Effects of H 2 O and CO 2 diluted oxidizer on the structure and shape of laminar coflow syngas diffusion flames

Xu, Hui; Liu, Fengshan; Sun, Shaozeng; Zhao, Yijun; Meng, Shun; Tang, Wen

doi:10.1016/j.combustflame.2016.12.001

Cited by 92 publications

(31 citation statements)

References 35 publications

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“…This could be due to the fact that the flow regime of fuel stream which is laminar for our work, while it was turbulent in [19]. Further, in terms of the flame dimension and NOx emission, the results obtained in this work also have the same trend as reported in [21] and [24].…”

Section: Discussionsupporting

confidence: 71%

“…Diffusion flame characteristics of syngas were also investigated in the several other works as per the literatures [16], [17], [18], [19], [20], [21], [22], [23] and [24]. Burner configuration selected for this purpose was either counter-flow or co-flow.…”

Section: Introductionmentioning

confidence: 99%

“…Conversely, the concentration of H2O, CO2 and N2 in syngas fuel composition was found to reduce the flame temperature. The flame formulated by a co-flow burner is utilised in several practical combustion applications (such as those can be found in industrial furnace and cooking hob), and the flame of syngas/producer gas was studied at some extend by [19], [20], [21], [22], [23] and [24]. These studies particularly focused on the effects of each species in the fuel composition of syngas/producer gas in terms of the flame characteristics e.g.…”

Section: Introductionmentioning

confidence: 99%

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Effects of fuel compositions on the heat generation and emission of syngas/producer gas laminar diffusion flame

Piemsinlapakunchon

Paul

2019

International Journal of Hydrogen Energy

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Demand for the clean and sustainable energy encourages the research and development in the efficient production and utilisation of syngas for low-carbon power and heating/cooling applications. However, diversity in the chemical composition of syngas, resulting due to its flexible production process and feedstock, often poses a significant challenge for the design and operation of an effective combustion system. To address this, the research presented in this paper is particularly focused on an in-depth understanding of the heat generation and emission formation of syngas/producer gas flames with an effect of the fuel compositions. The heat generated by flame not only depends on the flame temperature but also on the chemistry heat release of fuel and flame dimension. The study reports that the syngas/producer gas with a low H2:CO maximises the heat generation, nevertheless the higher emission rate of CO2 is inevitable. The generated heat flux at H2:CO = 3:1, 1:1, and 1:3 is found to be 222, 432 and 538 Wm-2 respectively. At the same amount of heat generated, H2 concentration in fuel dominates the emission of NOx. The addition of CH4 into the syngas/producer gas with H2:CO = 1:1 also increases the heat generation significantly (e.g. 614 Wm-2 at 20%) while decreases the emission formation. In contrast, adding 20% CO2 and N2 to the syngas/producer gas composition reduces the heat generation from 432 Wm-2 to 364 and 290 Wm-2 , respectively. The role of CO2 on this aspect, which is weaker than N2, thus suggests CO2 is preferable than N2. Along with the study, the significant role of CO2 on the radiation of heat and the reduction of emission are examined.

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Section: Discussionsupporting

confidence: 71%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effects of fuel compositions on the heat generation and emission of syngas/producer gas laminar diffusion flame

Piemsinlapakunchon

Paul

2019

International Journal of Hydrogen Energy

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“…As a result, CO 2 capture becomes much more manageable and economical. Besides, the high heat capacity of H 2 O and CO 2 enables many favorable combustion properties, such as low flame temperature [7,8] and low NOx emissions [9]. To grasp the dilution mechanism of H 2 O and CO 2 , many efforts have been made.…”

Section: Introductionmentioning

confidence: 99%

“…e effectiveness of these diluents on NO emission reduction follows the order of CO 2 > H 2 O > N 2 . Xie et al [11] found that the elementary reaction corresponding to the peak ROP (rate of production) of OH in CO/H 2 /air mixture changes from OH + H 2 � H + H 2 O to HO 2 + H � OH + OH when CO 2 and H 2 O are added, and CO 2 has a more potent chemical effect than H 2 O. Xu et al [8] investigated the effects of H 2 O and CO 2 diluted oxidizer on the structure and shape of laminar co-flow syngas diffusion flames. ey found that the thermal and radiative effects of CO 2 decrease the centerline temperature to a much larger degree than those of H 2 O; thus, CO 2 reduces the centerline temperature more effectively than H 2 O.…”

Section: Introductionmentioning

confidence: 99%

A Detailed Numerical Study of NOx Kinetics in Counterflow Methane Diffusion Flames: Effects of Fuel-Side versus Oxidizer-Side Dilution

Liu

Wang

et al. 2021

Journal of Combustion

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Dilution combustion has been widely utilized due to various merits, such as enhanced efficiency, fewer pollutants emissions, and even a promising future in alleviating global warming. Diluents can be introduced through the oxidizer or fuel side to achieve the desired combustion properties, and H2O and CO2 are the most common ones. A comprehensive comparison between the different dilution methods still lacks understanding and optimizes the dilution combustion technologies. This study numerically compared the effects of H2O and CO2 dilution in the oxidizer or fuel stream on counterflow methane diffusion flames, emphasizing NO formation kinetics. Results showed that the impact of different radiation heat transfer models on NO emissions diminishes with increasing the dilution ratio. The calculations of radiation heat transfer were treated in three ways: radiation-neglected, optically thin, and using a nongrey radiation model. When keeping the oxygen content and methane fraction constant, CO2 dilution in the air-side has the most profound influence on NO reduction, and CO2 dilution in the fuel-side has the least. H2O dilution showed a medium impact with a larger degree on air-side than that on fuel-side. To gain a deeper understanding of this effect order, the contributions of different NO formation routes were quantified, and analyses were made based on the diluents’ chemical and thermal effects. It was found that the oxidizer-side dilution and fuel-side dilution affect the NO formation pathway similarly. Still, the influence of H2O dilution on the NO formation pathway differs from that of CO2 dilution.

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Effect of Addition of Carbon Monoxide and Hydrogen in Syngas Inverse Diffusion Flames

Ibrahim

Kumaran

Raghavan

2022

Recent Advances in Energy Technologies

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Effects of H 2 O and CO 2 diluted oxidizer on the structure and shape of laminar coflow syngas diffusion flames

Cited by 92 publications

References 35 publications

Effects of fuel compositions on the heat generation and emission of syngas/producer gas laminar diffusion flame

Effects of fuel compositions on the heat generation and emission of syngas/producer gas laminar diffusion flame

A Detailed Numerical Study of NOx Kinetics in Counterflow Methane Diffusion Flames: Effects of Fuel-Side versus Oxidizer-Side Dilution

Effect of Addition of Carbon Monoxide and Hydrogen in Syngas Inverse Diffusion Flames

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