Flame characteristics in H2/CO synthetic gas diffusion flames diluted with CO2: Effects of radiative heat loss and mixture composition

Park, Jeong; Bae, Dae Seok; Seok, Min; Yun, Jin Han; Keel, Sang In; Cho, Han Chang; Kim, Tae Kwon; Ha, Ji Soo

doi:10.1016/j.ijhydene.2008.07.063

Cited by 61 publications

(19 citation statements)

References 18 publications

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“…In practice, industrial combustion systems should operate at low scalar dissipations for H 2 -lean syngas (about 5 s À1 ) and high scalar dissipations for H 2 -rich syngas (between 100 and 1000 s À1 ) in order to minimize NO emissions. These findings agree with trends reported in the literature [25].…”

Section: Effect Of Oxygen-enrichment On Flame Structure and No Emissionssupporting

confidence: 93%

“…This finding is concordant with the experimental observations of Wu et al [40]. Furthermore, the effect of oxygen increment on the fractional flame temperature is amplified by the increase of CO mole fraction in synthetic gas mixture as CO and CO 2 are very radiative species [25]. Fig.…”

Section: Effect Of Oxygen-enrichment On Flame Structure and No Emissionssupporting

confidence: 92%

“…The oxidation chemistries of CO and H 2 which are the dominant components of most syngas fuels are well represented in i n t e r n a t i o n a l j o u r n a l o f h y d r o g e n e n e r g y 4 0 ( 2 0 1 5 ) 2 8 9 0 e2 8 9 8 this mechanism. GRI 3.0 mechanism was used in many previous studies of syngas counter-flow flames (Park et al [25], Shih et al, [26]). Its accuracy was also assessed in the case of syngas in both air combustion and oxygen-enhanced combustion employing experimental data and predictions of existing syngas kinetics namely Davis et al [27] mechanism, San Diego (Petrova and Williams [28]) mechanism and (Mueller et al [29]) mechanism on laminar burning velocity where reasonable agreement was achieved (Yepes and Amell [13]; Som et al, [18]; Singh et al, [30]).…”

Section: Simulation Detailsmentioning

confidence: 99%

See 2 more Smart Citations

A numerical investigation of structure and emissions of oxygen-enriched syngas flame in counter-flow configuration

Safer

Tabet

Ouadha

et al. 2015

International Journal of Hydrogen Energy

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Section: Effect Of Oxygen-enrichment On Flame Structure and No Emissionssupporting

confidence: 93%

Section: Effect Of Oxygen-enrichment On Flame Structure and No Emissionssupporting

confidence: 92%

Section: Simulation Detailsmentioning

confidence: 99%

See 1 more Smart Citation

A numerical investigation of structure and emissions of oxygen-enriched syngas flame in counter-flow configuration

Safer

Tabet

Ouadha

et al. 2015

International Journal of Hydrogen Energy

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“…그들은 주로 대향류 화염에서 층류 화염 속도 의 스트레치 측정 [1], 점화 과정의 연구 [2], 그리고 몇 가지 근본적인 연소특성 [2]을 연구했다. 또한 합 성가스 확산 화염에서 CO2를 추가한 효과 [8]와 선호 확산 [9], 루이스 수에 대한 효과 [10] 같은 근본적인 문제에 대해 연구했다.…”

Section: 서 론unclassified

Effect of Chemical Interaction on Flame Extinction in Interacting H<sub>2</sub>-air and CO-air Premixed Flames

Jung¹,

Park²,

Kwon

et al. 2013

Journal of the Korean Society of Combustion

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Important role of chemical interaction in flame extinction was numerically investigated in downstream interaction among lean(rich) and lean(rich) premixed as well as partially premixed H2-air and CO-air flames. The strain rate varied from 30 to 5917 s -1 until interacting flame could not be sustained anymore. Flame stability diagrams mapping lower and upper limit fuel concentrations for flame extinction as a function of strain rate are presented. Highly stretched interacting flames were survived only within two islands in the flame stability map where partially premixed mixture consisted of rich H2-air flame, extremely lean CO-air flame, and a diffusion flame. Further increase in strain rate finally converges to two points. Appreciable amount of hydrogen in the side of lean H2-air flame also oxidized the CO penetrated from CO-air flame, and this reduced flame speed of the H2-air flame, leading to flame extinction. At extremely high strain rates, interacting flames were survived only by a partially premixed flame such that it consisted of a very rich H2-air flame, an extremely lean CO-air flame, and a diffusion flame. In such a situation, both the weaker H2-air and CO-air flames were parasite on the stronger diffusion flame such that it could lead to flame extinction in the situation of weakening the stronger diffusion flame. Particular concerns are focused on important role of chemical interaction in flame extinction was also discussed in detail.

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“…In this situation, much research efforts have been gone into grasping the fundamental combustion characteristics [1][2][3][4][5] and the reaction mechanisms [6,7]. Several fundamental issues in syngas diffusion flame have been also addressed: effects of added CO 2 as well as effects of preferential diffusion and Lewis number [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Flame extinction in interacting CO-air and syngas-air premixed flames

Park

Kwon

et al. 2015

J Mech Sci Technol

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Chemical interaction on flame extinction in downstream interaction of syngas-air and CO-air premixed flames was investigated. Flame stability diagrams mapping the extinction limits for various fuel concentrations as functions of the strain rate were developed for the downstream interactions between syngas-air and CO-air premixed flames. Of particular concern was the impact of the chemical interaction on the flame extinction characteristics. The results showed that the lean extinction boundary was precipitously slanted for extremely small amount of syngas, finally causing the extinction boundary to open up in further increase of strain rate. There existed a critical syngas concentration below which the flame could not be sustained and above which the extinction boundary was double-valued. On the upper branch, hydrogen was produced via the reaction steps CO + H + M → HCO + M and HCO + H → H 2 + CO near the highly rich CO-air premixed flame to participate in CO-oxidation. For highly stretched interacting flames, only a flammable island existed. The pure syngas-air diffusion flame was extinguished at a critical strain rate. Further increase of strain rate forced the flammable island to be shrunk and finally to be a point. For highly stretched interacting flames, a minimum CO concentration existed below which the flame could not be survived. In such flames, the diffusion flame can act as a parasite to the lean CO-air premixed flame through sharing hydrogen penetrated from the rich syngas-air premixed flame. Such chemical interactions were examined in detail to describe the flame extinction characteristics.

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Flame characteristics in H2/CO synthetic gas diffusion flames diluted with CO2: Effects of radiative heat loss and mixture composition

Cited by 61 publications

References 18 publications

A numerical investigation of structure and emissions of oxygen-enriched syngas flame in counter-flow configuration

A numerical investigation of structure and emissions of oxygen-enriched syngas flame in counter-flow configuration

Effect of Chemical Interaction on Flame Extinction in Interacting H<sub>2</sub>-air and CO-air Premixed Flames

Flame extinction in interacting CO-air and syngas-air premixed flames

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