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

Reduced Reaction Mechanisms for Methane and Syngas Combustion in Gas Turbines

[+] Author and Article Information
N. Slavinskaya, M. Braun-Unkhoff, P. Frank

DLR, Institute of Combustion Technology, Pfaffenwaldring 38-40, Stuttgart, Germany

J. Eng. Gas Turbines Power 130(2), 021504 (Jan 30, 2008) (6 pages) doi:10.1115/1.2719258 History: Received August 29, 2005; Revised January 15, 2007; Published January 30, 2008

Two reduced reaction mechanisms were established that predict reliably for pressures up to about 20bar the heat release for different syngas mixtures including initial concentrations of methane. The mechanisms were validated on the base of laminar flame speed data covering a wide range of preheat temperature, pressure, and fuel-air mixtures. Additionally, a global reduced mechanism for syngas, which comprises only two steps, was developed and validated, too. This global reduced and validated mechanism can be incorporated into CFD codes for modeling turbulent combustion in stationary gas turbines.

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Copyright © 2008 by American Society of Mechanical Engineers
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Figures

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Figure 2

Laminar flame speed of stoichiometric methane/air mixtures at T0=573K at p=1–10bar. Comparison between experiment (symbols (9)) and calculation (curves).

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Figure 1

Laminar flame speed of methane/air mixtures at atmospheric pressure and a preheat temperature T0=298K. Comparison between measurement (symbols) (7-8,10) and calculation (curves) with different reduced mechanisms (1-6) and full mechanism (GRI̱3.0 (13)).

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Figure 3

Laminar flame speed of methane/air and methane/oxygen/inert flames at elevated pressures for a preheat temperature T0=300K. Comparison between measurement (symbols) (11-12) and calculation (curves).

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Figure 4

(a) Strategy for reduction of a reaction mechanism. (b) Elimination of redundant species: sensitivity plot for an atmospheric methane/air flame; T0=298K, φ=1.

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Figure 5

Laminar flame speed of atmospheric methane/air flames for T0=298K. Comparison between measured (symbols) (7-10) and calculated (curves) values.

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Figure 6

Stoichiometric methane air flames at different pressures and preheat temperatures. Comparison between measurement (symbols) (9) and calculation (curves).

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Figure 7

Laminar flame speed of methane/air flames at elevated pressures at a preheat temperature T0=300K. Comparison between measured (symbols) (11-12) and calculated (curves) values.

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Figure 8

Laminar flame speed of atmospheric premixed carbon monoxide/methane air flames with different amounts of methane (XCO+XCH4=0.15) at T0=300K. Symbols: experiment (18), curves: calculations.

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Figure 9

Laminar flame speed of atmospheric premixed 50% CO/50% H2 air flames at T0=298K. Symbols: experiment (19); curves: calculations.

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Figure 10

Laminar flame speed of atmospheric premixed CO/air flames with different amounts of hydrogen at a preheat temperature T0=298K. Symbols: experiment (19-20); curves: calculations.

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Figure 11

Laminar flame speed of atmospheric premixed carbon monoxide/hydrogen air flames with different amounts of hydrogen (XCO+XH2=0.20) at T0=300K. Symbols: experiment (18); curves: calculations.

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Figure 12

Laminar flame speed of premixed syngas flames (0.37 CO, 0.35 H2, 0.25 CO2, 0.03 N2) at different pressures and air/fuel ratios for T0=573K. Symbols: experiment (21); curves: calculations with full (13) and reduced mechanism II (this work, Table 2).

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Figure 13

Laminar flame speed of premixed laminar syngas flames (0.28 H2, 0.296 CO, 0.20 CO2, 0.20 H2O, 0.024 N2) at atmospheric (A) and at elevated (B) pressures at T0=573K. Symbols: experiment (21); Curves: calculations with full (13), reduced mechanism II (this work, Table 2), and global reduced mechanism (this work, reactions I+II).

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