Effects of O2 enrichment and CO2 dilution on laminar methane flames

Persis, S. de; Foucher, Fabrice; Pillier, Laure; Osorio, Vladimiro; Gökalp, İskender

doi:10.1016/j.energy.2013.04.041

Cited by 53 publications

(22 citation statements)

References 43 publications

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“…The use of high purity oxygen (O 2 ) is beneficial to reduce the cost of CO 2 capture in the flue gas because the high purity oxygen leads to highly concentrated CO 2 collection in complete combustion [5].…”

Section: Introductionmentioning

confidence: 99%

The effect of hydrogen addition on the flame behavior of a non-premixed oxy-methane jet in a lab-scale furnace

Noh

2013

Energy

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Section: Introductionmentioning

confidence: 99%

The effect of hydrogen addition on the flame behavior of a non-premixed oxy-methane jet in a lab-scale furnace

Noh

2013

Energy

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“…Comparisons between the flame speeds of nitrogen diluted mixtures to CO 2 mixtures have been studied [67][68][69][70]. It has been determined that the addition of CO 2 reduces the flame speeds compared to air.…”

Section: Introductionmentioning

confidence: 99%

Measurements and interpretation of shock tube ignition delay times in highly CO2 diluted mixtures using multiple diagnostics

Pryor

Barak

Köroğlu

et al. 2017

Combustion and Flame

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Common definitions for ignition delay time are often hard to determine due to the issue of bifurcation and other non-idealities that result from high levels of CO 2 addition. Using highspeed camera imagery in comparison with more standard methods (e.g., pressure, emission, and laser absorption spectroscopy) to measure the ignition delay time, the effect of bifurcation has been examined in this study. Experiments were performed at pressures between 0.6 and 1.2 atm for temperatures between 1650 and 2040 K. The equivalence ratio for all experiments was kept at a constant value of 1 with methane as the fuel. The CO 2 mole fraction was varied between a value of X CO2 = 0.00 to 0.895. The ignition delay time was determined from three different measurements at the sidewall: broadband chemiluminescent emission captured via a photodetector, CH 4 concentrations determined using a distributed feedback interband cascade laser centered at 3403.4 nm, and pressure recorded via a dynamic Kistler type transducer. All methods for the ignition delay time were compared to high-speed camera images taken of the axial cross-section during combustion. Methane time-histories and the methane decay times were also measured using the laser. It was determined that the flame could be correlated to the ignition delay time measured at the side wall but that the flame as captured by the camera was not homogeneous as assumed in typical shock tube experiments. The bifurcation of the shock wave resulted in smaller flames with large boundary layers and that the flame could be as small as 30% of the cross-sectional area of the shock tube at the highest levels of CO 2 dilution. Comparisons between the camera images and the different ignition delay time methods show that care must be taken in interpreting traditional ignition delay data for experiments with large

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“…Di Benedetto et al and Liu et al looked at the chemical effects (flammability and burning velocity) of methane combustion in CO 2 versus N 2 [4,5]. The laminar flame speeds have also been studied for various conditions [6][7][8][9]. In addition, Vasu et al examined the effect of CO 2 dilution on the ignition delay times of syngas mixtures of hydrogen and carbon monoxide [10].…”

mentioning

confidence: 99%

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

Köroğlu

Pryor

Lopez

et al. 2016

Combustion and Flame

127

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The combustion of methane in air results in large amounts of CO 2 and NO X emissions. In order to reduce the NO X emissions, one possible solution is the oxy-methane combustion with large CO 2 dilution so that the combustion products can be reduced mainly to CO 2 and H 2 O. However, there are very few studies on the chemical kinetics of oxy-methane combustion in a CO 2 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 CO 2 dilution of the gas mixtures on the ignition of methane. The measurements were carried out for mixtures of CH 4 , CO 2 and O 2 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 CO 2 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 CO 2 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 CO 2 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 v 3 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. 1. INTRODUCTION Energy consumption has increased dramatically as the world advances and becomes more industrialized. Over the next twenty five years, the U.S. Department of Energy expects the energy demand to increase by 29% with almost all of the new energy from natural gas [1]. A problem is that current methods for the combustion of natural gas (e.g., gas turbines) result in large amounts of CO 2 and NO X emissions. In order to reduce the greenhouse gases, one possible solution is the oxy-methane

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Effects of O2 enrichment and CO2 dilution on laminar methane flames

Cited by 53 publications

References 43 publications

The effect of hydrogen addition on the flame behavior of a non-premixed oxy-methane jet in a lab-scale furnace

The effect of hydrogen addition on the flame behavior of a non-premixed oxy-methane jet in a lab-scale furnace

Measurements and interpretation of shock tube ignition delay times in highly CO2 diluted mixtures using multiple diagnostics

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

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