The Effect of CO2 Dilution on the Laminar Burning Velocity of Premixed Methane/Air Flames

Chan, Yii Leng; Zhu, Mingming; Zhang, Zhezi; Liu, Pengfei; Zhang, Dongke

doi:10.1016/j.egypro.2015.07.621

Cited by 70 publications

(34 citation statements)

References 13 publications

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“…CO2 addition indicates more chemical effects than H2O [11,18]. The addition of CO2 in the upstream air raises heat capacity of mixture and decreases combustion rate, reaction kinetics, flame speed, and flame temperature by causing a reductive effect on mixture concentration [14]. H2O has the high heat holding capacity and drop the reaction temperature, burning velocity, and NO [5].…”

Section: Resultsmentioning

confidence: 99%

“…Giles et al found CO2 and H2O are more effective than N2 in reducing NO and the most effective is H2O diluent in airstream for counter-flow diffusion flames [13]. Chan et al determined CO2 dilution lower flame temperature and increases the specific heat of the premixed methane/air mixture [14]. Zhang et al concluded the increasing CO2 dilution reduces the temperature and NOx [15].…”

Section: Introductionmentioning

confidence: 99%

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The Effects of CO2, N2, and H2O Dilutions on NO Formation of Partially Premixed Synthesis Gas Combustion

Öztürk

2019

Cumhuriyet Science Journal

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One of the main methods to decrease NO emission during the combustion of gases is the use of diluents. This study is interested in the effects of CO2, N2, and H2O dilutions in the adiabatic, turbulent, partially premixed combustion of synthesis gas. The amounts of NO emissions are computationally determined. The results show that NO maximizes at 1.39 of equivalence ratio under humid burning air conditions. The best reductive effect on NO emissions indicates H2O dilution followed by CO2 and N2. The increase in the dilution rates gradationally reduces NO. The rising pressure enhances NO emissions with/without diluters. The increasing inlet air and premixed mixture temperatures raises NO.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The Effects of CO2, N2, and H2O Dilutions on NO Formation of Partially Premixed Synthesis Gas Combustion

Öztürk

2019

Cumhuriyet Science Journal

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“…Moreover, Chan et al (2015) and Hinton and Stone (2014) in different studies, have investigated the effect of CO 2 addition on methane/air mixtures flame propagations. Using a flat-flame burner (Chan et al, 2015) and a stainless steel spherical vessel with an internal diameter of 160 mm (Hinton and Stone, 2014), the experiments was conducted at various pressure (atmospheric to 18 bar), temperature (298 to 660 K) and equivalence ratio, ER, (0.7 to 1.4). Chan et al (2015) and Hinton and Stone (2014) used a concentration of 0 to 15 and 40 vol% CO 2 in the mixture.…”

mentioning

confidence: 99%

“…Using a flat-flame burner (Chan et al, 2015) and a stainless steel spherical vessel with an internal diameter of 160 mm (Hinton and Stone, 2014), the experiments was conducted at various pressure (atmospheric to 18 bar), temperature (298 to 660 K) and equivalence ratio, ER, (0.7 to 1.4). Chan et al (2015) and Hinton and Stone (2014) used a concentration of 0 to 15 and 40 vol% CO 2 in the mixture. These studies determine that the flame propagates slower with a higher amount of CO 2 present in the mixture.…”

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confidence: 99%

Numerical Simulation on the Effect of Concentration on Premixed Ch4/Co2/Air Explosion Characteristics

Khan¹,

Sulaiman²,

Izhab³

et al. 2019

JCEIB

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In this study, a numerical simulation on the premixed CH4/CO2/Air (methane/carbon dioxide/air) mixture explosion characteristics was conducted by using the Flame Acceleration Simulator (FLACs) software. The domain used in the 20 L spherical vessel with 0.808 m diameter. The effect of various equivalence ratios on the explosion characteristics such as the explosion pressure, Pex, maximum explosion overpressure, Pmax, the maximum rate of the pressure rise, (dP/dt)max and gas deflagration index, KG, were studied. For this purpose, the mixture concentrations range from equivalence ratio (ER) 0.8 to 1.5 (9.6 to 18% vol/vol) were considered. From this study, the explosion pressure, Pex, maximum explosion overpressure, Pmax, and the maximum rate of pressure rise, (dP/dt)max, at various ER was the maximum at a slightly rich concentration (ER=1.2). At lean and rich mixtures, the Pex, Pmax, (dP/dt)max and KG decreases. It can be said that, at ER=1.2, the role of thermal-diffusive instability and its effect on the flame speed during the pressure development process had causes the diffused methane, CH4, to react further into the flame front, which significantly increases the mixture mass burning rate and flame was also found to propagates the fastest at ER=1.2 due to the incompletecombustion process caused by the insufficient and excess CH4 present in the lean and rich mixtures. The CH4/CO2/air mixtures studied in this study were also found to have the highest level of hazard potential when exploded.

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“…According to the study of methane/air combustion with CO2, increasing CO2 concentration causes reduction of the temperature of the reactants, the net rate of reaction and the speed of the flame [41]. Chan et al [42] also reported that for laminar methane/air flames, increasing the CO2-dilution concentration decreases the flame speed accordingly, and CO2 absorbs heat from reactants species, reducing a tendency to attain the activation temperature. According to the work of Yang et al [43], CO2 has a stronger impact on the laminar flame speed and extinction limits than N2 diluted syngas flame and the thermal effects created by CO2-diluents dominate the decrease in the flame speed, while the chemical effects marginally cause a stronger influence than the thermal effect on the reduction of the flame extinction limits.…”

Section: Premixed Flames With Co 2 -Dilutionsmentioning

confidence: 99%

Propagation and Morphology of Premixed Flames in Obstructed Channels under Atmospheric and Supercritical Conditions

Adebiyi¹

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The understanding of the morphology and propagation of premixed flames in channels is vital for the design and development of efficient propulsion systems requiring high heat release, such as pulse-detonation engines, and for resolving accidental fire in industrial processes. In this dissertation, extensive computational simulations of premixed flames in channels with rectangular and cylindrical cross sections, with closely packed obstacles are carried out. The goal is to provide insights into flame propagation under various conditions, which would be invaluable to the development of next-generation energy and propulsion systems as well as fire safety of industrial processes.

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The Effect of CO2 Dilution on the Laminar Burning Velocity of Premixed Methane/Air Flames

Cited by 70 publications

References 13 publications

The Effects of CO2, N2, and H2O Dilutions on NO Formation of Partially Premixed Synthesis Gas Combustion

The Effects of CO2, N2, and H2O Dilutions on NO Formation of Partially Premixed Synthesis Gas Combustion

Numerical Simulation on the Effect of Concentration on Premixed Ch4/Co2/Air Explosion Characteristics

Propagation and Morphology of Premixed Flames in Obstructed Channels under Atmospheric and Supercritical Conditions

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