Shock tube ignition delay times and methane time-histories measurements during excess CO2 diluted oxy-methane combustion

Koroglu, Batikan; Pryor, Owen M.; Lopez, Joseph; Nash, Leigh; Vasu, Subith S.

doi:10.1016/j.combustflame.2015.11.011

Shock tube ignition delay times and methane time-histories measurements during excess CO₂ diluted oxy-methane combustion

Journal Article · Fri Dec 04 00:00:00 EST 2015 · Combustion and Flame

DOI:https://doi.org/10.1016/j.combustflame.2015.11.011· OSTI ID:1329522

Koroglu, Batikan ^[1]; Pryor, Owen M. ^[2]; Lopez, Joseph ^[2]; Nash, Leigh ^[2]; Vasu, Subith S. ^[2]

Univ. of Central Florida, Orlando, FL (United States). Center for Advanced Turbomachinery and Energy Research; University of Central Florida
Univ. of Central Florida, Orlando, FL (United States). Center for Advanced Turbomachinery and Energy Research

The combustion of methane in air results in large amounts of CO₂ and NO_X emissions. In order to reduce the NO_X emissions, one possible solution is the oxy-methane combustion with large CO₂ dilution so that the combustion products can be reduced mainly to CO₂ and H₂O. However, there are very few studies on the chemical kinetics of oxy-methane combustion in a CO₂ diluted environment. In this study, methane time-histories, CH* emission profiles, and pressure time-histories measurements were conducted behind reflected shock waves to gain insight into the effects of CO₂ dilution of the gas mixtures on the ignition of methane. The measurements were carried out for mixtures of CH₄, CO₂ and O₂ in argon bath gas at temperatures of 1577–2144 K, pressures of 0.53–4.4 atm, equivalence ratios (Φ) of 0.5, 1, and 2, and CO₂ mole fractions (X_CO2) of 0, 30, and 60%. The laser absorption measurements were conducted using a continuous wave distributed feedback interband cascade laser (DFB ICL) centered at 3403.4 nm. The results showed the decrease of activation energy and the increase of ignition delay time as the amount of CO₂ dilution was increased. However, the changes were minor and within the experimental uncertainties of the measurements. Also, the results were compared to the predictions of two different natural gas mechanisms: GRI 3.0 and AramcoMech 1.3 mechanisms. In general the predictions were reasonable when compared to the experimental data; however, there were discrepancies at some conditions. Three different influences of CO₂ addition to the argon bath gas in regards to chemistry, collision efficiencies, and heat capacities were examined. In addition, the present study included experimentally obtained correlations for absorption cross sections of methane for its P(8) line in the v3 band in argon bath gas with and without carbon-dioxide dilutions at temperatures between 1200 < T < 2000 K and pressures between 0.7 < P < 1.2 atm.

View Accepted Manuscript (DOE)

Research Organization:: Univ. of Central Florida, Orlando, FL (United States)

Sponsoring Organization:: USDOE; USDOE Office of Fossil Energy (FE)

Grant/Contract Number:: FE0025260

OSTI ID:: 1329522

Alternate ID(s):: OSTI ID: 1249640

Journal Information:: Combustion and Flame, Journal Name: Combustion and Flame Journal Issue: C Vol. 164; ISSN 0010-2180

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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42 ENGINEERING
CH4 concentration
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oxy-Methane