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Ignition delay times, laminar flame speeds, and mechanism validation for natural gas/hydrogen blends at elevated pressures
Donohoe, Nicola; Heufer, Alexander; Metcalfe, Wayne K.; Curran, Henry J.; Davis, Marissa L.; Mathieu, Olivier; Plichta, Drew; Morones, Anibal; Petersen, Eric L.; Güthe, Felix
New experimental ignition delay time data measured in both a shock tube and in a rapid compression machine were taken to determine the increase in reactivity due to the addition of hydrogen to mixtures of methane and natural gas. Test conditions were determined using a statistical design of experiments approach which allows the experimenter to probe a wide range of variable factors with a comparatively low number of experimental trials. Experiments were performed at 1, 10, and 30 atm in the temperature range 850-1800 K, at equivalence ratios of 0.3, 0.5, and 1.0 and with dilutions ranging from 72% to 90% by volume. Pure methane- and hydrogen-fueled mixtures were prepared in addition to two synthetic 'natural gas'-fueled mixtures comprising methane, ethane, propane, n-butane and n-pentane, one comprising 81.25/10/5/2.511.25% while the other consisted of 62.5/20/10/5/2.5% C-1/C-2/C-3/C-4/Cs components to encompass a wide range of possible natural gas compositions. A heated, constant-volume combustion vessel was also utilized to experimentally determine laminar flame speed for the same baseline range of fuels. In this test, a parametric sweep of equivalence ratio, 0.7-1.3, was conducted at each condition, and the hydrogen content was varied from 50% to 90% by volume. The initial temperature and pressure varied from 300 to 450 K and 1 to 5 atm, respectively. Flame speed experiments conducted above atmospheric pressure utilized a 1:6 oxygen-to-helium ratio to curb the hydrodynamic and thermal instabilities that arise when conducting laminar flame speed experiments. All experiments were simulated using a detailed chemical kinetic model. Overall good agreement is observed between the simulations and the experimental results. A discussion of the important reactions promoting and inhibiting reactivity is included. (C) 2013 The Combustion Institute. Published by Elsevier Inc. All rights reserved. This work was supported by Science Foundation Ireland under Grant No. [08/IN1./I2055]. We also acknowledge the support of Alstom Power Ltd. A. Morones was supported by CONANCYT of Mexico and CIDESI, and M. Davis was supported in part by a Graduate Diversity Fellowship from Texas A&M University.
Keyword(s): Hydrogen; Natural gas; Rapid compression machine; Shock tube; Flame speed; Chemistry; Methane air mixtures; Burning velocities; Hydrogen air; Shock waves; Fuel blends; Oxidation; Hydrocarbon; Autignition; Temperature
Publication Date:
2016
Type: Journal article
Peer-Reviewed: Yes
Language(s): English
Contributor(s): |~|
Institution: NUI Galway
Publisher(s): Elsevier
File Format(s): application/pdf
First Indexed: 2016-11-03 09:29:52 Last Updated: 2019-09-20 06:32:41