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Research Papers: Gas Turbines: Coal, Biomass, and Alternative Fuels

A Detailed and Reduced Reaction Mechanism of Biomass-Based Syngas Fuels

[+] Author and Article Information
Marina Braun-Unkhoff

German Aerospace Center (DLR), Institute of Combustion Technology, Pfaffenwaldring 38-40, 70569 Stuttgart, Germanymarina.braun-unkhoff@dlr.de

Nadezhda Slavinskaya, Manfred Aigner

German Aerospace Center (DLR), Institute of Combustion Technology, Pfaffenwaldring 38-40, 70569 Stuttgart, Germany

J. Eng. Gas Turbines Power 132(9), 091401 (Jun 10, 2010) (9 pages) doi:10.1115/1.4000589 History: Received April 16, 2009; Revised August 13, 2009; Published June 10, 2010; Online June 10, 2010

In the present work, the elaboration of a reduced kinetic reaction mechanism is described, which predicts reliably fundamental characteristic combustion properties of two biogenic gas mixtures consisting mainly of hydrogen, methane, and carbon monoxide, with small amounts of higher hydrocarbons (ethane and propane) in different proportions. From the in-house detailed chemical kinetic reaction mechanism with about 55 species and 460 reactions, a reduced kinetic reaction mechanism was constructed consisting of 27 species and 130 reactions. Their predictive capability concerning laminar flame speed (measured at T0=323K, 373 K, and 453 K, at p=1bar, 3 bars, and 6 bars for equivalence ratios φ between 0.6 and 2.2) and auto ignition data (measured in a shock tube between 1035 K and 1365 K at pressures around 16 bars for φ=0.5 and 1.0) are discussed in detail. Good agreement was found between experimental and calculated values within the investigated parameter range.

Copyright © 2010 by American Society of Mechanical Engineers
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Figures

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Figure 1

Comparison of calculated (curves) and measured ignition delay times (symbols (40)) for CH4/O2/N2 gas mixtures. Detailed reaction models: DLR_LS _full (solid curve); GRI 3.0 (dashed curve). (a) p=17 bars, φ=1.0; (b) p=40 bars, φ=1.3.

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Figure 4

Laminar flame speed of a biogenic gas mixture I at p=1 bar for three different temperatures at T0=323 K, 373 K, and 453 K. Symbols: experiment (15-16); curves: calculations.

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Figure 5

Laminar flame speed of a biogenic gas mixture II at T0=373 K for three pressures. Symbols: experiment (15-16); curves: calculations.

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Figure 6

Scheme of iterative procedures for the elimination of unimportant species and reactions

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Figure 7

Laminar flame speed of a biogenic gas mixture I at p=1 bar for three different temperatures: T0=323 K, 373 K, and 453 K. Symbols: experiment (16); curves: calculations.

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Figure 2

Comparison of calculated (curves) and measured ignition delay times (symbols (41)) for CO/H2/O2/N2 gas mixtures. Reaction models: DLR_LS _full (solid); GRI 3.0 (dashed). (a) 20% CO–80% H2, φ=0.5; (b) 60% CO–40% H2, φ=0.5.

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Figure 3

Laminar flame speed versus equivalence ratio of CH4/air flames for T0=298 K and p=1 bar and p=5 bars. Symbols: experimental data (22,42-44). Curves: simulations with detailed reaction models: DLR_LS (solid); GRI 3.0 (dashed).

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Figure 8

Laminar flame speed of a biogenic gas mixture I at p=3 bars for two different temperatures: T0=373 K and 453 K. Symbols: experiment (16); curves: calculations.

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Figure 9

Laminar flame speed of a biogenic gas mixture I at p=6 bars for two different temperatures: T0=373 K and 453 K. Symbols: experiment (16); curves: calculations.

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Figure 10

Laminar flame speed of a biogenic gas mixture II at p=1 bar for two different temperatures: T0=373 K and 453 K. Symbols: experiment (16); curves: calculations.

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Figure 11

Laminar flame speed of a biogenic gas mixture II at p=3 bars for two different temperatures: T0=373 K and 453 K. Symbols: experiment (16); curves: calculations.

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Figure 12

Laminar flame speed of a biogenic gas mixture II at p=6 bars for two different temperatures: T0=373 K and 453 K. Symbols: experiment (16); curves: calculations.

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Figure 13

Comparison of calculated (curves) and measured ignition delay times (symbols (16)) for synthetic gas mixture I. Reaction mechanisms: detailed (DLR_LS _full: solid); reduced (DLR_LS _red: dashed). (a) p=15.6–16.5 atm; φ=0.5; diluted with argon 1:2. (b) p about 16 atm; φ=0.5; diluted with argon 1:5.

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Figure 14

Comparison of calculated (curves) and measured ignition delay times (symbols (16)) for synthetic gas mixture I. Reaction mechanisms: detailed (DLR_LS _full: solid); reduced (DLR_LS _red: dashed). (a) p about 16 atm; φ=1.0; diluted with argon 1:5. (b) p about 15 atm; φ=1.0; diluted with argon 1:10.

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Figure 15

Comparison of calculated (curves) and measured ignition delay times (symbols (16)) for synthetic gas mixture II. Reaction mechanisms: detailed (DLR_LS _full: solid); reduced (DLR_LS _red: dashed). (a) diluted with argon 1:2; p about 16 atm; φ=0.5. (b) diluted with argon 1:5; p about 16 atm; φ=0.5. (c) diluted with argon 1:5; p about 16 atm; φ=1.0.

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