Heterogeneous reaction characteristics and their effects on homogeneous combustion of methane/air mixture in micro channels I. Thermal analysis

doi:10.1016/j.fuel.2018.07.004

GIEC OpenIR

	Heterogeneous reaction characteristics and their effects on homogeneous combustion of methane/air mixture in micro channels I. Thermal analysis
	Wang, Yefeng 1; Yang, Weijuan 1; Zhou, Junhu 1; Yang, Haolin2 ; Yao, Yanyi 1; Cen, Kefa 1
	2018-12-15
发表期刊	FUEL
ISSN	0016-2361
卷号	234 页码:20-29
通讯作者	Yang, Weijuan(yangwj@zju.edu.cn)
摘要	Catalytic combustion of methane/air mixture in various channels was numerically investigated to illuminate the heat characteristics of heterogeneous reactions (HTRs) and their effects on homogeneous reactions (HRs). A two-dimensional (2D) simulation model of channels with a width (d) of 2.00-2.82 mm was employed, which included detailed gas-phase and surface reaction mechanisms. Further, the heat transfer mechanisms were elucidated. HRs always occupied the main part of over 80% of the total released heat in all the cases. HTR is relatively amplified in narrower channels, and S (the ratio of heat released by HTR to that of all reactions) rises by several percentage as d decreases (S = 17.61% when d = 2.10 mm), and it is more effective to use a catalyst in the microcombustor with a smaller gap size to enhance combustion reaction rate and stability. The onsite-S showed a trend of "stable-decrease-peak-rapid increase-slow increase" along x, corresponding to preheating, homogeneous ignition, heterogeneous ignition (conversion of CO to CO2 and H-2 to H2O), intensive HTR stage (consumption of O, H, and OH and production of H2O and H-2), and complete consumption of reactants in the gas phase. The analysis about the heat sources for homogeneous ignition shows that homogeneous ignition was dominated by the preheating heat from hot gas downstream, and affected by transverse preheating heat. As d decreased, the preheating heat obtained from the transverse preheating increased by several percentages, even reaching to a similar value to preheating heat from hot gas downstream when d = 2.10 mm. The heat released by weak HTR only takes a small part of preheating heat of inlet mixture and homogeneous ignition. After homogeneous ignition, HR promoted the HTR to the maximum. Generally, HTR would delay the homogeneous ignition, enlarge the flame thickness, increase the peak of flame temperature and the exit gas temperature, and improve the completeness of combustion.
关键词	Methane Hetero/homogeneous reaction Thermal analysis Catalytic combustion Heat
DOI	10.1016/j.fuel.2018.07.004
关键词[WOS]	HETERO-/HOMOGENEOUS COMBUSTION ; CATALYTIC COMBUSTION ; PREMIXED METHANE/AIR ; BURNING VELOCITY ; FLOW COMBUSTION ; HIGH-PRESSURE ; PLATINUM ; FLAME ; IGNITION ; HYDROGEN
收录类别	SCI
语种	英语
资助项目	National Natural Science Foundation of China[51336010]
WOS研究方向	Energy & Fuels ; Engineering
项目资助者	National Natural Science Foundation of China
WOS类目	Energy & Fuels ; Engineering, Chemical
WOS记录号	WOS:000445253100003
出版者	ELSEVIER SCI LTD
引用统计	被引频次：26[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.giec.ac.cn/handle/344007/23892
专题	中国科学院广州能源研究所
通讯作者	Yang, Weijuan
作者单位	1.Zhejiang Univ, State Key Lab Clean Energy Utilizat, Hangzhou 310027, Zhejiang, Peoples R China 2.Chinese Acad Sci, Guangzhou Inst Energy Convers, Guangzhou 510640, Guangdong, Peoples R China
推荐引用方式 GB/T 7714	Wang, Yefeng,Yang, Weijuan,Zhou, Junhu,et al. Heterogeneous reaction characteristics and their effects on homogeneous combustion of methane/air mixture in micro channels I. Thermal analysis[J]. FUEL,2018,234:20-29.
APA	Wang, Yefeng,Yang, Weijuan,Zhou, Junhu,Yang, Haolin,Yao, Yanyi,&Cen, Kefa.(2018).Heterogeneous reaction characteristics and their effects on homogeneous combustion of methane/air mixture in micro channels I. Thermal analysis.FUEL,234,20-29.
MLA	Wang, Yefeng,et al."Heterogeneous reaction characteristics and their effects on homogeneous combustion of methane/air mixture in micro channels I. Thermal analysis".FUEL 234(2018):20-29.