Autoignition in methanehydrogen mixtures

Cheng, R.K.; Oppenheim, A. K.

doi:10.1016/0010-2180(84)90088-9

Cited by 147 publications

(79 citation statements)

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“…The activation energies derived from eq. (1) proposed by Cheng and Oppenheim [13] for the same methane/hydrogen mixtures with hydrogen amountof-substance fractions of 0, 5%, 10%, and 20% were 53.4, 51.6, 49.8, and 46.2 kcal/mol, respectively. A comparison of the experimental and calculated activation energies reveals some differences.…”

Section: Results and Data Analysismentioning

confidence: 78%

“…The ignition delay time was measured under stoichiometric conditions at 1.5-7.0 MPa and 950-1060 K. Their results showed that the ignition delay times of the methane/hydrogen mixtures reduced as the hydrogen amount-of-substance fraction increased, and this effect was enhanced at higher temperatures and attenuated at higher pressures. Huang et al [12] also found the ignition promotion effect was reduced at lower temperatures in their study of the ignition delay time of methane/hydrogen/air mixtures in a shock tube setup using engine relevant conditions at 1.6-4.0 MPa and 1000-1300 K. Cheng and Oppenheimer [13] conducted experiments at 800-2000 K and 0.1-0.3 MPa, and correlated the ignition delay times of pure methane, pure hydrogen, and their mixtures according to the following empirical formula:…”

mentioning

confidence: 92%

“…Ignition delay times for mixtures with hydrogen amount-of-substance fractions <40% and an equivalence ratio >1 were not reported by Herzler and Naumann. To the best of our knowledge, only few studies on ignition delay for methane/hydrogen mixtures have been reported [10][11][12][13][14], and the models are not optimal for prediction of the ignition delay time. Ignition delay data for methane/hydrogen mixtures, and in particular methane rich mixtures, are very important for modification of the model of methane/hydrogen oxidation.…”

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confidence: 99%

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Experimental and kinetic study on ignition delay times of methane/hydrogen/oxygen/nitrogen mixtures by shock tube

et al. 2011

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Ignition delay times of methane/hydrogen/oxygen/nitrogen mixtures with hydrogen amount-of-substance fractions ranging from 0-20% were measured in a shock tube facility. The ambient temperature varied from 1422 to 1877 K and the pressure was maintained at 0.4 MPa behind the reflected shock wave. The experiments were conducted at an equivalence ratio of 2.0. The fuel mixtures were diluted with nitrogen gas so that the nitrogen amount-of-substance fraction was 95%. The experimental ignition delay time of the CH 4 /H 2 mixture decreased as the hydrogen amount-of-substance fraction increased. The enhancement of ignition by hydrogen addition was weak when the ambient temperature was >1750 K, and strong when the temperature was <1725 K. The ignition delay time of 20% H 2 /80% CH 4 was only one-third that of 100% CH 4 at 1500 K. A modified model based on GRI-Mech 3.0 was proposed and used to calculate the ignition delay times of test mixtures. The calculated results agreed with the experimental ignition delay times. Normalized sensitivity analysis showed that HO·+H 2 →H·+H 2 O was the main reaction for the formation of the H· at 1400 K. As the hydrogen amount-of-substance fraction increased, chain branching was enhanced through the reaction H·+O 2 →O·+HO·, and this reduced the ignition delay time. At 1800 K, the methyl radical (H 3 C·) became the key species that influenced the ignition of the CH 4 /H 2 /O 2 /N 2 mixtures, and sensitivity coefficients of the chain termination reaction 2H 3 C·(+M)→C 2 H 6 (+M), and chain propagation reaction HO 2 +H 3 C·→HO·+CH 3 O decreased, which reduced the influence of hydrogen addition on the ignition of the CH 4 /H 2 mixtures.shock tube, methane, hydrogen, chemical kinetics Citation:Zhang Y J, Huang Z H, Wei L J, et al. Experimental and kinetic study on ignition delay times of methane/hydrogen/oxygen/nitrogen mixtures by shock tube.

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Section: Results and Data Analysismentioning

confidence: 78%

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confidence: 92%

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confidence: 99%

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Experimental and kinetic study on ignition delay times of methane/hydrogen/oxygen/nitrogen mixtures by shock tube

et al. 2011

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“…In the strictest sense, the published mechanism was therefore not "comprehensive", a term originally applied by Westbrook and Dryer [3,4] to describe a mechanism developed by comparison against a number of different sources of kinetic data. These sources frequently include laminar flame speed measurements [5][6][7][8], shock tube ignition delay studies [9][10][11][12][13][14], and other sources such as static and stirred reactors. New flame speed experimental results using H 2 /O 2 /He mixtures at pressures ranging from 1 to 20 atm appear to be poorly predicted by the Mueller et al mechanism [7], while predictions of similar experiments using H 2 /O 2 mixtures in argon, helium and nitrogen at 1 to 3 atm pressure are quite reasonable [8].…”

Section: Introductionmentioning

confidence: 99%

An updated comprehensive kinetic model of hydrogen combustion

Zhao

Kazakov

et al. 2004

Int J of Chemical Kinetics

1,015

634

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ignition results. The reaction H+OH+M is found to be primarily significant only to laminar flame speed propagation predictions at high pressure. All experimental hydrogen flame speed observations can be adequately fit using any of the several transport coefficient estimates presently available in the literature for the hydrogen oxygen system simply by adjusting the rate parameters for this reaction within their present uncertainties.

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“…Ignition delay time of 80 msec was measured for conditions of φ = 0.3, 2,026 kPa (20 atm), and inlet temperature of 727 K (849 F) [9]. Ignition delay time is highly dependent upon the percentage of hydrogen in the fuel stock and inlet temperature [10]. Therefore, the ignition delay time for the HHF are expected to be much shorter than 80 msec.…”

Section: Figure 2: Conceptual Illustration Of Injector Layout For Sinmentioning

confidence: 99%

Conceptual Studies of a Fuel-Flexible Low-Swirl Combustion System for the Gas Turbine in Clean Coal Power Plants

Smith

Therkelsen

Littlejohn

et al. 2010

Volume 1: Aircraft Engine; Ceramics; Coal, Biomass and Alternative Fuels; Education; Electric Power; Manufacturing Materials An

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This paper reports the results of preliminary analyses that show the feasibility of developing a fuel flexible (natural gas, syngas and high-hydrogen fuel) combustion system for IGCC gas turbines. Of particular interest is the use of Lawrence Berkeley National Laboratory's DLN low swirl combustion technology as the basis for the IGCC turbine combustor. Conceptual designs of the combustion system and the requirements for the fuel handling and delivery circuits are discussed.The analyses show the feasibility of a multi-fuel, utilitysized, LSI-based, gas turbine engine. A conceptual design of the fuel injection system shows that dual parallel fuel circuits can provide range of gas turbine operation in a configuration consistent with low pollutant emissions. Additionally, several issues and challenges associated with the development of such a system, such as flashback and auto-ignition of the highhydrogen fuels, are outlined.

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Autoignition in methanehydrogen mixtures

Cited by 147 publications

References 13 publications

Experimental and kinetic study on ignition delay times of methane/hydrogen/oxygen/nitrogen mixtures by shock tube

Experimental and kinetic study on ignition delay times of methane/hydrogen/oxygen/nitrogen mixtures by shock tube

An updated comprehensive kinetic model of hydrogen combustion

Conceptual Studies of a Fuel-Flexible Low-Swirl Combustion System for the Gas Turbine in Clean Coal Power Plants

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