combustion, reactions H + O2 = OH + O and H + O2 (+M) = H2 (+M) compete the most when compared to other reactions. Reaction H + HO2 = OH + OH contributes to OH production, however, less at high-pressure conditions. At higher CO concentrations and leaner mixtures an important role of reaction CO + OH = CO2 + H is observed in the oxidation of CO. Keywords : Syngas; Laminar burning velocity; Heat flux method; Elevated pressure",
author = "M. Goswami and R.J.M. Bastiaans and A. Konnov and {Goey, de}, L.P.H.",
year = "2014",
doi = "10.1016/j.ijhydene.2013.10.164",
language = "English",
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pages = "1485--1498",
journal = "International Journal of Hydrogen Energy",
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Laminar burning velocity of lean H2–CO mixtures at elevated pressure using the heat flux method. / Goswami, M.; Bastiaans, R.J.M.; Konnov, A.; Goey, de, L.P.H.

In: International Journal of Hydrogen Energy, Vol. 39, 2014, p. 1485-1498.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - Laminar burning velocity of lean H2–CO mixtures at elevated pressure using the heat flux method

AU - Goswami,M.

AU - Bastiaans,R.J.M.

AU - Konnov,A.

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

PY - 2014

Y1 - 2014

N2 - Laminar burning velocity measurements of 50:50 and 85:15% (by volume) H2–CO mixtures with O2–N2 and O2–He oxidizers were performed at lean conditions (equivalence ratio from 0.5 to 1) and elevated pressures (1 atm–9 atm). The heat flux method (HFM) is employed for determining the laminar burning velocity of the fuel–oxidizer mixtures. HFM creates a one-dimensional adiabatic stretchless flame which is an important prerequisite in defining the laminar burning velocity. This technique is based on balancing the heat loss from the flame to the burner with heat gain to the unburnt gas mixture, in a very simple way, such that no net heat loss to the burner is obtained. Instabilities are observed in lean H2–CO flames with nitrogen as the bath gas for pressures above 4 atm. Stable flames are obtained with helium as the bath gas for the entire pressure range. With the aim to cater stringent conditions for combustion systems such as gas turbines, an updated H2–CO kinetic mechanism is proposed and validated against experimental results. The scheme was updated with recent rate constants proposed in literature to suit both atmospheric and elevated pressures. The proposed kinetic model agrees with new experimental results. At conditions of high pressure and lean combustion, reactions H + O2 = OH + O and H + O2 (+M) = H2 (+M) compete the most when compared to other reactions. Reaction H + HO2 = OH + OH contributes to OH production, however, less at high-pressure conditions. At higher CO concentrations and leaner mixtures an important role of reaction CO + OH = CO2 + H is observed in the oxidation of CO. Keywords : Syngas; Laminar burning velocity; Heat flux method; Elevated pressure

AB - Laminar burning velocity measurements of 50:50 and 85:15% (by volume) H2–CO mixtures with O2–N2 and O2–He oxidizers were performed at lean conditions (equivalence ratio from 0.5 to 1) and elevated pressures (1 atm–9 atm). The heat flux method (HFM) is employed for determining the laminar burning velocity of the fuel–oxidizer mixtures. HFM creates a one-dimensional adiabatic stretchless flame which is an important prerequisite in defining the laminar burning velocity. This technique is based on balancing the heat loss from the flame to the burner with heat gain to the unburnt gas mixture, in a very simple way, such that no net heat loss to the burner is obtained. Instabilities are observed in lean H2–CO flames with nitrogen as the bath gas for pressures above 4 atm. Stable flames are obtained with helium as the bath gas for the entire pressure range. With the aim to cater stringent conditions for combustion systems such as gas turbines, an updated H2–CO kinetic mechanism is proposed and validated against experimental results. The scheme was updated with recent rate constants proposed in literature to suit both atmospheric and elevated pressures. The proposed kinetic model agrees with new experimental results. At conditions of high pressure and lean combustion, reactions H + O2 = OH + O and H + O2 (+M) = H2 (+M) compete the most when compared to other reactions. Reaction H + HO2 = OH + OH contributes to OH production, however, less at high-pressure conditions. At higher CO concentrations and leaner mixtures an important role of reaction CO + OH = CO2 + H is observed in the oxidation of CO. Keywords : Syngas; Laminar burning velocity; Heat flux method; Elevated pressure

U2 - 10.1016/j.ijhydene.2013.10.164

DO - 10.1016/j.ijhydene.2013.10.164

M3 - Article

VL - 39

SP - 1485

EP - 1498

JO - International Journal of Hydrogen Energy

T2 - International Journal of Hydrogen Energy

JF - International Journal of Hydrogen Energy

SN - 0360-3199

ER -