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Research Papers: Gas Turbines: Combustion, Fuels, and Emissions

Oxidation of Natural Gas, Natural Gas/Syngas Mixtures, and Effect of Burnt Gas Recirculation: Experimental and Detailed Kinetic Modeling

[+] Author and Article Information
T. Le Cong, G. Dayma

 Centre National de la Recherche Scientifique 1C, Avenue de la Recherche Scientifique, 45071 Orléans Cedex 2, France

P. Dagaut

 Centre National de la Recherche Scientifique 1C, Avenue de la Recherche Scientifique, 45071 Orléans Cedex 2, Francedagaut@cnrs-orleans.fr

J. Eng. Gas Turbines Power 130(4), 041502 (Apr 29, 2008) (10 pages) doi:10.1115/1.2901181 History: Received July 19, 2007; Revised July 31, 2007; Published April 29, 2008

The oxidation of methane-based fuels was studied experimentally in a fused-silica jet-stirred reactor (JSR) operating at 110atm, over the temperature range of 9001450K, from fuel-lean to fuel-rich conditions. Similar experiments were performed in the presence of carbon dioxide or syngas (COH2). A previously proposed kinetic reaction mechanism updated for modeling the oxidation of hydrogen, CO, methane, methanol, formaldehyde, and natural gas over a wide range of conditions including JSR, flame, shock tube, and plug flow reactor was used. A detailed chemical kinetic modeling of the present experiments was performed yielding a good agreement between the modeling, the present data and literature burning velocities, and ignition data. Reaction path analyses were used to delineate the important reactions influencing the kinetic of oxidation of the fuels in the presence of variable amounts of CO2. The kinetic reaction scheme proposed helps understand the effect of the additives on the oxidation of methane.

Copyright © 2008 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Schematic representation of the JSR setup used in this work

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Figure 2

The burning velocities of H2/Air at 1atm and 298K. The data (symbols: ◆ (12), ○ (13), + (14), × (15), ◻ (16), ▿ (17)) are compared to this modeling (line)

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Figure 3

The burning velocities of H2∕O2∕He(O2∕(O2+He)=0.08) at 10–20atm and 298K (data from Ref. 13)

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Figure 4

The burning velocities of H2/Air/diluent (N2 and CO2) at 1atm, 298K, and Φ=1.0 (data from Ref. 18)

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Figure 5

Oxidation of hydrogen in a “plug” flow reactor (1.3%H2+2.2%O2+N2 at 6.5atm). The experimental mole fractions of hydrogen (symbols) are compared to the modeling (lines). The data are from Ref. 19.

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Figure 6

The burning velocities of CO∕H2/air at 1atm and 298K. The data (symbols:● (20), ○ (21)) are compared to this modeling.

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Figure 7

The burning velocities of CO∕H2∕He at 5–10atm and 298K. The data were taken from Ref. 21.

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Figure 8

The burning velocities of hydrogen CO∕H2∕He at 10–20atm and 298K. The data are from Sun (21) and Burke (22).

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Figure 9

Effect of CO2 on the burning velocities of CO∕H295∕5 at 1atm and 298K. The data are from Ref. 23.

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Figure 10

The ignition of hydrogen-CO-air mixtures. Top: CO∕H220∕80, Φ=0.5, 1.05atm; Bottom: CO∕H290∕10, Φ=0.5, 1.13atm. The data are from Kalitan and Petersen (24).

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Figure 11

The oxidation of CO in a PFR at 1atm (0.92% CO, 0.32%O2, 0.59% H2O, N2 diluent). The data are from Yetter (25).

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Figure 12

The oxidation of a hydrogen-CO 50∕50 mixture in a JSR at 1atm and Φ=1 (6500ppm of CO, 6500ppm of H2, 120ms). The data are from Dagaut (26).

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Figure 13

The oxidation of hydrogen-CO–O2–Ar mixtures in a single pulse ST at high pressure. Comparison between data (closed symbols) and modeling (open symbols): B : 43atm, Φ=0.5 (data form Sivaramakrishnan (27)).

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Figure 14

The oxidation of hydrogen-CO–O2–Ar mixtures in a single pulse ST at high pressure. Comparison between data (closed symbols) and modeling (open symbols): 43atm, Φ=1 (data from Ref. 27).

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Figure 15

The laminar burning velocities of methane-air mixtures at 1atm and 298K. The present modeling (dashed line) is compared to data taken from Ref. 28-30 (symbols).

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Figure 16

The ignition of CH4–O2–N2 (5.25% CH4, 20.98% O2, 73.77% N2) at 0.5–0.9atm. The data are from Petersen (31).

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Figure 18

The ignition of CH4–O2-diluent (N2 or Ar) at 18 and 60atm. The data are from Petersen (32).

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Figure 28

The oxidation of methane-hydrogen in a JSR (10atm, τ=250ms, 0.8% CH4, 0.8% H2, φ=0.3, dilution by nitrogen). The data (large symbols) are compared to the modeling (lines and small symbols).

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Figure 24

The laminar burning velocities of methane-hydrogen (20%) mixtures at atmospheric pressure. The data (37-38) (symbols) are compared to the modeling (line).

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Figure 23

The oxidation of methane-hydrogen in a JSR with 20% CO2 (1atm, τ=120ms, 0.8% CH4, 0.8% H2, φ=0.3, dilution by nitrogen). The data (large symbols) are compared to the modeling (lines and small symbols).

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Figure 22

The oxidation of methane-hydrogen in a JSR (1atm, τ=120ms, 0.8% CH4, 0.8% H2, φ=0.3, dilution by nitrogen). The data (large symbols) are compared to the modeling (lines and small symbols).

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Figure 21

The laminar burning velocities of methane-oxygen premixed flames in the presence of CO2 (1atm, dilution ratio O2∕(O2+CO2)=R varied). The conditions were O, R=0.35; ◻, R=0.3155; ◇, R=0.29(33). The data (symbols) are compared to the present modeling (dashed lines) and using GRI-mech 3.0 (continuous line) (34).

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Figure 20

The oxidation of methane with CO2 in a JSR (1atm, τ=120ms, 1% CH4, 20% CO2, φ=0.3, dilution by nitrogen). The data (large symbols) are compared to the modeling (lines and small symbols).

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Figure 19

The oxidation of methane in a JSR (1atm, τ=120ms, 1% CH4, φ=0.3, dilution by nitrogen). The data (large symbols) are compared to the modeling (lines and small symbols).

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Figure 17

The ignition of CH4–O2–N2 (5% CH4, 20% O2, 75% N2) at 10atm and 16.7–22.5atm. The data are from Petersen

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Figure 25

The laminar burning velocities of φ=1 methane-hydrogen mixtures at atmospheric pressure. The data (37,39) (symbols) are compared to the modeling (line).

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Figure 26

Ignition delay of methane-hydrogen mixtures at 20–23atm. The data (31) (symbols) are compared to the modeling (lines).

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Figure 27

The oxidation of methane in a JSR (10atm, τ=250ms, 1% CH4, φ=0.3, dilution by nitrogen). The data (large symbols) are compared to the modeling (lines and small symbols).

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Figure 29

The oxidation of methane-hydrogen with 20% CO2 in a JSR (10atm, τ=250ms, 0.8% CH4, 0.8% H2, φ=0.3, dilution by nitrogen). The data (large symbols) are compared to the modeling (lines and small symbols).

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Figure 30

The oxidation of methane-H2–CO in a JSR (1atm, τ=120ms, 0.8% CH4, 0.4% H2, 0.4% CO, φ=0.3, dilution by nitrogen). The data (large symbols) are compared to the modeling (lines and small symbols).

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