Numerical Investigation on the Flame Structure and CO/NO Formations of the Laminar Premixed Biogas–Hydrogen Impinging Flame in the Wall Vicinity

The near-wall flame structure and pollutant emissions of the laminar premixed biogas-hydrogen impinging flame were simulated with a detailed chemical mechanism. The spatial distributions of the temperature, critical species, and pollutant emissions near the wall of the laminar premixed biogas–hydrog...

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Autores principales:	Zhilong Wei, Lei Wang, Hu Liu, Zihao Liu, Haisheng Zhen
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	near-wall flame structure CO and NO formations biogas–hydrogen blends impinging flame Technology T
Acceso en línea:	https://doaj.org/article/361d930ec5d84ff4aa044c9f0e18880d
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spelling	oai:doaj.org-article:361d930ec5d84ff4aa044c9f0e18880d2021-11-11T16:02:44ZNumerical Investigation on the Flame Structure and CO/NO Formations of the Laminar Premixed Biogas–Hydrogen Impinging Flame in the Wall Vicinity10.3390/en142173081996-1073https://doaj.org/article/361d930ec5d84ff4aa044c9f0e18880d2021-11-01T00:00:00Zhttps://www.mdpi.com/1996-1073/14/21/7308https://doaj.org/toc/1996-1073The near-wall flame structure and pollutant emissions of the laminar premixed biogas-hydrogen impinging flame were simulated with a detailed chemical mechanism. The spatial distributions of the temperature, critical species, and pollutant emissions near the wall of the laminar premixed biogas–hydrogen impinging flame were obtained and investigated quantitatively. The results show that the cold wall can influence the premixed combustion process in the flame front, which is close to the wall but does not touch the wall, and results in the obviously declined concentrations of OH, H, and O radicals in the premixed combustion zone. After flame quenching, a high CO concentration can be observed near the wall at equivalence ratios (<i>φ</i>) of both 0.8 and 1.2. Compared with that at <i>φ</i> = 1.0, more unburned fuel is allowed to pass through the quenching zone and generate CO after flame quenching near the wall thanks to the suppressed fuel consumption rate near the wall and the excess fuel in the unburned gases at <i>φ</i> = 0.8 and 1.2, respectively. By isolating the formation routes of NO production, it is found that the fast-rising trend of NO concentration near the wall in the post flame region at <i>φ</i> = 0.8 is attributed to the NO transportation from the NNH route primarily, while the prompt NO production accounts for more than 90% of NO generation in the wall vicinity at <i>φ</i> = 1.2. It is thus known that, thanks to the effectively increased surface-to-volume ratio, the premixed combustion process in the downsized chamber will be affected more easily by the amplified cooling effects of the cold wall, which will contribute to the declined combustion efficiency, increased CO emission, and improved prompt NO production.Zhilong WeiLei WangHu LiuZihao LiuHaisheng ZhenMDPI AGarticlenear-wall flame structureCO and NO formationsbiogas–hydrogen blendsimpinging flameTechnologyTENEnergies, Vol 14, Iss 7308, p 7308 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	near-wall flame structure CO and NO formations biogas–hydrogen blends impinging flame Technology T
spellingShingle	near-wall flame structure CO and NO formations biogas–hydrogen blends impinging flame Technology T Zhilong Wei Lei Wang Hu Liu Zihao Liu Haisheng Zhen Numerical Investigation on the Flame Structure and CO/NO Formations of the Laminar Premixed Biogas–Hydrogen Impinging Flame in the Wall Vicinity
description	The near-wall flame structure and pollutant emissions of the laminar premixed biogas-hydrogen impinging flame were simulated with a detailed chemical mechanism. The spatial distributions of the temperature, critical species, and pollutant emissions near the wall of the laminar premixed biogas–hydrogen impinging flame were obtained and investigated quantitatively. The results show that the cold wall can influence the premixed combustion process in the flame front, which is close to the wall but does not touch the wall, and results in the obviously declined concentrations of OH, H, and O radicals in the premixed combustion zone. After flame quenching, a high CO concentration can be observed near the wall at equivalence ratios (<i>φ</i>) of both 0.8 and 1.2. Compared with that at <i>φ</i> = 1.0, more unburned fuel is allowed to pass through the quenching zone and generate CO after flame quenching near the wall thanks to the suppressed fuel consumption rate near the wall and the excess fuel in the unburned gases at <i>φ</i> = 0.8 and 1.2, respectively. By isolating the formation routes of NO production, it is found that the fast-rising trend of NO concentration near the wall in the post flame region at <i>φ</i> = 0.8 is attributed to the NO transportation from the NNH route primarily, while the prompt NO production accounts for more than 90% of NO generation in the wall vicinity at <i>φ</i> = 1.2. It is thus known that, thanks to the effectively increased surface-to-volume ratio, the premixed combustion process in the downsized chamber will be affected more easily by the amplified cooling effects of the cold wall, which will contribute to the declined combustion efficiency, increased CO emission, and improved prompt NO production.
format	article
author	Zhilong Wei Lei Wang Hu Liu Zihao Liu Haisheng Zhen
author_facet	Zhilong Wei Lei Wang Hu Liu Zihao Liu Haisheng Zhen
author_sort	Zhilong Wei
title	Numerical Investigation on the Flame Structure and CO/NO Formations of the Laminar Premixed Biogas–Hydrogen Impinging Flame in the Wall Vicinity
title_short	Numerical Investigation on the Flame Structure and CO/NO Formations of the Laminar Premixed Biogas–Hydrogen Impinging Flame in the Wall Vicinity
title_full	Numerical Investigation on the Flame Structure and CO/NO Formations of the Laminar Premixed Biogas–Hydrogen Impinging Flame in the Wall Vicinity
title_fullStr	Numerical Investigation on the Flame Structure and CO/NO Formations of the Laminar Premixed Biogas–Hydrogen Impinging Flame in the Wall Vicinity
title_full_unstemmed	Numerical Investigation on the Flame Structure and CO/NO Formations of the Laminar Premixed Biogas–Hydrogen Impinging Flame in the Wall Vicinity
title_sort	numerical investigation on the flame structure and co/no formations of the laminar premixed biogas–hydrogen impinging flame in the wall vicinity
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/361d930ec5d84ff4aa044c9f0e18880d
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Numerical Investigation on the Flame Structure and CO/NO Formations of the Laminar Premixed Biogas–Hydrogen Impinging Flame in the Wall Vicinity

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