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	Ignition of single coal particle in a hot furnace under normal- and micro-gravity condition
	Zhu, Mingming ; Zhang, Hai ; Tang, Gentu ; Liu, Qing ; Lu, Junfu ; Yue, Guangxi ; Wang, Shuangfeng ; Wan, Shixin
	2010-10-12 ; 2010-10-12
关键词	Ignition Single coal particle Microgravity Ignition temperature Buoyancy effect Thermodynamics Energy & Fuels Engineering, Chemical Engineering, Mechanical
中文摘要	An experimental study on ignition and combustion of single particles was conducted at normal gravity and microgravity (mu-g) for three high volatile coals with initial diameter of 1.5 and 2.0 mm, respectively. The non-intrusive twin-color pyrometry method was used to retrieve the surface temperature of the coal particle through processing the images taken by a color CCD camera. At the same time, a mathematical model considering thermal conduction inside the coal particle was developed to simulate the ignition process. Both experiments and modeling found that ignition Occurred homogeneously at the beginning and then heterogeneously for the testing coal particles burning at mu-g. Experimental results confirmed that ignition temperature decreased with increasing volatile content and increasing particle size. However, contradicted to previous Studies. this study found that for a given coal with certain particle size, ignition temperature was about 50-80 K lower at mu-g than that at 1-g. The model predictions agreed well with the p-g experimental data on ignition temperature. The criterion that the temperature gradient in the space away from the particle surface equaled to zero was validated to determine the commence of homogeneous ignition. Thermal conduction inside the particle could have a noticeable effect for determining the ignition temperature. With the consideration of thermal conduction, the critical size for the phase transient from homogeneous to heterogeneous is about 700 mu m at ambient temperature 1500 K and oxygen concentration 0.23. (C) 2009 The Combustion Institute. Published by Elsevier Inc. All rights reserved.
语种	英语 ; 英语
出版者	ELSEVIER SCIENCE INC ; NEW YORK ; 360 PARK AVE SOUTH, NEW YORK, NY 10010-1710 USA
内容类型	期刊论文
源URL	[http://hdl.handle.net/123456789/79946]
专题	清华大学
推荐引用方式 GB/T 7714	Zhu, Mingming,Zhang, Hai,Tang, Gentu,et al. Ignition of single coal particle in a hot furnace under normal- and micro-gravity condition[J],2010, 2010.
APA	Zhu, Mingming.,Zhang, Hai.,Tang, Gentu.,Liu, Qing.,Lu, Junfu.,...&Wan, Shixin.(2010).Ignition of single coal particle in a hot furnace under normal- and micro-gravity condition..
MLA	Zhu, Mingming,et al."Ignition of single coal particle in a hot furnace under normal- and micro-gravity condition".(2010).

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