Burning Rates of Lignite Particles at Low Furnace Temperatures
作者:
ANDREJ MACEK,
S.RAO CHARAGUNDLA,
期刊:
Combustion Science and Technology
(Taylor Available online 1986)
卷期:
Volume 49,
issue 3-4
页码: 205-212
ISSN:0010-2202
年代: 1986
DOI:10.1080/00102208608923912
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
Experimental burning times of particles were obtained for a sample of a Type A lignite, screened between 88 and 105 im, in a laboratory furnace with essentially cold walls at a constant gas temperature of U50±20 K. The mass fraction of oxygen in the furnace, X,, ranged from about 0.20, below which no combustion was observed, to 0.46. Over most of this range, the combustion of particles was essentially complete. The measured burning times were short (30 to 50 msec) and are shown to be inversely proportional to the gas phase mass transfer rates, suggesting diffusion-controlled kinetics. There is only a narrow range, 0.20 < Xg< 0.23, in which the burning times were clearly higher, indicating an intermediate regime. It was also observed that, in this narrow range, the particles tended to extinguish before complete combustion. Thus, it appears that, as X, was progressively decreased, there was unusually rapid transition from the diffusion-controlled regime to extinction at relatively high values of X". It is reasonable to ascribe this behavior to unusually high heat losses in these low-temperature experiments.
点击下载:
PDF (122KB)
返 回