双层颗粒多孔介质中甲烷/空气燃烧动态特性的实验研究

IF 16.4 1区 化学 Q1 CHEMISTRY, MULTIDISCIPLINARY
Hui Wang, Ning Wang, Guangshun Wang, Xiangyu Wang, Xiang Liu, Yuxuan Zhu
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引用次数: 0

摘要

双层多孔介质燃烧器被认为是实现稳定贫燃烧的有效方法。为了在双层多孔介质燃烧器中快速实现稳定燃烧状态,本研究对甲烷/空气预混合燃烧在台式双层多孔介质燃烧器中从点火到稳定燃烧再到最终熄火的动态特性进行了研究。实验结果表明,调节当量比和入口速度可建立稳定的火焰前沿,φ = 0.75 和 Vin = 0.20 m/s 是合适的启动条件。燃烧波的平均传播速度沿轴向变化,大约在 -0.022 至 -0.078 mm/s 之间。此外,当当量比从 0.60 增加到 0.70 时,过渡到稳定燃烧状态的时间缩短了近 47.14%。在启动阶段,一氧化碳和氮氧化物的浓度有明显的波动,但在稳定燃烧状态下,这两种气体的排放量仍然很低,最大浓度分别为 37.5 和 40.2 mg/m3。此外,多孔介质燃烧还表现出明显的复燃能力。当量比越高,预混合气体的中断时间就越长。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Experimental investigation on dynamic characteristics of methane/air combustion in double-layer pellets porous media

The double-layer porous media burner is considered as an effective way to realize stable lean-burn. In order to quickly achieve a stable combustion state in a double-layer porous media burner, this work investigated the dynamic characteristics of methane/air premixed combustion in a bench-scale double-layer porous media burnspanning from ignition to stable combustion and ultimately flameout. The experimental results indicate that regulating the equivalence ratio and the inlet velocity enables the establishment of a stable flame front and the φ = 0.75 and the Vin = 0.20 m/s are the appropriate start-up conditions. The average propagation velocity of the combustion wave variation along the axial direction and ranged approximately from −0.022 to −0.078 mm/s. Moreover, the transition time to a stable combustion state is reduced by nearly 47.14% as the equivalence ratio increases from 0.60 to 0.70. During start-up stage, there are significant fluctuations in CO and NOx concentrations, but both emissions remain low during steady combustion state, with the maximum concentrations of 37.5 and 40.2 mg/m3, respectively. Furthermore, the porous media combustion exhibits a pronounced re-ignition capacity. At higher equivalence ratios, longer interruptions of premixed gas are allowed.

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来源期刊
Accounts of Chemical Research
Accounts of Chemical Research 化学-化学综合
CiteScore
31.40
自引率
1.10%
发文量
312
审稿时长
2 months
期刊介绍: Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.
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