Extinction characteristics of CH4/CO2 versus O2/CO2 counterflow non-premixed flames at elevated pressures up to 0.7 MPa

Maruta, Kaoru; Abe, Kazuki; Hasegawa, Susumu; Maruyama, Shigenao; Sato, Ju N.Ichi

doi:10.1016/j.proci.2006.08.013

Cited by 55 publications

(25 citation statements)

References 21 publications

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“…The mixing time is estimated based on the previous study [10]. For conventional oxy-fuel combustion of methane, the operating oxygen mole fraction is usually above 0.21 [8,[17][18][19], since it is difficult to establish the stable combustion owing to very low burning velocity [20] and also low flame temperature. In this study to their extinction limits, and hence, incomplete combustion may occur.…”

Section: Experimental and Numerical Methodsmentioning

confidence: 99%

“…Fuel-dilution has been employed in some researches; for instance, by combining oxy-fuel with fuel-dilution, Maruta et al [17] have investigated the extinction characteristics of counterflow non-premixed flames under various pressures; it is also found by Du and Axelbaum [22] that through separating a portion of N 2 from the air and redirecting to the fuel, which maintains the same heat release and flame temperature, soot formation is suppressed and the flame is strengthened.…”

Section: Case Ii: Ch 4 -Co 2 /O 2 -Comentioning

confidence: 99%

See 1 more Smart Citation

Carbon dioxide diluted methane/oxygen combustion in a rapidly mixed tubular flame burner

Shi

Ishizuka

2015

Combustion and Flame

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Section: Experimental and Numerical Methodsmentioning

confidence: 99%

Section: Case Ii: Ch 4 -Co 2 /O 2 -Comentioning

confidence: 99%

Carbon dioxide diluted methane/oxygen combustion in a rapidly mixed tubular flame burner

Shi

Ishizuka

2015

Combustion and Flame

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“…Converting methane into power source of small-scale practical applications without nitrogenoxides emissions, we shall obtain the knowledge on micro methaneoxygen flames. Oxy-fuel combustion has been investigated in detail to clarify the fundamental phenomena [1][2][3][4]. In addition, small-scale combustion has been treated to elucidate the characteristics of micro flames [5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Micro Methane-Oxygen Counterflow Diffusion Flames: Effects of Gravity on Flame Structures

Kadowaki

Hashimoto

Katsumi

et al. 2018

J. Phys.: Conf. Ser.

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We manipulated oxy-fuel combustion of methane in small scales to study the characteristics of micro counterflow diffusion flames under the gravity field. Methane-oxygen diffusion flames in counterflow burners were observed, where the burner distance was less than or equal to 1.0 mm and the apparent equivalence ratio was unity. The flame thickness and flame diameter were obtained as functions of the burner distance and gas flow rate. The minimum burner distance for the observation of flames became smaller as the gas flow rate increased. We obtained smaller values of the minimum burner distance when methane flowed out from the upper burner. The flame thickness and flame diameter decreased as the burner distance became smaller. In addition, the flame thickness and flame diameter had slightly larger values in the upper-methane case.

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“…Several researchers have studied oxygen combustion and clarified its fundamental phenomena (Maruta et al, 2007;Toftegaard et al, 2010;Sevault et al, 2012;Kobayashi et al, 2013;Bongartz and Ghoniem, 2015;Shimokuri et al, 2015). Research works on micro flames have revealed the essence of small-scale combustion (Miesse et al, 2005;Chen et al, 2007;Ju and Maruta, 2011;Hirasawa et al, 2013;Saiki and Suzuki, 2013;Nakamura et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Oxygen combustion of CH<sub>4</sub>-CO<sub>2</sub> mixture in a small-scale counterflow burner

Kadowaki

Kohatsu²,

Uehara³

et al. 2018

JTST

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Oxygen combustion of CH4-CO2 mixture in a small-scale counterflow burner was studied. A diffusion flame was stabilized in the gap between opposed ports ejecting fuel and oxygen gases, and its thickness which depended on the gap distance between burner ports, inner diameter of burner tubes, flow rate of gases and fuel gas component was measured. The gas flow rates were varied such that the apparent equivalence ratio became constant at unity, while the gap distance was varied in the range from 1 mm to less. It was shown that the flame thickness decreased monotonically as the gap distance decreased and that the diffusion flame became thinner when the methane concentration in fuel gas became lower. Increased flame thickness was observed at large gas flow rate, and a diffusion flame was found in smaller gap distance at larger inner diameter. From these data, the relation between the flame thickness and the flame stretch rate was summarized, showing that the flame thickness decreased as the flame stretch became stronger, i.e. the thickness varied inversely with the square root of stretch rate. To elucidate the dependence of the flame thickness on the flame stretch rate, the flame thickness normalized by the average velocity of oxygen gas and the inner diameter was introduced. It was confirmed that the normalized flame thickness depended only on the flame stretch rate.

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Extinction characteristics of CH4/CO2 versus O2/CO2 counterflow non-premixed flames at elevated pressures up to 0.7 MPa

Cited by 55 publications

References 21 publications

Carbon dioxide diluted methane/oxygen combustion in a rapidly mixed tubular flame burner

Carbon dioxide diluted methane/oxygen combustion in a rapidly mixed tubular flame burner

Micro Methane-Oxygen Counterflow Diffusion Flames: Effects of Gravity on Flame Structures

Oxygen combustion of CH<sub>4</sub>-CO<sub>2</sub> mixture in a small-scale counterflow burner

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