Effect of solid material on the blow-off limit of CH 4 /air flames in a micro combustor with a plate flame holder and preheating channels

Wan, Jianlong; Fan, Aiwu

doi:10.1016/j.enconman.2015.06.010

Cited by 70 publications

(20 citation statements)

References 27 publications

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“…At present, various flame stabilization techniques in small-scale combustors have been developed, such as flame stabilization based on the reflow effect, catalytic combustion, excess enthalpy combustion, and other techniques. Recently, Fan 15,23 found that flame blow-off limit for very lean CH 4 /air mixtures was obviously extended in the micro-combustor with preheating channels. Similarly, benefitting from the recirculation zone arising from the swirling flow, meso-combustor with the vortox flow enlarges operating ranges of flame combustion.…”

Section: Discussionmentioning

confidence: 99%

“…Similar facilitative effect of heat recirculation on blow-out limit has also been reported. 15,23 3.2 | Combustion characteristics of meso-combustor with and without preheating channels…”

Section: Model Validationmentioning

confidence: 99%

“…It was demonstrated that more entropy generation was caused by a higher baffle. Recently, Fan 15,23 found that flame blow-off limit for very lean CH 4 /air mixtures was obviously extended in the micro-combustor with preheating channels. Further research demonstrated that solid material with high thermal conductivity and small emissivity was suggested to extend flame blow-off limit.…”

Section: Introductionmentioning

confidence: 99%

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Thermal management and catalytic combustion stability characteristics of premixed methane/air in heat recirculation meso-combustors

et al. 2017

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Summary In order to illuminate heat recirculation effect on catalytic combustion stability and further improve energy conversion efficiency in meso‐combustor, the catalytic combustion characteristics of the combustor with/without preheating channels are numerically studied at steady conditions. It is found that methane conversion rate and combustion efficiency increases by 2% to 3% and approximately 9% in the heat recirculation meso‐combustor, indicating that heat recirculation effect facilitates more complete combustion of methane and medium components. Preheating channels show positive effects on improving combustion stability in the heat recirculation meso‐combustor. On one hand, preheating channels facilitate heat recirculation effect, and heat recirculation rate exceeds 10% for all cases and reaches 31.8% with an inlet velocity of 0.5 m/s, leading to significant increment of methane‐specific enthalpy at the preheating channel outlet. On the other hand, Rh(s)/O(s) ratios of catalytic surface and catalytic surface temperature in main reaction zone are enlarged by the preheating channels, facilitating methane adsorption at catalytic surface. Specially, most of fuels are consumed in a shorter distance with higher methane conversion speed, which brings benefits to promote combustion efficiency and may be helpful to inhibit the combustion instability in heat recirculation meso‐combustors.

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Section: Discussionmentioning

confidence: 99%

“…Similar facilitative effect of heat recirculation on blow-out limit has also been reported. 15,23 3.2 | Combustion characteristics of meso-combustor with and without preheating channels…”

Section: Model Validationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Thermal management and catalytic combustion stability characteristics of premixed methane/air in heat recirculation meso-combustors

et al. 2017

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“…Motivated by the aforementioned works, we recently [19] developed a micro combustor with a central plate (acts as a flame holder) and two preheating channels. This configuration can make full advantages of both the flow recirculation effect and heat recirculation effect.…”

Section: Introductionmentioning

confidence: 99%

Effect of the length of a plate flame holder on flame blowout limit in a micro-combustor with preheating channels

Wan

Fan

Yao

2016

Combustion and Flame

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“…Given that the influential mechanism of hydrogen addition on methane catalytic combustiona tt he microscale still remains ambiguous,a na nalysis of the combustion characteristics was conductedand the effect of inlet velocity on catalytic methane/air combustionw ith the addition of hydrogen was investigated numerically with the aim of extending the extinctionl imit of hydrocarbon fuels and maintaining combustion with high efficiency and stability. [18,19] Thed ifferences in combustionb ehavior with the addition of hydrogen at various working parameters,s uch as extinction and ignition characteristics,m ethanec onversion (f CH 4 ), and methaner eaction rates,w ill be discussed and the effectiveness of the thermal and chemical effects of hydrogen additionw ill be shown herein.A nalysis of the underlying factors of hydrogen-assisted methanec atalytic combustion provides as trong foundation for optimization strategiesf or hydrocarbonc ombustion in micropower systems.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Inlet Velocity on CH₄ Catalytic Combustion Behavior with H₂ Addition in a Microchannel Combustor

Yan

Tang

et al. 2017

Energy Tech

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The characteristics of premixed methane/air combustion in a microchannel with a Pt catalyst were examined and the effect of inlet velocity on catalytic methane combustion with hydrogen addition was investigated numerically. It is shown that appropriate hydrogen addition can expand the extinction limits, particularly the upper extinction limit of the inlet velocity, and increase methane conversion at higher inlet velocities. However, it is proved that methane conversion at an equivalent ratio of 0.8 decreased with hydrogen addition when inlet velocity was lower than 0.36 m s−1. The heat released in the hydrogen–oxygen reaction increased the wall temperature, which resulted in the adsorption–desorption equilibrium of oxygen shifting towards desorption as Pt(s) coverage increased and O(s) coverage decreased. With the same amount of hydrogen added, the changes in wall temperature that reflected the thermal effects of hydrogen were more obvious at higher inlet velocities, which improved methane conversion. If the heat released by hydrogen was neglected, the competitive consumption of oxygen, which demonstrates the chemical effect of hydrogen, was more significant at lower inlet velocities, which inhibited methane conversion.

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Effect of solid material on the blow-off limit of CH 4 /air flames in a micro combustor with a plate flame holder and preheating channels

Cited by 70 publications

References 27 publications

Thermal management and catalytic combustion stability characteristics of premixed methane/air in heat recirculation meso-combustors

Thermal management and catalytic combustion stability characteristics of premixed methane/air in heat recirculation meso-combustors

Effect of the length of a plate flame holder on flame blowout limit in a micro-combustor with preheating channels

The Effect of Inlet Velocity on CH₄ Catalytic Combustion Behavior with H₂ Addition in a Microchannel Combustor

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Effect of solid material on the blow-off limit of CH 4 /air flames in a micro combustor with a plate flame holder and preheating channels

Cited by 70 publications

References 27 publications

Thermal management and catalytic combustion stability characteristics of premixed methane/air in heat recirculation meso-combustors

Thermal management and catalytic combustion stability characteristics of premixed methane/air in heat recirculation meso-combustors

Effect of the length of a plate flame holder on flame blowout limit in a micro-combustor with preheating channels

The Effect of Inlet Velocity on CH4 Catalytic Combustion Behavior with H2 Addition in a Microchannel Combustor

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The Effect of Inlet Velocity on CH₄ Catalytic Combustion Behavior with H₂ Addition in a Microchannel Combustor