{"title":"双层颗粒多孔介质中甲烷/空气燃烧动态特性的实验研究","authors":"Hui Wang, Ning Wang, Guangshun Wang, Xiangyu Wang, Xiang Liu, Yuxuan Zhu","doi":"10.1002/apj.3059","DOIUrl":null,"url":null,"abstract":"<p>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 <i>V</i><sub>in</sub> = 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/m<sup>3</sup>, respectively. Furthermore, the porous media combustion exhibits a pronounced re-ignition capacity. At higher equivalence ratios, longer interruptions of premixed gas are allowed.</p>","PeriodicalId":1,"journal":{"name":"Accounts of Chemical Research","volume":null,"pages":null},"PeriodicalIF":16.4000,"publicationDate":"2024-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Experimental investigation on dynamic characteristics of methane/air combustion in double-layer pellets porous media\",\"authors\":\"Hui Wang, Ning Wang, Guangshun Wang, Xiangyu Wang, Xiang Liu, Yuxuan Zhu\",\"doi\":\"10.1002/apj.3059\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p>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 <i>V</i><sub>in</sub> = 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/m<sup>3</sup>, respectively. Furthermore, the porous media combustion exhibits a pronounced re-ignition capacity. At higher equivalence ratios, longer interruptions of premixed gas are allowed.</p>\",\"PeriodicalId\":1,\"journal\":{\"name\":\"Accounts of Chemical Research\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":16.4000,\"publicationDate\":\"2024-04-01\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Accounts of Chemical Research\",\"FirstCategoryId\":\"5\",\"ListUrlMain\":\"https://onlinelibrary.wiley.com/doi/10.1002/apj.3059\",\"RegionNum\":1,\"RegionCategory\":\"化学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"CHEMISTRY, MULTIDISCIPLINARY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Accounts of Chemical Research","FirstCategoryId":"5","ListUrlMain":"https://onlinelibrary.wiley.com/doi/10.1002/apj.3059","RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"CHEMISTRY, MULTIDISCIPLINARY","Score":null,"Total":0}
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.
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.